Height data NDH Langsua 4pkt 2017

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，亦可由航空影像匹配获取点云。依据不同应用需求，这些点云的点密度（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，Digital Terrain Model, DTM）与地表高程模型（数字地表模型，Digital Surface Model, DOM）。