use a LUT in 4SM to map the diffuse attenuation coefficient Kd
work done in 2021 at 15 m GSD
Using the Panchromatic band for water column correction
to derive water depth and spectral bottom signature:

Landsat 8 OLIP bandset used for this work

Purple=1Blue=2Green=3PAN=4Red=5NIR=6 and SWIR1=7

   peer-reviewed and published in 2017    



image aquired November 6th 2020

work in progress

The data


TCC deglinted BOA

Glint regressions, based on SWIR band 7,

Green band, BOA deglinted

Blue band, BOA deglinted

Optical calibration

Optical calibration confirms LUT mapping results 
Map of the ratio Kblue/Kgreen   see legend

Map of K2/K3 on reef flat:
how surprising

Map of K2/K3 on mangrove/river discharge:
coastal waters as expected


How weird
OIII water type on the reef flat
  • 1-5 m: Kblue~=Kgreen: K2/K3=0.9
  • reef crest covered by 1 m of water
This is demonstrated
and confirms the above LUT mapping result

Quite interesting
Coastal waters along the coast
  • 0-4 m: Kblue>>Kgreen: K2/K3~1.3
    • that is Coastal C5 water type
  • >4 m:  Kblue~=Kgreen: K2/K3~0.9
    • that is Coastal C1 water type

Optical calibration


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