Height data NDH Skorovatn 2pkt 2019

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。 此类数据可通过机载激光扫描生成点云（Point Clouds），或通过航空影像匹配获取点云。 针对不同应用场景，这类点云的点密度（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（Digital Terrain Model, DTM）与数字表面模型（Digital Surface Model, DOM）两类高程模型。