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The Setting-Up of Grid DEM Based on Surface Fitting Using Weighted Least Square
Author(s): 
Pages: 41-44
Year: Issue:  3
Journal: HYDROGRAPHIC SURVEYING AND CHARTING

Keyword:  DEM内插加权最小二乘法;
Abstract: 数字高程模型(DEM)是描述地表起伏形态特征的空间数据模型.DEM完全可以代替传统使用等高线对地形表面的描述,进而满足对等高线数据相同的各种需求.内插是DEM的核心问题,它是DEM各种应用的基础.介绍了加权最小二乘曲面拟合法构建规则格网DEM的理论和方法.试验结果表明:加权最小二乘曲面拟合算法具有插值结果较精确、处理效率较高和模拟地表效果较好等优点.
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