基于tvdi和mpdi指数的淮河流域干旱时空变异规律分析

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1、万方数据AbstractAsonekindofworldwidenaturaldisasteracrosslargescale，droughtsignificanteconomic，socialandenvironmentalconsequences．Comparedtootherdisasters，droughtisatypicalaccumulativedisasterwhichcouldpersistforseveralyearsandcausesignificantdamageandharmthelocalindustryandagriculture，evenimposeatoughb

2、urdenupontheresidents．Thehuaiheriverbasinislocatedintheeasternpartofourcountry，mainlyaretheplains．ThisareaisoneofimportantagriculturalproductsbaseinOUrcountry，SOdroughtiswreakinghavocondevelopment，andwhatismore，thisareaistypicallyecologicalfragilezone．Therefore，ithasanimportantpracticalsignificanceo

3、ntakingobjective，positiveandeffectivemeasurestomonitordroughtinformationandminimizelosses．Thispapercollectedavarietyofdroughtremotesensingmonitoringinformationathomeandabroad．Summarizedthedroughtremotesensinginversionmodels，ChooseThehuaiheriverbasinwhichaffectedbytheextremedroughteventsastheresearch

4、object，usingMODl1A2andMODl3A2whicharecomefromthesynthesizedproductMODISdatatoobtainthenormalizeddifferencevegetationindex(NDVI)andlandsurfacetemperature(Ts)，buildtheTs-NDVIfeaturespace．BasedonAMSR-EpassivemicrowaveremotesensingdatawehavebuiltMPDIdroughtindex．AndfurtherverifyMPDIdroughtindexintheappl

5、icabilityofthehuaiheriverbasin．Then，ThroughtheTVDIandMPDIIndexarecomparedwiththemeasuredsoilmoistureandthestandardizedprecipitationindex(SPI)．thestudyareaforthelongdynamicremotesensingmonitoringandevaluationin2006-2010．Includingthefollowingaspects：(1)UsingMODISdataproducts，extractfrcow，Ts)andtransfo

6、rmprojectionbytheMRTsoftware，andthenbuiltTs-NDVIfeaturespace，finallyobtainedtemperaturevegetationdrynessindex(TVD0ofevery16daysfrom2006to2010byVc++6．0ofthehuaiheriverbasin．DividethesoilmoistureintofivegradesbythevalueofTVDI，getfiveyearsdroughtgradespacedistributionofthestudyarea．Overall，theeasternp蜓

7、01f．也9stu．dyareainHuaiYtn_．L'mYietc．areaimoslinthewetandextremelywet；III万方数据ThemiddleofstudyareainSuXian，FuYang，XuChangandZhuMaDianexpresseddroughtandextremelydroughtformostofthetime．Resultsshowthat，T