IMPROVEMENT OF THE ACCURACY OF SURVEY USING ALB AND EXAMINATION OF THE DATA GAP INFLUENCE ON HYDRAULIC ANALYSIS

Abstract

 In recent years, river survey with Airborne LiDAR Bathymetry (Hereafter, ALB) have been growing, and the utilization of three-dimensional data for river management is expected. This paper shows the possibility of improving the accuracy of longitudinal survey obtained only by point cloud to about ± 1cm by appropriately processing the systematic error of ALB data based on the purpose of river management and characteristics of equipment. And, this paper verifies the effect of the missing rate of ALB data on hydraulic analysis in mountainous rivers, and as an example, the mesh size of the ground height required to reduce the relative deviation of the calculated water level to about 10%