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Remote Sens. 2015, 7(2), 2193-2207;

Inter-Comparison between VIIRS and MODIS Radiances and Ocean Color Data Products over the Chesapeake Bay

Naval Research Laboratory, Code 7231, Washington, DC 20375, USA
Naval Research Laboratory, Code 7331, Stennis Space Center, MS 39529, USA
Author to whom correspondence should be addressed.
Academic Editors: Xiao-Hai Yan and Prasad S. Thenkabail
Received: 21 November 2014 / Revised: 6 January 2015 / Accepted: 10 February 2015 / Published: 17 February 2015
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Since the October 2011 launch of the VIIRS (Visible Infrared Imaging Radiometer Suite) instrument, a number of inter-sensor comparisons between VIIRS and MODIS (Moderate Resolution Imaging Spectroradiometer) radiances have been reported. Most of these comparisons are between calibrated radiances and temperatures based on observations of the two sensors from simultaneous nadir overpasses (SNO). Few comparisons between the retrieved ocean color data products, such as chlorophyll concentration, from VIIRS and MODIS data have been reported. Retrievals from measured data at large solar zenith angles and large view zenith angles are excluded from these comparison studies. In this paper, we report the inter-sensor comparisons between VIIRS and MODIS data acquired over the Chesapeake Bay and nearby areas with relatively large differences in sensor view angles. The goal for this study is to check the consistency between MODIS and VIIRS ocean color data products in order to merge the products from the two sensors. We compare total radiances (Lt) at the top of atmosphere (TOA) and the ocean color (OC) data products derived with the automatic processing system (APS) from both VIIRS and MODIS data. APS was developed at the Naval Research Laboratory, Stennis Space Center (NRL/SSC). We have found that, although there are large differences between the measured radiances (Lt) of the two sensors when the sensor zenith angle differences are significant, the mean percent differences between the retrieved normalized water-leaving radiances are about 15%. The results show that the variation in satellite view zenith angles is not a main factor affecting the retrieval of ocean color data products, i.e., the atmospheric correction routine adequately removes the view-angle dependence. View Full-Text
Keywords: MODIS; VIIRS; remote sensing; water-leaving radiance MODIS; VIIRS; remote sensing; water-leaving radiance

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, R.-R.; Lewis, M.D.; Gould, R.W., Jr.; Lawson, A.; Amin, R.; Gallegos, S.C.; Ladner, S. Inter-Comparison between VIIRS and MODIS Radiances and Ocean Color Data Products over the Chesapeake Bay. Remote Sens. 2015, 7, 2193-2207.

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