Height data Eigersund 2011

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），或基于航空影像匹配获取点云。针对不同应用需求，此类点云的密度（点/平方米）存在差异。基于上述点云，可生成栅格格式的高程模型，涵盖地形类的数字地形模型（Digital Terrain Model，DTM）与地表类的数字地表模型（Digital Surface Model，DOM）。