基于遥感的九段沙湿地DEM构建及动态变化分析

对九段沙湿地1987年、2001年和2004年多个时相的Landsat遥感影像提取了多组水陆边界点，并依据四周4个潮位站的潮位观测值，用距离倒数权重法计算了各组边界点的高程。结合相应年份长江口海图九段沙区域的水深数据，构建了九段沙湿地3个年份的数字高程模型。统计对比分析结果表明，目前九段沙湿地0m线以下部位的淤积速度显著下降，-6m线部位已开始蚀退；另一方面，0m线及以上湿地部位的淤积速度仍有所加快。

DEM construction and dynamic change analysis of J iuduansha wetland based on remote sensing

Jiuduansha wetland is a typical island surrounded by water region in the Yangtze estuary,and it is one of important land resources of Shanghai,so its evolvement has attracted much attention.The multi- group instantaneous border points between water and land of Jiuduansha wetland have been identified from multi-temporal Landsat images,and their elevations have been computed by inverse distance weighted inter- polation algorithm according to the tide levels of the four surrounding tide stations.And combining ...