Height data NDH Norddal-Rauma 5pkt 2017

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形态。该类数据可通过机载激光扫描生成点云，或由航空影像匹配得到点云。此类点云针对不同应用需求，点密度（point/m²）各不相同。基于上述点云，可生成格网格式的地形高程模型（DTM，数字地形模型）与地表高程模型（DOM，数字地表模型）。