机载激光雷达在大比例尺DEM生产中的应用

The Application of Airborne LiDAR in Large Scale DEM Production

针对传统测绘方法无法满足当今时代对于精准、快速、翔实获取大比例尺数字高程模型(Digital Elevation Model,DEM)数据的局限性,分别使用无人机载激光雷达和倾斜摄影测量方式对某典型试验区进行数据采集,并构建DEM,然后采用传统全野外数字化测量方法对所构建的DEM进行精度校核。通过综合对比以上3种作业方式发现,机载激光雷达技术能够满足1∶500 DEM的精度要求,且优于倾斜摄影测量。其在大比例尺DEM生产中具有速率快和成本低的优越性,且能够获取植被茂盛区域的DEM数据。

In view of the limitations of traditional surveying and mapping methods to obtain large-scale DEM data accurately,quickly and detailedly,this experiment applied unmanned airborne LiDAR and tilt photogrammetry to collect data from a typical test area,and constructed the corresponding DEM.Then,the accuracy of the large-scale DEM was checked by using the traditional field digital mapping method.Through the comprehensive comparison of the above three operation modes,it was found that airborne LiDAR technology could meet the accuracy requirements of 1:500 DEM,and was better than tilt photogrammetry.It has the advantages of fast speed and low cost in large-scale DEM production,and can obtain DEM data in the area with abundant vegetation.