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MATCHUP ANALYSES: RESULTS

The results below are not to be considered as definitive. They will evolve as we progressively incorporate more satellite data and more in situ data into the analysis.

 

More recent results here

 

MERIS: Water-leaving reflectances

 

MERIS matchups (in terms of rw) at the BOUSSOLE site, including the following wavelengths : 412, 443, 490, 510, 560, 670, 683 nm. The same data are plotted with a linear scale on the left and a log scale on the right, in order to highlight the low reflectance values of the red wavelengths. The solid line is the 1:1 line. The dotted line is a simple linear fit on the data. The slope and intercept of this curve are also indicated.

 

Matchup statistics for MERIS, per wavelengths and for all wavelengths put together.

MERIS: Chlorophyll concentration

To be completed later..

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SeaWiFS: Water-leaving radiances

The figure below shows the 37 matchup points obtained for the SeaWiFS sensor, showing an overall good agreement (average UPD is approximately 5%), yet confirming as well that the results for the 412nm band are outside of acceptable limits.

SeaWiFS matchups (in terms of nLw) at the BOUSSOLE site, including the following wavelengths : 412, 443, 490, 510, 555 and 670 nm. The same data are plotted with a linear scale on the left and a log scale on the right, in order to highlight the low water-leaving radiance values of the red wavelengths. The solid line is the 1:1 line. The dotted line is a simple linear fit on the data. The slope and intercept of this curve are also indicated. The number of points is 87 (40 at 412 nm).

 

Matchup statistics for SeaWiFS, per wavelengths and for all wavelengths put together.

SeaWiFS: Chlorophyll concentration

- to be completed later

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Aqua-MODIS: Water-leaving radiances

 

Aqua-MODIS matchups (in terms of nLw) at the BOUSSOLE site, including the following wavelengths : 412, 443, 488, 510, 551, 670 and 683 nm. The same data are plotted with a linear scale on the left and a log scale on the right, in order to highlight the low water-leaving radiance values of the red wavelengths. The solid line is the 1:1 line. The dotted line is a simple linear fit on the data. The slope and intercept of this curve are also indicated. The number of points is 85 (42 at 412 nm).

 

Matchup statistics for Aqua MODIS, per wavelengths and for all wavelengths put together.

Aqua-MODIS: Chlorophyll concentration

To be completed later

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Summary of chlorophyll matchups (MERIS, SeaWiFS, Aqua-MODIS)

 

Chlorophyll matchups at BOUSSOLE for MERIS (left; N = 17), SeaWiFS (middle; N = 22) and Aqua-MODIS (right; N = 24). Data from July 2001 to the end of 2003. The horizontal error bar, for the in situ HPLC-chlorophyll, is simply a +/-30% error bar, while the vertical error bar, for the satellite-derived chlorophyll, corresponds to one standard deviation within the 3x3 pixel box from which the mean value was computed.

 

As above, but when the quality control applied to the radiometry matchups is used for the chlorophyll matchups.

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