利用Mapgis软件将等值线逆向数值化的方法

应用Mapgis软件处理无基础数据的地质图件时,存在后期使用困难、精度不高、绘图速度慢的问题。本文总结一套有效的方法,将图形文件,转成数据文件,便于后期数据分析利用,以地质灾害危险性评估工作中要求提供的5年平均沉降速率图为例,对等值线逆向数值化进行演示。

The Method Introduction to Contour Map Transferring into Numerical Value by MapGIS Software

During the MapGIS software processing the geological map without base data, there is great dififculty in the late utilization stage, for example the accuracy is not enough, and drawing speed is slow. This paper summarizes an effective method of transferring contour map into numerical value which is so convenient for post-data analysis. To take an “average subsidence rate map within 5 years” as an example, that is required in geological hazard assessment work, this paper shows the detailed converting processes from the contour map to numerical value.