Bahrain
a 7-bands 9318*8807 pixels WorldView 2 image Dec 10th 2010,


ground resolution 2 m
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see also HICO at Bahrain
work done February 7th 2011 and March 3rd 2011
That was my first WV2 image. A hard case at that!

I had to chase some loopholes in 4SM
It's in the box now.


 
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
 
 



 Turbid waters pour away and around from the resort area where dredging is rife.

Processing this image using 4SM means
 we assume the end-user knowingly accepts the risks.

The data
Calibration and results



The data

The full coverage of the WV2 image
The polygon delineates the area processed

Fasht-al-Jarim appears at the NW corner of this image


 


Dredging is rife there
 

Dredging is rife there

TCC raw linear enhancement
  • I used high towers' shadow over fairly deep waters in order to help estimate path radiances La

SeaTruth by FUGRO, date unknown
The WV2 image is dated Dec 12th 2010






TCC zoom

FCC histeq enhancement



FCC zoom