露天矿精细DEM模型的建立及更新方法

Establishment and update of fine DEM for strip mine

由于露天矿复杂特殊的地形特征,在建模过程中应充分考虑相应的约束条件,否则会出现台阶被削平等现象。本文提出一次性约束三角网生成算法,经过空间数据提取、拓扑关系建立以及空间索引建立,最终建立起边界约束线以内的约束不规则三角网;并提出扩展边界概念,利用扩展边界及上述三角网生成算法,可实现局部模型建立以及局部模型与整体模型间的无缝拼接,最终完成整体DEM模型的更新。

Because of the complicated terrain feature of strip mine, corresponding constraint condition should he considered in the process of mndcling; otherwise the flight of steps will be cut. According to the actual situation of mining area, an algorithm for con- strained Delaunay triangulation establishment within one step was proposed in the paper. In this algorithm, constrained Delaunay trian- gulation was finally generated within boundary, thrnugh spatial data extraction, topological relations generation and spatial indexing generation. Since lhe amount of DEM data of the whole mining area is huge, fast updating of DEM should be considered and the con- cept of ~xtended bouudmy was proposed. Using the extended boundary and the construction algorithm of TIN, part model generation amt seamless splicing between part model and whole model could be achieved for the whole model update of DEM at last.