Altitude data Sirdal 2014

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). 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。该类数据可通过机载激光扫描生成点云，或通过航空影像匹配构建点云。针对不同应用需求，点云的点密度（点/平方米）有所差异。基于此类点云，可生成网格格式的数字地形模型（Digital Terrain Model，DTM）与数字地表模型（Digital Surface Model，DOM）。 高程数据可对地形与地表进行精细化描述。该类数据可通过机载激光扫描生成点云，或通过航空影像匹配构建点云。 针对不同应用需求，点云的点密度（点/平方米）有所差异。 基于此类点云，可生成网格格式的数字地形模型（DTM）与数字地表模型（DOM）。