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The Remote Sensing Study on the Characteristics of Forest steppe Ecotone

GUO\ Qinghua (Institute of Remote Sensing,Peking University,Beijing,100871) YU Hong\ CAO Yanli\ ZHANG Zepu (Department of Urban and Environment Science,Peking University,Beijing,10 0871)  
Based on the NOAA AVHRR data and GIS software,we studied on the characteristics of forest steppe ecotone in the southern edge of Inner Mongolia Plateau.The pat tern of NDVI was analyzed through 12 monthly NOAA AVHRR data of the years 1992 1993.Meanwhile,we used standardized principal components as a compressed tool to analysis the working area.And then two principal components was extracted,we found that the component 1 stood for the cumulative NDVI which meant the total b iomass;the component 2 represented the variance between the hot months and the c old months which amounted to the fluctuation from the growing periods to the un growing periods.The component 1 was gradually increased vie the steppe to the forest coincide with the component 2.Finally,the working area was classified by the two principal components,the result of classification is satisfying.It prove d that the standardized principal component method is an effective tool for clas sifying.
【Fund】: 国家自然科学基金
【CateGory Index】: X87
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