Elevation data NDH Vikna 5 section 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).高程数据可详细刻画地形与地表特征。该类数据通过机载激光扫描（Airborne Laser Scanning）或航空影像匹配生成点云（Point Clouds）。 不同应用场景下，点云的点密度（点/平方米）存在差异。 基于上述点云，可生成格网形式的地形数字高程模型（DTM, Digital Terrain Model）与地表数字高程模型（DOM, Digital Surface Model）。