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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。
Due to the complicated and special topographical features of open-cut mines, the corresponding constraints should be fully considered in the process of modeling. Otherwise, there will be a phenomenon of steps being cut and equalized. In this paper, a one-time constrained triangle network generation algorithm is proposed. After spatial data extraction, topological relation establishment and spatial index establishment, finally, a constrained irregular triangular network within the boundary constrained line is established. An extended boundary concept is proposed to use the extended boundary and the above triangular network The algorithm can be used to build the local model and seamlessly integrate the local model with the overall model. Finally, the whole DEM model is updated.