UAV Photogrammetry for Beach Topography Surveying

• Main Authors: Shih-Peng Chiang, 蔣士朋
• Other Authors: Sung-Shan Hsiao
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/j3e763

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 105 === The rationality of the special planning in coastal areas requires to grasp primarily the change mechanism of site topography. Therefore, this research takes the advantages of direct field measurements and indirect remote sensing, and Unmanned Aerial Vehicle(UAV) which is convenient to carry, flying at low altitude and moving quickly, Global Position System(GPS) and Position and Orientation(POS) of Inertial Measurement System(IMU) are combined and used as measurement tools to monitor the beach topography. Image feature point can be matched out and point location (PL) of relative sand topography can be achieved through image technology of aero photogrammetry and aero triangulations methods, then coordinating with Virtual Base Station RTK (VBS-RTK) and Ground Control Point(GCP) to survey coordinates and to correct actual coordinates for achieving PL of actual sand topography and further comparing the terrain variance between the image matching point cloud and direct results of measurements. The results showed that the ground resolution(GSD) is 3.26cm, the average elevation error is with 3.20m, RMSE is with 0.169m, and the correlation index is 0.990 at the place with flight height of 70 meters,which is in accordance with the certification standard of ±25 cm difference of elevation stipulated in relative laws and regulations of Water Resources Agency. The results of this research serve to improve the efficiency of traditional artificial sampling and reduce the cost of using indirect surveying observation, achieving the reduction of error problems in measurements and measurement cost saving.