径向基函数算法中插值参数对DEM精度的影响  

Effects of Interpolation Parameters in Multi-Log Radial Basis Function on DEM Accuracy

作　　者：张锦明[1] 游雄[1] 万刚[1] 

机构地区：[1]信息工程大学测绘地理空间信息学院,郑州市陇海中路66号450052

出　　处：《武汉大学学报（信息科学版）》2013年第5期608-612,共5页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目(40971239)

摘　　要：以多重对数径向基函数插值算法中的插值参数为研究对象,选取了5种不同地貌类型的离散点数据,使用中误差度量指标,研究光滑因子、搜索点数、搜索方向对DEM插值精度的影响,给出插值参数的"最优"取值区间,消除插值参数选择的随意性,更好地指导DEM建模的运用。Interpolation method is one of the most important factors which influence on the accuracy of DEM. After interpolation method is confirmed, interpolation parameters are a primary cause for the accuracy of DEM. However, there are few researches on how interpolation parameters influence interpolation method as well as the interpolation accuracy at last. In this paper, the interpolation parameters in interpolation method of multi-log radial basis function is chosen as the research objective and it selects the data of discrete points of five different kinds of physiognomy, uses middle error metrics index and researches the influence of smooth factor, search point and search direction on the interpolation accuracy of DEM.

关 键 词：数字高程模型 径向基函数 插值参数 光滑因子 搜索点数 搜索方向 

分 类 号：P208[天文地球—地图制图学与地理信息工程]