Elevation data Smådøla Åsaren 2006

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）可对地形与地表进行精细化刻画。此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）匹配得到点云。根据不同应用场景需求，这些点云的点密度（单位：点/平方米）存在差异。 基于上述点云，可针对地形（DTM）与地表（DOM）生成栅格格式的高程模型。