一种快速生成 DSM 的不规则三角网构网新方法

摘要

A novel method for digital surface model (DSM)generation based on triangulation irregular net-work (TIN)is proposed in order to increase the efficiency.Firstly,by establishing the virtual grid and interpo-lation,an initial triangulation network is quickly generated in linear time.Secondly,the optimal TIN will be fi-nally acquired by optimizing the local data in the initial triangulation network.Finally,the high precision DSM is obtained by processing the redundant and intensive data.The experiment results not only indicate that the tri-angulation efficiency of the proposed algorithm is much higher than those algorithms available,but also prove the effectiveness of the proposed algorithm for DSM generation when facing large amount of data.%针对目前存在的不规则三角网（triangulation irregular network，TIN）构网效率较低的问题提出了一种新的生成数字表面模型（digital surface model，DSM）的构网方法。首先，通过建立虚拟格网和格网插值，在线性时间内快速建立初始三角网。然后，对初始三角网中局部少量数据优化得到最终的 TIN。最后，对数据进行冗余处理和密集处理，构造高分辨率的 DSM。实验结果表明，该算法的构网效率高于当前存在的 TIN 构网方法，对于大数据量的 DSM 生成具有良好的适用性。