Height data NDH Atna 2pkt 2016

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。此类数据以点云形式呈现，可通过机载激光扫描生成，或基于航空影像匹配构建。这些点云的点密度（单位：点/平方米）因应用场景不同而存在差异。基于上述点云，可生成栅格格式的地形高程模型（DTM，Digital Terrain Model）与地表高程模型（DOM，Digital Orthophoto Map）。