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Landsat 8 at Florida Bay 

scene acquired March 7th 2020, courtesy of USGS
work done march 2021
see NOAA chart 11452

see NOAA chart 11433
see NOAA chart 11451
 
 
The Data: several challenges
  • Florida Bay East tide ~0.4 m; FloridaBay West tide ~0.6 m
  • shallow silty(?) waters of Gulf of Mexico
  • inland fresh waters flowing from Everglades Park over Florida Bay
  • possibly confined waters in isolated Florida Bay marine lakes
  • clear oceanic waters in Straight of Florida?

TCC

FCC

Glint regressions

TCC deglinted, TOA 
 
 
 
Optical calibration over the full image























Full image
calibration Blue, Green, Red and NIR
OII water type of Jerlov in Straits of Florida

 


Full image
calibration Blue, PAN, Red and NIR
Panchromatic band under nice control

 

 
 
Optical calibration  for eight ROIs
  • Gulf waters probably do not achieve bottom detection:
    • possibly silty waters
  • Straits of Florida     exhibits Oceanic OII water type of Jerlov
  • Eastern Florida Bay exhibits Oceanic OII water type of Jerlov?
    • sparse seagrass, very bright bottoms
  • Central Florida Bay is under influence of Everglades Park fresh waters 
    • up to Coastal C7 water type  of Jerlov: see Orange and Turquoise ROIs
    • abundant seagrass beds
 
ROIs
  • The above calibration applies to the clearest waters in the whole image.
  • This is likely to be located along the outer reefs: Straits of Florida.
  • The Florida Bay remarkably harbours a number of confined and very shallow marine "lakes" which possibly host less clear waters, under the influence of the Everglades waters.

 Mask_3 orange ROI 
  • Following the BPL assumption:
    • Kgreen/Kred   =0.733/1.199=0.61
    • Kblue  /Kred   =1.027/1.199=0.86
    • Kblue  /Kgreen=0.86/0.61=1.40
  • This ROI exhibits Coastal C5+0.4 water type
  • This applies down to ~2 m
  • Depths in his ROI do not exceed ~2 m
 
Mask_4 turquoise ROI
 
  • Turquoise ROI exhibits Coastal C7 water type
  • Depths in his ROI do not exceed ~2 m
 
Mask_5 blue ROI
  • It is very clear that Kblue=Kgreen=0.278
  • Blue ROI exhibits Oceanic OIII water type
  • Depths in this ROI do not exceed ~2 m

Mask_6 red ROI
  • It is clear that Kblue=Kgreen=0.278
  •  Red ROI exhibits Oceanic OIII+0.5 water type
  • Depths in his ROI do not exceed~ 2 m

Mask_7 green ROI
  • It is clear that Kblue=Kgreen=0.278
  •  Green ROI exhibits Oceanic OIII+0.5 water type
  • Depths in this ROI do not exceed 1.2 m

Mask_8 white ROI
  • It is very clear that Kblue=Kgreen=0.278
  • Depths in his ROI do not exceed~ 2 m
 

 

Mask_10 purple ROI
  • Kblue/Kred   =0.124/0.823=0.151
  • Kgreen/Kred =0.124/0.823=0.239
  • Kblue/Kgreen=0.151/0.239=0.632
  • Evidence here is unquestionable
  • Purple ROI exhibits Oceanic OII water type
  • Depths in this ROI exceed 25 m

 
 
 
LUT results V3
 
LUT: map of the ratio Kblue/Kgreen

LUT: SDB see legend
 
LUT: Corrected reflectance UGB TCC
UltraBlue, Green, Blue RGB
 
 
 
 
 
 
 
 
 
 



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