Requirement of minimal signal‐to‐noise ratios of ocean color sensors and uncertainties of ocean color products

Journal of Geophysical Research: Oceans - Tập 122 Số 3 - Trang 2595-2611 - 2017
Lin Qi1, Zhongping Lee2, Chuanmin Hu3, Menghua Wang4
1State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen, China
2School for the Environment, University of Massachusetts Boston, Boston, Massachusetts, USA
3College of Marine Science, University of South Florida, St. Petersburg, Florida, USA
4National Oceanic and Atmospheric Administrations, Center for Satellite Applications and Research, College Park, Maryland, USA

Tóm tắt

AbstractUsing simulations, error propagation theory, and measurements from the Moderate Resolution Imaging Spectroradiometer (MODIS), we determined the minimal signal‐to‐noise ratio (SNR) required for ocean color measurements and product uncertainties at different spatial and temporal scales. First, based on typical top‐of‐atmosphere (TOA) radiance over the ocean, we evaluate the uncertainties in satellite‐derived Rrs in the visible wavelengths (ΔRrs(vis)) due to sensor noise in both the near‐infrared (NIR) and the visible bands. While the former induces noise in Rrs(vis) through atmospheric correction, the latter has a direct impact on Rrs(vis). Such estimated uncertainties are compared with inherent ΔRrs(vis) uncertainties from in situ measurements and from the operational atmosphere correction algorithm. The comparison leads to a conclusion that once SNR(NIR) is above 600:1, an SNR(vis) better than 400:1 will not make a significant reduction in product uncertainties at pixel level under typical conditions for a solar zenith angle of 45°. Then, such uncertainties are found to decrease significantly in data products of oceanic waters when the 1 km pixels from individual images are binned to lower spatial resolution (e.g., 4 km) or temporal resolution (e.g., monthly). Although these findings do not suggest that passive ocean color sensors should have SNR(vis) around 400:1, they do support the argument for more trade space in higher spatial and/or spectral resolutions once this minimal 400:1 SNR(vis) requirement is met.

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Tài liệu tham khảo

10.1029/2004JC002620

10.1029/2007JC004472

10.1016/j.rse.2006.01.015

10.1109/TGRS.2014.2348713

10.1016/j.rse.2013.09.020

10.1126/science.1055071

10.2112/JCOASTRES-D-12-00223.1

10.1016/S0034-4257(02)00108-6

10.1109/TGRS.2015.2483500

10.1364/AO.29.003228

10.1029/96JD02443

10.1364/AO.33.000443

10.1016/j.rse.2003.12.012

10.1029/2004GL021808

Hooker S. B. W. E.Esaias G. C.Feldman W. W.Gregg andC. R.McClain(1992) An overview of SeaWiFS and ocean color inNASA Tech. Memo. vol.104566 Natl. Aeronaut. and Space Admin. Goddard Space Flight Cent. Greenbelt Md.

10.1029/2008GL036119

10.1364/AO.51.006045

10.1029/2011JC007395

10.1007/s12601-012-0028-0

10.1016/j.rse.2013.02.012

10.1016/j.rse.2015.05.022

IOCCG(2010) Atmospheric correction for remotely‐sensed ocean‐colour products inReports of International Ocean‐Color Coordinating Group edited by M. Wang No. 10 Dartmouth Canada.

IOCCG(2012) Mission requirements for future ocean‐colour sensors inReports of the International Ocean‐Colour Coordinating Group edited by C. R. McClain and G. Meister No. 13 Dartmouth Canada.

10.1364/AO.52.001693

10.1364/AO.53.003301

10.1364/AO.50.001501

10.1016/j.rse.2010.04.002

10.1016/j.rse.2006.07.008

10.1146/annurev.marine.010908.163650

10.1016/j.dsr2.2003.11.001

10.1016/j.rse.2007.02.026

10.1016/j.rse.2014.11.025

10.1017/CBO9780511840609

10.1029/98JC02160

10.1016/j.rse.2014.08.001

10.1016/j.rse.2008.02.007

10.1364/AO.46.001535

10.1016/j.rse.2016.04.019

10.1364/OE.15.015722

10.1016/j.rse.2016.05.001

10.1016/j.rse.2008.11.005

Wang M. H. R.Gordon andS.Maritorena(2012) Ocean science requirements supplement: Parameter ranges regrieval sensitivities to noise and signal‐to‐noise requirements for hyperspectral (5 nm) bands (sections A.2 and A.3) inAppendix A of the PACE Mission Science Definition Team Report by Carlos et al. NASA Goddard Space Flight Cent. Greenbelt Md.

10.1029/2006GL025778

10.1016/j.rse.2009.07.013

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Thông tin xuất bản

Journal of Geophysical Research: Oceans

Tập 122 Số 3

2595-2611

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