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1、848IEEEJOURNALOFSELECTEDTOPICSINAPPLIEDEARTHOBSERVATIONSANDREMOTESENSING,VOL.5,NO.3,JUNE2012ImprovingPolSARLandCoverClassificationWithRadiometricCorrectionoftheCoherencyMatrixDonaldK.Atwood,Member,IEEE,DavidSmall,Member,IEEE,andRüdigerGens,SeniorMember,IEEEAbstract—Thebrig
2、htnessofaSARimageisaffectedbytopog-Importantinformationcanbeextractedfromsinglepolar-raphyduetovaryingprojectionbetweengroundandimagecoor-izationSARdata,wheresignalbrightnessandtexturecandinates.ForpolarimetricSAR(PolSAR)imagerybeingusedforofferusefulinformationonlandcove
3、r.Howeve,themostpurposesoflandcoverclassification,thisradiometricvariabilitysignificantgainshaveoccurredwiththerecentavailabilityisshowntoaffecttheoutcomeofaWishartunsupervisedclassifi-cationinareasofmoderatetopography.TheintentofthispaperofpolarimetricSAR(PolSAR)datafromsen
4、sorssuchastheistoinvestigatetheimpactofapplyingaradiometriccorrectionto-bandALOSPALSAR,-bandRadarsat-2,and-bandthePolSARcoherencymatrixforaregionofborealforestininte-TerraSAR-X.Withintheconstraintsoffrequency,incidenceriorAlaska.Thegammanaughtradiometriccorrectionestimate
5、sangle,andspatialresolution,quad-poldatayieldsacompletethelocalilluminatedareaateachgridpointintheradargeom-etry.Then,eachelementofthecoherencymatrixisdividedbythecharacterizationoftheSARmicrowaveinteractionwiththelocalareatoproduceapolarimetricproductthatisradiometricall
6、ytarget[1].Incoherenttargetdecompositionsoffersignificant“flat.”Thispaperfollowstwopaths,onewithandonewithoutra-insightintolandcoverbycharacterizingeachpixelbyitsscat-diometriccorrection,toinvestigatetheimpactuponclassificationteringproperties:surfacebounce,doublebounce,orvo
7、lumeaccuracy.UsingaLandsat-derivedlandcoverreference,thera-scattering[2]–[4]orentropy,alphaangle,andanisotropy[5].diometriccorrectionisshowntobringaboutsignificantqualitativeandquantitativeimprovementsinthelandcovermap.ConfusionRGBrepresentationsofthesedecompositionsgiveim
8、mediatematrixanalysisconfirmstheaccuracyformostclassesandshowsaphysicalinsightintothestructureofl
