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

Calibration of full TM/ETM imageries


and the winner is

 
 
 

Caicos Bank: 18 ETM scenes

Caicos Bank: 18 ETM scenes


ETM_009_045_1999-09-20 Caicos


cloudy  
  September: K1/K2=0.58 WL[2]=567 nm ==> OIB+0.94
seatruth   Z   LB


ETM_009_045_2001-01-28 caicos

  
January: K1/K2=0.47 WL[2]=568 nm OIB+0.42
seatruth   Z   LB

ETM_009_045_2001-07-07 Caicos

turbid atmosphere, very bright image, lots of clouds
July: K1/K2=0.62 WL[2]=574 nm   ==>   OII+0.24

seatruth     Z     LB

ETM_009_045_2002-02-16


February: K1/K2=0.50 WL[2]=566.6 nm ==> OIB+0.53
seatruth    Z     LB

ETM_009_045_2002-07-10

lots of clouds
July: K1/K2=0.46 WL[2]=567 nm   ==>   OIB+0.36

seatruth     Z     LB
 

ETM_009_045_2003-01-18

lots of clouds
January: K1/K2=0.446 WL[2]=562 nm   ==>   OIB+0.18

seatruth     Z     LB

ETM_009_045_2003-04-24

very nice
January: K1/K2=0.446 WL[2]=562 nm   ==>   OIB+0.18

seatruth     Z     LB

ETM_009_045_2007-02-14

very nice
February: K1/K2=0.540 WL[2]=569 nm   ==>   OIB+0.80

seatruth     Z     LB

ETM_009_045_2007-05-05

very high glint, questionable
May: K1/K2=0.580 WL[2]=567 nm   ==>   OIB+0.95

seatruth     Z     LB

ETM_009_045_2007-12-15

very nice
December: K1/K2=0.550 WL[2]=567.4 nm   ==>   OIB+0.80

seatruth     Z     LB

ETM_009_045_2007-12-31

very nice
December: K1/K2=0.510 WL[2]=571.4 nm   ==>   OIB+0.71

seatruth     Z     LB

ETM_009_045_2008-02-17

difficult, blue sky
February: K1/K2=0.470 WL[2]=573.3 nm   ==>   OIB+0.63

seatruth     Z     LB

ETM_009_045_2008-04-05

difficult, blue sky
April: K1/K2=0.470 WL[2]=571.4 nm   ==>   OIB+0.63

seatruth     Z     LB
 

ETM_009_045_2008-04-21

very nice, blue sky
April: K1/K2=0.470 WL[2]=562.9 nm   ==>   OIB+0.32

seatruth     Z     LB

ETM_009_045_2008-12-17

very cloudy, quite good seatruth
December: K1/K2=0.470 WL[2]=569.0 nm   ==>   OIB+0.45


seatruth     Z     LB

ETM_009_045_2009-01-02

clear image, quite good seatruth
January: K1/K2=0.480 WL[2]=564.9 nm   ==>   OIB+0.40


seatruth     Z     LB

ETM_009_045_2009-01-18

cloudy image, quite good seatruth
January: K1/K2=0.515 WL[2]=569.8 nm   ==>   OIB+0.69


seatruth     Z     LB

TM_009_045_1990-11-22

clear TM image
November: K1/K2=0.50 WL[2]=576.3 nm   ==>   OIB+0.81


seatruth     Z     LB






 

Miscellaneous Landsat images

Miscellaneous Landsat images

Alacranes atoll ETM


  Z     BSC
Chinchorro atoll ETM


 Z     BSC
DaviesReef atoll ETM


  Z     BSC
Heron island ETM


      LB

ETM_013_042_2007-12-27
Great Abaco, Bahamas

quite     nice
 
 


 

And the winner is TM_012_044_1986-02-17

This is Long Island in the Bahamas   TM_012_044_1986-02-17: I seem to have lost the image

  • This provides the most desired proof that 4SM's assumptions are trustworthy.
    • WLgreen is set to 577.3 nm here : cWLgreen~=0.6
    • WLblue and WLred at mid-wavelength are satisfactory
    • Knir at 4.5 m-1 is quite satisfactory, as usual
  • ==>>>>Where it is seen not to be the case, there must be a good reason.
    • maybe WLgreen is not set to an appropriate value
    • and/or the illumination conditions aren't ideal
    • and/or the water body is not as homogeneous as expected
    • and/or the brightest bottom type is not present over the whole depth range
  •  
  • That was in 2009:
    Thanks to hyperspectral evidence in 2015,

    I now think otherwise 



 




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