基于机载LiDAR数据的鄱阳湖地区高精度DEM生产研究

大面积湖泊周边地势平坦,利用航空摄影等常规手段实现此类地区精细DEM生产,需要依靠外业控制和大量人工编辑,作业周期长,成本高。本文结合国家基础航空摄影项目,基于ALS60完成了鄱阳湖地区大面积机载LiDAR数据的获取及预处理,并通过地面检校和精度验证,对传感器的系统误差进行修正,在此基础上对点云数据进行精细化处理及DEM高效生产,产品精度满足测绘相关规范要求。该项目的成功开展,为基于航空新型技术手段的大面积湖泊周边等常规作业困难地区的高精度测绘提供了借鉴。

Research on High Precision DEM Prod uction in Poyang Lake Based on Airborne LiDAR Data

A precise DEM production using aerial photography or other conventional means , is mainly depended on field work control-ling and a large number of manual editing in the large and flat lake area , which is a time consuming and high cost work.With the ap-petite from national basic aerial photography project, the ALS60 system with airborne LiDAR technique is adopted to LiDAR data ac-quisition in Poyang Lake area.This paper begins with the data acquisition and pre-processing.This is succeeded by the ground truth verification and accuracy assessment, including error correction for sensor system.Finally the point cloud data is processed to DEM production.Result shows that the precision of DEM products meet the relevant criterions in surveying and mapping industry.The suc-cessful development of the project provides experiences in high precision mapping in areas where conventional methods are ineffective and other large lake areas.