landsat-sentinel constellation for regular monitoring of ...€¦ · nima pahlevan, sudipta sarkar,...

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