Traditional large scale topographic mapping uses aerial photography,however,this method is limited to several external factors,for instance,the density of vegetation coverage,the photogrammetry projection error and the image shades,etc. Airborne-LiDAR uses Laser shots to fetch the information on earth. The Laser point holds three-dimension-al information and intensity of echo,this characteristic just makes up the short come of Traditional method. This article does research on large scale topographic mapping in mountain city using airborne-LiDAR data. In this case study,we found a normal production process and analyzed the accuracy of the results. The conclusion shows the result accuracy can be used for 1 : 2000 scale topographic mapping.%传统大范围的大比例尺地形图测制多采用航测的方法，但基于航摄影像匹配的航测方法本身存在着一定的局限性，机载LiDAR通过激光回波获取信息，激光具有一定的穿透性，在植被覆盖的区域也能获取一定数量的地面反射激光点；激光点云本身记录了三维坐标信息，各种物体顶部的激光点不存在投影差的问题，LiDAR数据的特点正好能弥补航摄影像的不足之处。本文通过研究基于机载LiDAR数据配合高分辨率数字正射影像在山地城市测制大比例尺地形图，探索出一套生产方法流程，以重庆测区为例，分析了该方法的可行性并对测图成果精度进行了系统性分析，结果表明，本试验中要素精度和DEM精度可以达到1：2000的测图要求。
展开▼
