Height data NDH Kvænangen 2pkt 2016

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实现精细化描述。此类数据可通过机载激光扫描生成点云，或通过航空影像匹配得到点云。针对不同应用需求，这些点云的点密度（单位：点/平方米）各不相同。基于上述点云，可生成栅格格式的数字地形模型（DTM, Digital Terrain Model）与数字地表模型（DOM, Digital Surface Model）。