植被反射率及其在植被遥感中的应用

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1、植物生态学报2005，29(1)74～80ActaPhytoecologicaSinica表观反射率及其在植被遥感中的应用池宏康周广胜许振柱肖春旺袁文平(中国科学院植物研究所植被数量，丰态学重点实验窜，北京100093)摘要由于植被遥感应用定量化和监测等的需求，光学遥感数据的辐射校正更加受到重视该文论述了辐射校正，辐射定标和大气校正的慨念以及它们之间的区别及关系特别对辐射定标的结果之一，大气层顶表观反射率．简称表观反射率(Apparentreflectance)的定义、慨念、计算和它在植被遥感中的应用等方面，进行了详细的论述。关键词表观反射率辐射校正辐射定标大气校正植被遥感APPAR

2、ITREIECTANCEANDITSAPPLICATIoNSDVEGETATIoNREM-OTESENSINGCHIHong—KangZHOUGuang—ShengXUZhen—ZhuXIA0Chun—WangandYUANWen—Ping(Laborato~ofQuantitativeVegetationEcolog)，InstituteofBotan)，Chirw~seAr~MemyofScierwes，Beiji~100093，China)AbstractRemotesensingofvegetationisdevelopingintoahighlyquantitativesc

3、ience．However，somecon—ceptsandtermsrelatedtoquantitativeremotesensingareconfusingfornovicesofthisfield．ThegoalofthispaperiStoclarifyfuzzyconceptsandpromiscuoustermsandtointroducemethodsaboutdataprocessingofre．motesensinginformation．First，conceptsaboutradiometriccorrection，radiometriccalibration

4、，atmosphericcorrectionandthedifferencesandrelationshipsbetweenthemwerediscussed．Inopticalremotesensing，radio—metriccorrectionincludesradiometriccalibrationandatmosphericcorection．，I11eaimofradiometriccalibrationiStoeliminatetheerorsinthesensorsofthesatellite，andtheaimofatmosphericcorrectionisto

5、eliminatetheefectsofatmosphericinterferenceonsatellitedata．Ingenera1．thefirststepisradiometriccalibrationandthenatmosphericcorrection．Apparentreflectanceisoneoftheresultsofradiometriccalibrationandisaveryimpor—tantphysicalvariableinprocessingremotesensingdata．edefinitionofapparentreflectancecan

6、beindicatedwithaformula．lecalculationofapparentreflectancewasexplainedstep—by—stepusingexampleswithLand—sat．5andLandsat．7satelliteimages．AcasestudyWaspresentedinordertoshowtheimportanceofapparentreflectanceinthecalculationofV／(Normalizeddifferencevegetationindex)．Finally，itsapplicationsinvegeta

7、tionremotesensingwerelistedanddiscussed．KeywordsApparentreflectance，Radiometriccorrection，Radiometriccalibration，Atmosphericcorection，Vegetationremotesensing最近十几年植被遥感向定量化和动态监测方向题被再次提出。其中，光学遥感数据的辐射校正就深入发展。许多文章涉及到植被的生物量(Toddet是一个典型例