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利用遥感与地理信息系统技术,提取1987,1998,2003和2008年4个时段洞庭湖"冬陆夏水"区域。运用改进归一化差异水体指数(MNDWI)的方法,提取丰水期和枯水期遥感图像的水体并相减,获得"冬陆夏水"区域,并对20年的"冬陆夏水"变化的面积进行监督分类。分析发现,研究区的"冬陆夏水"面积,从1987年到2008年的20年中,增加区域的面积有9.52万hm2,40.65%为泥滩地,38.94%为苔草滩地,20.41%为芦苇滩地。为进一步研究钉螺孳生地生态环境因子做了前期工作。 更多还原

【Abstract】 The regions of "water in summer and land in winter" of four periods in Dongting Lake were extracted by using remote sensing(RS) and geographic information system(GIS).The images of RS for abundant-water period and low-water period in Dongting Lake were extracted and Modified Normalized Difference Water Index(MNDWI) was computed and extracted.The regiond of "water in summer and land in winter" were determined by subtracting the MNDWI in the two images.The changes of the regions among 20 years wer... 更多还原