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《Progress in Geophysics》 2011-01
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A method extract remote sensing information of water-body based on exponential function

CHEN Wang~1,LIANG Hong~1,DENG Ya-dong~(1,2*),LI Jing~1,XIANG Shang~1(1.School of Geographic and Environmental sciences,Gui.Zhou Normal University,Guiyang 550001,China;2.Institute of Karst Geology,CAGS,Guilin 541004,China)  
MODIS data have the characteristics of high spatial spectral resolution and medium ground surface resolution.The change study of water-bodies using MODIS data to monitor and extract has become an important direction in the remote sensing application.This paper uses all kinds of objects have different reflectances on spectrum characteristic,but this method is difference from normal methods,it use the exponential function to stretch the reflectance of water-bodies and compress the reflectance of non-water-bodies,so we can use the non-linear function to construct the EXPWI(EXP Water Index).In order to improve the processing speed,we use ENVI/IDL to compile EXPWI method,The results show that it can automatically extract the medium remote sensing of water-bodies and identify the weak water-body information of lakes、rivers、earth surface and effective suppression of interference features in the background.In addition,taking the advantage of the ration computation,the EXPWI method can remove shadow noise from water information without using sophisticated procedures and reducing aerosological influence is one of the excellent results.
【Fund】: 中国地质科学院岩溶地质研究所资助项目(2007015)、中国地质科学院岩溶地质研究所资助项目(2009021);; 贵州省科学技术基金(黔科合J字(2005)2085号) 贵州省科技人才培养计划资助项目(黔科合人字(2003)0315)联合资助
【CateGory Index】: P331;P237
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