一种顾及地形特征的山区LiDAR高精度DEM提取算法

An Algorithm for High Accuracy DEM Extraction Considering Topographic Features from LiDAR Data in Mountainous Areas

针对目前常规DEM插值算法无法很好地表达断裂区域地形细节的问题,提出了一种基于地形特征约束的高精度DEM插值算法。首先利用离散点构建无约束TIN,然后利用边缘检测算法提取地形断裂特征,并嵌入地形断裂线作为约束,构建约束TIN,在此基础上制作高精度DEM。最后,利用黄土高坡数据进行了DEM提取实验。结果证明,该算法较传统算法在地形细节的保留上更具优势。

A novel DEM interpolation algorithm considering topographic features was proposed in this paper, in order to settle the problem that conventional interpolation algorithm cannot express details well in fracture terrain area. First of all, an unconstrained TIN was generated by discrete ground point clouds. And then the terrain fracture characteristics, extracted by an edge detection algorithm, was utilized as a constraint condition to build a constrained TIN, And a precise DEM was generated by the constrained TIN. Finally, the LiDAR data of the loess plateau was used to extract DEM and the experiments showed that our algorithm was better than traditional algorithm on keeping terrain details.