MOD17UsersGuide_精品文档.pdf

MOD17UsersGuide_精品文档.pdf

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UsersGuideGPPandNPP（MOD17A2/A3）ProductsNASAMODISLandAlgorithmFaithAnnHeinschMattReevesPetrVotavaSinkyuKangCristinaMilesiMaoshengZhaoJosephGlassyWilliamM.JollyRachelLoehmanChadF.BowkerJohnS.KimballRamakrishnaR.NemaniStevenW.RunningGrossPrimaryProduction（GPP）1-kmMODISimageGlobalGPPimagecreatedbyAndrewNeuschwander.Version2.0,December2,2003MOD17UsersGuideMODISLandTeamVersion2.0,12/2/2003Page2of57Thispageintentionallyleftblank.MOD17UsersGuideMODISLandTeamVersion2.0,12/2/2003Page3of57TableofContentsSynopsis8CHAPTERI.THEMODISALGORITHM1.TheAlgorithm,Background,andOverview81.1Estimatingvegetativeproductivityfromabsorbedradiation81.2TheBiophysicalVariabilityof91.3TheMOD17A2/MOD17A3algorithmlogic112.SimplifyingAssumptionsforGlobalApplicability162.1TheBPLUTandconstantbiomeproperties162.2Leafareaindexandfractionofabsorbedphotosyntheticallyactiveradiation162.3DAOdailymeteorologicaldata183.DependenceonMODISLandCoverClassification（MOD12Q1）184.PracticalConsiderationsforProcessingandUseofMODISData204.1MODIStileprojectioncharacteristics204.2FileformatofMOD17endproducts214.3Datasetcharacteristics264.4LinkstoMODIS-friendlytools265.DataCollectionHistory286.QualityAssurance286.1GPPandNPPQualityAssuranceVariableScheme306.2Identifyingnon-terrestrialfillvaluesintheGPP/NPPdataproducts307.MissingData338.UsefulnessofDataforAnsweringResearchQuestions339.ConsiderationsforMOD17A2ProductImprovement349.1Fillingmodelvaluesforcloudypixels349.2Datacompositing359.3Landcover35CHAPTERII.PROPOSEDIMPROVEMENTSTOTHECOLLECTION4ALGORITHM1.Introduction372.ProblemswithCollection4MOD17373.ImprovementsfromCollection4toCollection4.5384.AdditionofAnnualGPPandQCtoCollection4.5MOD17A3425.FinalBPLUTappliedtoCollection4.5MOD17426.Results42CHAPTERIII.ORDERINGMOD17A2DATA1.NamingConventions432.LoggingintotheEDG433.SearchingtheData443.1EDGsearchpage443.2SearchinProgresspage463.3Granulelistingpage473.4Disclaimerpage48MOD17UsersGuideMODISLandTeamVersion2.0,12/2/2003Page4of57TableofContents（cont.）4.OrderingtheData494.1Orderingoptionspage494.2Orderingoptionspage（partII）494.3Orderform524.4Reviewingyourorder（Step3）534.5Submittingtheorder535.TheDataPool54MODISFAQs55REFERENCES56MOD17UsersGuideMODISLandTeamVersion2.0,12/2/2003Page5of57ListofFiguresFig.CaptionPageCHAPTERI.1.1FlowchartsshowingthelogicbehindtheMOD17Algorithmincalculatingboth（a）8-dayaverageGPPand（b）annualNPP.101.2TheTMINandVPDattenuationscalarsaresimplelinearrampfunctionsofdailyTMINandVPD.122.1ThelinkagesamongMODISlandproducts.162.2ComparisonsofDAOandobservedmeteorologicaldata.194.1MODIStilingsystem.Anylocationontheearthcanbespatiallyreferencedusingthehorizontal（H）andvertical（V）designators.Eachtileis1200x1200kilometers.276.1AdiagramforahypotheticalMOD17A2qualityassurancevalueof4.309.1AschematicdiagramillustratingtheprocessofspatialandtemporalinterpolationusinginformationfromlandcoverandQAflags.Inthisexample,thelandcovermaphasonlytwovalues（darkanddashedones）.Inthebottomwindows,darkpixelsarecloudypixels,andwhitepixelsarethosewiththebestQAconditions.Thethick-borderedpixelsarethepixelsselectedafterfiltering.Intemporalfilling,datafromthepreviousweekisusedtofillMOD15orMOD17A2.349.5MergingMODISproductivitydatawithhigh-resolutionLandSat（TM）Data.36CHAPTERII.2.1Comparisonoftemporalprofilesof2001Collection4MOD15A2withoriginalvalues（FPAR_noQc,LAI_noQc）andtemporallylinearly-filledFPARandLAI（FPAR_filling,LAI_filling）,andoftemporalprofilesofMOD17A2withoriginalMOD15A2inputs（GPP_noQc,PSN_noQc）,andMOD17A2withfilledMOD15A2（GPP_filling,PSN_filling）.ThepixelislocatedintheAmazonrainforest（lat=-1.0,lon=-60）withtheMODISlandcoverEvergreenBroadleafForest（EBF）.392.2ComparisonofCollection4andCollection4.5MOD17A2GPP（compositeperiod241）andMOD17A3NPPfor2001.403.1Distributionofmorethan5,000WMOstationsfor2001and2002.413.2PercentofWMOstationswithchangesinRMSEandCORbetweenspatiallyinterpolatedandnon-interpolatedDAO.Formoststations,DAOaccuraciesareimproved（reducedRMSEandincreasedCOR）asaresultofspatialinterpolation.41MOD17UsersGuideMODISLandTeamVersion2.0,12/2/2003Page6of57ListofFigures（cont.）CHAPTERIII.1.1TheMOD17A2StandardProductnamingconvention.432.1TheEDGhomepage.443.1TheEDGsearchpage.453.2Choosingthetimerange.463.3The“Searchinprogress”page.473.4Thepagelistingthegranulesyouhaverequested.483.5Thedisclaimer.494.1Choosingorderingoptions.504.2Choo