Elevation data Viken 2022 – Østfold 10pkt

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).高程数据可精细化刻画地形与地表的形态特征。该类数据可通过机载激光扫描生成点云（point clouds），或由航空影像匹配得到点云。针对不同应用需求，点云的密度（单位：点/平方米）存在差异。基于上述点云，可生成地形（DTM，Digital Terrain Model）与地表（DOM，Digital Surface Model）的格网式高程模型。