Height data Hægebostad 2010

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）可对地形与地表开展精细化描述。该类数据可通过机载激光扫描（airborne laser scanning）生成点云（point clouds），或由航空影像（aerial images）通过匹配处理得到点云。针对不同应用场景，此类点云的点密度（单位：点/平方米）存在差异。基于上述点云，可生成网格格式的高程模型，其中包括面向地形的数字地形模型（Digital Terrain Model, DTM）与面向地表的数字地表模型（Digital Surface Model, DOM）。