该文件包含了用来计算地图投影的三个小工具。可分别用来计算墨卡托、横轴墨卡托和兰伯特(双标准纬线)三种投影。工具中内置ＷＧＳ84、北京54和西安80三种椭球，提供了正算和反算。基本上能够保持投影的正确性，可做为投影参考工具。-This file includes three projections ,which is Lambert(2SP)、Mercator and Transverse Mercator.

TM投影一个发展方向是正切的Gauss-Krüger（高斯-克吕格）投影，横轴墨卡托投影正算(TM projection directions tangent Gauss-Kr u ger (Gauss Krueger) projection, transverse Mercator projection is calculated)