Hole repair method and accuracy analysis of digital elevation model for airborne LiDAR
In response to the inevitable generation of data holes during the scanning process of LiDAR due to factors such as ground object occlusion,laser scattering,and complex terrain,which can lead to poor local quality of the generated DEM,this paper proposes to detect the boundaries of grid holes on the basis of LiDAR data TIN gridding,and add triangular patches according to the threshold on the feature plane.Combined with radial basis functions,the grid nodes are adjusted to implicit surfaces,Complete hole repair.The experiment utilizes the obtained airborne LiDAR point cloud data in mountainous areas to perform hole instance repair on grid models and carry out hole repair on different terrains and micro landforms,generating corresponding DEM and analyzing the accuracy of the mesh hole model repair effect.The results indicate that the larger the terrain complexity index and hole area,the lower the accuracy of hole repair;In the mountainous experimental area,when the terrain complexity is ≤ 0.5 and the hole area is ≤ 200 m2,the repair accuracy can meet the requirements of 1∶500 DEM products,1∶1000 for ≤ 500 m2,and 1∶2000 for ≤ 1000 m2.
万方数据
维普
