Height data NDH Leinavatn 2pkt 2020

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特征。该类数据可通过机载激光扫描生成点云（point clouds），或基于航空影像（aerial images）匹配获取点云。不同应用场景下，点云的密度（单位：点/平方米）存在差异。基于上述点云，可生成格网格式的地形数字地面模型（DTM, Digital Terrain Model）与地表数字表面模型（DOM, Digital Surface Model）。