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

Bathymetry and water column corection
A 1500*2100 series of Landsat ETM/TM  4-bands images 

of Ras Hatibah, Saudi Arabia

work done in march 2010

 
 
 

.
 .
RasHatibahCZ07
the above results raised
quite some alarming comments
 (March 25th 2010)
RasHatibahCZ07
the above results raised
quite some alarming comments
 (March 25th 2010)


rashatibahCZ07.pix: Channel 16

What changes I have made
(March 27th 2010)
  • seen that all 3 images with gaps create all sorts of problems: ETM_2007-12-23  ETM_2008-10-22 ETM_2009-10-09
  • seen that ETM_1999-11-15 creates all sorts of problems
  • came up with a select few seven images for rashatibahCZ07
    • 01 ETM_1999-07-10.pix
    • 02 ETM_1999-11-15.pix.bz2 is out
    • 03 ETM_2000-11-01.pix
    • 04 ETM_2001-11-04.pix
    • 05 ETM_2002-06-16.pix
    • 06 ETM_2002-08-19.pix
    • 07 ETM_2003-01-10.pix
    • 08 ETM_2007-12-23.pix.bz2 is out
    • 09 ETM_2008-10-22.pix.bz2 is out
    • 10 ETM_2009-10-09.pix.bz2 is out
    • 11 TM_1990-11-06.pix
  • imposed a more stringent Lm condition on ETM_2003-01-10:
  • all 11 images    were processed with -Lm/0001.0/001.0/10.0p/255.0, a rather bold statement!
  • now ETM_2003-01-10 is processed with -Lm/0001.0/002.5/10.0p/255.0, a much more conservative statement!
  • taken a closer look at my ZCombiner tool: see that the land mask is now more acceptable!
  • Well, I suppose I needed the time, and some interaction on your part.


rashatibahCZ07.pix: Channel 15

Standard deviation 
on final averaged depth 
in decimeters

rashatibahCZ07.pix: Channel 14

N on final averaged depth


rashatibahCZ07.pix: Channel 13

Deepest depth over 11 images
in decimeters


rashatibahCZ07.pix: Channel 12

Shows which image is deepest

2 - blue for ETM_1999-11-15
11 - purple for TM_1990-11-06
...

 

from Lm[green]=1.0 
to Lm[green]=2.5
on ETM_1999-11-15

from Lm[green]=1.0 
to Lm[green]=2.5
on ETM_1999-11-15
Very dark bottom brightness at depth is unlikely.
  This seems to be an artifact,
particularly so when looking at Admiralty Chart.
(the closer to the waterline, the less clear the waters)
This way, deep channels are cleared out

==> All 11 images are now processed
with Lm[green]=2.5 or even higher
 



 




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