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Correction for depth biases to shallow water multibeam bathymetric data |
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| Authors: | Fan-lin Yang Jia-biao Li Zhi-min Liu Li-tao Han |
| Institution: | 121. Geomatics College, Shandong University of Science and Technology, Qingdao, 266590, China 221. Key Laboratory of Surveying and Mapping Technology on Island and Reef, NASG, Qingdao, 266590, China 321. Key Laboratory of Submarine Geosciences of State Oceanic Administration, Hangzhou, 310012, China |
| Abstract: | Vertical errors often present in multibeam swath bathymetric data. They are mainly sourced by sound refraction, internal wave disturbance, imperfect tide correction, transducer mounting, long period heave, static draft change, dynamic squat and dynamic motion residuals, etc. Although they can be partly removed or reduced by specific algorithms, the synthesized depth biases are unavoidable and sometimes have an important influence on high precise utilization of the final bathymetric data. In order to confidently identify the decimeter-level changes in seabed morphology by MBES, we must remove or weaken depth biases and improve the precision of multibeam bathymetry further. The fixed-interval profiles that are perpendicular to the vessel track are generated to adjust depth biases between swaths. We present a kind of postprocessing method to minimize the depth biases by the histogram of cumulative depth biases. The datum line in each profile can be obtained by the maximum value of histogram. The corrections of depth biases can be calculated according to the datum line. And then the quality of final bathymetry can be improved by the corrections. The method is verified by a field test. |
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