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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* email@example.com. http://www.mumm.ac.be. Objectives
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*
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):
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
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
Reflectance spectra measured by the 4 sensors at station MC16A, on the 16th June 2003
SPM (mg/l) at 3m, GF/C filter
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.
◘ 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.
◘ 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.