Elevation data NDH Otrøya 10pkt 2022

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）可精细化刻画地形与地表信息。该类数据可通过机载激光扫描或航空影像匹配的方式构建为点云数据。该点云的密度（单位：点/平方米）因应用需求不同而存在差异。基于该点云数据，可生成格网格式的地形（DTM，Digital Terrain Model）与地表（DOM，Digital Surface Model）高程模型。