Height data Leka archaeology 2010

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 Cloud），亦可通过航空影像（aerial images）匹配构建点云数据集。该点云的点密度（单位：点/平方米）因应用场景不同而存在差异。基于上述点云，可生成格网格式的地形高程模型（Digital Terrain Model，DTM）与地表高程模型（Digital Surface Model，DOM）。