INVESTIGATION ON THE SURVEYING METHOD OF WAVE DISSIPATING BLOCKS USING UAV

UAV Photogrammetry plays a major role in labor saving by unmanned operation, ensuring work safety and this survey method has been widely used in the land construction sites. According to the Survey Manual published by Geospatial Information Authority of Japan, it is required to set up Reference Control points in the target survey area for geo-referencing. However in case of the survey of wave dissipating blocks, one of the widely used harbor structures, it is difficult to set up the reference control points on the wave dissipating blocks because of the safety management issues. In this paper, the measurement accuracy of the wave dissipating blocks by UAV Photogrammetry without the Reference Control Points is verified by the applicability of the results of UAV Measurement Survey. As a result, this suggested method has an error of 10cm or less and measurement results could be expected to be used for surveying the output forms during construction and the disaster damage assessment.