Comparison of airborne lidar measurements with 420 kHz echo-sounder measurements of zooplankton

James H. Churnside; Richard E. Thorne

doi:10.1364/AO.44.005504

Applied Optics
Vol. 44,
Issue 26,
pp. 5504-5511
(2005)
•https://doi.org/10.1364/AO.44.005504

Comparison of airborne lidar measurements with 420 kHz echo-sounder measurements of zooplankton

James H. Churnside and Richard E. Thorne

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James H. Churnside and Richard E. Thorne, "Comparison of airborne lidar measurements with 420 kHz echo-sounder measurements of zooplankton," Appl. Opt. 44, 5504-5511 (2005)

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Abstract

Airborne lidar has the potential to survey large areas quickly and at a low cost per kilometer along a survey line. For this reason, we investigated the performance of an airborne lidar for surveys of zooplankton. In particular, we compared the lidar returns with echo-sounder measurements of zooplankton in Prince William Sound, Alaska. Data from eight regions of the Sound were compared, and the correlation between the two methods was 0.78. To obtain this level of agreement, a threshold was applied to the lidar return to remove the effects of scattering from phytoplankton.

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Distribution	Small Copepods	Large Copepods	Larvacea	Euphausids	Other
Numerical	87.0%	3.2%	3.2%	1.6%	5.0%
	25,960 m⁻²	955 m⁻²	955 m⁻²	478 m⁻²	1490 m⁻²
Biomass	51.1%	35.7%	3.5%	6.5%	3.1%
	10.4 g m⁻²	7.3 g m⁻²	0.7 g m⁻²	1.3 g m⁻²	0.6 g m⁻²

Region	Echo Sounder	Lidar
Hinchinbrook Entrance	8.54 × 10⁻⁷	2.60 × 10⁻⁷
Central main basin	5.92 × 10⁻⁷	3.33 × 10⁻⁷
North main basin	6.92 × 10⁻⁷	2.99 × 10⁻⁷
Naked Island	1.94 × 10⁻⁷	1.69 × 10⁻⁷
Perry Pass	3.00 × 10⁻⁷	2.34 × 10⁻⁸
North Knight Island Passage	4.97 × 10⁻⁸	1.27 × 10⁻⁸
South Knight Island Passage	2.31 × 10⁻⁸	4.27 × 10⁻⁸
Montague Strait	1.26 × 10⁻⁸	1.53 × 10⁻⁷

Distribution	Small Copepods	Large Copepods	Larvacea	Euphausids	Other
Numerical	87.0%	3.2%	3.2%	1.6%	5.0%
	25,960 m⁻²	955 m⁻²	955 m⁻²	478 m⁻²	1490 m⁻²
Biomass	51.1%	35.7%	3.5%	6.5%	3.1%
	10.4 g m⁻²	7.3 g m⁻²	0.7 g m⁻²	1.3 g m⁻²	0.6 g m⁻²

Region	Echo Sounder	Lidar
Hinchinbrook Entrance	8.54 × 10⁻⁷	2.60 × 10⁻⁷
Central main basin	5.92 × 10⁻⁷	3.33 × 10⁻⁷
North main basin	6.92 × 10⁻⁷	2.99 × 10⁻⁷
Naked Island	1.94 × 10⁻⁷	1.69 × 10⁻⁷
Perry Pass	3.00 × 10⁻⁷	2.34 × 10⁻⁸
North Knight Island Passage	4.97 × 10⁻⁸	1.27 × 10⁻⁸
South Knight Island Passage	2.31 × 10⁻⁸	4.27 × 10⁻⁸
Montague Strait	1.26 × 10⁻⁸	1.53 × 10⁻⁷

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Applied Optics