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采用网格索引来组织地形数据，利用反距离高程加权平均值算法，提取TIN地形的特征点。
Terrain data is organized by grid, the article adopts height weighted average algorithm of elevation based on grid network, to extract feature point of TIN terrain.
基于以前研究者的工作，提出了从细化网格图象中提取网格点的算法。
Based on former researcher's works, an algorithm for grid nodes extraction from thinned grid image is present.
网格标记点的提取与匹配。
The extraction and the matching of the rectangular grid nodes.
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