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1、1007-4619(2011)05-875-20JournalofRemoteSensing遥感学报ValidationofMODISBRDFmodelparametersproductandtheRoss-LimodelwithPOLDERdata1,211,3111ZHUGaolong,JUWeimin,CHENJingming,LIUYibo,ZHUJingfang,XINGBailing1.InternationalInstituteforEarthSystemScience,NanjingUniversity,JiangsuNanjing210093,Ch
2、ina;2.DepartmentofGeography,MinjiangUniversity,FujianFuzhou350108,China;3.DepartmentofGeography,UniversityofToronto,Toronto,Ontario,M5S3G3CanadaAbstract:TheabilityoftheRossThick-LiSparseRBRDFmodel(Ross-Limodel)tosimulatethebidirectionalreflectanceisassessedbycomparingthereflectancesimul
3、atedusingtheRoss-LimodelbasedontheMCD43A1datawiththeobservedPOLDER-3BRDFdatafor9961pixelsselectedfromtheglobalPOLDER-3/PARASOLBRDFarchive.ItisfoundthattheRoss-2Limodelisabletosimulatethebidirectionalreflectanceofgroundobjectsefficiently.TheRandrootmeansquareerror(RMSE)ofsimulatedreflectan
4、ceare0.934and0.016,respectively.Onaverage,simulatedreflectanceis5.2%lowercomparedwiththe2POLDER-3data.However,theRoss-Limodelunderestimatesthereflectanceby14%forhotspots,withRequalto0.824andRMSEequalto0.07.Theerrorsinsimulatedreflectanceforhotspotsdependonlandcovertypes.Coniferousforestsh
5、avethelargestunderestimatesofsimulatedreflectanceforhotspots,followedbybroadleavedforests,grasslands,croplands,shrubsandbarrenlands.ThemodificationforthevolumekernelintheRoss-Limodelcannoticeablyimprovereflectancesimulationfor2hotspots(R=0.839,RMSE=0.043).ThereflectancesimulatedbytheRoss-L
6、imodelisrelativelyaccurateatnadiranddarkspot.ThedepartureofsimulatedreflectancefromthePOLDER-3observationsincreaseswiththeincreasesinsolarzenithandviewzenithangles.Forgrasslandsandcroplands,theaccuracyofsimulatedreflectancedecreaseswiththeincreaseinNDVI.Howev-er,forforestsandshrubs,thedi
7、screpancybetweenreflectancesimulatedbytheRoss-LimodelandthePOLDER-3observationsmaximizeswhenNDVIapproximatelyequals0.5.Keywords:MODIS,POLDER,hotspotreflectance,Ross-Limodel,BRDFmodelparametersproductCLCnumber:TP702Documentcode:ACitationformat:ZhuGL,JuWM,ChenJM,LiuYB,ZhuJFandXingBL.2011
