基于不同大小窗口的移动曲面拟合法探测不规则DEM粗差的一种方法

Abstract

粗差的存在会造成数字高程模型(DEM)空间上的严重扭曲,有时能导致DEM及其产品严重失真,甚至完全不能使用。因而有关DEM的粗差诊断问题已愈来愈引起人们的关注。本文在对现有的基于点方式的DEM粗差探测算法进行分析的基础上,提出一种基于不同大小窗口的移动曲面拟合法探测DEM粗差的一种方法(简称YXY算法),并通过蒙特卡洛仿真试验来验证该算法的有效性和可行性。 The presence of gross errors will distort the spatial variation presentation in digital elevation model (DEM). In some cases, totally undesirable and unacceptable results may be produced in DEM and its derived products due to the existence of such gross errors. Therefore, the detection of gross error in DEM has been becoming the focus that people greatly concern for. Depend on analyzing the existing algorithms of detecting gross errors in DEM based on the point wise method, a new algorithm(YXY algorithm)based on fitting of moving quadric surface with variable windows is established in this paper. Some simulated examples are given by Monte Carlo Method to verify that the method proposed is more reliable and correct than existing method.