An algorithm for extracting airborne LiDAR bathymetric travel time in water column based on seabed echo enhancement

Zhang Yiheng; Yu Xiaolin; Qi Chao; Su Dianpeng; Wang Zhiliang; Ren Guozhen

doi:10.12284/hyxb2023167

Volume 45 Issue 12

Dec. 2023

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Zhang Yiheng，Yu Xiaolin，Qi Chao, et al. An algorithm for extracting airborne LiDAR bathymetric travel time in water column based on seabed echo enhancement[J]. Haiyang Xuebao，2023, 45(12)：145–155 doi: 10.12284/hyxb2023167

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An algorithm for extracting airborne LiDAR bathymetric travel time in water column based on seabed echo enhancement

doi: 10.12284/hyxb2023167

Zhang Yiheng^{1, 2
,},
Yu Xiaolin¹,
Qi Chao¹,
Su Dianpeng^{1, 2, 3
,
,},
Wang Zhiliang²,
Ren Guozhen⁴

1.
College of Geodesy and Geomatics, Shandong University of Science and Technology, Qingdao 266590, China
2.
Key Laboratory of Marine Environmental Exploration Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China
3.
Shanghai Institute of Optics and Fine Mechanics, Chinese Acadeny of Sciences, Shanghai 201800, China
4.
Shandong Ruizhi Flight Control Technology Limited Company, Qingdao 266590, China

Received Date: 2023-04-17
Rev Recd Date: 2023-10-07

Available Online: 2023-12-29

Publish Date: 2023-12-01

Abstract

Abstract

The airborne LiDAR bathymetry (ALB) technology has the advantages of high precision, high efficiency, strong mobility and dual use of water and land. It is especially suitable for the rapid detection of complex terraforming in shallow waters such as coastal zones, islands and reefs. When the laser penetrates the water, the energy will attenuate rapidly, which makes it difficult to extract part of the seabed echo effectively and distinguish the true position of the sea bottom. Therefore, an airborne LiDAR bathymetric travel time in the water column extraction algorithm based on echo enhancement is proposed in this paper. The Gold deconvolution algorithm was used to restore the cross section shape of the target and determine the initial range of the seabed. Then, the effective range of backscattering was fitted by double exponential function, and the diffuse attenuation coefficient K_d was obtained. Finally, combined with the seabed LiDAR equation, the waveform in the initial range of the seabed is enhanced by K_d value, and the enhanced echo is decomposed by Gaussian function to determine the seabed position parameters, so as to realize the travel time in the water column extraction of ALB waveform. The feasibility of the proposed algorithm was verified by using the experimental data of RIEGL VQ-840-G ALB in Qingdao Jiaozhou Bay, and the proposed algorithm was compared with the Richardson-Lucy deconvolution model and the peak detection model. The results show that the root mean square error (RMSE) between the proposed algorithm and the single-beam point with the same name is 18.5 cm, which is 29.9% and 41.4% lower than the above two algorithms, respectively. Therefore, the proposed algorithm is feasible and can satisfy the high precision extraction of ALB waveform during water column traveling, which can provide certain technical support for the fine processing of airborne LiDAR bathymetry data.
- airborne LiDAR bathymetry,
- travel time in the water column,
- Gold deconvolution,
- diffuse attenuation coefficient,
- seabed echo enhancement

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References(34)

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