Elevation data NDH Tverrfjellet 4pkt 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).高程数据可精细化描述地形与地表。此类数据可通过机载激光扫描获取点云，或通过航空影像匹配生成点云。针对不同应用需求，点云的密度（point/m²）存在差异。基于上述点云，可生成格网格式的地形（DTM，Digital Terrain Model）与地表（DOM，Digital Orthophoto Map）高程模型。