Infrared and Laser Engineering, Volume. 52, Issue 2, 20220366(2023)
ICESat-2 lidar sea surface signal extraction and ocean wave element calculation
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Fig. 6. The sea surface signal extraction results: the red points are the original point clouds, and the black points are the sea surface signal points extracted by the method in this paper. (a1) Daytime original point cloud; (a2) Extracted result of daytime point cloud; (b1) Nighttime original point cloud; (b2) Extracted result of nighttime point cloud
Fig. 7. (a) Result of obtaining the sea surface profile; (b) Enlarged view of the blue box area of the obtained result of the sea surface profile
Fig. 8. Amplitude-frequency diagram of sea surface profile obtained by FFT transformation
Table 1. Parameters and calculation results of the study area
View tableView in ArticleTable 1. Parameters and calculation results of the study area
Parameters Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7 Longitude (°E) 110.79 110.63 110.59 110.66 109.72 109.75 109.79 Latitude (°N) 5.59 7.25 7.24 7.26 17.08 17.08 17.08 ATLAS beam number gt2r gt2r gt1r gt1r gt1r gt2r gt3r Time Night Night Night Day Day Day Day Water depth/m 470 1900 1850 1880 180 240 300 Wind speed/m·s−1 2.0 2.9 2.9 5.6 5.6 5.6 5.6 Peak period calculated in this paper/s 8.20 8.01 8.47 4.10 6.60 6.76 6.60 ERA5 peak period/s 8.10 8.07 8.07 4.48 6.56 6.56 6.56 Absolute error/s 0.1 0.06 0.40 0.38 0.04 0.2 0.04 Relative error 1.2% −0.7% 4.9% −8.4% 0.6% 3.0% 0.6%
Table 2. Comparison of peak wave period errors calculated by the method in this paper and the sea surface signal photons extracted with the official ATL03 high confidence data
View tableView in ArticleTable 2. Comparison of peak wave period errors calculated by the method in this paper and the sea surface signal photons extracted with the official ATL03 high confidence data
Signal photon’s source Site 1 Site 2 Site 3 Site 4 Site 5 Site 6 Site 7 Data time Night Night Night Day Day Day Day Calculated by this paper’s method 1.20% −0.70% 4.90% −8.40% 0.60% 3.00% 0.60% Calculated based on ATL03 high confidence data 0.37% −4.34% 4.96% 368.75% 0.61% 18.29% 9.15%
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Zhibiao Zhou, Hui Zhou, Yue Ma, Yue Song, Song Li. ICESat-2 lidar sea surface signal extraction and ocean wave element calculation[J]. Infrared and Laser Engineering, 2023, 52(2): 20220366
Paper Information
Category: Lasers & Laser optics
Received: May. 27, 2022
Accepted: --
Published Online: Mar. 13, 2023
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