Height data NDH Selbu 2pkt 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).高程数据可详细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），或通过航空影像匹配获取点云。 不同应用场景下，点云的密度（单位：点/平方米）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, Digital Terrain Model）与地表高程模型（DOM, Digital Surface Model）。