Elevation data NDH Jotunheimen 2pkt 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).高程数据可对地形与地表进行精细化描述。此类数据可通过机载激光扫描（Airborne Laser Scanning）生成点云（Point Cloud），或基于航空影像（Aerial Images）匹配获取点云。针对不同应用需求，点云的点数密度（点/平方米）存在差异。基于该类点云，可生成栅格格式（Grid Format）的数字地形模型（Digital Terrain Model, DTM）与数字地表模型（Digital Surface Model, DOM）。