Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passive remote sensing imageries
CASI image of Bay of Agay, French Riviera

Please refer to Jaubert et al. Marine Ecology Progress Series, Vol 263: 75-82, 2003

Image courtesy of HDI , collected october 2000.
This is a 12 bands image, 1455*2916, pixel resolution 1 meter.
The 4SM licensekey is rated at 714 Euros for this image.

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Work done in 2004


 
1 - NO NEED for field data, nor for atmospheric correction
2 - this is demonstrated in this website, using a variety of hyper/multi spectral data
 
Requirements are
1 - homogeneous water body and atmosphere
2 - some coverage of optically deep water
3 - some coverage of dry land
 
Problems are
1 - the precision on estimated depth is found wanting, because the noise-equivalent change in radiance  of accessible data is too high for shallow water column correction work 
2 - radiance data should be preprocessed by the provider at level 1 in order to improve S/N ratio
3 - exponential decay: the deeper/darker the bottom, the poorer the performances
 
So
I keep digging
until suitable data
become available
 
 

This improved mosaic was submitted by Audrey Minghelli-Roman.
Still some puzzling aspects in this processing, november 2004.
-WL467/508/523/535/544/554/565/574/585/595/644/845 in nanometers

Unfortunately, this dataset lacks bands in the red and green regions of the solar spectrum.
This does not help for an optimal deglinting, and also for calibrating/modeling!              

Mosaic and results             Depth and spectral LBS        Normalized spectral LBS

Calibration                         Glint correlation                        Three targets