caicos-etm-009-045-1999-09-20
        



 
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
 



Final calibration diagram
 
  • Results along the above black profiles are used as "seatruth" for all the following images

  • cWL are tuned so as to obtain the best visual fit

    • profile_black_profileZZ
    • profile_black_regressZZ

  • K[nir]~=4.5 m-1

  • -cWL/0.500/0.580/0.100/0.500

  • -dLsw0000/01.0/0000/0000

  • RLBbg=1.17




PlotZ23
RLBbg=1.00

PlotZ23
RLBbg=1.17