Landsat-Sentinelconstellationforregularmonitoringofglobalwaterquality:
currentstatus&futureneeds
NimaPahlevan,SudiptaSarkar,SandeepChittimalli,and
SundarabalanBalasubramanian(Code619)
BryanFranz&SeanBaily(Code616)
NASAGoddardSpaceFlightCenter
Aquaticscience/application
•Wherearewenow?
Aquaticscience/application
•Wherearewenow?•Wherewouldwewanttobe?
Wherearewenow?
• Landsat-8(OLI)Vs.Sentinel-2(MSI)
Rrs Products(viaSeaDAS):Validation
AERONET-OCradiometricdata
Rrs Products(viaSeaDAS):Validation
Rrs (Landsat-8) [1/sr]
Pahlevan,N.,Sarkar,S.,Franz,B.A.,He,J.“Sentinel-2MultiSpectralInstrument(MSI)dataprocessingforaquaticscienceapplications:Demonstrationsandpreliminaryvalidations”.SubmittedtoRemoteSensingofEnvironment
Pahlevan,N.,Schott,J.R.,Franz,B.A.,Zibordi,G.,Markham,B.,Bailey,S.,Schaaf,C.B.,Ondrusek,M.,Greb,S.,&Strait,C.M.(2017).Landsat8remotesensingreflectance(Rrs)products:Evaluations,intercomparisons,andenhancements.RemoteSensingofEnvironment,190,289-301
Landsat-8(OLI) Sentinel-2A(MSI)
RMSD(1/sr)0.00090.00080.00070.0004
N=90 N=35
AERONET-OCradiometricdata
Relativeradiometricperformance:PreliminaryOLI-MSIIntercomparisons@TOA
Relativeradiometricperformance:PreliminaryOLI-MSIIntercomparisons@TOA• Usenearsimultaneousoverpasses(n~40with20-25mintimedifference)
• Note:OLIisvicariouslycalibrated
Pahlevan,N.,Schott,J.R.,Franz,B.A.,Zibordi,G.,Markham,B.,Bailey,S.,Schaaf,C.B.,Ondrusek,M.,Greb,S.,&Strait,C.M.(2017).Landsat8remotesensingreflectance(Rrs)products:Evaluations,intercomparisons,andenhancements.RemoteSensingofEnvironment,190,289-301
Landsat-Sentinel-2near-simultaneousimageproducts
NorthernMediterraneanSea:Saint-Laurent-du-var
negative(invalid)retrievals
GrandLake(Louisiana)
RatzeburgerSee(Germany)
Differencesinoverallbrightness
Aftervicariouscalibration
Bluebands
Signal-to-noiseratio(SNR)
0
100
200
300
400
500
600
444 497 560 664 704 740 783 843 865
SNR
MSIbandcenter(nm)
SNR(MSI)
SNR(OLI)
Morescienceworkneeded
• ImproveatmosphericcorrectionimplementedinSeaDAS• Developmentofproducts(e.g.,HABs,TSS,Chlorophyll-a,turbidity,clarity)• ConsistentforL8+S2
• Uncertaintymetrics
Wherewouldwewanttobe?
Wherewouldwewanttobe?
Whousestheseproducts??
Wherewouldwewanttobe?
Justafewofus!
EPA?DNR?Waterauthorities?
Whousestheseproducts??
Anearreal-time(NRT)warningsystemforwaterqualitymonitoring
WebinterfaceFiredetected
Minimaltrainingneededforendusers(EPA,DNR,water
authorities,etc.)
Anearreal-time(NRT)warningsystemforwaterqualitymonitoring
Landsat-8+Sentinel-2products
(e.g.,totalsuspendedsolids)
Enduserreceivesanalarmwhenan
anomalyisdetectedwithinhis/herregionof
interest.
Frontend:Webinterface
Backend:Anomalydetection
NRTprocessingofLandsat-8+Sentinle-2
Pull&StoredataMinimaltrainingneededforendusers(EPA,DNR,water
authorities,etc.)
Anearreal-time(NRT)warningsystemforwaterqualitymonitoring
Plans&Ongoingactivities
• Locatesourcesoffunding• NASA’sAppliedScienceProgram(ASP)
• LookforpartnersinwesternStates
Plans&Ongoingactivities
• Locatesourcesoffunding• NASA’sAppliedScienceProgram(ASP)
• LookforpartnersinwesternStates
• InitialdevelopmentandtestingforselectinlandwatersinUS
Plans&Ongoingactivities
• Locatesourcesoffunding• NASA’sAppliedScienceProgram(ASP)
• LookforpartnersinwesternStates
• InitialdevelopmentandtestingforselectinlandwatersinUS• Datastorage&processingatUSGSEROS?orGoddard?or AmazonWebServices?• Frontend:webinterfacedevelopments• Backend:anomalydetection
Plans&Ongoingactivities
• Locatesourcesoffunding• NASA’sAppliedScienceProgram(ASP)
• LookforpartnersinwesternStates
• InitialdevelopmentandtestingforselectinlandwatersinUS• Datastorage&processingatUSGSEROS?orGoddard?or AmazonWebServices?• Frontend:webinterfacedevelopments• Backend:anomalydetection• Reachout
• EnduserworkshopatGoddard:Towardsasatellite-basednearreal-timemonitoringsystemforwaterquality.https://www.dropbox.com/s/43kcoj153cnmxs5/GSFC_WQ_Workshop_Final_Announcement%20.pdf?dl=0
• AGUSession:ImpactsofLandSurfaceDynamicsonWaterQuality:End-to-EndRemoteSensing&ModelingApproach https://agu.confex.com/agu/fm17/preliminaryview.cgi/Session24060