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。

等值线区域填充，即由等值线构造等值面。本程序具有很强的实用性，并附有详细的程序说明文档和参考文献，相信对你将会大有裨益。-Contour area filling, which also means constructec isosurface from contour. This procedure is highly practical, with detailed descr iption of the procedures documents and references, I beli