Height data Hafslund River Mapping Gol 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（Elevation data）可对地形与地表进行精细化刻画。 此类数据可通过机载激光扫描（airborne laser scanning）生成点云（point clouds），亦可通过航空影像（aerial images）匹配生成点云。 针对不同应用场景，点云的点密度（单位：点/平方米）存在差异。 基于此类点云，可生成格网格式的数字地形模型（DTM）与数字地表模型（DOM）。