Height data Deep pollen 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）或航空影像匹配的方式生成点云（point clouds）数据集。 为适配不同应用需求，点云的点密度（点/平方米）存在差异。 基于上述点云数据集，可生成格网格式的数字地形模型（Digital Terrain Model, DTM）与数字地表模型（Digital Surface Model, DOM）。