Elevation data Photo Finnmarksvidda 2021 Part 1 of 5

Elevation data provides a detailed description of terrain and surface. The data are established as point clouds from airborne laser scanning or matching from aerial images. The point clouds have varying density (point/m²) for different purposes. From the point clouds, elevation models are generated on grid format of terrain (DTM) and surface (DOM).高程数据可精细化描述地形与地表特征。该类数据通过机载激光扫描或航空影像匹配的方式生成点云（point clouds），其点密度（单位：点/平方米）因应用场景不同而存在差异。基于上述点云，可生成格网格式的地形高程模型（DTM，Digital Terrain Model）与地表高程模型（DOM，Digital Surface Model）。