摘要
以1∶1万比例尺地形图(H-48-72-24)为例,采用地理信息系统软件Arc/Info数字化地形图生成数字高程模型,并通过DEM计算派生出坡度图,再结合土地利用现状图和相关资料,应用地理信息系统空间分析功能,自动提取坡耕地数据。整个过程主要由计算机进行处理,人工干预少,效率高。
The investigation of sloping farmland, especially that with slope steeper than 25°, is an important task in soil resource investigation and evaluation during the development of western China. DEM is a digital elevation model produced by computer system. It can make topographic analysis, simulate geomorphologic shape, and display geomorphologic characteristics and topographic position directly. With the 1∶10 000 scale relief map as an example and under the support of Arc/Info software of GIS, the authors formed DEM through digitizing the topographic contour map. The slope map computed and derived by the DEM was taken as the basic material and, with the integration of the landuse map and related material and the application of GIS to comprehensive analysis, the data of sloping farmland were obtained. In the whole process, computer processing occupies the dominant position and human interference is suppressed. Therefore, the efficiency is high.
出处
《国土资源遥感》
CSCD
2003年第4期59-62,共4页
Remote Sensing for Land & Resources
基金
重庆市科委攻关项目(6217)
重庆市教委科技项目(011802)。
