Journal of The School of Marine Science and Technology,Vol.2 No.1
Measurement accuracy of Airborne-Scanning LiDAR
on the Miho coast
Shin-ichirou YOKOYAMA,Mineo HIROMATSU,Junji KANEKO,
Yukihide AKIYAMA and Kenji NEMOTO
Abstract
Seashore erosion has started early in the1980s on the Sizuoka coast and went northeast gradually,finally took place on the Miho coast in1994.Seashore erosion is a serious problem not only on Sizuoka-Simizu coast but also on seashore around Japan.In order to solve this problem,quantitative analytical method for erosion process at the beach is urgently required.Airborne-Scanning LiDAR(Light Detection And Ranging),the method of being the short time land survey technology using an aircraft or helicopter,appears to be useful for this objective.Data from LiDAR and that from conventional leveling method using Total Station are compared in order to verify LiDAR system.The data from LiDAR were obtained in April and September2003,and compared with leveling data obtained at the about same period.The study area is classified into two areas according to the topographic characteristics which may cause differences of error in altitude.It turns out that the positioning error is found in data of LiDAR,the positioning by LiDER were shifted on the whole.Consequently,the average difference in altitude arising from two different method is11cm in the flat area,and12cm in the slope area.This indicates that a certain systematic error is included in LiDAR and that the accuracy by LiDER in a slope area does not significantly differ from that of the flat area.The same positioning error is also found in data obtained in September2003,and both average altitude differences were4cm after horizontal shifting.These differences are equal to each measurement error.Results indicate the positioning error may caused by GPS,IMU and the laser profiler,and it is also considered that the position error of the ground datum point used for compensation appears to be added.