vb+mapx开发的简易地图查询 供学习 -vb+ mapx simple map queries for the development of learning

VB+MapX的一个小例子，很简单但是对于初学者很有帮助，能够做到启发-VB+ MapX a small example, very simple but very useful for beginners, can be enlightening

VB+MAPX 实现地图投影转化 显示地图坐标，地图坐标系，坐标系转化等(VB+mapx Realize map projection, transformation, display map coordinate, map coordinate system, coordinate system transformation, etc.)