LargeSynopticSurveyTelescop
    DataManagementSystem
    Requirements
    GregoryDubois-Felsmann
    LSE-61
    LatestRevision:2017-06-30
    ThisLSSTdocumenthasbeenapprovedasaContent-Controlled
    subjecttoconfigurationcontrolandmaynotbechanged,altered,
    withoutpriorapproval.Ifthisdocumentischangedorsuperseded,
    retaintheHandledesignationshownabove.Thecontrolisonthe
    withthisHandleintheLSSTdigitalarchiveandnotprintedversions.
    LARGESYNOPTICSURVEYTELESCOPE

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    ChangeRecord
    VersionDateDescriptionOwnername
    0.12007InitialversionG.Dubois-Felsmann
    0.52009FebApprovedasacontent-controlleddocument
    bytheCCB.
    G.Dubois-Felsmann
    1.02011-06-28CapturedDMFunctionalRequirementsSpeci-
    ficationasversion1ofnewdocumentLSE-61.
    G.Dubois-Felsmann
    1.12011-08-03Requirementsnumberingapplied.Original
    numberingpreservedforatransitionperiod.
    G.Dubois-Felsmann
    2.02013-10-08Extensivereorganizationandpartialrewrite;
    correspondstoCVSrevision1.44inSysArch.
    D.Shaw,M.Juric,
    G.Dubois-Felsmann
    2.0.12013-10-08CorrectionsaffectingDMS-REQ-0176,-0267,-
    0268,-0287,andthecreationof-0317.CVS
    revision1.45.
    G.Dubois-Felsmann
    2.0.22013-10-08IncorrectstatementsremovedfromDiscus-
    sioninDMS-REQ-0271andDMS-REQ-0283,
    manytyposcorrected.CVSrevision1.46.
    G.Dubois-Felsmann
    3.02016-02-01IncorporationofLCR-188(additionofDMS-
    REQ-0318DataManagementUnscheduled
    Downtime)
    G.Dubois-Felsmann,
    andB.Selvy
    4.02017-06-30IncorporationofLCR-962.Flowdownfrom
    LSE-163.RemoveDMS-REQ-0006.Incorpo-
    rateLCR-974.AddDMS-REQ-0352.
    T.Jenness
    Documentsourcelocation:MagicDrawSysML
    Versionfromsourcerepository:241
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    ii

    LARGESYNOPTICSURVEYTELESCOPE
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    Contents
    1DataProducts2
    1.1GeneralConsiderations.......................2
    1.1.1DataAvailability........................2
    1.1.2Measurementsincatalogs....................3
    1.1.3ComputingDerivedQuantities...................3
    1.1.4DenormalizingDatabaseTables...................3
    1.1.5MaximumLikelihoodValuesandCovariances..........3....
    1.1.6StoringApproximationsofPer-pixelMetadata..........4....
    1.2DataAcquisition..........................4
    1.2.1RawImageAssembly......................4
    1.2.2RawScienceImageDataAcquisition..................5
    1.2.3RawScienceImageMetadata....................5
    1.2.4CrosstalkCorrectedScienceImageDataAcquisition........6....
    1.2.5WavefrontSensorDataAcquisition..................6
    1.2.6GuiderCalibrationDataAcquisition..................7
    1.3Level1DataProducts........................7
    1.3.1NightlyDataAccessibleWithin24hrs.................7
    1.3.2ProcessedVisitImages......................8
    1.3.3DifferenceExposures......................11
    1.3.4ExposureCatalog.......................12
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    1.3.5DIASourceCatalog.......................13
    1.3.6FaintDIASourceMeasurements...................13
    1.3.7CharacterizingVariability.....................14
    1.3.8DIAObjectCatalog.......................14
    1.3.9SSObjectCatalog.......................16
    1.3.10CalculatingSSObjectParameters...................16
    1.3.11DIAForcedSourceCatalog.....................16
    1.3.12MatchingDIASourcestoObjects...................17
    1.3.13AlertContent........................17
    1.3.14Level1DataQualityReportDefinition.................18
    1.3.15Level1PerformanceReportDefinition...........18......
    1.3.16Level1CalibrationReportDefinition.................19
    1.3.17RegeneratingL1DataProductsDuringDataRelease....19.
    1.4Level2DataProducts........................20
    1.4.1PersistingDataProducts.....................20
    1.4.2SourceCatalog........................20
    1.4.3ObjectCatalog........................21
    1.4.4AssociateSourcestoObjects....................22
    1.4.5DeepDetectionCoadds.....................22
    1.4.6TemplateCoadds.......................23
    1.4.7Multi-bandCoadds.......................24
    1.4.8BestSeeingCoadds......................24
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    1.4.9PSF-MatchedCoadds......................24
    1.4.10Detectingfaintvariableobjects...................25
    1.4.11TargetedCoadds.......................25
    1.4.12CoaddImageMethodConstraints..................25
    1.4.13ProvidePSFforCoaddedImages...................26
    1.4.14CoaddedImageProvenance....................26
    1.4.15CoaddSourceCatalog......................27
    1.4.16Forced-SourceCatalog......................28
    1.4.17TrackingCharacterizationChangesBetweenData.....28...
    1.4.18ProduceImagesforEPO.....................29
    1.4.19All-SkyVisualizationofDataReleases.................29
    1.5CalibrationDataProducts.......................30
    1.5.1CalibrationDataProducts.....................30
    1.5.2CalibrationImageProvenance...................30
    1.5.3BadPixelMap........................31
    1.5.4BiasResidualImage......................31
    1.5.5CrosstalkCorrectionMatrix....................32
    1.5.6DarkCurrentCorrectionFrame...................32
    1.5.7MonochromaticFlatfieldDataCube..................33
    1.5.8IlluminationCorrectionFrame...................33
    1.5.9FringeCorrectionFrame.....................34
    1.6Special.Programs........................34
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    1.6.1ProcessingofDataFromSpecialPrograms..........34......
    1.6.2Level1ProcessingofSpecialProgramsData..........35.....
    1.6.3ConstraintsonLevel1SpecialProgramProducts.....35..
    1.6.4SpecialProgramsDatabase....................36
    2Productions36
    2.1QueryRepeatability.........................36
    2.2UniquenessofIDsAcrossDataReleases..................36
    2.3SelectionofDatasets........................37
    2.4ProcessingofDatasets........................37
    2.5TransparentDataAccess.......................38
    2.6AlertProduction..........................38
    2.6.1Level-1ProductionCompleteness..................38
    2.6.2CalibrationImagesAvailableWithinSpecified........39.....
    2.6.3TransientAlertDistribution....................40
    2.6.4AlertFilteringService......................40
    2.6.5Level1SourceAssociation....................41
    2.6.6SSObjectPrecovery.......................42
    2.6.7DIASourcePrecovery......................42
    2.6.8UseofExternalOrbitCatalogs...................43
    2.6.9SolarSystemObjectsAvailableWithinSpecified.......43....
    2.6.10GenerateDataQualityReportWithinSpecified.......44.....
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    2.6.11GenerateDMSPerformanceReportWithinSpecified.....44...
    2.6.12GenerateCalibrationReportWithinSpecified........45.....
    2.7CalibrationProduction........................45
    2.7.1CalibrationProductionProcessing..................45
    2.8DataReleaseProduction.......................46
    2.8.1AssociatingObjectsacrossdatareleases...........46.....
    2.9Level3Production.........................46
    2.9.1AccessControlsofLevel3DataProducts...........46.....
    2.9.2Level3DataImport......................47
    2.9.3DACresourceallocationforLevel3processing.........47.....
    2.9.4Level3DataProductSelfConsistency.................48
    2.9.5ProvenanceforLevel3processingatDACs..........48......
    2.9.6SoftwareframeworkforLevel3catalogprocessing........49.....
    2.9.7SoftwareframeworkforLevel3imageprocessing........49.....
    3Software50
    3.1SoftwareArchitecturetoEnableCommunityRe-Use.........50.....
    3.2ApplicationsSoftware........................50
    3.2.1SimulatedData........................50
    3.2.2Pre-cursor,andRealData.....................51
    3.2.3ImageDifferencing.......................51
    3.2.4ProvideSourceDetectionSoftware..................51
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    3.2.5ProvideCalibratedPhotometry...................52
    3.2.6ProvideAstrometricModel....................52
    3.2.7ProvideBeamProjectorCoordinateCalculation......53...
    3.2.8EnableaRangeofShapeMeasurementApproaches.......53.....
    3.2.9ProvideUserInterfaceServices...................53
    3.3MiddlewareSoftware........................54
    3.3.1DMSInitializationComponent...................54
    3.3.2ProvideDataAccessServices....................54
    3.3.3ProvideImageAccessServices...................56
    3.3.4ControlofLevel-1Production....................57
    3.3.5ProvidePipelineExecutionServices..................57
    3.3.6ProvidePipelineConstructionServices...........59......
    3.3.7UniqueProcessingCoverage....................60
    4Facilities60
    4.1DataArchive...........................60
    4.1.1RawDataArchivingReliability...................60
    4.1.2KeepHistoricalAlertArchive....................61
    4.1.3Un-ArchivedDataProductCache...................61
    4.1.4RegenerateUn-archivedDataProducts...........62......
    4.1.5Level1DataProductAccess....................62
    4.1.6Level1&2CatalogAccess....................63
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    4.1.7ProvideEngineering&FacilityDatabaseArchive.........63.....
    4.1.8CatalogQueries........................63
    4.1.9Loggingofcatalogqueries....................64
    4.1.10ProvidingaPrecoveryService....................65
    4.1.11CatalogExportFormats.....................65
    4.1.12MaintainArchivePubliclyAccessible..................66
    4.2ComputationalInfrastructure......................66
    4.2.1DataManagementUnscheduledDowntime..........66.....
    4.2.2OptimizationofCost,ReliabilityandAvailability......67...
    4.2.3ComputePlatformHeterogeneity..................67
    4.2.4PipelineThroughput......................68
    4.2.5PipelineAvailability.......................68
    4.2.6Re-processingCapacity.....................68
    4.2.7TemporaryStorageforCommunicationsLinks.........69.....
    4.2.8InfrastructureSizingfor”catchingup”.................69
    4.2.9Incorporate.Fault-Tolerance...................70
    4.2.10IncorporateAutonomics.....................70
    4.3SummitFacility..........................71
    4.3.1SummitFacilityDataCommunications...........71......
    4.3.2PreferComputingandStorageDown.................71
    4.3.3DMSCommunicationwithOCS...................71
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    4.4SummittoBase..........................72
    4.4.1SummittoBaseNetwork.....................72
    4.4.2SummittoBaseNetworkAvailability.................72
    4.4.3SummittoBaseNetworkReliability..................73
    4.4.4SummittoBaseNetworkSecondaryLink...........73.....
    4.4.5SummittoBaseNetworkOwnershipandOperation.......74.....
    4.5BaseFacility...........................74
    4.5.1BaseFacilityInfrastructure....................74
    4.5.2BaseFacilityTemporaryStorage...................75
    4.5.3BaseFacilityCo-LocationwithExistingFacility.........75.....
    4.5.4CommissioningCluster.....................76
    4.5.5BaseWirelessLAN(WiFi).....................76
    4.6Baseto.Archive.........................77
    4.6.1BasetoArchiveNetwork.....................77
    4.6.2BasetoArchiveNetworkAvailability..................77
    4.6.3BasetoArchiveNetworkReliability..................78
    4.6.4BasetoArchiveNetworkSecondaryLink...........78.....
    4.7ArchiveCenter..........................79
    4.7.1ArchiveCenter........................79
    4.7.2ArchiveCenterDisasterRecovery..................79
    4.7.3ArchiveCenterCo-LocationwithExistingFacility........80.....
    4.8ArchivetoDataAccessCenter.....................80
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    4.8.1ArchivetoDataAccessCenterNetwork...........80......
    4.8.2ArchivetoDataAccessCenterNetworkAvailability........80.....
    4.8.3ArchivetoDataAccessCenterNetworkReliability........81.....
    4.8.4ArchivetoDataAccessCenterNetworkSecondary......81....
    4.9DataAccessCenter.........................82
    4.9.1DataAccessCenters......................82
    4.9.2DataAccessCenterSimultaneousConnections.........82.....
    4.9.3AccesstocatalogsforexternalLevel3processing........82.....
    4.9.4AccesstoimagesforexternalLevel3processing........83.....
    4.9.5AccesstoinputcatalogsforDAC-basedLevel3.....83...
    4.9.6AccesstoinputimagesforDAC-basedLevel3processing......84...
    4.9.7Federationwithexternalcatalogs..................84
    4.9.8DataAccessCenterGeographicalDistribution.........84.....
    4.9.9NoLimitonDataAccessCenters...................85
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    DataManagementSystem(DMS)Requirements
    Thisdocumentcontainsthetop-levelrequirementsforthe
    theLSST,whencombinedwiththeDataManagement-related
    temRequirements(LSR,LSE-29)andObservatorySystemSpecificationsLSE-30).
    SupportingDocuments
    1.LSSTScienceRequirementsDocument(documentLPM-17)
    2.LSSTSystemRequirements(documentLSE-29)
    3.LSSTObservatorySystemSpecifications(documentLSE-30)
    4.LSSTDocumentTree(documentLSE-39)
    DefinitionofTerms:
    Inthisdocumentarequirementreferstoadeclarationofaspecifiedfunction
    tiveperformancethatthedeliveredsystemorsubsystem
    identifiesanecessaryattribute,capability,characteristic,
    thedeliveredsystemorsubsystemtomeetaderivedorhigher
    function.
    Thisdocumentusesthetermspecification(s)tomeanoneormoreperformanceparameter(s)
    beingestablishedbyarequirementthatthedeliveredsystem
    AnattributespecifiesaquantitativeperformanceparameterinthecontextoftheSysML
    basedSysArchmodelusedtogeneratethisdocument.
    Aconstraintisusedtorefertoanexternallimitationimposedon
    itmustmeetitsrequirements(e.g.,thesurveyperformance
    ofthehistoricalweatherpatternofthechosensite).A
    systemorsubsystemitselfpossesses.
    VerbUsage:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
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    Statementsofneed,requirements,andconstraintsarewritten
    haveaspecificmeaningwithrespecttoverification.All
    conveyoperational,functional,orperformanceneeds,requirements,
    theLSSTsystemwillcontainoneofthesethreeverbs.
    •Will–Astatementoffact.Willstatementsdocumentsomething
    thecourseofnormaldesignpractice,projectprocess,
    formallyverified.
    •Should–Agoal.Shouldstatementsdocumentastretchgoal.
    icallypartneredwithashallstatement.Shouldstatements
    •Shall-Arequirementthatgetsformallyverified.Shall
    requirementsthatmustbeverifiedthroughinspection,
    duringtheverificationphaseoftheprojecttoensure
    meetstherequirement.
    1DataProducts
    1.1GeneralConsiderations
    1.1.1DataAvailability
    ID:DMS-REQ-0346
    Specification:Allrawdatausedtogenerateanypublicdataproduct
    brationframes,telemetry,configurationmetadata,etc.)
    download.
    DerivedfromRequirements:
    OSS-REQ-0004:TheArchiveFacility
    OSS-REQ-0167:DataArchiving
    OSS-REQ-0313:TelemetryDatabaseRetention
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    1.1.2Measurementsincatalogs
    ID:DMS-REQ-0347
    Specification:Allcatalogsshallrecordsourcemeasurementsin
    Discussion:Differencemeasurementscangonegativeandinmulti-epoch
    offluxesratherthanmagnitudesisrequired.Thisrequirement
    magnitudesavailablewhereappropriate.
    1.1.3ComputingDerivedQuantities
    ID:DMS-REQ-0331
    Specification:Commonderivedquantitiesshallbemadeavailable
    vidingpre-computedcolumnsorprovidingfunctionsthat
    Theseshouldatleastincludetheabilitytocalculatethe
    andmakeitaseasyaspossibletocalculatecolor-color
    Discussion:Examplequantitiesincludethoseusedtoassessmodel
    quiredforcalculatingcolor-magnitudediagrams.Care
    columnsinaclearunambiguousway.
    1.1.4DenormalizingDatabaseTables
    ID:DMS-REQ-0332
    Specification:Thedatabasetablesshallcontainviewspresented
    appropriatelydenormalizedforeaseofuse.
    1.1.5MaximumLikelihoodValuesandCovariances
    ID:DMS-REQ-0333
    Specification:Quantitiesdeliveredbyallmeasurementalgorithms
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    likelihoodvaluesandcovariances.
    Discussion:Algorithmsforwhichsuchvaluesareimpossible,
    todeclarethatthevaluesareunavailable.
    1.1.6StoringApproximationsofPer-pixelMetadata
    ID:DMS-REQ-0326
    Specification:Imagedepthandmaskinformationshallbeavailable
    proximateforminadditiontoafullper-pixelform.
    Discussion:ThisparametrizationcouldbeinformatssuchasMOC,
    regions.
    1.2DataAcquisition
    1.2.1RawImageAssembly
    ID:DMS-REQ-0024
    Specification:TheDMSshallassemblethecombinationofrawexposure
    readoutchannelsfromasingleSensortoformasingleimage
    dataandrelevantexposuremetadatashallbeintegrated
    down-streamprocessing,archiving,anddistributionto
    Discussion:Relevantexposuremetadataarethosethatdefinethe
    scopeandinstrumentconfiguration,andprovenance.
    DerivedfromRequirements:
    OSS-REQ-0114:AcquisitionofScienceSensordata
    OSS-REQ-0129:Exposures(Level1)
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    1.2.2RawScienceImageDataAcquisition
    ID:DMS-REQ-0018
    Specification:TheDMSshallacquirerawExposuredatafromthe
    duringnormaloperations,calibrationdatacollection,
    modes.
    Discussion:ThemannerofdataacquisitionisamatterfortheDM-CameraLSE-69and
    LSE-68,inthisarea.
    DerivedfromRequirements:
    OSS-REQ-0114:AcquisitionofScienceSensordata
    1.2.3RawScienceImageMetadata
    ID:DMS-REQ-0068
    Specification:Foreachrawscienceimage,theDMSshallstoreimage
    least:
    •Timeofexposurestartandend,referencedtoTAI,and
    •Sitemetadata(siteseeing,transparency,weather,observatory
    •Telescopemetadata(telescopepointing,activeoptics
    •Camerametadata(shuttertrajectory,wavefrontsensors,
    DerivedfromRequirements:
    OSS-REQ-0122:Provenance
    DMS-REQ-0066:KeepExposureArchive
    OSS-REQ-0171:EngineeringandFacilitiesData
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    1.2.4CrosstalkCorrectedScienceImageDataAcquisition
    ID:DMS-REQ-0022
    Specification:TheDMSshallacquirecrosstalkcorrectedexposure
    sciencesensors,duringnormalsurveyoperationsandinany
    Discussion:Themannerofdataacquisitionisamatterforthe
    Itmaybedifferentforthatfortherawsciencesensordata,
    latencyandreliabilityrequirements.
    ThisdataistheinputtothemainAlertProductionpipelines.
    DerivedfromRequirements:
    OSS-REQ-0114:AcquisitionofScienceSensordata
    OSS-REQ-0127:Level1DataProductAvailability
    1.2.5WavefrontSensorDataAcquisition
    ID:DMS-REQ-0020
    Specification:TheDMSshallacquirerawexposuredatafromtheCamera
    duringnormalsurveyoperationsandinanyotherrequired
    Discussion:ThedetailsofthisareamatterfortheDM-Camera
    thesedatashouldbeidenticalinformatandinmodeofacquisition
    data.
    Thereisnocurrentlyestablishedrequirementfortheacquisition
    guidersensordata.
    DerivedfromRequirements:
    OSS-REQ-0316:WavefrontSensorData
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    1.2.6GuiderCalibrationDataAcquisition
    ID:DMS-REQ-0265
    Specification:TheDMSshallacquireraw,full-frameexposures
    sorsduringcalibration.TheDMSshallproducecalibration
    sors.
    DerivedfromRequirements:
    OSS-REQ-0194:CalibrationExposuresPerDay
    1.3Level1DataProducts
    1.3.1NightlyDataAccessibleWithin24hrs
    ID:DMS-REQ-0004
    Specification:WiththeexceptionofalertsandSolarSystemObjects,
    uctsshallbemadepublicwithintimeL1PublicT(LSR-REQ-0104)oftheacquisition
    imagedata.AlertsshallbemadeavailablewithintimeOTT1(LSR-REQ-0101)fromtheconclu-
    sionofreadoutoftherawexposuresusedtogenerateeach
    alerttocommunitydistributionmechanisms.SolarSystem
    becalculatedbeforethefollowingnight’sobservingfinishes
    availablewithintimeL1PublicTofthosecalculationsbeingcompleted.
    Discussion:BecauseoftheprocessingflowofSSObjectorbitdetermination,
    base24-hours-after-data-acquisitionrequirementwould
    otherL1DataProducts,butthesystemthroughputhasto
    logcannotbuildup.
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    DescriptionValueUnitName
    Maximumtimefromtheacquisitionofscience
    datatothepublicreleaseofassociatedLevel1
    DataProducts(exceptalerts)
    24hourL1PublicT
    Thelatencyofreportingopticaltransientsfollow-
    ingthecompletionofreadoutofthelastimageof
    avisit
    1minuteOTT1
    DerivedfromRequirements:
    DMS-REQ-0003:CreateandMaintainScienceDataArchive
    OSS-REQ-0127:Level1DataProductAvailability
    1.3.2ProcessedVisitImages
    ID:DMS-REQ-0069
    Specification:TheDMSshallproduceProcessedVisitImages,inwhich
    sensorarraydatahasbeentrimmedofoverscanandcorrected
    Imagesobtainedinpairsduringastandardvisitarecombined.
    Discussion:Processedscienceexposuresarenotarchived,and
    timetofacilitatedown-streamprocessing.Theywillbe
    usingthelatestprocessingsoftwareandcalibrations.
    ThisaspectoftheprocessingforSpecialProgramsdatais
    DerivedfromRequirements:
    OSS-REQ-0129:Exposures(Level1)
    1.3.2.1BackgroundModelCalculation
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    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    ID:DMS-REQ-0327
    Specification:TheDMSshallderiveandpersistabackgroundmodel
    andastrophysical)foreachvisitimage,perCCD.
    DerivedfromRequirements:
    OSS-REQ-0056:SystemMonitoring&Diagnostics
    1.3.2.2GeneratePhotometricZeropointforVisitImage
    ID:DMS-REQ-0029
    Specification:TheDMSshallderiveandpersistaphotometriczeropoint
    perCCD.
    DerivedfromRequirements:
    DMS-REQ-0090:GenerateAlerts
    OSS-REQ-0056:SystemMonitoring&Diagnostics
    OSS-REQ-0152:Level1PhotometricZeroPointError
    1.3.2.3GeneratePSFforVisitImages
    ID:DMS-REQ-0070
    Specification:TheDMSshalldetermineacharacterizationofthe
    tioninProcessedVisitImages.
    DerivedfromRequirements:
    DMS-REQ-0116:ExtendedObjectShapeParameters
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    OSS-REQ-0056:SystemMonitoring&Diagnostics
    1.3.2.4GenerateWCSforVisitImages
    ID:DMS-REQ-0030
    Specification:TheDMSshallgenerateandpersistaWCSforeach
    accuracyoftheWCSshallbeatleastastrometricAccuracyinallareasoftheimage,
    thatthereareatleastastrometricMinStandardsstandardsavailable
    CCD.
    Discussion:TheWorldCoordinateSystemforvisitswillbeexpressed
    dardrepresentation,whichprovidesfornamedmetadata
    oneofafinitesetofcoordinatetransformations.
    DescriptionValueUnitName
    AbsoluteaccuracyoftheWCSacrossthefocal
    plane(approximatelyone-quarterofapixel).
    50milliarc-
    second
    astrometricAccuracy
    Minimumnumberofastrometricstandardsper
    CCD.
    5integerastrometricMinStandards
    DerivedfromRequirements:
    DMS-REQ-0104:ProduceCo-AddedExposures
    DMS-REQ-0090:GenerateAlerts
    OSS-REQ-0162:Level2CatalogAccuracy
    OSS-REQ-0149:Level1CatalogPrecision
    1.3.2.5DocumentingImageCharacterization
    ID:DMS-REQ-0328
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    10

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:ThepersistedformatforProcessedVisitImages
    andshallincludeadescriptionofallimagecharacterization
    Discussion:Thiswillallowthecommunitytousethemtoincrease
    imagesandderivedLSSTcatalogs.
    1.3.2.6ProcessedVisitImageContent
    ID:DMS-REQ-0072
    Specification:Processedvisitimagesshallincludethecorrected
    tegermaskarraywhereeachbit-planerepresentsalogical
    ticulardetectorpathologyaffectsthepixel,avariance
    varianceinthecorrespondingsciencepixel,andarepresentation
    thatappliesovertheextentofthesciencearray.These
    thatmappixeltoworld(sky)coordinates(theWCS)aswell
    metricmeasurementscanbederived.
    DerivedfromRequirements:
    DMS-REQ-0066:KeepExposureArchive
    OSS-REQ-0129:Exposures(Level1)
    1.3.3DifferenceExposures
    ID:DMS-REQ-0010
    Specification:TheDMSshallcreateaDifferenceExposurefromeach
    bysubtractingare-projected,scaled,PSF-matchedTemplate
    Discussion:DifferenceExposuresarenotarchived,andareretained
    tofacilitateAlertprocessing.Theycanbere-generated
    DerivedfromRequirements:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    11

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    OSS-REQ-0129:Exposures(Level1)
    DMS-REQ-0011:ProduceDifferenceSources
    DMS-REQ-0033:ProvideSourceDetectionSoftware
    1.3.3.1DifferenceExposureAttributes
    ID:DMS-REQ-0074
    Specification:ForeachDifferenceExposure,theDMSshallstore:
    exposuresandrelatedprovenanceinformation,andaset
    leastarepresentationofthePSFmatchingkernelusedin
    DerivedfromRequirements:
    DMS-REQ-0066:KeepExposureArchive
    OSS-REQ-0122:Provenance
    1.3.4ExposureCatalog
    ID:DMS-REQ-0266
    Specification:TheDMSshallcreateanExposureCatalogcontaining
    posurethatincludestheexposuredate/timeandduration,
    andtelescopepointingandorientation,statusofcalibration
    distance,telescopeanddomestatus,environmentalinformation,
    eachsensorincludinganID,itslocationinthefocalplane,
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    12

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.3.5DIASourceCatalog
    ID:DMS-REQ-0269
    Specification:TheDMSshallconstructacatalogofallSourcesdetected
    sureswithSNR>transSNR.ForeachDifferenceSource(DIASource),the
    providetheidentityoftheDifferenceExposurefromwhich
    associatedSSObject,ifany;theidentityoftheparent
    beendeblended,ifany.TheDMSshallalsomeasureandrecord
    DIASourceincludingatleast:epochoftheobservation,
    ror(pixel),skypositionandassociatederror(radec),
    andassociatederror;likelihoodoftheobserveddatagiven
    fluxandassociatederror;calibratedfluxandassociated
    lengthandangleofthetrail;fluxandassociatedparameters
    ofanadaptiveshapemeasurementandassociatederror;a
    theestimatedbackgroundatthepositionoftheobjectin
    uncertainty;ameasureofspuriousness;andflagsindicating
    computingtheaforementionedattributes.TheDMSshall
    surementsontheCalibratedexposurethefollowing:calibrated
    thesourceasmeasuredontheVisitimage.
    DescriptionValueUnitName
    Thesignal-to-noiseratioinsingle-visitdifference
    imagesabovewhichallopticaltransientsaretobe
    reported.
    5TBDtransSNR
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    DMS-REQ-0270:FaintDIASourceMeasurements
    1.3.6FaintDIASourceMeasurements
    ID:DMS-REQ-0270
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    13

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:TheDMSshallbeabletomeasureandstoreDIASourcestransSNR
    thatsatisfyadditionalcriteria.Alimitednumberofsuch
    monitoringofDIAquality.
    Discussion:Someindividualfaintsourcesmaybeofhighsignificance,
    hazardousasteroid.
    DescriptionValueUnitName
    Thesignal-to-noiseratioinsingle-visitdifference
    imagesabovewhichallopticaltransientsaretobe
    reported.
    5TBDtransSNR
    DerivedfromRequirements:
    OSS-REQ-0166:AlertCompletenessandPurity
    1.3.7CharacterizingVariability
    ID:DMS-REQ-0319
    Specification:Foralertproduction,DIAObjectvariabilitycharacterization
    collectedduringthetimeperiodfromthepresenttoatleastdiaCharacterizationCutoffin
    thepast.
    Discussion:ThesemeasurementscancomefromtheliveL1database.
    duringDataReleaseProduction,alldatashouldbeusedfor
    DescriptionValueUnitName
    Time-periodtouseforcharacterizingvariabilityin
    L1system.
    1yeardiaCharacterizationCutoff
    1.3.8DIAObjectCatalog
    ID:DMS-REQ-0271
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    14

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:TheDMSshallconstructacatalogofallastrophysical
    differenceimageanalysis(DIAObjects).TheDIAObjectentries
    includingatleast:auniqueidentifier;theidentifiersdiaNearbyObjMaxStarnearest
    starsanddiaNearbyObjMaxGalaxynearestgalaxiesintheObjectcatalogdiaN-
    earbyObjRadius,theprobabilitythattheDIAObjectisthesame
    setofDIAObjectproperties.
    DescriptionValueUnitName
    Maximumnumberofnearbygalaxiesthatcanbe
    associatedwithaDIASource.
    3integerdiaNearbyObjMaxGalaxy
    Maximumnumberofstarsthatcanbeassociated
    withaDIASource.
    3integerdiaNearbyObjMaxStar
    RadiuswithinwhichanObjectisconsideredtobe
    near,andpossiblycoincidentwith,theDIASource.
    60arcsec-
    ond
    diaNearbyObjRadius
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    1.3.8.1DIAObjectAttributes
    ID:DMS-REQ-0272
    Specification:ForeachDIAObjecttheDMSshallstoresummaryattributes
    skypositionatthetimeoftheobservation;astrometric
    parallaxandrelatederrors;point-sourcemagnitudein
    weightedmeanforced-photometryfluxandrelatederror;
    itymeasures;andflagsthatencodespecialconditionsencountered
    quantities.
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    15

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.3.9SSObjectCatalog
    ID:DMS-REQ-0273
    Specification:TheDMSshallproduceacatalogofallSolarSystem
    havebeenidentifiedviaMovingObjectProcessing.TheSSObject
    entryattributesincludingatleastthefollowing:Osculating
    uncertainties,minimumorbitintersectiondistance(MOID),
    slopeparameterperbandandassociatederrors,andflags
    description.
    Discussion:Themagnitudeandangularvelocitylimitsforidentifying
    Theselimitsmaybedrivenmorebycomputationalresource
    ofthecollecteddata.Thesoftwaremaywellbecapableof
    atanunacceptablecost.Theslopeparameterwillbepoorly
    vey.Abaselinealgorithmandacceptancecriteriashould
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    1.3.10CalculatingSSObjectParameters
    ID:DMS-REQ-0323
    Specification:TheLSSTdatabaseshallprovidefunctionstocompute,
    phaseangleforeveryobservation,andthereducedandabsolute
    LSSTbands.
    1.3.11DIAForcedSourceCatalog
    ID:DMS-REQ-0317
    Specification:TheDMSshallcreateaDIAForcedSourceCatalog,consisting
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    16

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    forentriesintheDIAObjectCatalogonDifferenceExposures.
    sourceshallincludetheDIAObjectandvisitIDs,themodeled
    tion,shape,anddeblendingparameters),andmeasurement
    Discussion:Thelargenumberofsuchforcedsourcesmakesitimpractical
    attributesthanarenecessarytoconstructalightcurve
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    1.3.12MatchingDIASourcestoObjects
    ID:DMS-REQ-0324
    Specification:AL1DIASourcetoL2Objectpositionalcross-match
    shallbemadeavailable.
    Discussion:Careshouldbetakentonotethatthisispurelyacross-match
    tionontheskyanddoesnotimplytheDIASourceandObject
    1.3.13AlertContent
    ID:DMS-REQ-0274
    Specification:TheDMSshallcreateanAlertforeachdetectedDIASource,
    ingcommunityprotocols,withcontentthatincludes:aunique
    ID,theDIASourcerecordthattriggeredthealert,theDIAObject
    viousDIASourcerecordscorrespondingtotheobject(if
    boththetemplateimageandthedifferenceimage)ofsufficient
    DIASourceanditsimmediatesurroundings.Thesecutouts
    andmaskinformation.
    Discussion:TheaimfortheAlertcontentistoincludesufficient
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    17

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    self-contained,andtominimizethedemandforfollow-up
    Thisapproachwilllikelyincreasethespeedandefficiency
    DerivedfromRequirements:
    OSS-REQ-0128:Alerts
    1.3.14Level1DataQualityReportDefinition
    ID:DMS-REQ-0097
    Specification:TheDMSshallproduceaLevel1DataQualityReport
    dataqualitythatresultfromrunningtheDMSpipelines,
    pointvs.timeforeachutilizedfilter;Skybrightnessvs.
    timeforeachutilizedfilter;PSFparametersvs.timefor
    forpointsourcesvs.magforeachutilizedfilter.
    Discussion:Theseeingreportisintendedasabroad-brushmeasure
    PSFparametersprovidemoredetail,astheyincludeasymmetries
    dence.
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    DMS-REQ-0096:GenerateDataQualityReportWithinSpecifiedTime
    1.3.15Level1PerformanceReportDefinition
    ID:DMS-REQ-0099
    Specification:TheDMSshallproduceaLevel1PerformanceReport
    ofhowtheDMShasperformedinprocessingthenight’sobservations,
    berofobservationssuccessfullyprocessedthrougheach
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    18

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    foreachpipelinethathadrecoverablefailures(witha
    erymechanism);numberofobservationsforeachpipeline
    numberofobservationsarchivedateachDMSFacility;number
    sciencecriteriaforeachactivescienceprogram.
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    DMS-REQ-0098:GenerateDMSPerformanceReportWithinSpecified
    1.3.16Level1CalibrationReportDefinition
    ID:DMS-REQ-0101
    Specification:TheDMSshallproduceaLevel1CalibrationReport
    ofsignificantdifferencesinCalibrationImagesthatmay
    telescopeorcamera,includinganightlybroad-bandflat
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    DMS-REQ-0100:GenerateCalibrationReportWithinSpecifiedTime
    1.3.17RegeneratingL1DataProductsDuringDataRelease
    ID:DMS-REQ-0325
    Specification:DuringDataReleaseProcessing,alltheLevel1data
    eratedusingthecurrentbestalgorithms.
    Discussion:Variabilitycharacterizationwillusethefulllight
    DerivedfromRequirements:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    19

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    OSS-REQ-0135:Uniformlycalibratedandprocessedversions
    1.4Level2DataProducts
    1.4.1PersistingDataProducts
    ID:DMS-REQ-0334
    Specification:Allper-banddeepcoaddsandbestseeingcoadds
    andmadeavailabletousers.
    Discussion:Thisrequirementisintendedtolistallthedataproduc
    ratherthanregeneratedondemand.DMS-REQ-0069indicatesindiscussionthat
    VisitImagesarenotarchived.DMS-REQ-0010indicatesinthediscussionthat
    posuresarenotarchived.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.2SourceCatalog
    ID:DMS-REQ-0267
    Specification:TheDMSshallcreateaCatalogcontainingallSources
    dard)visitsandonCo-Adds,andwillcontainanidentifier
    wasdetected,aswellasmeasurementsofSourceAttributes.
    associatederrors)includelocationonthefocalplane;
    coordinatesandflux;acentroidandadaptivemoments;and
    lipticalmultipleaperturesthatareconcentric,PSF-homogenized,
    inintensity.
    DerivedfromRequirements:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    20

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    OSS-REQ-0137:Catalogs(Level2)
    1.4.3ObjectCatalog
    ID:DMS-REQ-0275
    Specification:TheDMSshallcreateanObjectCatalog,basedonsources
    knowledgeofCoaddSource,DIASource,DIAObject,andSSObject
    spatialassociationandcharacterization.
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    1.4.3.1ProvidePhotometricRedshiftsofGalaxies
    ID:DMS-REQ-0046
    Specification:TheDMSshallcomputeaphotometricredshiftfor
    DerivedfromRequirements:
    DMS-REQ-0040:EnableBAOAnalysis
    1.4.3.2ObjectCharacterization
    ID:DMS-REQ-0276
    Specification:EachentryintheObjectCatalogshallincludethe
    measures:apoint-sourcemodelfit,abulge-diskmodelfit,
    tivemoments,PetrosianandKronfluxes,surfacebrightness
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    21

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    motionandparallax,andavariabilitycharacterization.
    Discussion:ThesemeasurementsareintendedtoenableLSST”static
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    1.4.4AssociateSourcestoObjects
    ID:DMS-REQ-0034
    Specification:TheDMSshallassociateSourcesmeasuredatdifferent
    passbandswithentriesintheObjectcatalog.
    Discussion:ThetaskofassociationistorelateSourcesfromdifferent
    positions,tothecorrespondingObjects.Havingmadethese
    mentscanbemadeonthefullobjectdatatogenerateastronomically
    DerivedfromRequirements:
    OSS-REQ-0339:Level2Source-ObjectAssociationQuality
    DMS-REQ-0081:ProduceObjectCatalog
    1.4.5DeepDetectionCoadds
    ID:DMS-REQ-0279
    Specification:TheDMSshallperiodicalycreateCo-addedImagesu,g,r,i,z,y
    passbandsbycombiningallarchivedexposurestakenofthe
    samepassbandthatmeetspecifiedqualityconditions.
    Discussion:Qualityattributesmayincludethresholdsonseeing,
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    22

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    quality,PSFshapeandspatialvariability,ordateofexposure.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.6TemplateCoadds
    ID:DMS-REQ-0280
    Specification:TheDMSshallperiodicallycreateTemplateImagesu,g,r,i,z,y
    passbandsthatareconstructedidenticallytoDeepDetection
    tributingCalibratedExposuresarelimitedtoarangeoftemplateMax-
    Timespan,theimagesarepartitionedbyairmassintomultiple
    criteriamaybedifferent.
    Discussion:ImageTemplatesareusedbytheImageDifferencepipeline
    tifyingtransientorvariablesources.Therangeofepochs
    slowlymovingsources(suchashighpropermotionstars)
    ticipatedthatseparatetemplateswillbecreatedineach
    airmass.
    DescriptionValueUnitName
    Maximumrangeinobservedepochoverwhichin-
    putExposuresmaycontributetoatemplateim-
    age.
    1yeartemplateMaxTimespan
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    23

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.4.7Multi-bandCoadds
    ID:DMS-REQ-0281
    Specification:TheDMSshallperiodicallycreateMulti-bandCoadd
    structedsimilarlytoDeepDetectionCoadds,butwhereall
    Discussion:Themulti-colorCoaddsareintendedforverydeep
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.8BestSeeingCoadds
    ID:DMS-REQ-0330
    Specification:Bestseeingcoaddsshallbemadeforeachband(including
    Discussion:DMS-REQ-0279statesthatseeing-basedco-addsshould
    quirementstatesthattheyshallbemade.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.9PSF-MatchedCoadds
    ID:DMS-REQ-0335
    Specification:One(ugrizyplusmulti-band)setofPSF-matched
    shallnotbearchived.
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    24

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Discussion:Theseareusedtomeasurecolorsandshapesofobjects
    Sufficientprovenanceinformationwillbemadeavailable
    atedbyLevel3users.
    1.4.10Detectingfaintvariableobjects
    ID:DMS-REQ-0337
    Specification:TheDMSshallbeabletodetectfaintobjectsshowing
    nearbyobjectwithhighpropermotions.
    Discussion:Forexample,thiscouldbeimplementedusingshort-period
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.11TargetedCoadds
    ID:DMS-REQ-0338
    Specification:Itshallbepossibletoretainsmallsectionsofall
    Discussion:Thissupportsqualityassessmentandtargetedscience.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    LSR-REQ-0040:DataQualityMonitoring
    1.4.12CoaddImageMethodConstraints
    ID:DMS-REQ-0278
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    25

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:CoaddImagesshallbecreatedbycombiningspatially
    VisitImages(onwhichbadpixelsandtransientsources
    tributingProcessedVisitImageshavebeenre-projected
    andmatchedtoacommonbackgroundlevelwhichbestapproximates
    ground.
    Discussion:Itisexpectedthatcoaddedimageswillbeproduced
    thesky,notjustthemainsurveyarea.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.13ProvidePSFforCoaddedImages
    ID:DMS-REQ-0047
    Specification:TheDMSshalldetermineacharacterizationofthe
    tionincoaddedimages.
    Discussion:ThePSFmodelwillbeprimarilyusedtoperforminitial
    andbootstrappingofmulti-epochobjectcharacterization
    DerivedfromRequirements:
    DMS-REQ-0041:MeasureIntrinsicEllipticitiesofSmall
    OSS-REQ-0153:WorldCoordinateSystemAccuracy
    OSS-REQ-0316:WavefrontSensorData
    OSS-REQ-0136:Co-addedExposures
    1.4.14CoaddedImageProvenance
    ID:DMS-REQ-0106
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    26

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:ForeachCoaddedImage,DMSshallstore:thelist
    pipelineparameters,includingsoftwareversions,used
    metadataattributesforuserstore-createtheminwhole
    Discussion:Notallcoaddedimagetypeswillbemadeavailable
    thelifeofthesurvey;however,sufficientmetadatawill
    recreatedbyend-users.
    DerivedfromRequirements:
    OSS-REQ-0122:Provenance
    DMS-REQ-0104:ProduceCo-AddedExposures
    1.4.15CoaddSourceCatalog
    ID:DMS-REQ-0277
    Specification:TheDMSshall,inthecourseofcreatingthemaster
    catalogfromthecoaddsofallsourcesdetectedineachpassbandcoaddDetect-
    Thresh.
    Discussion:CoaddSourcesareingeneralcompositesofoverlapping
    ThiscatalogisanintermediateproductinDRproduction,
    norreleasedtoend-users.
    DescriptionValueUnitName
    S/NthresholdfordetectingsourcesinCo-Addim-
    agesforbuildingtheSourceCatalog.
    5floatcoaddDetectThresh
    DerivedfromRequirements:
    DMS-REQ-0267:SourceCatalog
    OSS-REQ-0137:Catalogs(Level2)
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    27

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.4.15.1Detectingextendedlowsurfacebrightnessobjects
    ID:DMS-REQ-0349
    Specification:Itshallbepossibletodetectextendedlowsurface
    Discussion:Forexample,thiscouldbedonebyusingthebinned
    SDSS.
    1.4.16Forced-SourceCatalog
    ID:DMS-REQ-0268
    Specification:TheDMSshallcreateaForced-SourceCatalog,consisting
    forallentriesintheObjectCatalogonallProcessedVisit
    surementsforeachforced-sourceshallincludetheobject
    error(givenfixedposition,shape,anddeblendingparameters),
    flags.
    Discussion:ThelargenumberofForcedSourcesmakesitimpractical
    tributesthanarenecessarytoconstructalightcurvefor
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    1.4.17TrackingCharacterizationChangesBetweenData
    ID:DMS-REQ-0339
    Specification:Small,overlapping,samplesofdatafromolderreleases
    inthedatabase.
    Discussion:Thisenablesacomparisonofhowcurrentdatareleases
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    28

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    releasesandtoimprovedataqualitymonitoring.
    DerivedfromRequirements:
    LSR-REQ-0040:DataQualityMonitoring
    1.4.18ProduceImagesforEPO
    ID:DMS-REQ-0103
    Specification:TheDMSshallproduceimagesforEPOpurposes,according
    mentsintheDM-EPOICD.
    Discussion:Thisisexpectedtoincludepolychromatic(e.g.,RGB
    TheDM-EPO ICD isLSE-131.
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    1.4.19All-SkyVisualizationofDataReleases
    ID:DMS-REQ-0329
    Specification:DataReleaseProcessingshallgenerateco-addssuitable
    alizationtools,allowingpanningandzoomingoftheentire
    Discussion:Forexample,thiscouldmeanHEALPixtilessuitable
    exacttechnologychoicehastobeconfirmedbeforeunderstanding
    DerivedfromRequirements:
    OSS-REQ-0136:Co-addedExposures
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    29

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.5CalibrationDataProducts
    1.5.1CalibrationDataProducts
    ID:DMS-REQ-0130
    Specification:TheDMSshallproduceandarchiveCalibrationData
    thesignatureofthetelescope,cameraanddetector,including
    matrix,BiasandDarkcorrectionframes,asetofmonochromatic
    wavelengthrange,asyntheticbroad-bandflatperfilter,
    perfilter.
    DerivedfromRequirements:
    DMS-REQ-0076:KeepScienceDataArchive
    OSS-REQ-0129:Exposures(Level1)
    OSS-REQ-0194:CalibrationExposuresPerDay
    OSS-REQ-0271:SupportedImageTypes
    1.5.2CalibrationImageProvenance
    ID:DMS-REQ-0132
    Specification:ForeachCalibrationProductiondataproduct,DMS
    inputexposuresandtherangeofdatesoverwhichtheywere
    rameters;thecalibrationproductsusedtoderiveit;and
    atleast:thedateofcreation;thecalibrationimagetype
    theprovenanceoftheprocessingsoftware;andtheinstrument
    filterinuse,ifapplicable.
    DerivedfromRequirements:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    DMS-REQ-0130:CalibrationDataProducts
    OSS-REQ-0122:Provenance
    OSS-REQ-0123:Reproducibility
    1.5.3BadPixelMap
    ID:DMS-REQ-0059
    Specification:TheDMSshallproduceonanas-neededbasisamap
    areaffectedbyoneormorepathologies,suchasnon-responsive
    pixels.Theparticularpathologiesshallbebit-encoded
    additionalpathologiesmayalsoberecordedindown-stream
    Discussion:Thefractionofbadpixelsisexpectedtobesmall.
    whilelogicallyequivalenttoanimage,maybestoredin
    DerivedfromRequirements:
    DMS-REQ-0058:CorrectforInstrumentSensitivityVariation
    OSS-REQ-0129:Exposures(Level1)
    OSS-REQ-0271:SupportedImageTypes
    1.5.4BiasResidualImage
    ID:DMS-REQ-0060
    Specification:TheDMSshallconstructonanas-neededbasisanimage
    temporallystablebiasstructurethatremainsafteroverscan
    shallbeconstructedfrommultiple,zero-secondexposures
    hasbeenapplied.
    DerivedfromRequirements:
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    DMS-REQ-0055:CorrectforCameraBiasStructure
    OSS-REQ-0271:SupportedImageTypes
    OSS-REQ-0046:Calibration
    1.5.5CrosstalkCorrectionMatrix
    ID:DMS-REQ-0061
    Specification:TheDMSshall,onanas-neededbasis,determinefrom
    datawhatfractionofthesignaldetectedinanygivenamplifier
    planeappearsinanyotheramplifier,andshallrecordthat
    Theapplicabilityofthecorrectionmatrixshallbeverified
    data.
    Discussion:ThefrequencywithwhichtheCross-talkCorrection
    willbedeterminedduringCommissioningandmonitoredduring
    DerivedfromRequirements:
    DMS-REQ-0056:CorrectforCameraCrosstalk
    OSS-REQ-0349:DataReleaseProductionCrosstalkCorrection
    1.5.6DarkCurrentCorrectionFrame
    ID:DMS-REQ-0282
    Specification:TheDMSshallproduceonanas-neededbasisadark
    whichisconstructedfrommultiple,closed-shutterexposures
    effectivenessoftheDarkCorrectionshallbeverifiedinproduction
    Discussion:Theneedforadarkcurrentcorrectionwillhaveto
    sioning.Collectingclosed-domedarkexposuresmaybedeemed
    healthofthedetectors,evenifnotusedincalibration
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    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    DerivedfromRequirements:
    OSS-REQ-0271:SupportedImageTypes
    OSS-REQ-0046:Calibration
    1.5.7MonochromaticFlatfieldDataCube
    ID:DMS-REQ-0063
    Specification:TheDMSshallproduceonanas-neededbasisanimage
    color-dependent,pixel-to-pixelnon-uniformityinthe
    cubeshallbeconstructedfromexposuresatmultiplewavelengths
    source.Theeffectivenessoftheflat-fieldshallbeverified
    data.
    Discussion:Monochromaticflat-fieldsareexpectedtobeproduced
    monthly,owingtothetimerequiredtoobtaintheexposures.
    DerivedfromRequirements:
    DMS-REQ-0058:CorrectforInstrumentSensitivityVariation
    DMS-REQ-0057:CorrectforDetectorFringing
    OSS-REQ-0271:SupportedImageTypes
    OSS-REQ-0046:Calibration
    1.5.8IlluminationCorrectionFrame
    ID:DMS-REQ-0062
    Specification:TheDMSshallproduceonanas-neededbasisanimage
    non-uniformilluminationoftheflat-fieldcalibrationapparatus
    tivenessoftheIlluminationCorrectionshallbeverified
    data.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Discussion:TheIlluminationcorrectionisanticipatedtobe
    rectionshouldbenomorefrequentthanmonthly.
    DerivedfromRequirements:
    DMS-REQ-0058:CorrectforInstrumentSensitivityVariation
    OSS-REQ-0271:SupportedImageTypes
    OSS-REQ-0046:Calibration
    1.5.9FringeCorrectionFrame
    ID:DMS-REQ-0283
    Specification:TheDMSshallproduceonanas-neededbasisanimage
    tectorfringing.TheeffectivenessoftheFringeCorrection
    cessingonsciencedata.
    Discussion:Fringingislikelytoaffectonlythereddestfilters,
    comessemi-transparenttoincidentlight.
    DerivedfromRequirements:
    OSS-REQ-0271:SupportedImageTypes
    OSS-REQ-0046:Calibration
    1.6SpecialPrograms
    1.6.1ProcessingofDataFromSpecialPrograms
    ID:DMS-REQ-0320
    Specification:Itshallbepossibleforspecialprogramstotrigger
    recipes.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Discussion:ThisaffectsbothL1andL2dataproducts.Forsome
    maybeminimalistL1processing,forotherspecialprograms
    standardalertgenerationprocessing.Thescopeofspecial
    undefined.
    DerivedfromRequirements:
    LSR-REQ-0075:SurveyTimeAllocation
    1.6.2Level1ProcessingofSpecialProgramsData
    ID:DMS-REQ-0321
    Specification:AllLevel1processingfromspecialprogramsshall
    arrivesfromthefollowingnight’sobservations.
    1.6.3ConstraintsonLevel1SpecialProgramProductsGeneration
    ID:DMS-REQ-0344
    Specification:ThepublishingofLevel1dataproductsfromSpecial
    jecttothesameperformancerequirementsofthestandard
    L1PublicTandOTT1.
    DescriptionValueUnitName
    Maximumtimefromtheacquisitionofscience
    datatothepublicreleaseofassociatedLevel1
    DataProducts(exceptalerts)
    24hourL1PublicT
    Thelatencyofreportingopticaltransientsfollow-
    ingthecompletionofreadoutofthelastimageof
    avisit
    1minuteOTT1
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    1.6.4SpecialProgramsDatabase
    ID:DMS-REQ-0322
    Specification:Dataproductsforspecialprogramsshallbestored
    tinctfromthoseusedtostorestandardLevel1andLevel
    forthesedatabasestobefederatedwiththeLevel1and
    queriesandjoins.
    2Productions
    2.1QueryRepeatability
    ID:DMS-REQ-0291
    Specification:TheDMSshallensurethatanyqueryexecutedata
    againstanyDMSdelivereddatabaseshallberepeatableat
    thatareeitheridenticalorincludeadditionalresults
    ing).
    Discussion:Itwouldbedesirabletohavetheabilityto”save”
    datareleasewouldbeincludedexplicitly.Additionally,
    aDOIwouldallowqueriestobesharedandincludedinscientific
    largecopyandpaste.
    DerivedfromRequirements:
    OSS-REQ-0181:DataProductsQueryandDownloadInfrastructure
    2.2UniquenessofIDsAcrossDataReleases
    ID:DMS-REQ-0292
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:Toreducethelikelihoodforconfusion,allIDsshall
    anddatabaseversions,otherthanthosecorrespondingto
    IDsofexposures).
    Discusion:Forexample,DR4andDR5(oranyother)releasewill
    Source,DIAObjectorDIASourceIDs.
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    OSS-REQ-0130:Catalogs(Level1)
    2.3SelectionofDatasets
    ID:DMS-REQ-0293
    Specification:ADatasetmayconsistofoneormorepixelimages,
    database,oranyothergroupingofdatathatareprocessed
    DMSshallbeabletoidentifyandretrievecomplete,consistent
    Discussion:LogicalgroupingsmightbepairsofExposuresina
    metadataandprovenanceinformation,ormightbegroupings
    3processing.
    DerivedfromRequirements:
    OSS-REQ-0118:ConsistencyandCompleteness
    OSS-REQ-0176:DataAccess
    2.4ProcessingofDatasets
    ID:DMS-REQ-0294
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:TheDMSshallprocessallrequesteddatasetsuntil
    isrecordedorapermanentfailureisrecognized.Ifany
    whole,morethanonce,onlyoneofthewhollyprocessedresults
    processing.
    Discussion:ThecriteriamaybespecifiedbyDMSprocessingsoftware,
    userforLevel-3production.
    DerivedfromRequirements:
    OSS-REQ-0117:AutomatedProduction
    OSS-REQ-0118:ConsistencyandCompleteness
    OSS-REQ-0119:Completeness
    OSS-REQ-0120:Consistency
    2.5TransparentDataAccess
    ID:DMS-REQ-0295
    Specification:TheDMSshallprovideaninterfacethatallowsretrieval
    scienceusersofdatasetsfromanyFacilitywheretheymay
    uration.
    DerivedfromRequirements:
    OSS-REQ-0176:DataAccess
    2.6AlertProduction
    2.6.1Level-1ProductionCompleteness
    ID:DMS-REQ-0284
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:TheDMSshallensurethatallimagestakenbythe
    Level-1processingareeventuallyretrieved,archived,
    nectivityfailurebetweendownstreamFacilities.
    DerivedfromRequirements:
    OSS-REQ-0052:SummitDataBuffer
    2.6.2CalibrationImagesAvailableWithinSpecifiedTime
    ID:DMS-REQ-0131
    Specification:CalibrationproductsfromagroupofuptonCalExpProcrelatedexposures
    thatshouldbeprocessedtogether,shallbeavailablefromcal-
    ProcTimeoftheendoftheacquisitionofimages/dataforthat
    Discussion:Themotivationhereisthatcalibrationimageswill
    priortothestartofobservingandthisrequirementallows
    plannedaccordingly.
    DescriptionValueUnitName
    TimeallowedtoprocessnCalExpProccalibration
    exposuresandhavethemavailablewithinthe
    DMS.
    1200secondcalProcTime
    Maximumnumberofcalibrationexposuresthat
    canbeprocessedtogetherwithintimecalProc-
    Time.
    25integernCalExpProc
    DerivedfromRequirements:
    DMS-REQ-0130:CalibrationDataProducts
    OSS-REQ-0021:BaseSite
    OSS-REQ-0046:Calibration
    OSS-REQ-0194:CalibrationExposuresPerDay
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    2.6.3TransientAlertDistribution
    ID:DMS-REQ-0002
    Specification:Identifiedtransienteventsshallbemadeavailable
    alerts,whichshallbepublishedtocommunityalertdistribution
    standardprotocols,tobedeterminedduringtheLSSTconstruction
    dardsevolve.
    DerivedfromRequirements:
    OSS-REQ-0127:Level1DataProductAvailability
    OSS-REQ-0184:TransientAlertPublication
    2.6.4AlertFilteringService
    ID:DMS-REQ-0342
    Specification:Abasic,limitedcapacity,alertfilteringservice
    givenuserdefinedfilterstoreducethealertstreamtomanageable
    DerivedfromRequirements:
    LSR-REQ-0025:TransientFiltering
    2.6.4.1Pre-definedalertfilters
    ID:DMS-REQ-0348
    Specification:UsersoftheLSSTAlertFilteringServiceshallbe
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    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    ofsimplefilters.
    Discussion:SeeLSR-REQ-0026
    DerivedfromRequirements:
    LSR-REQ-0026:PredefinedTransientFilters
    2.6.4.2PerformanceRequirementsforLSSTAlertFiltering
    ID:DMS-REQ-0343
    Specification:TheLSSTalertfilteringserviceshallsupportnumBrokerUserssimultaneous
    userswitheachuserallocatedabandwidthcapableofreceivingnumBro-
    kerAlertsalertspervisit.
    Discussion:Theconstraintonnumberofalertsisspecifiedfor
    butcouldalsobesatisfiedbyallalertsbeingreceivedwith
    DescriptionValueUnitName
    Numberoffull-sizedalertsthatcanbereceived
    pervisitperuser.
    20integernumBrokerAlerts
    Supportednumberofsimultaneoususerscon-
    nectedtotheLSSTalertfilteringsystem.
    100integernumBrokerUsers
    DerivedfromRequirements:
    OSS-REQ-0184:TransientAlertPublication
    2.6.5Level1SourceAssociation
    ID:DMS-REQ-0285
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    Specification:TheDMSshallassociateclustersofDIASources
    takenatdifferenttimeswitheitheraDIAObjectoranSSObject.
    Discussion:Theassociationwillrepresenttheunderlyingastrophysical
    DerivedfromRequirements:
    OSS-REQ-0159:Level1MovingObjectQuality
    OSS-REQ-0160:Level1DifferenceSource-DifferenceObject
    OSS-REQ-0130:Catalogs(Level1)
    2.6.6SSObjectPrecovery
    ID:DMS-REQ-0286
    Specification:UponidentifyinganewSSObject,theDMSshallassociate
    jectsthatareconsistentwiththeorbitalparameters(precovery),
    soassociated.
    DerivedfromRequirements:
    OSS-REQ-0159:Level1MovingObjectQuality
    2.6.7DIASourcePrecovery
    ID:DMS-REQ-0287
    Specification:ForallDIASourcesnotassociatedwitheitherDIAObjects
    DMSshallperformforcedphotometryatthelocationofthe
    DifferenceExposuresobtainedinthepriorprecoveryWindow,andmaketheresultspublicly
    availablewithinL1PublicT.
    Discussion:TheprecoveryWindowisintendedtosatisfythemostcommon
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    cases(e.g.,Supernovae),withoutplacinganundueburden
    Forreasonsofpracticalityandefficiency,precoveryWindow<=l1CacheLifetime.
    DescriptionValueUnitName
    Maximumlook-backtimeforprecoverymeasur-
    mentsonpriorExposures.
    30dayprecoveryWindow
    Maximumtimefromtheacquisitionofscience
    datatothepublicreleaseofassociatedLevel1
    DataProducts(exceptalerts)
    24hourL1PublicT
    Lifetimeinthecacheofun-archivedLevel-1data
    products.
    30dayl1CacheLifetime
    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    2.6.8UseofExternalOrbitCatalogs
    ID:DMS-REQ-0288
    Specification:ItshallbepossibleforDMStomakeuseofapproved
    observationstoimprovetheidentificationofSSObjects,
    thetransientAlertstreaminnightlyprocessing.
    DerivedfromRequirements:
    OSS-REQ-0159:Level1MovingObjectQuality
    2.6.9SolarSystemObjectsAvailableWithinSpecifiedTime
    ID:DMS-REQ-0089
    Specification:Detectedmovingobjectsandassociatedmetadata
    accessintheDMSsciencedataarchivewithintimeL1PublicToftheirgenerationbythe
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    DerivedfromRequirements:
    DMS-REQ-0004:NightlyDataAccessibleWithin24hrs
    DMS-REQ-0086:ProduceOrbitCatalog
    OSS-REQ-0127:Level1DataProductAvailability
    2.6.10GenerateDataQualityReportWithinSpecifiedTime
    ID:DMS-REQ-0096
    Specification:TheDMSshallgenerateanightlyDataQualityReportdqReport-
    ComplTimeinbothhuman-readableandmachine-readableforms.
    Discussion:TheReportmustbetimelyinordertoevaluatewhether
    software,orproceduresareneededforthefollowingnight’s
    DescriptionValueUnitName
    LatencyforproducingLevel1DataQualityReport.4hourdqReportComplTime
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    2.6.11GenerateDMSPerformanceReportWithinSpecified
    ID:DMS-REQ-0098
    Specification:TheDMSshallgenerateanightlyDMSPerformanceper-
    fReportComplTimeinbothhuman-readableandmachine-readable
    Discussion:TheReportmustbetimelyinordertoevaluatewhether
    software,orproceduresareneededforthefollowingnight’s
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    theirprovisionswaivedwithoutpriorapproval.
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    DescriptionValueUnitName
    LatencyforproducingLevel1DMSPerformance
    Report.
    4hourperfReportComplTime
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    2.6.12GenerateCalibrationReportWithinSpecifiedTime
    ID:DMS-REQ-0100
    Specification:TheDMSshallgenerateanightlyCalibrationReportcalibReport-
    ComplTimeinbothhuman-readableandmachine-readableforms.
    Discussion:TheReportmustbetimelyinordertoevaluatewhether
    software,orproceduresareneededforthefollowingnight’s
    DescriptionValueUnitName
    LatencyforproducingLevel1CalibrationReport.4hourcalibReportComplTime
    DerivedfromRequirements:
    OSS-REQ-0131:NightlySummaryProducts
    2.7CalibrationProduction
    2.7.1CalibrationProductionProcessing
    ID:DMS-REQ-0289
    Specification:TheDMSshallbecapableofproducingcalibration
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    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    neededbasis,consistentwithmonitoringthehealthand
    availabilityofrawcalibrationexposures,thetemporal
    SRDrequirementsforcalibrationaccuracy.
    DerivedfromRequirements:
    OSS-REQ-0170:CalibrationData
    OSS-REQ-0004:TheArchiveFacility
    2.8DataReleaseProduction
    2.8.1AssociatingObjectsacrossdatareleases
    ID:DMS-REQ-0350
    Specification:ItshallbepossibletoassociateanObjectinone
    likelymatchintheObjecttablefromanotherdatarelease.
    previousdatareleasesbeingonline.
    Discussion:Thiscouldbedonewithadatabasetablemappingevery
    leasetothematchedObjectineveryotherdatarelease.
    2.9Level3Production
    2.9.1AccessControlsofLevel3DataProducts
    ID:DMS-REQ-0340
    Specification:AllLevel3dataproductsshallbeconfiguredtohave
    restrictedtotheowner,alistofpeople,anamedgroup,
    Discussion:ThesefeaturesaresupportedbyVOSpace.
    DerivedfromRequirements:
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    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    OSS-REQ-0142:Access
    OSS-REQ-0176:DataAccess
    OSS-REQ-0187:InformationSecurity
    2.9.2Level3DataImport
    ID:DMS-REQ-0290
    Specification:TheDMSshallbeabletoingesttablesfromcommon
    tables,CSVfileswithsupportingmetadata)tofacilitate
    theproductionofLevel-3dataproducts.
    DerivedfromRequirements:
    OSS-REQ-0140:Production
    2.9.3DACresourceallocationforLevel3processing
    ID:DMS-REQ-0119
    Specification:TheDMSshallprovidearesourceallocationmechanism
    allowstheprioritizationandallocationofresourcesto
    Discussion:ItisassumedthattheDACLevel3processingresources
    scribed,makingthisnecessary.
    DerivedfromRequirements:
    OSS-REQ-0143:ResourceAllocation
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    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    2.9.4Level3DataProductSelfConsistency
    ID:DMS-REQ-0120
    Specification:TheDMSshallprovideameansforensuringthatusers’
    taskscanbecarriedoutonself-consistentinputs-i.e.,
    tions,cameraconfigurationdata,etc.,thatmatcheach
    Level1andLevel2processings.
    DerivedfromRequirements:
    OSS-REQ-0120:Consistency
    OSS-REQ-0118:ConsistencyandCompleteness
    2.9.5ProvenanceforLevel3processingatDACs
    ID:DMS-REQ-0121
    Specification:TheDMSshallprovideameansforrecordingprovenance
    3processingthatisperformedatDACs,coveringatleast
    processing(e.g.,catalogdatausedasinputs,datasetmetadata,
    fromtheEFD).
    Discussion:TheDMSshouldalsoprovideanoptionalmeansfor
    atDACstomaintainbasicprovenanceinformationontheir
    suchascodeoradditionalcalibrationdata.
    Rationale:theDMSshouldfacilitateLevel3processingusers
    workinareproducibleway.
    DerivedfromRequirements:
    OSS-REQ-0122:Provenance
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    2.9.6SoftwareframeworkforLevel3catalogprocessing
    ID:DMS-REQ-0125
    Specification:TheDMSshallprovideasoftwareframeworkthatfacilitates
    ofcatalogs.Thisframeworkshallprovideameansforapplying
    catalogdata,includingmeasuringandensuringthecompleteness
    thatthespecifiedprocessingwasappliedtoallof,andonly,
    catalog(s).
    DerivedfromRequirements:
    DMS-REQ-0120:Level3DataProductSelfConsistency
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0122:Provenance
    2.9.7SoftwareframeworkforLevel3imageprocessing
    ID:DMS-REQ-0128
    Specification:TheDMSshallprovideasoftwareframeworkthatfacilitates
    ofimagedata.Thisframeworkshallprovideameansforapplying
    toimagedata,includingmeasuringandensuringthecompleteness
    thatthespecifiedprocessingwasappliedtoallof,andonly,
    dataset.
    DerivedfromRequirements:
    DMS-REQ-0120:Level3DataProductSelfConsistency
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0122:Provenance
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    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    3Software
    3.1SoftwareArchitecturetoEnableCommunityRe-Use
    ID:DMS-REQ-0308
    Specification:TheDMSsoftwarearchitectureshallbedesigned
    onhigh-performancecomputeplatforms,whilealsoenabling
    gorithmsbyscienceusersoncommoditydesktopcomputeplatforms.
    Discussion:Thehighdatavolumeandshortprocessingtimeline
    ticipatestheuseofhigh-performancecomputeinfrastructure,
    sciencealgorithmsimmediatelyapplicabletoscienceteams
    needforeasyinteroperabilitywithdesktopcomputeenvironments.
    DerivedfromRequirements:
    OSS-REQ-0121:OpenSource,OpenConfiguration
    3.2ApplicationsSoftware
    3.2.1SimulatedData
    ID:DMS-REQ-0009
    Specification:TheDMSshallprovidetheabilitytoinjectartificial
    productstoassessthefunctionalandtemporalperformance
    software.
    DerivedfromRequirements:
    DMS-REQ-0007:PipelineInfrastructure
    OSS-REQ-0351:DifferenceSourceSpuriousProbabilityMetric
    OSS-REQ-0353:DifferenceSourceSpuriousnessThreshold
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    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    OSS-REQ-0354:DifferenceSourceSpuriousnessThreshold
    3.2.2Pre-cursor,andRealData
    ID:DMS-REQ-0296
    Specification:TheDMSshallprovidefortheabilitytoprocess
    pixel-orientedastronomicalimagingcameras.
    Discussion:AcomparisonofDMSproductstothatproducedbysimilar
    camerasprovidesanessentialvalidationofDMSalgorithms
    3.2.3ImageDifferencing
    ID:DMS-REQ-0032
    Specification:TheDMSshallprovidesoftwaretoperformimage
    DifferenceExposuresfromthecomparisonofsingleexposures
    DerivedfromRequirements:
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0129:Exposures(Level1)
    3.2.4ProvideSourceDetectionSoftware
    ID:DMS-REQ-0033
    Specification:TheDMSshallprovidesoftwareforthedetection
    image,whichmaybeaDifferenceImageoraCo-Addimage.
    DerivedfromRequirements:
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    DMS-REQ-0080:DifferenceSourcesAvailablewithin24hours
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0130:Catalogs(Level1)
    OSS-REQ-0137:Catalogs(Level2)
    3.2.5ProvideCalibratedPhotometry
    ID:DMS-REQ-0043
    Specification:TheDMSshallprovidecalibratedphotometryineach
    allmeasuredentities(e.g.,DIASources,Sources,Objects),
    theequivalentflat-SEDsource,abovetheatmosphere.Fluxes,
    calculatedforallmeasuredentities.
    Discussion:NotethattheSEDisonlyassumedtobeflatwithin
    surement.
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    OSS-REQ-0130:Catalogs(Level1)
    OSS-REQ-0275:CalibrationProcessingPerformanceAllocations
    3.2.6ProvideAstrometricModel
    ID:DMS-REQ-0042
    Specification:Anastrometricmodelshallbeprovidedforevery
    specifiesatleastthepropermotionandparallax,andthe
    quantities.
    DerivedfromRequirements:
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    theirprovisionswaivedwithoutpriorapproval.
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    OSS-REQ-0149:Level1CatalogPrecision
    OSS-REQ-0153:WorldCoordinateSystemAccuracy
    OSS-REQ-0160:Level1DifferenceSource-DifferenceObject
    OSS-REQ-0162:Level2CatalogAccuracy
    3.2.7ProvideBeamProjectorCoordinateCalculationSoftware
    ID:DMS-REQ-0351
    Specification:TheDMSshallprovidesoftwaretorepresentthecoordinate
    relatingthecollimatedbeamprojectorpositionandtelescope
    tionpositiononthetelescopeopticalelementsandfocal
    3.2.8EnableaRangeofShapeMeasurementApproaches
    ID:DMS-REQ-0052
    Specification:TheDMSshallprovidefortheuseofavarietyof
    kindsofinputdatatomeasuresources:measurementoncoadds;
    usinginformation(e.g.,PSFs)extractedfromtheindividual
    onalltheinformationfromtheindividualExposuressimultaneously.
    Discussion:Themostappropriatemeasurementmodeltoapplydepends
    ofthecompositesource.
    DerivedfromRequirements:
    OSS-REQ-0137:Catalogs(Level2)
    3.2.9ProvideUserInterfaceServices
    ID:DMS-REQ-0160
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    Specification:TheDMSshallprovidesoftwareforUserInterface
    to:browseLSSTdataproductsthroughastronomicalviews
    ”best”imagesofselectableregionsofthesky;resample
    catalogcontent.
    DerivedfromRequirements:
    OSS-REQ-0057:ImageVisualization
    3.3MiddlewareSoftware
    3.3.1DMSInitializationComponent
    ID:DMS-REQ-0297
    Specification:TheDMSshallcontainacomponentthat,ateachCenter,
    Subsystemintoawell-definedsafestatewhenpoweredup.
    Discussion:Asafestateisonethatdoesnotpermitthecorruption
    archiveddata,norofsendingspuriousinformationover
    DerivedfromRequirements:
    OSS-REQ-0041:SubsystemActivation
    OSS-REQ-0307:SubsystemInitialization
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0122:Provenance
    3.3.2ProvideDataAccessServices
    ID:DMS-REQ-0155
    Discussion:(ThisisacompositerequirementintheSysMLmodel,
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    itschildren.)
    DerivedfromRequirements:
    OSS-REQ-0176:DataAccess
    3.3.2.1DataProductIngest
    ID:DMS-REQ-0299
    Specification:TheDMSshallprovidesoftwaretoingestdataproducts
    Archive.
    DerivedfromRequirements:
    OSS-REQ-0141:Storage
    OSS-REQ-0004:TheArchiveFacility
    3.3.2.2DataProductandRawDataAccess
    ID:DMS-REQ-0298
    Specification:TheDMSshallprovidesoftwareforDataAccessServices
    image,file,andcatalogdataproducts(includingrawtelescope
    theirassociatedmetadata,theirprovenance,oranycombination
    theiractualstoragelocation.
    DerivedfromRequirements:
    OSS-REQ-0176:DataAccess
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    3.3.2.3BulkDownloadService
    ID:DMS-REQ-0300
    Specification:TheDMSshallprovidesoftwaretoenablebulkdownload
    rawdata,subjecttonetworkbandwidth.
    Discussion:Thisincludesbulkdownloadofolderdatareleases.
    DerivedfromRequirements:
    OSS-REQ-0178:DataDistribution
    3.3.3ProvideImageAccessServices
    ID:DMS-REQ-0065
    Specification:TheDMSshallprovideaserviceforImageAccess
    accessprotocols,tosupportprogrammaticsearchandretrieval
    Theserviceshallsupportoneormorecommunitystandardformats,
    inputformat.
    Discussion:AtleasttheFITSimageformatwillbesupportedthough
    suchasSIAP.OtherimageformatssuchasJPGmaybemorecompatible
    outreachneeds.
    DerivedfromRequirements:
    DMS-REQ-0066:KeepExposureArchive
    OSS-REQ-0180:DataProductsQueryandDownloadAvailability
    OSS-REQ-0181:DataProductsQueryandDownloadInfrastructure
    OSS-REQ-0176:DataAccess
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    3.3.4ControlofLevel-1Production
    ID:DMS-REQ-0301
    Specification:TheDMSshallcontainacomponenttocontrolall
    duction.
    Discussion:Thisspecificallyaddressestheneedtocontrolthe
    DMSfacilities.
    DerivedfromRequirements:
    OSS-REQ-0044:StandardOperatingStates
    3.3.5ProvidePipelineExecutionServices
    ID:DMS-REQ-0156
    Discussion:(ThisisacompositerequirementintheSysMLmodel,
    itschildren.)
    DerivedfromRequirements:
    OSS-REQ-0037:ObservatoryControlSystemDefinition
    OSS-REQ-0117:AutomatedProduction
    3.3.5.1ProductionOrchestration
    ID:DMS-REQ-0302
    Specification:TheDMSshallprovidesoftwaretoorchestrateexecution
    cludingdeployingpipelinesonacomputingplatform.
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    DerivedfromRequirements:
    OSS-REQ-0004:TheArchiveFacility
    OSS-REQ-0038:ScopeofControl
    OSS-REQ-0117:AutomatedProduction
    3.3.5.2ProductionMonitoring
    ID:DMS-REQ-0303
    Specification:TheDMSshallprovidesoftwaretomonitorexecution
    DerivedfromRequirements:
    OSS-REQ-0004:TheArchiveFacility
    OSS-REQ-0038:ScopeofControl
    OSS-REQ-0034:SystemControl
    3.3.5.3ProductionFaultTolerance
    ID:DMS-REQ-0304
    Specification:TheDMSshallprovidesoftwaretodetectfaultsin
    coverwhenpossible.
    DerivedfromRequirements:
    OSS-REQ-0117:AutomatedProduction
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    3.3.6ProvidePipelineConstructionServices
    ID:DMS-REQ-0158
    Discussion:(ThisisacompositerequirementintheSysMLmodel,
    itschildren.)
    3.3.6.1TaskConfiguration
    ID:DMS-REQ-0306
    Specification:TheDMSshallprovidesoftwaretodefine,override
    thesuitabilityoftheconfigurationforatask.
    DerivedfromRequirements:
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0122:Provenance
    3.3.6.2TaskSpecification
    ID:DMS-REQ-0305
    Specification:TheDMSshallprovidesoftwaretodefine(andredefine
    apipelinetaskcontainingasciencealgorithm,whichmay
    othersubtasks.
    DerivedfromRequirements:
    OSS-REQ-0121:OpenSource,OpenConfiguration
    OSS-REQ-0122:Provenance
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    3.3.7UniqueProcessingCoverage
    ID:DMS-REQ-0307
    Specification:TheDMSshallenableapplicationstoprocessevery
    user-specifiedcriteriaexactlyonce.
    Commentary:The”exactlyonce”constraintcanbeconfusing
    benefitfromclarificationinthediscussion.
    DerivedfromRequirements:
    OSS-REQ-0120:Consistency
    OSS-REQ-0118:ConsistencyandCompleteness
    4Facilities
    4.1DataArchive
    4.1.1RawDataArchivingReliability
    ID:DMS-REQ-0309
    Specification:TheDMSsystemshallarchivealldata,includingscience,
    imagesandassociatedmetadata,thatarepresentedforarchiving
    arateofpermanentdatalossorcorruptionnottoexceeddataLossMax.
    Discussion:Data”presentedforarchiving”meansdatathathave
    ferredfromupstreamsystemstoDMS,andthatareintended
    obtainedfordiagnosticandotherlimited-useengineering
    fromthisrequirement.
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    DescriptionValueUnitName
    Maximumfractionofrawimagesthatarepermit-
    tedtobepermanentlylostorcorrupted,includ-
    ingthelossorcorruptionofessentialassociated
    metadata,onceacquiredbytheDMS.
    1.0e-5floatdataLossMax
    DerivedfromRequirements:
    OSS-REQ-0111:ScienceImageArchivingReliability
    4.1.2KeepHistoricalAlertArchive
    ID:DMS-REQ-0094
    Specification:TheDMSshallpreserveandkeepinanaccessible
    allissuedalertsforahistoricalrecordandforfalsealert
    DerivedfromRequirements:
    DMS-REQ-0092:AlertAttributes
    OSS-REQ-0128:Alerts
    4.1.3Un-ArchivedDataProductCache
    ID:DMS-REQ-0310
    Specification:TheDMSshallprovidelow-latencystorageforun-archived
    leastl1CacheLifetimetoenableefficientprecoveryandotherLevel-1
    ments.
    DescriptionValueUnitName
    Lifetimeinthecacheofun-archivedLevel-1data
    products.
    30dayl1CacheLifetime
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
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    DerivedfromRequirements:
    OSS-REQ-0130:Catalogs(Level1)
    4.1.4RegenerateUn-archivedDataProducts
    ID:DMS-REQ-0311
    Specification:TheDMSshallbeabletoregenerateunarchiveddata
    entificallyreasonabletolerances.
    Discussion:UnarchiveddataproductscurrentlyincludeProcessed
    visits,someCoadds,andDifferenceImages.Scientifically
    withintheformaluncertaintiesofthedataproduct,given
    ibrations,andcomputeplatform,allofwhichareexpected
    thecourseofthesurvey.
    DerivedfromRequirements:
    OSS-REQ-0129:Exposures(Level1)
    4.1.5Level1DataProductAccess
    ID:DMS-REQ-0312
    Specification:TheDMSshallmaintaina”live”Level1Database
    updatedasaresultofAlertProductionprocessing.
    DerivedfromRequirements:
    OSS-REQ-0127:Level1DataProductAvailability
    OSS-REQ-0185:TransientAlertQuery
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    4.1.6Level1&2CatalogAccess
    ID:DMS-REQ-0313
    Specification:TheDMSshallmaintainboththeLevel-2catalogand
    catalogfromthemostrecenttwoDataReleasesforquery
    Discussion:Thereisnorequirementforolderdatareleasesto
    DerivedfromRequirements:
    OSS-REQ-0186:AccesstoPreviousDataReleases
    4.1.7ProvideEngineering&FacilityDatabaseArchive
    ID:DMS-REQ-0102
    Specification:EngineeringandFacilitydatafromtheObservatory
    ciatedmetadatashallbepermanentlyarchivedbytheDMS
    withinL1PublicThoursoftheirgenerationbytheOCS.
    DescriptionValueUnitName
    Maximumtimefromtheacquisitionofscience
    datatothepublicreleaseofassociatedLevel1
    DataProducts(exceptalerts)
    24hourL1PublicT
    DerivedfromRequirements:
    OSS-REQ-0132:EngineeringandFacilityDatabaseArchive
    4.1.8CatalogQueries
    ID:DMS-REQ-0075
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    Specification:Thecatalogsshallbequeryablewithastructured
    Discussion:QueriesareexpectedtobegeneratedviaScienceUser
    withinandexternaltoDMS,includingVOclients.Thequeries
    mizedfor)thenativequerylanguageoftheDMSdatabase
    DerivedfromRequirements:
    DMS-REQ-0076:KeepScienceDataArchive
    OSS-REQ-0176:DataAccess
    4.1.9Loggingofcatalogqueries
    ID:DMS-REQ-0345
    Specification:EveryqueryofLSSTdatabasesshallbelogged.The
    leastthequeryitself,theuserwhosubmittedthequery,
    submitted,theexecutiontimeofthequery,andthenumber
    historyshallbeavailabletotheuserthatmadethequery
    onlyaccessiblebyadministrators.
    Discussion:Thelogscanbeusedforauditingincaseofadispute
    ing.Theycanalsobeusedbythedataaccessteamtolearn
    (suchasthetimesofday/monthwithhighload,orthemost
    statisticsforfocusingonfuturedevelopmentsandimprovements
    privatebydefault,inconjunctionwithDMS-REQ-0291,itwouldbedesirableforaquery
    publishedandassociatedwithaDOI.
    DerivedfromRequirements:
    OSS-REQ-0134:Level2DataProductAvailability
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    4.1.10ProvidingaPrecoveryService
    ID:DMS-REQ-0341
    Specification:A”precoveryservice”shallbeavailabletoend-users
    providedskylocationacrossallpreviousvisits,makingprecovery-
    ServiceElapsedhoursoftherequestandsupportingatleastprecoveryServicePeakUsers
    submissionsperhour.
    Discussion:Thisisforcedphotometryondifferenceimagesfrom
    awebinterfaceandscriptableAPIs.
    DescriptionValueUnitName
    Maximumtimebetweensubmittingarequestand
    receivingtheresults.
    24hourprecoveryServiceElapsed
    Minimumnumberofprecoveryserviceconnec-
    tionstobesupportedperhour.
    10integerprecoveryService-
    PeakUsers
    4.1.11CatalogExportFormats
    ID:DMS-REQ-0078
    Specification:TheDMScatalogarchiveshallprovidecatalogdata
    onrequestincommunitystandardformats:
    •Comma-separatedASCIItext
    •eXtensibleMarkupLanguage(XML)format,including
    http://www.ivoa.net/
    twiki/bin/view/IVOA/IvoaVOTable
    ), and
    •FITS tables.
    Derived from Requirements:
    DMS-REQ-0076: Keep Science Data Archive
    OSS-REQ-0176: Data Access
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    4.1.12 Maintain Archive Publicly Accessible
    ID:
    DMS-REQ-0077
    Specification:
    All releases of the DMS catalog archive shall be
    a publicly accessible state for the entire operational life
    Discussion:
    The scientific intent is satisfied by keeping data products
    release and the one prior available with low-latency, in
    lic. Earlier releases may be available from deep-store
    download by users.
    Derived from Requirements:
    DMS-REQ-0076: Keep Science Data Archive
    OSS-REQ-0186: Access to Previous Data Releases
    4.2 Computational Infrastructure
    4.2.1 Data Management Unscheduled Downtime
    ID:
    DMS-REQ-0318
    Specification:
    The Data Management subsystem shall be designed
    repair activities expected
    DMDowntime
    not
    days
    toper
    exceed
    year.
    Discussion:
    This requirement does not apply to DM’s alert publication
    cessing and user-interaction functionality, but only to
    collectionofsurveydata. Thereferencecasewouldbeafailure
    that lasted longer than the capacity of the Summit buffer
    the nominal buffer capacity by one day and therefore use up
    This requirement does not invoke the need to verify by reliability
    analysis that identifies likely hardware failures and identifies
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    time caused by those failures.
    Description
    Value
    Unit Name
    Unplanned downtime per year.
    1
    day
    DMDowntime
    Derived from Requirements:
    OSS-REQ-0373: Unscheduled Downtime Subsystem Allocations
    4.2.2 Optimization of Cost, Reliability and Availability
    ID:
    DMS-REQ-0161
    Specification:
    Within a fixed cost envelope for the Data Management
    tion of processing and storage facilities will optimize
    4.2.3 Compute Platform Heterogeneity
    ID:
    DMS-REQ-0314
    Specification:
    At any given LSST computational facility the DMS shall
    on a heterogeneous cluster of machines. The hardware, operating
    parameters shall be limited to a project-approved set.
    Discussion:
    The necessity of replacing hardware throughout the
    tially guarantees heterogeneity within a cluster.
    Derived from Requirements:
    OSS-REQ-0177: Data Access Environment
    OSS-REQ-0124: Software Development Standards
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    4.2.4 Pipeline Throughput
    ID:
    DMS-REQ-0162
    Specification:
    The infrastructure will be sized such that the net
    cessing pipelines will permit a complete processing of
    start of the next observing night, assuming no system outages
    Derived from Requirements:
    OSS-REQ-0127: Level 1 Data Product Availability
    OSS-REQ-0020: Usable Observing Time
    4.2.5 Pipeline Availability
    ID:
    DMS-REQ-0008
    Specification:
    Except in cases of major disaster, the DMS shall have
    of the DMS pipelines extending over
    productionMaxDowntime
    period greater
    . A
    than
    major disaster is defined as a natural disaster or act of war
    compromises or threatens to compromise the health and integrity
    computing equipment, or operational personnel.
    Discussion:
    This applies to active productions only. It is allowed
    down for longer periods during observatory scheduled maintenance,
    Production to be down during development and validation
    Description
    Value
    Unit Name
    Maximum allowable outage of active DM produc-
    tion.
    24
    hour productionMaxDowntime
    4.2.6 Re-processing Capacity
    ID:
    DMS-REQ-0163
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    their provisions waived without prior approval.
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    Specification:
    The DMS shall provide Processing, Storage, and Network
    of executing the DMS Data Release Production over all pre-existing
    greater
    drProcessingPeriod
    than
    , without impacting observatory operations.
    Description
    Value
    Unit Name
    Duration of the Data Release Production, includ-
    ing quality validation.
    1
    year drProcessingPeriod
    Derived from Requirements:
    OSS-REQ-0134: Level 2 Data Product Availability
    4.2.7 Temporary Storage for Communications Links
    ID:
    DMS-REQ-0164
    Specification:
    The infrastructure will provide for temporary
    temp-
    storage
    StorageRelMTTR
    of the mean time to repair of any communications
    source end of that link.
    Description
    Value
    Unit Name
    Temporary storage required relative to network
    Mean Time to Repair.
    200 percent
    tempStorageRelMTTR
    Derived from Requirements:
    DMS-REQ-0162
    : Pipeline Throughput
    4.2.8 Infrastructure Sizing for ”catching up”
    ID:
    DMS-REQ-0165
    Specification:
    The infrastructure will be sized such that after
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    of the temporarily stored raw image data may occur at the
    processed per day, without interrupting the current day’s
    Derived from Requirements:
    DMS-REQ-0162
    : Pipeline Throughput
    OSS-REQ-0050: Summit Power Grid Loss
    OSS-REQ-0051: Summit-Base Connectivity Loss
    OSS-REQ-0052: Summit Data Buffer
    4.2.9 Incorporate Fault-Tolerance
    ID:
    DMS-REQ-0166
    Specification:
    The infrastructure will incorporate as fault-tolerance
    of data in the event of hardware or software failure.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    4.2.10 Incorporate Autonomics
    ID:
    DMS-REQ-0167
    Specification:
    The infrastructure will incorporate sufficient capability
    recovery to provide for continuation of processing in the
    failures.
    Discussion:
    It is understood that the system performance may degrade
    bers of failures.
    Derived from Requirements:
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    DMS-REQ-0166
    : Incorporate Fault-Tolerance
    4.3 Summit Facility
    4.3.1 Summit Facility Data Communications
    ID:
    DMS-REQ-0168
    Specification:
    The DMS shall provide data communications infrastructure
    data and associated metadata read-outs, and the collection
    for transfer to the base facility.
    Derived from Requirements:
    OSS-REQ-0002: The Summit Facility
    4.3.2 Prefer Computing and Storage Down
    ID:
    DMS-REQ-0170
    Specification:
    The DMS computing and storage equipment will be preferentially
    lower altitude Facility (Base or Archive Center) versus the
    costs and fewer reliability issues. Therefore any processing
    will be allocated to a lower altitude Facility.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    4.3.3 DMS Communication with OCS
    ID:
    DMS-REQ-0315
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    Specification:
    The DMS at the Base Site shall contain a component
    mands from and communicate with the OCS.
    Derived from Requirements:
    OSS-REQ-0003: The Base Facility
    4.4 Summit to Base
    4.4.1 Summit to Base Network
    ID:
    DMS-REQ-0171
    Specification:
    The DMS shall provide communications infrastructure
    Facility and the Base Facility sufficient to carry scientific
    each image in no more
    summToBaseMaxTransferTime
    than time
    .
    Description
    Value
    Unit Name
    Maximum time interval to transfer a full Crosstalk
    Corrected Exposure and all related metadata from
    the Summit Facility to the Base facility.
    2
    secondsummToBaseMaxTrans-
    ferTime
    Derived from Requirements:
    OSS-REQ-0003: The Base Facility
    OSS-REQ-0127: Level 1 Data Product Availability
    4.4.2 Summit to Base Network Availability
    ID:
    DMS-REQ-0172
    Specification:
    The Summit to Base communications shall be highly
    Between Failures
    summToBaseNetMTBF
    (MTBF) > .
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    their provisions waived without prior approval.
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    Description
    Value
    Unit Name
    Mean time between failures, measured over a 1-yr
    period.
    90
    day
    summToBaseNetMTBF
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0373: Unscheduled Downtime Subsystem Allocations
    4.4.3 Summit to Base Network Reliability
    ID:
    DMS-REQ-0173
    Specification:
    The Summit to Base communications shall be highly
    to Repair (MTTR)
    summToBaseNetMTTR
    <
    .
    Description
    Value
    Unit Name
    Mean time to repair, measured
    24over
    hour
    a 1-yr
    summToBaseNetMTTR
    period.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0373: Unscheduled Downtime Subsystem Allocations
    4.4.4 Summit to Base Network Secondary Link
    ID:
    DMS-REQ-0174
    Specification:
    The Summit to Base communications shall provide
    or transport mechanism for minimal operations support in
    This link may include redundant fiber optics, microwaves,
    capable of transferring one night’s
    summToBaseNet2TransMax
    worth of raw
    or less.
    data in
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    Description
    Value
    Unit Name
    Maximum time to transfer one night of data via
    the network secondary link.
    72
    hour summTo-
    BaseNet2TransMax
    Derived from Requirements:
    DMS-REQ-0172
    : Summit to Base Network Availability
    DMS-REQ-0173
    : Summit to Base Network Reliability
    OSS-REQ-0049: Degraded Operational States
    4.4.5 Summit to Base Network Ownership and Operation
    ID:
    DMS-REQ-0175
    Specification:
    The Summit to Base communications link shall be
    LSST and/or the operations entity to ensure responsiveness
    Derived from Requirements:
    DMS-REQ-0173
    : Summit to Base Network Reliability
    DMS-REQ-0172
    : Summit to Base Network Availability
    OSS-REQ-0036: Local Autonomous Administration of System
    4.5 Base Facility
    4.5.1 Base Facility Infrastructure
    ID:
    DMS-REQ-0176
    Specification:
    The Base Facility shall provide sufficient computing,
    frastructure to support buffering and forwarding of all raw
    to the Archive Facility, a complete copy of the Archive Facility
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    cilities to support Commissioning activities.
    Discussion:
    The Base Facility is co-located with the Chilean DAC,
    for the Archive Center in the event of disaster.
    Derived from Requirements:
    OSS-REQ-0003: The Base Facility
    4.5.2 Base Facility Temporary Storage
    ID:
    DMS-REQ-0177
    Specification:
    The Base Facility shall
    minBaseDataStorage
    provide at least
    (or half
    time
    of
    that amount, redundantly) of raw data storage in the event
    outage.
    Description
    Value
    Unit Name
    Low-latency storage buffer capacity, expressed in
    units of data volume equivalent for a typical day’s
    data collection.
    14
    day
    minBaseDataStorage
    Derived from Requirements:
    DMS-REQ-0164
    : Temporary Storage for Communications Links
    OSS-REQ-0053: Base-Archive Connectivity Loss
    OSS-REQ-0054: Base Data Buffer
    4.5.3 Base Facility Co-Location with Existing Facility
    ID:
    DMS-REQ-0178
    Specification:
    The Base Facility shall be co-located at an existing
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    support and facility resources
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0006: Sites
    4.5.4 Commissioning Cluster
    ID:
    DMS-REQ-0316
    Specification:
    The Base Facility shall include a compute cluster
    Systems Engineering group for use in commissioning. Data
    or otherwise maintain this cluster following hardware installation.
    shall be
    budgetRelAlertProd
    at least
    of the budget for Alert Production hardware.
    Description
    Value
    Unit Name
    Budget relative to the cost of the Alert Production
    system.
    10
    percent
    budgetRelAlertProd
    4.5.5 Base Wireless LAN (WiFi)
    ID:
    DMS-REQ-0352
    Specification:
    The Base LAN shall
    minBaseWiFi
    provide
    Wireless LAN (WiFi) and Wireless
    Access Points in the Base Facility to support connectivity
    network backbones.
    Description
    Value
    Unit Name
    Maximum allowable outage of active DM produc-
    tion.
    1000megabit
    per
    second
    minBaseWifi
    Derived from Requirements:
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    OSS-REQ-0003: The Base Facility
    4.6 Base to Archive
    4.6.1 Base to Archive Network
    ID:
    DMS-REQ-0180
    Specification:
    The DMS shall provide communications infrastructure
    ity and the Archive Center sufficient to carry scientific data
    image in no more
    baseToArchiveMaxTransferTime
    than time
    .
    Description
    Value
    Unit Name
    Maximum time interval to transfer a full Crosstalk
    Corrected Exposure and all related metadata from
    the Base Facility to the Archive Center.
    5
    secondbaseToArchiveMaxTrans-
    ferTime
    Derived from Requirements:
    DMS-REQ-0162
    : Pipeline Throughput
    OSS-REQ-0053: Base-Archive Connectivity Loss
    OSS-REQ-0055: Base Updating from Archive
    4.6.2 Base to Archive Network Availability
    ID:
    DMS-REQ-0181
    Specification:
    The Base to Archive communications shall be highly
    baseToArchNetMTBF
    .
    Description
    Value
    Unit Name
    Mean time between failures, measured over a 1-yr
    period.
    180 day
    baseToArchNetMTBF
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    DMS-REQ-0162
    : Pipeline Throughput
    OSS-REQ-0053: Base-Archive Connectivity Loss
    4.6.3 Base to Archive Network Reliability
    ID:
    DMS-REQ-0182
    Specification:
    The Base to Archive communications shall
    base-
    be highly
    ToArchNetMTTR
    .
    Description
    Value
    Unit Name
    Mean time to repair, measured
    48over
    hour
    a 1-yr
    baseToArchNetMTTR
    period.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0053: Base-Archive Connectivity Loss
    4.6.4 Base to Archive Network Secondary Link
    ID:
    DMS-REQ-0183
    Specification:
    The Base to Archive communications shall provide
    mechanism (e.g. protected circuit) for operations support
    tended outage. This secondary link shall be capable of ”bursting”
    of the primary link.
    Derived from Requirements:
    DMS-REQ-0182
    : Base to Archive Network Reliability
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    DMS-REQ-0181
    : Base to Archive Network Availability
    OSS-REQ-0049: Degraded Operational States
    4.7 Archive Center
    4.7.1 Archive Center
    ID:
    DMS-REQ-0185
    Specification:
    The Archive Center shall provide computing, storage,
    ture to support, simultaneously: nightly processing including
    sociation, and moving object pipelines, and the generation
    i.e. alerts; the data release production, including Level-2
    storage for all data products (with provenance), including
    serve data for replication to data centers and end user sites.
    Derived from Requirements:
    DMS-REQ-0163
    : Re-processing Capacity
    OSS-REQ-0004: The Archive Facility
    4.7.2 Archive Center Disaster Recovery
    ID:
    DMS-REQ-0186
    Specification:
    The Archive Center shall provide disaster recovery
    LSST data in the case of infrastructure or facility-threatening
    recovery of all LSST archived data from backed up sources,
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0176: Data Access
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    4.7.3 Archive Center Co-Location with Existing Facility
    ID:
    DMS-REQ-0187
    Specification:
    The Archive Center shall be hosted at an existing
    puting center.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    OSS-REQ-0022: Archive Site
    4.8 Archive to Data Access Center
    4.8.1 Archive to Data Access Center Network
    ID:
    DMS-REQ-0188
    Specification:
    The DMS shall provide communications infrastructure
    Center and Data Access Centers sufficient to carry scientific
    in support of community and EPO access. Aggregate bandwidth
    Archive Center to Data Centers
    archToDacBandwidth
    shall be
    . at least
    Description
    Value
    Unit Name
    Aggregate bandwidth capacity for data transfers
    between the Archive and Data Access Centers.
    10000
    megabit
    per
    second
    archToDacBandwidth
    4.8.2 Archive to Data Access Center Network Availability
    ID:
    DMS-REQ-0189
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    Specification:
    The Archive to Data Access Center communications
    with
    archToDacNetMTBF
    >
    .
    Description
    Value
    Unit Name
    Mean Time Between Failures for data service be-
    tween Archive and DACs, averaged over a one-
    year period.
    180 day
    archToDacNetMTBF
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    4.8.3 Archive to Data Access Center Network Reliability
    ID:
    DMS-REQ-0190
    Specification:
    The Archive to Data Access Center communications
    with
    archToDacNetMTTR
    <
    .
    Description
    Value
    Unit Name
    Mean time to repair, measured
    48over
    hour
    a 1-yr
    archToDacNetMTTR
    period.
    Derived from Requirements:
    DMS-REQ-0161
    : Optimization of Cost, Reliability and Availability
    4.8.4 Archive to Data Access Center Network Secondary Link
    ID:
    DMS-REQ-0191
    Specification:
    The Archive to Data Access Center communications
    link or transport mechanism (e.g. protected circuit) for
    the event of extended outage.
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    Derived from Requirements:
    DMS-REQ-0189
    : Archive to Data Access Center Network Availability
    DMS-REQ-0190
    : Archive to Data Access Center Network Reliability
    4.9 Data Access Center
    4.9.1 Data Access Centers
    ID:
    DMS-REQ-0193
    Specification:
    The Data Access Centers shall provide computing,
    frastructure to support open access to LSST data products
    Derived from Requirements:
    OSS-REQ-0004: The Archive Facility
    4.9.2 Data Access Center Simultaneous Connections
    ID:
    DMS-REQ-0194
    Specification:
    At least
    dacMinConnections
    simultaneous connections shall be
    each Data Access Center.
    Description
    Value
    Unit Name
    Minimumsimultaneousconnectionstoend-users.
    300 integer
    dacMinConnections
    4.9.3 Access to catalogs for external Level 3 processing
    ID:
    DMS-REQ-0122
    Specification:
    The DMS shall facilitate Level 3 catalog processing
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    ternal facilities outside the DACs. This will principally
    and the provision of tools for maintaining and validating
    Derived from Requirements:
    OSS-REQ-0140: Production
    OSS-REQ-0180: Data Products Query and Download Availability
    4.9.4 Access to images for external Level 3 processing
    ID:
    DMS-REQ-0126
    Specification:
    The DMS shall facilitate Level 3 image processing
    ternal facilities outside the DACs. This will principally
    datasets and the provision of tools for maintaining and validating
    Derived from Requirements:
    OSS-REQ-0140: Production
    OSS-REQ-0180: Data Products Query and Download Availability
    4.9.5 Access to input catalogs for DAC-based Level 3 processing
    ID:
    DMS-REQ-0123
    Specification:
    The DMS shall provide access to all Level 1 and Level
    the LSST project’s Data Access Centers, and any others that
    for Level 3 processing that takes place at the DACs.
    Derived from Requirements:
    OSS-REQ-0140: Production
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    4.9.6 Access to input images for DAC-based Level 3 processing
    ID:
    DMS-REQ-0127
    Specification:
    The DMS shall provide access to all Level 1 and Level
    the LSST project’s Data Access Centers, and any others that
    for Level 3 processing that takes place at the DACs.
    Derived from Requirements:
    OSS-REQ-0140: Production
    4.9.7 Federation with external catalogs
    ID:
    DMS-REQ-0124
    Specification:
    The DMS shall provide a means for federating Level
    externally provided catalogs, for joint analysis. The DMS
    external data must be provided in order for this to be achieved.
    port community standards in this regard, including, but
    facilities that may be available during the project lifetime.
    Derived from Requirements:
    DMS-REQ-0125
    : Software framework for Level 3 catalog processing
    OSS-REQ-0140: Production
    4.9.8 Data Access Center Geographical Distribution
    ID:
    DMS-REQ-0196
    Specification:
    The Data Access Centers will be hosted at facilities
    U.S. and the observatory host country to permit widest possible
    The contents of this document are subject to configuration control and may
    their provisions waived without prior approval.
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    fewest possible network hops.
    Derived from Requirements:
    DMS-REQ-0193
    : Data Access Centers
    OSS-REQ-0021: Base Site
    OSS-REQ-0022: Archive Site
    4.9.9 No Limit on Data Access Centers
    ID:
    DMS-REQ-0197
    Specification:
    The number of Data Access Centers shall be limited
    or external funding. No architectural constraints will
    addition of Data Access Centers at any time, subject to funding.
    Derived from Requirements:
    DMS-REQ-0193
    : Data Access Centers
    OSS-REQ-0021: Base Site
    OSS-REQ-0022: Archive Site
    References
    [1]
    [LSE-39]
    , Claver, C., Dubois-Felsmann,
    LSST Document
    ,LSE-39,URLhttps:
    G.,
    Tree
    2010,
    //ls.st/LSE-39
    [2][LSE-29],Claver,C.F.,TheLSSTSystemsEngineeringIntegrated
    SystemRequirements,LSE-29,URLhttps://ls.st/LSE-29
    [3][LSE-30],Claver,C.F.,TheLSSTSystemsEngineeringIntegrated
    SystemRequirements,LSE-30,URLhttps://ls.st/LSE-30
    [4][LSE-69],Dubois-Felsmann,G.,2014,InterfacebetweentheCameraandData,
    LSE-69,URLhttps://ls.st/LSE-69
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    85

    LARGESYNOPTICSURVEYTELESCOPE
    DataManagementSystem(DMS)RequirementsLSE-61LatestRevision2017-06-30
    [5][LSE-68],Dubois-Felsmann,G.,2015,CameraDataAcquisitionInterface,LSE-68,URLhttps:
    //ls.st/LSE-68
    [6][LPM-17],Ivezić,Ž.,TheLSSTScienceCollaboration,2011,LSSTScienceRequirements
    ument,LPM-17,URLhttps://ls.st/LPM-17
    [7][LSE-131],Jacoby,S.,Emmons,B.,Selvy,B.,2017,InterfacebetweenDataManagement
    EducationandPublicOutreach,LSE-131,URLhttps://ls.st/LSE-131
    [8][LSE-163],Juric,M.,etal.,2017,LSSTDataProductsDefinitionDocument,LSE-163,URL
    https://ls.st/LSE-163
    Thecontentsofthisdocumentaresubjecttoconfigurationcontrolandmay
    theirprovisionswaivedwithoutpriorapproval.
    86

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