Elevation data Åseral Audnedal 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). 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实现精细化描述。该类数据可通过机载激光扫描（airborne laser scanning）获取点云（point clouds），或借助航空影像（aerial images）匹配生成点云。针对不同应用需求，此类点云的点密度（point/m²）存在差异。基于此类点云，可生成栅格格式的地形数字地形模型（Digital Terrain Model, DTM）与地表数字地表模型（Digital Surface Model, DOM）高程模型。高程数据可对地形与地表实现精细化描述。该类数据可通过机载激光扫描（airborne laser scanning）获取点云（point clouds），或借助航空影像（aerial images）匹配生成点云。 针对不同应用需求，此类点云的点密度（point/m²）存在差异。 基于此类点云，可生成栅格格式的地形数字地形模型（Digital Terrain Model, DTM）与地表数字地表模型（Digital Surface Model, DOM）高程模型。