Landsat 8 OLI and TIRS Calibraon Updates and Trends for ...
Transcript of Landsat 8 OLI and TIRS Calibraon Updates and Trends for ...
Aug242017The26thConferenceonCharacteriza8onandRadiometric
Calibra8onforRemoteSensing(CALCON) 1
Landsat8OLIandTIRSCalibra3onUpdatesandTrendsforthePeriod
of4YearofOpera3onRavivLevy,JuliaBarsi,BrianMarkham
Specialthanksto:LawrenceOng,MaJMontanaro,AaronGerace,USGScalvalCrew(RonMorfiJ,EsadMicijevic,CodyAnderson),VicariousCalgroups(UofA:JeffCzapla-MyersandNikAnderson,SDSU:MorakotKaewmanee,LarryLeigh,DennisHelder,RIT:Nina
RaquenoJPL:SimonHook)
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Outline• Background– Whathadhappenedsofar– On-orbitcalibra3onsmethods
• OLI–trends– Rela3vegains– Absolutegains
• TIRS–trends– Absolutegains– Calibra3onError–latestresults
• Newuniformityevalua3onmethodforOLIandTIRS• Summaryandfuturework
Aug242017The26thConferenceonCharacteriza8onandRadiometric
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Background• OLIisinthemiddleofits4thyearinorbit• TIRSpasseditsofficialdesignlife3meby1.5years• NoChangestoSNRperformance• Wereportedduringthisperiodabout:
– 6updatestoUSGSLandsatGroundProcessingSystem– 14Calibra3onNo3cespublishedintheUSGSsite(onlyabout⅓ofthoseimpactradiometricupdates)– 2safeholdsevents– 1majorhardwareissue(notincludingstraylight)24calibra3onparametersreleasesinaperiodof18quartersOnMay312017theobservatorypassedthe1stMillionscenes.
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Subsetofmajorevents• 2013events
– 1stSafeholdSep192013(ahtudecontrolanomalyfollowingSpecialLunarcollects)– OLIandTIRScalibra3onupdates– TIRSoffsetupdate
• 2014events– 2ndSafeholdApril292014(ahtudecontrolanomalyfollowingSpecialSolarDiffusercollectduringannular
eclipse)– Increasetonumberofscenecollectedperday– TIRSSSMencoderelectronicscurrentissueisdiscovered(SideA)– Radgainsupdate–reanalysisofprelaunchdataandshiiingtoReflectancebasedcalibra3onforOLI– TIRSBiasstraylight1stcorrec3onaJempt–applyingfixedoffsetcorrec3on.
• 2015events– March2TIRSelectronicschangedtoSideBforcingCPFupdatetorecalibrateTIRSinApril– Calibra3onupdate–mainlytochangeandrevalidateTIRSsideBparameters.– Oct-NovTIRSSSMencoderissuerepeatsinSideBforcingchangetonominalopera3onconceptofTIRS–impac3ngcalibra3onsdutycycle
• 2016&2017events– Noon-orbiteventsmainlyprocessingupdated– Collec3on-1updates(CA,BluebandsarecorrectedfortrendinresponseandnewTIRSstraylightcorrec3on)– March2017en3rearchiveisprocessedwithCollec3on-1processing.
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On-orbitcalibra3onTheresourcesare:InstrumentBuild-in
OLI– SolarDiffuser(Absolute,Uniformity,Non-linearity,Stability)– Lamp(Dailytrendofrela3vechanges)– ShuJer(offsetcorrec3ons)
TIRS– Blackbody(trackchangestoAbsolute,Stability,Uniformity,Non-linearity)– Spaceview(offsetcorrec3ons)
Externalobserva3ons:– Lunar(monthlytrendofrela3vechanges,Straylight,contamina3on)– Vicarious–Calsites(automated+/-4%err)– PIC-Sites– Allearth-collectsarchive(HistogramandOverlapstatsanalysis)– Otherspecialcollects
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OLIOn-orbitshorttermstability• Variabilityover3meforallbands
00.010.020.030.040.05
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
variability[%
]
timesincelaunch[years]
RelativeGainVariabilityBetweenConsecutiveDiffuserAcquisitions
CA Blue Green Red NIR SWIR1 SWIR2 Cirrus Pan
PlotcourtesyofJuliaBarsi
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OLIOn-boardcalibratortrends:CA
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Respon
seRela*
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TimeSinceLaunch[years]
OLICABand1Trends:BandAverage
s,mlamp(working) s,mlamp(backup) s,mlamp(pris,ne) solarpanel(working) solarpanel(pris,ne) lunar GainModel
PlotcourtesyofJuliaBarsi
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OLIOn-boardcalibratortrends:Blue
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OLIBlueBand2Trends:BandAverage
s,mlamp(working) s,mlamp(backup) s,mlamp(pris,ne) solar(working) solarpanel(pris,ne) lunar GainModel
PlotcourtesyofJuliaBarsi
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OLIOn-boardcalibratortrends:SWIR2
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OLISWIR2Band7Trends:BandAverage
s,mlamp(working) s,mlamp(backup) s,mlamp(pris,ne) solar(working) solarpanel(pris,ne) Lunar
PlotcourtesyofJuliaBarsi
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OLIVicariousCalibra3on• UniversityofArizonaRadCaTSmeasurementsofRailroadValley(±4%)• SouthDakotaStateUniversitymeasurementsoflargegrassfieldin
Brookings,SD(±7%)
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RatioofTOASpectralRadiance
(measured/OLI)
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OLIVicariousResultsRe=lectanceCalibration
RadCaTS/OLI(13) SDSU/OLI(20)
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RatioofTOASpectralRadiance
(measured/OLI)
Band
OLIVicariousResultsSpectralRadianceCalibration
RadCaTS/OLI(13) SDSU/OLI(20)
PlotcourtesyofJuliaBarsi,JeffCzapla-Myers,MorakotKaewmanee
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TIRSLongTermStability:Responsivity• Instrumentresponsivitycalculatedfromblackbodyand
deepspaceacquisi3ons• Responsivityindicatessomedegrada3onover3me,but
behaviorchangedwithelectronicsswitch
-0.4-0.3-0.2-0.10
0.1
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5
ResponsivityChange[%
]
TimeSinceLaunch[years]
TIRSResponsivityMetricascalculatedfromper-orbitcalibrationcollects
Band10BA Band11BA SideBswitch
Band10:0.21%peryear
PlotcourtesyofJuliaBarsi
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TIRSLongTermStability:Deepspace• Instrumentresponsetodeepspaceview
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SignalChange[counts]
TimeSinceLaunch[years]
TIRSDeepSpaceascalculatedfromper-orbitcalibrationcollects
Band10bandaverage Band11bandaverage Electronicsswitch
PlotcourtesyofJuliaBarsi
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TIRSVicariousCalibra3ondata
Alldatahasbeenprocessedwiththestraylightcorrec3on.Atthisscale,dataarenicelyscaJeredaboutthe1:1line,thoughitdoesappeartohaveacalibra3ondifferencebetweenSide-AandSide-Bopera3ons
Allmodules,day3medataonly
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ImageRadiance
VicariousRadiance
B10CurrentCalibrationResults
JPLcentermodule RIT,allmodules 1:1line
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ImageRadiance
VicariousRadiance
B11CurrentCalibrationResults
JPLcentermodule RIT,allmodules 1:1line
PlotcourtesyofJuliaBarsi,NinaRaqueno,SimonHook
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TIRSVicariousCalibra3onResultsSplitCalibra3onResidualerror
• Assumingnodifferencebetweenelectronics
Band Electronics N
Collec8on-1Residualbias
error[W/m2srum]
Collec8on-1Residualbias
error[K]
Collec8on-1RMSE[K]
10primary 145 -0.02+/-0.01 -0.30 0.51redundant 223 -0.06+/-0.01 -0.41 0.48
11 primary 145 0.07+/-0.02 0.55 0.78redundant 223 0.02+/-0.01 0.13 0.85
• Only considering daytime data
TablecourtesyofJuliaBarsi
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Collec3on-1addi3onofOverlapanalysis
• U3lizeGeometricprocessingregistra3onandresamplingtoolstofindpixel-pairsintheproducedimagesfromtwoadjacentmodules.
• ComputetheRa3oandDifferenceovereachsceneforalloverlapzonesinallbandsincludingTIRSinallearthscenes
• Es3matesarestableandclean.Usingover60,000pairssamplesineachzoneperscene.
• Sta3s3cshadbeencollectedfortheen3reLandsat8archive(>1,020,271earthscenesasofJune302017)
- 7 - LDCM-DFCB-002 Version 9.0
Figure 2-5. SCA Detector Overlap
2.1.1.2 Detector to L0Ra Pixel (ground) Overview Refer to Figure 2-6 for an OLI example detector to pixel mapping. The detector readout order for the even-numbered SCAs is reversed in the L0Ra image output to account for their ‘flipped’ orientation on the focal plane, and that the VRP pixels are stripped from the image bands.
OLI SCA Overlap Area (approx. 20 pixels)
SCA13 SCA9 SCA11 SCA7 SCA5 SCA3 SCA1
Along Track Direction
Along Track Direction
TIRS SCA Overlap Area 35 pixels between
adjacent SCAs 70 pixels per line total
SCA C
SCA B SCA A
OLI–FPMLayoutandoverlapdiagram(Source–USGS.”Landsat8Level0ReformaJedDataFormatControlBook”hJp://landsat.usgs.gov/documents/LDCM-DFCB-002.pdf)
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Updatedplotwithnewdataspanning>4years
Meanofnewdataincludessignallevelsthroughoutthefulldynamicrange.
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Mod
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ean
Landsat8BandNumber
BoundaryZone1BoundaryZone2BoundaryZone3BoundaryZone4BoundaryZone5BoundaryZone6BoundaryZone7BoundaryZone8BoundaryZone9BoundaryZone10BoundaryZone11BoundaryZone12BoundaryZone13
Prototyperesultstestson<32scenes
Updatedresults>500,000scenes
PlotusedatathroughApril2017
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CAband-UniformitytrendFilteredtoasetof530147to553566scenesineachoverlapzone
Overla
pRa
3o
filtered-Black4000scenesmovingAvgSmoothed-Green
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uleOverla
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BoundaryZone1BoundaryZone2BoundaryZone3BoundaryZone4BoundaryZone5BoundaryZone6BoundaryZone7BoundaryZone8BoundaryZone9BoundaryZone10BoundaryZone11BoundaryZone12BoundaryZone13
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Filteredby:Mean<=signallevelinoverlap<2xmeanandStdevofra3o<(meanstdev)thisresultedinselec3ng287407smoothedbymovingaverageof400scenes.
TIRS-Uniformitytrend
Module-1/Module-2-GreenModule-2/Module-3-Black
Module-1/Module-2-GreenModule-2/Module-3-Black
Overla
pRa
3o
TimeSinceLaunch[Years]
BAND10
BAND11Overla
pRa
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TimeSinceLaunch[Years]
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Signallevelfiltering
Sincescenesta3s3csincludesthedifferenceandra3oforeachoverlapzone.Themeansignallevelintheoverlapcanbecomputed.Withcolla3ngoverlapra3oresultsforsubsetsofthesignallevelsnewplotsofthera3oover3mecanbeproduced.Residualsignalleveldependentuniformitycorrec3onscanbefound.
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CAband-Signallevelfiltering0-0.2Reflectance
0-1Reflectance
0.2-0.6Reflectance
Overla
pRa
3o
TimeSinceLaunch[Years]
Overla
pRa
3o
TimeSinceLaunch[Years]
Overla
pRa
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Overla
pRa
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TimeSinceLaunch[Years]
Module-3/Module-4-BlackMovingAvgSmoothedModule-3/Module-4-Green
0.6-1Reflectance
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Canwesearchforresidualnon-linearity?
• Selectsubsetofsignalsin20stepsperband• ComputetheOverlapra3ofromeachsubset• AverageoverthesubsetandplotforeverySCAoverlapthera3ovs.signallevel.
• Timeperiodcanbepredefined(Ididnotfilterforthatinthisini3allook)
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CABandRa3ocomputedVs.Signallevel
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ean
BoundaryZone1BoundaryZone2BoundaryZone3BoundaryZone4BoundaryZone5BoundaryZone6BoundaryZone7BoundaryZone8BoundaryZone9BoundaryZone10BoundaryZone11BoundaryZone12BoundaryZone13
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Summary• LikeanymissionLandsat8-encountereditson-orbitchallenges– Impactofon-orbiteventsare<0.3%forallbands(band11SideA/Bswitchexcluded)
– Stabilityofrela3vegainsinVNIRbands–improvedfollowing1stsafehold
– StabilityoftheresponseoverallwasminimallyimpactedforOLIandTIRSandiftrendexistsitis<0.3%peryear.
• Trendsofoverlapstatsandinternalcalibratorscandetectslightvaria3onsintheresponsefollowingon-orbitevents,whileotherexternalsourcesEarth/Lunararenotsensi3veenoughtodetectthesmall(<0.5%)varia3ons.
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Summary• OLIdemonstratesuniformitylevelofbeJerthan0.3%overtheen3redynamicrangewithslightseasonalvaria3onsover3me.
• TIRSdemonstratesuniformitylevelofbeJerthan0.3%forband10andbeJerthan0.5%forband11.
• Earthscenebasedmethodofoverlapsta3s3cshasthepoten3alforderivingon-orbitresidualcorrec3onsformodulerela3vegainsincludingupdatesfornon-linearitycorrec3onsacrossthedynamicrange.
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Newcalibra3onac3vi3esweareworkingon
• BuilduptheevidencetoupdateTIRScalibra3onforCollec3on-2.
• Evaluateusingoverlapsta3s3cstoflaJenOLIandTIRSdata.
• Evalua3ngotheron-orbitmethodsforassessmentofTIRSuniformity.
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Ques3ons?