一个简单的数字地图显示程序，有扩大，缩小，移动，漫游，图层控制，面积计算，长度计算等功能，另外附有原数据。-A simple digital map display program, has expanded, reduced, mobile, roaming, layer control, area, length and other functions, the other with the original data.

一个简单的图形处理程序，读取地理数据，绘制显示地图，实现了地物的符号化。具有放大、缩小、漫游，元素选取、拖动、选取、删除等基本功能-A simple graphical procedure, read the geographic data, map display maps, to achieve the features of the symbol. With enlarged, reduced, roaming, select e