南方典型丘陵区域DEM高程插值方法研究

Discussion on Different DEM Interpolation Methods in Typical Hilly Area of Southern China

以湖南城市学院玉壶山为研究区域,利用曲面移动拟合法、线性内插法、自然邻点插值法和Kriging插值法等4种插值方法对采样点数据进行高程插值,生成规则格网DEM,并对内插结果进行了精度分析.在建立DEM的基础上,对4种插值方法生成相应的等值线、坡度和坡向值,通过与实际地形的比较,对不同算法插值结果进行了分析和评价.实验结果表明,在地貌类型以丘陵和山地为主的南方地区,曲面移动拟合法(SMF)有着更加良好的表现,能够更精确地模拟出真实的地形.本文研究可为南方典型丘陵区域DEM内插算法的选择提供参考和借鉴.

The Yuhu hill in Hunan City University is taken as a research region in this paper, the four kinds of different interpolation methods（surface mobile fitting, linear, natural neighbor interpolation and kriging） are used to generate regular grid DEM based on the scattered point data, and the precisions of interpolation results produced by four interpolation methods are analyzed. Contour, slope and aspect maps are extracted based on DEM, and the spatial interpolation accuracies of four interpolation algorithms were compared, finally, the interpolation results of different algorithms are analyzed and evaluated. The result shows that the surface mobile fitting method is better than other three methods, and which can accurately simulate the real terrain. The reasearch results will provide information for the selection of interpolation algorithms.