DEM坡度衰减对面蚀坡度分级的影响  

Impact of DEM Slope Reduction on the Slope Classification of the Surface Erosion

作　　者：朱宝才[1,2] 王文龙[2,3] 梁文俊[1] 

机构地区：[1]山西农业大学林学院,山西太谷030801 [2]西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 [3]中国科学院水利部水土保持研究所,陕西杨凌712100

出　　处：《亚热带水土保持》2016年第2期5-7,18,共4页Subtropical Soil and Water Conservation

基　　金：国家自然科学基金项目(41571275)(31500523)资助

摘　　要：为明确数字高程模型(DEM)精度对提取坡度的影响,本文以下辛佛煤矿井田为例,在Arc GIS 10.2支持下,分别用5种不同等高距等高线(5m、10m、15m、20m和25m的等高距)生成不规则三角网,6种不同采样间距(1m、5m、10m、15m、20m和25m的采样间距)转换为栅格,2种不同单元(以井田和土地利用现状图地块为单元)统计坡度信息。结果表明:随着等高距和采样间距增大,井田平均坡度趋于平缓;地块平均坡度分级一致面积比例下降,且等高距影响远大于采样间距的影响。分析结果表明,1∶10 000地形图生成DEM,提取坡度时用5m等高距等高线和5m采样间距较好。The essay is to identify the impact of the accuracy of digital elevation model （DEM） on the slope extraction. The Xinfo Coal Mine was selected as the example for the study. With the support of the ArcGIS 10.2, five different contour interval lines （5m, 10m, 15m 20m and 25 m contour interval） were used to generate the irregular net, six different sampling interval （1m, 5m, 10m, 15m, 20m and 25m sampling interval） were transferred as the grids and two different units （ using the mine and massif in the land use map as the unit） were used to calculate the slope information. The results showed that following with the increase of the contour interval and sampling interval, the average slope in the mine field tends to be gentle, with the decrease of the average area proportion in the average slope of the land mass. The effect of the contour interval is much higher than the effect of the sampling interval. The results showed that it is better to use the 5m contour interval line and 5m sampling interval for the extraction of the slope by the DEM generated from the 1：10000 topographic map.

关 键 词：DEM 坡度 ARCGIS R2V 

分 类 号：S157.1[农业科学—土壤学]