Height data Hafslund River Mapping Hovet 2015

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).高程数据可对地形与地表实现精细化描述。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。此类点云的密度（点/平方米）因应用需求不同而存在差异。基于上述点云，可生成格网格式的数字地形模型（DTM, Digital Terrain Model）与数字地表模型（DOM, Digital Surface Model）。