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1、122IEEETRANSACTIONSONGEOSCIENCEANDREMOTESENSING,VOL.26,NO.2,MARCH1988RadiometricCorrectionofC-BandImageryforTopographicEffectsinRegionsofModerateReliefMARIOHINSE,Q.H.J.GWYN,ANDF.BONNAbstract-Wehaveexaminedthecombinedeffectsoftopography,raphy,inordertoobtainabetterunderstan
2、dingofthe,ef-slope,lookangle,andaspectonC-bandSARdata.Thesearetheprin-fectsduetotheilluminationandlookgeometriesofthecipalenvironmentalfactorsthataffecttheradiometricqualityofSARacquisitionsystems,aswellastoimprovethedigitalim-imagesinaregionofmoderaterelief.Weusedacorrect
3、ionmethodinordertoattenuatethechangeofageanalysismethods.illuminationacrosstheswathduetotheantennapattern.GrounddataTheprincipalfactorsaffectingradarimageryarepre-wereintegratedintotheanalysisusingadigitalterrainmodel(DTM).sentedschematicallyinFig.1.Therecordedimage(Zr)Cor
4、rectionfunctionsbasedonthecosineoftheincidenceanglewereisafunctionofthetransformationsrelatedtotheradio-appliedtothethematicclassesandtothegroupedclassesinordertometriccharacteristicsoftheSARsystem,geophysicalreducetheeffectsrelatedtotopography.Thestudydemonstratesthatitis
5、possibletoeliminatepartofthefactorsandplatforminstability(Tr),coherentnoise(Nc),radiometricvariationscreatedbymoderatetopographicrelief.Aftertransformationofgeometriceffects(Tg),andthere-thecorrectionswereapplied,wenotedareductionofthevarianceinceivedbackscattersignal(Rs).
6、Thefactorsassociatedtheradiometricvaluesofthespectralsignaturesofthecovertypes,withTrandNccanbeconsideredasthesourceofthewhichrangedbetween3.03and9.47percentdependingonthecorrec-radiometricdegradationoftheimageandthetermTgcantionfunctionused.Nonoticablecorrectionoccurredof
7、pixelswithslopeslessthan6"andatlocalincidentangleslessthan26".However,beconsideredasthesourceofgeometricdistortions.theclosertheslopesaretobeingperpendiculartothelookdirection,Thepurposeofthispaperistostudytheradiometricthestrongeristhecorrelationbetweenbackscatterandslope
8、angle.correctionsthatarerelatedtothetopographyinanair-borneSARimage.Specifically,theresea
