Title: Impact of spectral resolution of in situ ocean color radiometric data in satellite matchups analyses
Citation: OPTICS EXPRESS vol. 25 no. 16 p. A798-A812
Publication Year: 2017
JRC N°: JRC105346
ISSN: 1094-4087
URI: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-25-16-A798
DOI: 10.1364/OE.25.00A798
Type: Articles in periodicals and books
Abstract: The spectral resolution requirements for in situ remote sensing reflectance Rrs measurements aiming at supporting satellite ocean color validation and System Vicarious Calibration (SVC) were investigated. The study, conducted using sample hyperspectral Rrs from different water types, focused on the visible spectral bands of the Ocean Land Color Imager (OLCI) and of the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) satellite sensors. Allowing for a ±0.5% maximum difference between in situ and satellite derived Rrs solely due to the spectral band characteristics of the in situ radiometer, a spectral resolution of 1 nm for SVC of PACE is needed in oligotrophic waters. Requirements decrease to 3 nm for SVC of OLCI. In the case of validation activities, which exhibit less stringent uncertainty requirements with respect to SVC, a maximum difference of ±1% between in situ and satellite derived data indicates the need for a spectral resolution of 3 nm for both OLCI and PACE in oligotrophic waters. Conversely, spectral resolutions of 6 nm for PACE and 9 nm for OLCI appear to satisfy validation activities in optically complex waters.
JRC Directorate:Sustainable Resources

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