Height data Holtålen 2014

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).

高程数据可精细化刻画地形与地表的形态特征。该类数据可通过机载激光扫描（Airborne Laser Scanning）生成点云，或通过航空影像（Aerial Images）匹配得到点云。
针对不同应用场景，这些点云的密度（点/平方米）存在差异。
基于上述点云，可生成格网格式的地形高程模型（数字地形模型，Digital Terrain Model, DTM）与地表高程模型（数字地表模型，Digital Surface Model, DOM）。