Elevation data NDH Koppang 2 section 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).高程数据可精细化刻画地形与地表的形态特征。此类数据可通过机载激光扫描（airborne laser scanning）生成点云，或经由航空影像匹配获取点云。针对不同应用需求，点云的密度（单位：点/平方米）存在差异。基于上述点云，可生成栅格格式的数字地形模型（DTM）与数字地表模型（DOM）高程模型。