Application of LiDAR Data in Water Conservancy DLG Production
Based on engineering examples,the main process of producing DLG using LiDAR data is introduced,and it is demonstrated that the results of produced DLG using DEM generated by DOM and point cloud filtering fully meet the accuracy requirements of 1∶1000 scale topographic map. Moreover,the image data is produced using high-accuracy inertial navigation of LiDAR and POS from GPS data,which can fully achieve image control point free adjustment. Comparison between laser point cloud filtering DEM and aerial photography DEM reveals that for areas with dense vegetation and narrow water channels,point cloud filtering DEM data can ac-curately obtain elevation information,while aerial photography DEM data cannot.
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