GD 一个非常好的创建图形的库，我修改过可以用VC6编译。-a very good GD graphics library to create, I can be modified using VC6 compiler.

gdal是开发GIS 的重要库,可以操作栅格与矢量数据，这是最新的已编好的库，与visual 2005,2008 直接应用-gdal important is to develop GIS database, can operate grid and vector data, which is the latest has been a good library, with the direct application of visual 2005,2008

vc++6.0+gdal开发的聚类算法的COM组件，可在vb或.Net中直接调用。其中包含的聚类算法有：K-Means,ISODATA等,可对Image影像进行聚类处理。-vc++6.0 development of COM components clustering algorithm can vb or. Net direct call. Which includes the clustering algorithm are: K-Means, ISODATA, etc.