Altitude data Romerike 2013

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开展精细化描述。该数据集可通过机载激光扫描（airborne laser scanning）生成点云（point cloud），或通过航空影像匹配获取点云以完成构建。不同应用场景下，点云的密度各不相同，单位为点/平方米。基于上述点云，可生成两类网格格式的高程模型：地形高程模型（DTM，Digital Terrain Model）与地表高程模型（DOM，Digital Orthophoto Map）。