Height data Oslo building zone thinned 2014

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进行精细化描述。此类数据通过机载激光扫描（airborne laser scanning）或航空影像匹配技术生成点云（point clouds）。针对不同应用场景，该点云的点密度（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（数字地形模型，DTM, Digital Terrain Model）与地表高程模型（数字地表模型，DOM, Digital Surface Model）。