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标题：TOWARDS GLOBAL MAPPING OF IRRIGATED AGRICULTURE
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作者：M. Ozdogan ; G. Gutman
期刊名称：ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences
印刷版ISSN：2194-9042
电子版ISSN：2194-9050
出版年度：2007
卷号：XXXVI-7/C50
出版社：Copernicus Publications
摘要：edevelopedanirrigationmappingmethodologythatreliesonremotelysensedinputsfromMODerateResolutionImagingSpectroradiometer(MODIS)instrument,globallyextensiveancillarysourcesofgriddedclimateandagriculturaldataandonanadvancedimageclassificationalgorithm.Inthefirststep,weusedclimate-basedindicesofsurfacemoisturestatusandamapofcultivatedlandstoprovidepotential,first-cutatglobalirrigation.Todetectactualirrigation,inthesecondstep,weusedspatio-temporalandspectralsignaturesfromMODISremotelysenseddata.Inparticular,weexploredthreetypesofirrigation-relatedindices:i)Annual–whereweexploitedthedifferenceinannualgreennessvariabilitybetweenirrigatedandnon-irrigatedcropsandrelatedthisdifferencetoprecipitationavailability;ii)Spectral–whereweexploitedavegetationindex(GreenRatioIndex)thatissensitivetochlorophyllcontent;andiii)Inter-annual–whereweexploredthedifferencesininter-annualchangesinvegetationgreennessassociatedwithprecipitationbetweenirrigatedandnon-irrigatedcrops.Inthethirdstep,wecombinedourpotentialirrigationdataset,remotelysensedindices,andtrainingexampleswithinasupervisedclassificationtoolbasedonanon-parametricdecision-treealgorithmtomakeabinary(i.e.irrigatedvs.non-irrigated)irrigatedagriculturemap.AtestofirrigationmappingprocedureinapilotstudyoverthecontinentalUSproducedahighspatialresolution(1km)mapofirrigatedareaswithbetterthan80percentmapaccuracyandexpectedspatialpatternssuchasastrongeast-westdividewithmostirrigatedareasconcentratedonthearidwestalongdrylowlandvalleys.Futureimprovementsofthemethodwillincludeestimationofsub-pixelpresenceofirrigationusingremotely-sensedskintemperaturemeasurements
关键词：Irrigation;MODIS;Land-use/Land-cover;Agriculture;Wate