对早期的局部线化简算法进行拓展和改善，提出一种以建筑物多边形上邻近四点组合为基本处理单元，以最小可视长度阈值为综合指标，通过对其凹凸结构的类型判别及区别处理，实现建筑物多边形快速化简的方法。将线化简中对三点或多点进行局部处理拓展为邻近四点，较好地保持了建筑物形态特征；有针对性地采取全局检查消除自相交现象，并探讨了起始点的选择问题。选取1∶10000居民地数据进行多组地图综合试验，结果表明该方法可有效地保持多边形的轮廓特征与面积大小。%A fast approach is presented to simplify building polygons which extends and improves early line simplification algorithms based on local processing .It takes continuous adjacent four points as the basic unit and minimum visible length threshold under the target scale as generalization parameter considering the right-angled formation and area of buildings to be kept .Definitions of the structure of different adjacent four-point combinations ,namely , Z-structure and U-structure ,and ways to distinguish and processing them are proposed .Through selecting a start point ,taking serial neighboring four points from a building polygon continually ,simply discriminating their structural feature and displacing or deleting some of them ,this method preliminarily completes the simplification of the building polygon when all different four-point groups of it have been simplified .Then whole examination is taken to solve the problem of self-intersection . Finally several simplification experiments are conducted to discuss the selection scheme of the start point and test the feasibility of the method ,which turns out to be satisfying .
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