Analysis of scanning systematic errors for airborne laser bathymetry

Libin Du; Tong Cui; Xiangqian Meng; Yibo Yuan; Liwei Wang; Zhiwei Shang; Hao Chen; Hongzhi Huang

doi:10.1364/AO.494179

Applied Optics
Vol. 62,
Issue 26,
pp. 6939-6951
(2023)
•https://doi.org/10.1364/AO.494179

Analysis of scanning systematic errors for airborne laser bathymetry

Libin Du, Tong Cui, Xiangqian Meng, Yibo Yuan, Liwei Wang, Zhiwei Shang, Hao Chen, and Hongzhi Huang

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Libin Du, Tong Cui, Xiangqian Meng, Yibo Yuan, Liwei Wang, Zhiwei Shang, Hao Chen, and Hongzhi Huang, "Analysis of scanning systematic errors for airborne laser bathymetry," Appl. Opt. 62, 6939-6951 (2023)

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Abstract

For the Palmer mechanical scanning pattern of an airborne laser bathymetry system, the potential errors of the scanning system are analyzed, and the associated error model is derived. The model composes the description of laser rays, water surface fluctuations, and refraction, and introduces certain simplifications concerning the water surface and column. Based on the scanning error model, the impact of each error source on the vertical and horizontal positioning accuracy is investigated and established through a numerical simulation. The quantitative impacts of each inaccuracy on the coordinates of the laser footprints on the sea surface and bottom were calculated, with a height of 100 m for the airborne platform and a water depth of 10 m. To verify the correctness of the simulation results and the error model based on a theoretical analysis, experiments are utilized with the system that we developed. Both the simulation analysis and experimental results show that this method can effectively obtain the systematic errors. The outcomes of the error model and analysis will give the theoretical foundations for lowering the effect brought on by each error source in the compensation scanning system and improving the point cloud accuracy in the ensuing data processing.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Equations (18)

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Adjustment of the Angle Value (°)	Coordinate after Y Direction Adjustment (cm)	Coordinate after Z Direction Adjustment (cm)	Average Value in Y (cm)	Average Value in Z (cm)	Error Value in Y (cm)	Error Value in Z (cm)
0.298	(12.8,35)	(24.8,19.5)
0.298	(13.1,35.2)	(25.3,20)	(13.1,35.2)	(25.2,19.9)	(0.1,16.2)	(12.2,0.9)
0.298	(13.5,35.3)	(25.5,20.2)
0.596	/	(39.7,18.8)
0.596	/	(39.5,19.5)	/	(39.7,19.4)	/	(26.7,0.4)
0.596	/	(40,20)

	Experimental Data		Simulation Data
Angle (°)	X (m)	Y (m)	X (m)	Y (m)
14	−38.78	−7.78	−38.60	−8.28
28	−34.67	−14.95	−34.95	−14.60
42	−28.41	−20.75	−28.20	−20.90
84	−1.24	−28.16	−1.56	−28.16
98	8.63	−27.05	8.71	−27.03
140	31.96	−16.03	32.05	−15.94

	Experimental Data		Simulation Data
Angle (°)	X (m)	Y (m)	X (m)	Y (m)
3	−40.14	−1.51	−40.16	−1.13
9	−39.64	−4.89	−39.71	−4.61
15	−38.63	−8.20	−38.70	−8.02
21	−37.12	−11.38	−37.17	−11.29
27	−35.13	−14.37	−35.13	−14.37
33	−32.71	−17.14	−32.63	−17.22

Water	X (m)			Y (m)
Depth (m)	Min	max	RMS	Min	max	RMS
5.2	0	0.0988	0.0400	0	0.0567	0.0273
5.4	0.00035	0.1086	0.0493	0	0.0794	0.0385
5.6	0	0.0760	0.0384	0	0.0601	0.0241
5.8	0.00016	0.0867	0.0396	0	0.0583	0.0239
6	0	0.1008	0.0461	0	0.0615	0.0292

Adjustment of the Angle Value (°)	Coordinate after Y Direction Adjustment (cm)	Coordinate after Z Direction Adjustment (cm)	Average Value in Y (cm)	Average Value in Z (cm)	Error Value in Y (cm)	Error Value in Z (cm)
0.298	(12.8,35)	(24.8,19.5)
0.298	(13.1,35.2)	(25.3,20)	(13.1,35.2)	(25.2,19.9)	(0.1,16.2)	(12.2,0.9)
0.298	(13.5,35.3)	(25.5,20.2)
0.596	/	(39.7,18.8)
0.596	/	(39.5,19.5)	/	(39.7,19.4)	/	(26.7,0.4)
0.596	/	(40,20)

Abstract

Data availability

Cited By

Figures (18)

Tables (4)

Equations (18)

Applied Optics