HICO at Key Largo, Florida

work done in april 2015

return to HICO

refer to other 4SM work using ETM, ALI and Hyperion over Florida Keys

Please refer to "Bathymetry of shallow coastal regions derived from space-borne hyperspectral sensor" Lee et al, 2006    a449228.pdf
Please refer to "11_Ocean_Products_Using_a_Look-Up-Table_Approach_22FEB11_Bowles.pdf"
This is a complete failure
  • atmosphere is extremely complex, deglinting does a poor job
  • water optical properties are most variable over the scene
  • polarization of HICO radiances might come into play


The data
TCC deglinted
Note the areas of confined waters
TCC deglinted
logarithmic enhancement
"deglinting" does a poor job!

FCC deglinted
logarithmic enhancement
PAN deglinted
logarithmic enhancement

Deglinting along Profile White
based on the cloudy area

Deglinting along Profile White
for NIR, Red, Green and Blue bands

Note: poor deglinting :
the atmosphere is far from homogeneous
Bowles et al signal
polarization of HICO radiances

Estimation of deep water radiances
is most uncertain:

see the deglinted red band

Location od Profile White

Optical calibration for the whole image
all parameters under good control
they depict properties of the clearest waters in the entire image

Calibration diagram
for the entire image
for bands
NIR_28, Red_22, Green_13 and Blue_7

Calibration diagram
for the entire image
for bands
PAN_27, 20, 10 and Blue_7

Profile Red

Profile Red
shows retrieved depth
and water column corrected radiance
Profile Red location

Retrieved depth
  • modeling uses the "PAN solution" for all pixels
  • no smoothing applied, thanks to good signal/noise
  • deglinting based on NIR band does not achieve correct "cleaning" of the atmosphere of this scene
  • water optical properties are most variable in this scene, under the influence of the Everglades, and of human activities
At this stage, it would appear that LUT does no better
than 4SM for this very complex scene

from Bowles et al, feb 22nd 2011
HICO-4SM output
4SM retrieved depth


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