关键词: 平三角形, TIN, 地性线树

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