Comment on “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems”

Giuseppe Zibordi

doi:10.1364/AO.51.003888

Applied Optics
Vol. 51,
Issue 17,
pp. 3888-3892
(2012)
•https://doi.org/10.1364/AO.51.003888

Comment on “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems”

Giuseppe Zibordi

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Giuseppe Zibordi, "Comment on “Long Island Sound Coastal Observatory: assessment of above-water radiometric measurement uncertainties using collocated multi and hyperspectral systems”," Appl. Opt. 51, 3888-3892 (2012)

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- Atmospheric and Oceanic Optics
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About this Article
History
- Original Manuscript: November 29, 2011
- Manuscript Accepted: March 4, 2012
- Published: June 8, 2012
Virtual Issues
Virtual Journal for Biomedical Optics Vol. 7, Iss. 8

Abstract

Harmel et al. [Appl. Opt. 50, 5842 (2011) [CrossRef] ] presented an intercomparison of products from collocated above-water radiometric measurements performed with a Hyperspectral Surface Acquisition System (HyperSAS) and a multispectral Sea-viewing Wide Field of View Sensor Photometer Revision for Incident Surface Measurements (SeaPRISM). Radiometric products from HyperSAS data were determined with a processing code written by the authors, while products from SeaPRISM measurements were obtained with the standard processor of the Ocean Color component of the Aerosol Robotic Network (AERONET-OC). Despite the application of equivalent processing schemes, results exhibit spectrally averaged unbiased relative differences of $+ 26 %$ between HyperSAS and SeaPRISM exact normalized water leaving radiances, $L_{WN}$ . Harmel et al. concluded that the sun-glint correction scheme applied for SeaPRISM data reduction is a major reason for the observed differences. This comment rejects the former conclusion as being supported by a wrong interpretation of the AERONET-OC processing scheme, and a consequent failure in describing the spectral properties of the glint radiance determined from SeaPRISM data. Afterward, the differences between HyperSAS and SeaPRISM $L_{WN}$ reported by Harmel et al. are challenged with intercomparison results from collocated measurements periodically performed over almost a decade with an in-water multispectral system and SeaPRISM. Results for $L_{WN}$ from the in-water system show spectrally averaged unbiased relative differences of $+ 1 %$ with respect to SeaPRISM values.

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	SeaPRISM		WiSPER		Combined
Spectral Region	412–555 nm	670 nm	412–555 nm	670 nm	412–555 nm	670 nm
$L_{W}$ [%]	4a	7a	4b	5b	6	9
$E_{S}$ [%]	2c	2c	3d	3d	4	4
$L_{WN}$ [%]	5e	8e	5f	6f	7	10

Quantity	Average std
$L_{WN} (555)$ [ $mW {cm}^{- 2} {μm}^{- 1} {sr}^{- 1}$ ]	$1.2 \pm 0.5$
$θ_{0}$ [degrees]	$38 \pm 13$
$Chl a$ [ $μg 1^{- 1}$ ]	$1.1 \pm 0.7$
$τ_{a} (555)$ [—]	$0.22 \pm 0.12$

	$λ$	412	443	490	555	670	412–670b
$L_{W}$	rmsd	0.04	0.04	0.06	0.04	0.01	0.04
	$\| ψ_{u} \|$	7	6	6	5	14	8
	$ψ_{u}$	$+ 0$	$- 1$	$- 2$	$- 2$	$+ 3$	0
	$r^{2}$	0.93	0.95	0.96	0.98	0.95	0.98
$E_{S}$	rmsd	0.06	0.04	0.03	0.09	0.04	0.06
	$\| ψ_{u} \|$	5	3	2	7	4	4
	$ψ_{u}$	$+ 5$	$+ 1$	$+ 1$	$- 7$	$- 4$	$- 1$
	$r^{2}$	0.98	0.98	0.98	0.98	0.98	0.95
$L_{WN}$	rmsd	0.08	0.07	0.11	0.08	0.02	0.08
	$\| ψ_{u} \|$	9	6	7	6	15	8
	$ψ_{u}$	$- 6$	$+ 1$	$+ 2$	$+ 2$	$+ 5$	$+ 1$
	$r^{2}$	0.92	0.96	0.96	0.98	0.94	0.98

	SeaPRISM		WiSPER		Combined
Spectral Region	412–555 nm	670 nm	412–555 nm	670 nm	412–555 nm	670 nm
$L_{W}$ [%]	4a	7a	4b	5b	6	9
$E_{S}$ [%]	2c	2c	3d	3d	4	4
$L_{WN}$ [%]	5e	8e	5f	6f	7	10

Quantity	Average std
$L_{WN} (555)$ [ $mW {cm}^{- 2} {μm}^{- 1} {sr}^{- 1}$ ]	$1.2 \pm 0.5$
$θ_{0}$ [degrees]	$38 \pm 13$
$Chl a$ [ $μg 1^{- 1}$ ]	$1.1 \pm 0.7$
$τ_{a} (555)$ [—]	$0.22 \pm 0.12$

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Applied Optics