Elevation data NDH Laksefjordvidda 4pkt 2018

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）可对地形与地表进行详尽描述。该类数据可通过机载激光扫描（airborne laser scanning）生成点云，亦可由航空影像（aerial images）匹配得到点云。针对不同应用场景，此类点云的密度（单位：点/平方米）存在差异。基于此类点云，可分别生成适配地形（DTM）与地表（DOM）的格网格式高程模型。