河川堤防計測へのモバイルマッピングシステムの適用

抄録

Recently Mobile Mapping System (MMS) is used for variety applications such as three-dimensional road facility mapping, road maintenance and disaster risk management. The application of MMS to maintenance and management of river embankments has also been studied so far. The three-dimensional coordinates of the laser point cloud data obtained from MMS are calculated based on the position and orientation of MMS that are measured by GNSS, IMU and odometer. Analysis of the position of MMS is carried out by RTK method or networked RTK method such as FKP (Flächen Korrektur Parameter) method and VRS (Virtual Reference Station) method. In the GNSS analysis, longer base line decreased accuracy due to ionospheric and tropospheric delay. In this study, we verified the difference of positioning accuracy depending on the GNSS analysis method and considered the optimal measurement conditions to apply MMS to monitoring the river embankment. In addition, based on the three-dimensional laser point cloud, we investigated the accuracy of the height of the embankment crest and the profile of the river embankment by using our proposed methods. In this paper, we demonstrate the required measurement conditions and the effective data processing for the river embankment measurement by MMS.