一个简单 的GIS示例程序，实现了图形的按比例放大、缩小等矩阵变换。

A small 2D-graphics application with source code for visualising Google Maps cache.

非常棒的GIS开发中间件，带有DEMO及详细开发文档。在VS.NET环境下直接调用即可。-Great development of the GIS middleware, with the development of DEMO and detailed documentation. Directly in the VS.NET environment can call.