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该文使用多时相Landsat影像,以白洋淀地区为例,阐述基于中等分辨率的可见光—近红外遥感影像生成具有较高精度数字高程模型的非常规方法。对覆盖同一研究区的不同时相影像分别进行淹没区与非淹没区的分类,提取不同水位高度时的水域边界,并以此为相应水位高度的等高线,对获得的等高线进行插值生成数字高程模型(DEM)。这种由一系列遥感影像提取的水域图生成数字高程模型的方法适用于人为干预较少、地形相对简单的湿地或季节性湖泊,可以弥补该类地区数字高程信息不足或精度不够的缺陷。 更多还原

【Abstract】 An unconventional method of constructing Digital Elevation Model(DEM)was presented in the article,from a series of middle resolution remote sensing images.With the assumption that the surface of water reaches the same height everywhere within the lake,conceptually,it starts with mapping water surfaces using visible and infrared part of the electromagnetic spectrum.Then water boundaries are identified taken as contours in related water levels.In the end,the interpolated DEM derives from the conto...