Height data NDH Finse 4pkt 2019

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。该类数据可通过机载激光扫描（airborne laser scanning）或航空影像匹配（aerial image matching）的方式生成点云（point clouds）。
这些点云的密度（单位：每平方米点数，point/m²）因应用场景不同而有所差异。
基于上述点云，可生成地形与地表的栅格格式高程模型，即数字地形模型（Digital Terrain Model，DTM）与数字地表模型（Digital Surface Model，DOM）。