Height data NDH Flesberg-Rollag-Øvre Eiker 5pkt 2017

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（Elevation data）可对地形与地表进行精细化描述。
此类数据可通过机载激光扫描（airborne laser scanning）生成点云（Point Clouds），或由航空影像（aerial images）匹配得到点云。
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，可生成栅格格式的数字地形模型（DTM, Digital Terrain Model）与数字地表模型（DOM, Digital Surface Model）。