Height data Narvik 2011

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开展精细化描述。此类数据可通过机载激光扫描获取点云（point clouds），或经由航空影像匹配生成点云。针对不同应用需求，这些点云的点密度（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高程模型（DTM，Digital Terrain Model）与地表高程模型（DOM，Digital Surface Model）。