地图放大、缩小、漫游、几何运算、投影转换等简单功能-Map zoom, roam, geometric computing, projection conversion and other simple functions

地形建摸算法-roam，论文作者亲自编写-Terrain algorithm built touch-roam, authors write personally

描述了一种用于简化大规模地形数据，并实现的算法，名称叫ROAM算法。-Describe a method for simplifying large-scale topographic data, and implemented algorithms, the name is called ROAM algorithm.

3dmax模型导入到用opengl库和c++实现的小场景中，有两个房子，屋顶是树叶，可以在房子内外漫游，用microsoft visiual studio 2008打开-3dmax model into the library and c++ with opengl achieve a small scene, there are two houses, roof leaves, you can roam the house and outside, with microsoft visiual