A Modified Constrained Delaunay Triangulation Algorithm Based on Extracted Boundary Characteristic Points

TIN is used widely in terrain expression and Delaunay triangulation algorithm is the most popular one in reality. The problem that Delaunay Triangulation in the constrained data Held is dissatisfied for DT-characteristics is discussed and three exiting algorithms for extra points are analyzed. Algorithms is aiming to reduce the number of extra points from the geometrical view and consequently constructing the real terrain, so an algorithm for constrained Delaunay triangulation based on extracted boundary characteristic points is proposed. The essential of this algorithm is extracting all characteristic points which can construct real terrain and omitting extra points, then constructing Delaunay triangulation network to ensure its third dimension.