Height data NDH Røros 2pkt 2016

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).

高程数据可精细化描述地形与地表。
该类数据可通过机载激光扫描生成点云（Point Cloud），或通过航空影像匹配获取点云。
针对不同应用需求，点云的密度（点/平方米）各不相同。
基于此类点云，可生成格网格式的地形（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。