Elevation data RV13 Skare-Sogndal mobile 2021

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刻画。 该类数据可通过机载激光扫描生成点云，或借助航空影像匹配获取点云。 针对不同应用需求，点云的密度（单位：点/平方米）存在差异。 基于上述点云数据，可生成两类网格格式的高程模型：对应地形的数字地形模型（Digital Terrain Model, DTM）与对应地表的数字表面模型（Digital Surface Model, DOM）。