For example, the visible errors between DEMs of LiDAR and photogrammetry usually occur in rough terrain or mountain ridges, where the maximum error ups to 20 m.

• 从比较中也可看出不同方式制作的DEM所产生的误差，例如光达点云的过滤使山脊部份过度平滑、航测DEM错估植被覆盖的高度等误差问题。