Abstract: Usually, flat triangles would be formed in constitutive TIN software in the contour at large curvatures, on top of mountains, in low-lying lands, on edge of maps and in the saddles. Thus, contradiction of elevation point with contour couldn't get effective results in these areas. Aiming at these problems, this paper proposes the method that repairing the flat triangles by the number of non flat triangles existing in the flat triangle regions. It is verified by ArcGIS Engine technology to be an effective method in processing flat triangles where contour curvature is large and in special terrain. The method given in this paper is beneficial to improving the accuracy of DLG in quality inspection.

Key words: flat triangles, TIN, terrain lines tree

摘要： 通常构TIN软件都会在等高线弯曲度较大、山顶、洼地、图幅边缘、鞍部等位置形成平三角形，使得这些区域的点线矛盾检查不能得到有效的结果。针对上述问题，提出根据平三角形区域存在的非平三角形个数来修复平三角形的方法。利用ArcGIS Engine技术验证了等高线弯曲度较大的地方及特殊地形处平三角形区域处理方法的有效性。文中给出的方法对提高数字线划图点线矛盾质量检查的准确性是有利的。

关键词: 平三角形, TIN, 地性线树