Rapid elevation reconstruction method of linear suspended objects based on DEM

In view of the fact that the DEM data does not express the elevation of the surface attachments, in the process of the 3D scene reconstruction, problems of poor display effect such as sudden height jump and close to the ground at the suspended ground objects such as bridge and culver often arise. In order to solve this problem, this paper proposes a method that can automatically find the point where the ground object height jumps combined with the linear vector data, and automatically fill it according to the elevation at both ends to realize the rapid elevation reconstruction of the depression. Taking the 2 × 2 meter grid DEM data of Shandong Province as an example, it is found that this method has the advantages of automation and efficiency, and can well meet the display needs of linear feature in the terrain 3D scene.