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Objectives To develop and calibrate an algorithm to give SPM maps for the Belgian coastal waters. - PowerPoint PPT Presentation


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SeaWiFS MERIS MODIS. SPM (mg/l). Reflectance. Suspended Particulate Matter (SPM) mapping from MERIS imagery Calibration of a regional algorithm for the Belgian Coastal waters B. Nechad, V. Decauwer, Y. Park and K.G. Ruddick* b.nechad@mumm.ac.be. http://www.mumm.ac.be. Objectives

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Presentation Transcript
slide1

SeaWiFS MERIS MODIS

SPM (mg/l)

Reflectance

Suspended Particulate Matter (SPM) mapping from MERIS imagery

Calibration of a regional algorithm for the Belgian Coastal waters

B. Nechad, V. Decauwer, Y. Park and K.G. Ruddick*

b.nechad@mumm.ac.be

http://www.mumm.ac.be

Objectives

To develop and calibrate an algorithm to give SPM maps for the Belgian coastal waters.

Data & Methods

◘ During 17 campaigns carried out in the Belgian waters between 2001 and 2003, 68 datasets were acquired for SPM at 3m depth (GF/C filter) and surface reflectance using Trios radiometer with a spectral resolution of 0.25nm.

◘ MERIS reflectance defined by:

is related to the IOPs by (Gordon et al 1976):

where is

linked to the SPM ( ) by:

◘ Non linear regression analysis are applied to the set of 68 datasets using the regression equation:

The model parameters and are accounting for the coefficient and the errors in the model and the measurements

the logarithmic transform of the dependent variable, to stabilise its variance (as is Gaussian)

Upwelling radiance and

Downwelling irradiance reflectance

just above the water surface

Non Linear Regression Results

Model graphs, scatterplot of measurements

the specific backscatter

slide2

AQUA

TERRA

SeaWiFS

MERIS

Trios

M/AQUA

M/TERRA

Model performance

SeaWiFS MERIS MODIS

SPM in mg/l derived from MERIS image taken on June, 16th 2003 at 12:25 UTC

SPM in mg/l derived from 2 SeaWiFS

images taken on June, 16th 2003 at

11:47:30 UTC and 13:25:05 UTC

SPM in mg/l derived from 2 MODIS images taken on June, 16th 2003 at

12:25 UTC and 10:45UTC

Wavelengths (nm)

Reflectance spectra measured by the 4 sensors at station MC16A, on the 16th June 2003

slide3

SPM (mg/l) at 0.5m, pre-ashed, GF/F

SPM (mg/l) at 3m, GF/C filter

  • Preliminary validation

Scatterplot of 6 matchup MERIS SPM data vs in situ SPM data, the correlation of these with MERIS product is negative (C=-46,47%), while it is C=79,46% for the MUMM product.

  • Conclusions

◘ The Red and Near IR bands avoid the signature of CDOM and yellow substance absorption. The main IOPs arise from water absorption and SPM scattering.

◘ SPM is almost linearly related to reflectance.

  • Perspectives

◘ More SPM data to be collected and used in the validation.

◘ An application of this study is the production of depth-average SPM to provide the SPM Transport Model with boundary conditions.

The Belgian Office for Scientific, Technical  and Cultural affairs (OSTC), the receiving station of Dundee University, Orbimage, the SeaWiFS and SeaDAS project teams, the Distributed Active Archive Center at GSFC, ESA and its subcontractors and the MODIS team are acknowledged for providing, distributing and supporting satellite images.