Evaluation of intertidal single-beam bathymetric spatial interpolation accuracy based on UAV photogrammetry

doi:10.3969/j.issn.1001-909X.2024.01.008

Abstract

Abstract:

Aiming at the problems of difficulty in verifying the accuracy of the interpolation model of single-beam bathymetric data, a method based on high-precision UAV data to verify the accuracy of the interpolation model was proposed by using the intertidal tidal law. At low tide, UAV photogrammetry was used to construct a high-precision digital surface model (DSM) of the intertidal zone, and at high tide, the single-beam bathymetry data was obtained and the three-dimensional coordinates of the intertidal topographic points were calculated by combining the global navigation satellite system (GNSS) technology, and constructed an intertidal digital elevation model (DEM) by using the following 4 interpolation methods: Kriging, inverse distance weight, completely regularized spline and natural neighborhood interpolation method. Based on UAV data, the accuracy analysis of intertidal zone DEM was carried out. The results show that: (1) PPK technology-assisted UAV photogrammetry can construct high-precision intertidal zone DSM. (2) In the intertidal zone, UAV data can be used as an evaluation criterion for the accuracy of single-beam bathymetry data. (3) When the seabed topography is relatively flat, the completely regularized spline method has higher accuracy than the other three methods, and the coarse difference rate is 12.5%.

Key words: single-beam bathymetry, completely regularized spline, Kriging method, UAV, intertidal zone, PPK

CLC Number:

P229

MA Haibo, LAI Xianghua, HU Taojun, FU Xiaoming. Evaluation of intertidal single-beam bathymetric spatial interpolation accuracy based on UAV photogrammetry[J]. Journal of Marine Sciences, 2024, 42(1): 83-90.

Figures/Tables 7

Fig.1 Schematic diagram of the study area

Tab.1 Single-beam sounder parameters

规格型号	项目	技术指标
HY1601单频测深仪	工作频率	208 kHz
	分辨率	0.01 m
	最大水深	0.3~300 m
	测深精度	1 cm±0.1%×水深

Fig.2 The photogrammetry data of UAV generates an intertidal digital orthophoto (a) and a digital surface model (b)

Tab.2 Accuracy of intertidal digital surface model

特征点号/中误差	△x/m	△y/m	△z/m
1	-0.009	-0.001	-0.083
2	0.022	0.002	-0.018
3	-0.013	0.003	0.057
4	0.016	-0.004	0.033
5	0.020	-0.011	0.041
6	-0.016	-0.004	0.098
中误差	0.017	0.005	0.068

Fig.3 Elevation difference of underwater terrain points among the digital surface model obtained by UAV and single-beam bathymetry method

Fig.4 Digital elevation model of the intertidal zone based on single-beam bathymetric data using four interpolation methods

Fig.5 Elevation difference statistics of 200 terrain points in the digital elevation model constructed by four interpolation methods based on single-beam bathymetric data and the digital surface model constructed by UAV

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