Altitude data Troms 5pkt 2015

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或航空影像匹配生成点云 (point clouds)。 针对不同应用场景，点云的密度（单位：点/平方米）存在差异。 基于上述点云，可生成地形 (DTM, Digital Terrain Model) 与地表 (DOM, Digital Orthophoto Map) 的栅格格式高程模型。