CoastColour Round Robin data sets: a database to evaluate the performance of algorithms for the retrieval of water quality parameters in coastal waters
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 com...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-11-01
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| Series: | Earth System Science Data |
| Online Access: | http://www.earth-syst-sci-data.net/7/319/2015/essd-7-319-2015.pdf |
| 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 <a href="http://dx.doi.org/10.1594/PANGAEA.841950">doi:10.1594/PANGAEA.841950</a>.
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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 <i>a</i> (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. |
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| ISSN: | 1866-3508 1866-3516 |