CoastColour Round Robin datasets: a database to evaluate the performance of algorithms for the retrieval of water quality parameters in coastal waters.

Nechad, B; Ruddick, KG; Schroeder, T; Oubelkheir, K; Blondeau-Patissier, D; Cherukuru, RCN; Brando, VE; Dekker, AG; Clementson, LA; Banks, AC; Maritorena, S; Werdell, J; Sa, C; Brotas, V; Caballero de Frutos, I; Ahn, Y-H; Salama, S; Tilstone, GH; Martinez-Vicente, V; Foley, D; McKibben, M; Nahorniak, J; Peterson, T; Silio-Calzada, A; Röttgers, R; Lee, ZP; Peters, M; Brockmann, C. 2015 CoastColour Round Robin datasets: a database to evaluate the performance of algorithms for the retrieval of water quality parameters in coastal waters.. Earth System Science Data, 7. 319-348. 10.5194/essd-7-319-2015

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Official URL: http://www.earth-syst-sci-data.net/7/319/2015/

Abstract/Summary

The use of in situ measurements is essential in the validation and evaluation of the algorithms that provide coastal water quality data products from ocean colour satellite remote sensing. Over the past decade, various types of ocean colour algorithms have been developed to deal with the optical complexity of coastal waters. Yet there is a lack of a comprehensive intercomparison due to the availability of quality checked in situ databases. The CoastColour Round Robin (CCRR) project, funded by the European Space Agency (ESA), was designed to bring together three reference data sets using these to test algorithms and to assess their accuracy for retrieving water quality parameters. This paper provides a detailed description of these reference data sets, which include the Medium Resolution Imaging Spectrometer (MERIS) level 2 match-ups, in situ reflectance measurements, and synthetic data generated by a radiative transfer model (HydroLight). These data sets, representing mainly coastal waters, are available from doi:10.1594/PANGAEA.841950. The data sets mainly consist of 6484 marine reflectance (either multispectral or hyperspectral) associated with various geometrical (sensor viewing and solar angles) and sky conditions and water constituents: total suspended matter (TSM) and chlorophyll a (CHL) concentrations, and the absorption of coloured dissolved organic matter (CDOM). Inherent optical properties are also provided in the simulated data sets (5000 simulations) and from 3054 match-up locations. The distributions of reflectance at selected MERIS bands and band ratios, CHL and TSM as a function of reflectance, from the three data sets are compared. Match-up and in situ sites where deviations occur are identified. The distributions of the three reflectance data sets are also compared to the simulated and in situ reflectances used previously by the International Ocean Colour Coordinating Group (IOCCG, 2006) for algorithm testing, showing a clear extension of the CCRR data which covers more turbid waters.

Item Type: Publication - Article
Subjects: Biology
Earth Observation - Remote Sensing
Oceanography
Technology
Divisions: Plymouth Marine Laboratory > Science Areas > Earth Observation Science and Applications
Depositing User: Gavin Tilstone
Date made live: 28 Jan 2016 09:39
Last Modified: 06 Jun 2017 16:14
URI: http://plymsea.ac.uk/id/eprint/6717

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