Elevation data NDH Laksvatn and Nakkedalen 5pkt 2016

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（Elevation data）可精细化描述地形与地表。该类数据可通过机载激光扫描生成点云（point cloud），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，可生成栅格格式的数字地形模型（Digital Terrain Model, DTM）与数字地表模型（Digital Surface Model, DOM）。