Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passive remote sensing imageries

CASI image of Bay of Cap Martin, French Riviera
Work done in 2005

Please refer toPlease 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, 4248*3358, pixel resolution 1 meter.

-WL00467/0508/0523/0535/0544/0554/0565/0574/0585/595/644/845 in nanometers
Unfortunately, this dataset lacks bands in the red and green region of the solar spectrum.
This does not help for an optimal deglinting, and also for calibrating/modeling!

return to 4SM Study Cases

 




 
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
 


RGB color composite, raw data

 


RGB color composite, deglinted data

 

Color composite of
normalized spectral bottom reflectance

 

The bright green fringe along the rocky coast
is identified by Jaubert et al.
a a bed of Caulerpa taxifolia seaweed.

 Image_Z250


Image_B