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《Resources and Environment in the Yangtze Basin》 2012-03
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COMPARATIVE ANALYSIS OF VEGETATION COVERAGE ALONG THE YANGTZE RIVER IN ANHUI PROVINCE BASED ON MODIS/NDVI AND EVI

YE Qi1,ZHAO Ping2,SUN Jing1,3 (1.College of Land Resources and Tourism,Anhui Normal University,Wuhu 241003,China;2.College of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230000,China;3.Anhui Key Laboratory of Natural Disaster Process and Prevention,Wuhu 241003,China)  
The temporal and spatial variation characteristics of NDVI and EVI along the Yangtze River in Anhui province are compared by using multi-temporal TERRA/MODIS remote sensing images,and the spatial resolution and the atmospheric correction influences on NDVI and EVI are also analyzed in this paper.The results show that the vegetation coverage conditions reflected by MODIS / NDVI and MODIS / EVI are basically the same.The spatial distribution in May shows more obvious differences than that in August,and in vigorous growth period,EVI can reflect the vegetation coverage conditions better than NDVI.In the same spatial resolution(250 m,500 m,1000 m),EVI can reflect the spatial differences of the vegetation coverage much better than NDVI.With the reducing of the spatial resolution,the differences of the vegetation coverage reflected by the two kinds of indexes also decrease.Atmospheric correction has different influences on NDVI and EVI.The values of NDVI are lower than the EVI values before the atmospheric correction,while after the atmospheric correction,the values of NDVI are generally higher than the EVI values.The atmospheric correction has less effect on the NDVI but more significant effect on EVI.
【Fund】: 中国科学院对地观测中心数字地球重点实验室开放基金(2010LDE05)
【CateGory Index】: Q948;TP79
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