Research on the fine DEM of the open-pit establishment method considering the steps character

At present, triangulated irregular net is the best method for landform expression, so we discusses the method of applying triangulated irregular net to establish the DEM of open-pit in this paper. Because of the complicated landform characteristic of open-pit, corresponding constraint condition should be considered in the process of building model, otherwise it will appear a phenomenon that the flight of the step is cut. The method of triangulated irregular net establishment includes three kinds of algorithm, that is, divide and conquer algorithm, piecemeal intervene in algorithm and triangle net growth algorithm. Each algorithm has its own advantage and disadvantage, Combined with the actual situation of the mining area, this paper adopts the constrained triangulated irregular net of one-time algorithm, through spatial data extraction, topological relations generation and spatial indexing generation, then finally builds up constrained triangulated irregular net within boundary line.