一个好用的开源GIS软件代码，使用了agg、boost等著名的开源代码库。

mapnik2.1地图渲染引擎代码 mapnik是一个免费的地图开发工具。由C++编写，与python绑定支持快速敏捷的开发。-mapnik2.1 map render engine sourcecode. Mapnik is a Free Toolkit for developing mapping applications. It is written in modern C++ and has Python bindings that support fast-paced agil