The impact of sea state condition on airborne lidar bathymetry measurements

Karlsson, Torbjorn; Pe’eri, Shachak; Axelsson, Andreas

doi:10.1117/12.920608

Cited by 6 publications

(3 citation statements)

References 4 publications

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“…This kind of sensors where typically used for bathymetric measurements in high-transparency lagoons and open sea environments [15][16][17][18][19][20] and highly transparent rivers [21,22]. Several applications of LiDAR bathymetry for the European sea show potential of this technology being operational method for surveying shallow water of coastal zone [20,23]. Limitation effects caused by waves [23,24], water transparency [24,25], and algae development [20,26] have been noticed.…”

Section: Introductionmentioning

confidence: 99%

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Coupling of Dual Channel Waveform ALS and Sonar for Investigation of Lake Bottoms and Shore Zones

et al. 2021

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In this work, we proposed to include remote sensing techniques as a part of the methodology for natural lake bottom mapping, with a focus on the littoral zone. Due to the inaccessibility of this zone caused by dense vegetation, measurements of the lake bottom and the coastline are also difficult to perform using traditional methods. The authors of this paper present, discuss and verify the applicability of remote sensing active sensors as a tool for measurements in the shore zone of a lake. The single-beam Lowrance HDS-7 ComboGPS echosounder with an 83/200 kHz transducer and a two-beam LiDAR RIEGL VQ-1560i-DW scanner have been used for reservoir bottom measurements of two neighboring lakes, which differ in terms of water transparency. The research has found a strong correlation between both sonar and LiDAR for mapping the bottom depth in a range up to 1.6 m, and allowed LiDAR mapping of approximately 20% of the highly transparent lake, but it has not been found to be useful in water with low transparency. In the light of the conducted research, both devices, sonar and LiDAR, have potential for complementary use by fusing both methods: the sonar for mapping of the sublittoral and the pelagic zone, and the LiDAR for mapping of the littoral zone, overcoming limitation related to vegetation in the lake shore zone.

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Section: Introductionmentioning

confidence: 99%

“…Several applications of LiDAR bathymetry for the European sea show potential of this technology being operational method for surveying shallow water of coastal zone [20,23]. Limitation effects caused by waves [23,24], water transparency [24,25], and algae development [20,26] have been noticed.…”

Section: Introductionmentioning

confidence: 99%

Coupling of Dual Channel Waveform ALS and Sonar for Investigation of Lake Bottoms and Shore Zones

et al. 2021

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“…Numerous researchers have carried out theoretical and experimental investigations of oceanic surface waves’ influence on laser propagation. The relationship between sea surface conditions and the accuracy of airborne LiDAR bathymetry (ALB) was investigated at [ 10 , 34 , 35 ]. In [ 1 ], they experimentally demonstrated high-speed optical wireless communication for both the uplink and downlink by employing an OFDM transmission of 32-QAM and single-mode pigtailed green-light laser diode (LD).…”

Section: Laser Propagation At the Air–sea Interfacementioning

confidence: 99%

Impact of a Turbulent Ocean Surface on Laser Beam Propagation

Alharbi

Kane

Henderson

2022

Sensors

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The roughness of the ocean surface significantly impacts air-to-sea imaging, oceanographic monitoring, and optical communication. Most current and previous methods for addressing this roughness and its impact on optical propagation are either entirely statistical or theoretical, or are ‘mixed methods’ based on a combination of statistical models and parametric-based physical models. In this paper, we performed experiments in a 50-foot-wave tank on wind-generated waves, in which we varied the wind speed to measure how the surface waves affect the laser beam propagation and develop a geometrical optical model to measure and analyze the refraction angle and slope angle of the laser beam under various environmental conditions. The study results show that the laser beam deviations/distortions and laser beam footprint size are strongly related to wind speed and laser beam incidence angle.

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