针对开源sharpmap,而修改后，使sharpmap包装成opengl,从而可以实现高速绘图-For open-source sharpmap, and modified so that packaging sharpmap into opengl, so that we can achieve high-speed graphics

开源GIS中间件，功能很实用，是一个很好的GIS平台，可以直接引用，开发。-GIS open-source middleware, function very useful, is a very good GIS platform, can be directly quoted, development.