喀斯特地形对DEM精度的响应——以清镇王家寨地区为例

A response of DEM accuracy to karst topography——A case study of Wangjiazhai village in Qingzhen city

以高精度的1∶1万DEM为准值,通过对1∶5万和1∶1万DEM提取定量地形要素的叠合、比较与统计分析,探讨岩溶高原面上喀斯特地形对DEM精度的响应。结果表明,地面平均高程、等高线长度和地表表面积存在一定的差异,但1∶1万与1∶5万地形图所反映的地面坡度差异不是很明显,在喀斯特地区应用1∶5万DEM信息源仍有较高的精度。

Taken high accuracy DEM of 1 ： 10 000 scaled as a criterion , deriving quantitative topographic elements from 1：50 000 and 1：10 000 scaled DEMs , applying overlay comparative laws and mathematical statistics as basic research methodology, a research was made on the response of DEM accuracy to karst topography on the karst plateau. The results showed that there were some differences among ground average elevation,contour line length and land surface area. However, slope differences expressed by 1 ： 10 000 and 1： 50 000 topographic maps were not obvious. It had higher precision applying 1：50 000 scaled DEM as main information resources in karst areas.