结合多源数据的路域精细DEM建模方法

探讨了道路施工造成的路域DEM变化区域的精细DEM建模方法。该方法首先把二维道路设计成果处理成三维的特征线要素，构建初始TIN；其次应用统计分析的方法内插求出实测点云中各点在初始TIN上的高程和实测高程之间的差异进行统计分析，验证并修改失真的三维特征线要素；然后与选取的少量地面观测点云构建变化区域的DEM，最终实现了路域变化区域精细DEM的构建方法。以杭瑞高速毕都（毕节至都格）段的道路设计成果和局部三维激光扫描数据为例开展了试验研究，研究表明该方法建立的路域DEM精度高、成本低、观测方式灵活，可广泛推广应用。

The Methodology on Building High-fidelity DEM in Road Domain Based on Multi-source Data

The road construction climax of reform and opening up 30 years has become one of the main reasons for the updating of DEM data in road domain.The paper discussed a methodology building high-resolution DEM based on the road design results, remote sensing image data before and after construction from google earth, terrestrial laser scanning point cloud.The demonstration was made based on the data of about 1 kilometer road in Bijie-Douge section of Hangzhou-Ruili expressway.The results showed that it was a feasible, fast and precise method based on the road design results in the road surface and side slope.The research showed that the method had the advantages of high precision, low cost and flexible observation mode, and can be widely used.