Polygon simplification and aggregation play an important role in automatic cartographic generalization

which is used for resolving spatial conflicts caused by reduction in the scale at which cartographic data are plotted. After analyzing the capabilities to detect conflict existed between polygons and in polygons of CDT-based SDR. Authors present a method for polygon simplification and aggregation to avoid the difference caused by separate operator. In this method

an improvement of conflict detection algorithm is applied to avoid the overmuch increase of area and the loss of characteristic vertex during polygon simplification and aggregation

which is caused by involving peaked triangles located at the edge of triangulate mesh. At last authors demonstrate the advantage of this method through experiments.