Normalized digital surface model (LiDAR 2014)

The normalized digital surface model is the result of the difference calculation between the DOM (raster data) and DTM (raster data) from 2014 (LiDAR). The data has a resolution of 50 cm.归一化数字表面模型（normalized digital surface model）为2014年激光雷达（LiDAR）采集的数字正射影像图（Digital Orthophoto Map，简称DOM，栅格数据）与数字地形模型（Digital Terrain Model，简称DTM，栅格数据）进行差值运算后的结果。该数据的空间分辨率为50厘米。