Florida EO1 ALI EO1A0150432002299110KY 26 OCT 2002
 
 
 
EO1 ALI EO1A0150432002299110KY 26 OCT 2002

TCC
 Notice the white profile and the green profile
studied by ZhongPing Lee et al

 
toto
FCC
notice streaks of floating vegetation
carried away by turbid waters

 
 
TCC zoom
* plumes of turbid waters pour out from islets area into clear ocean waters and over deeper seated seabed
* "turbid waters" is just to mean that they are distinctly less clear

 

 FCC zoom
* notice streaks of floating vegetation carried away by turbid waters

 

Purple at 443 nm
 
* does not see through the plume
* notice various mixes of waters

 

Blue at 483 nm

* does not see through the plume
* notice various mixes of waters


 

 Green at 565 nm
* gets some bottom detection through the plume

 Red at 660 nm
* is brighter in the plume than over surrounding ocean waters,
* no obvious bottom detection

 

NIR at 790 nm
* is hardly brighter over the plume

 

NIR at 868 nm
* is hardly brighter over the plume
* penetrates a little less than NIR at 790 nm

 

band 1 at 443 nm

band 2 at 482 nm

Deep water radiance
is next to null in blue bands (i.e.~=La)
over Everglades inland waters


 

band 3 at 573 nm

band 4 at 660 nm

Deep water radiance
is ~ the same from Everglades inland waters
to open ocean waters
ALI's four stripes show up: this is a pain!

 

 
 

Red profile runs over 117 kilometers

 

  from the ocean, through the Keys, then to the Everglades
  • A to B in open ocean waters: the Blue bands increase gently: why is that?
  • B is located over the sharp Looe Key reef
  • B to C accross the clear waters of the lagoon
    • the NIR bands show adjacency effect building up
    • the Red band shows just one peak over LooeKey reef and then faint bottom detection in the deeer lagoon
    • the Green and Blue bands show strong bottom detection over the reef and in the deeer lagoon
    • Deglinting removes the adjacency effect
  • C is located at the outer edge of the turbid water plume
  • C to D the profile enters the turbid waters plume and proceeds northwards through several keys and channels
    • note a sudden increase of radiances in NIR to Green bands
    • note that the blue[483] band drops to its deep water radiance value, while the blue[443] drops well below its deep water radiance value, while the green band remains high
    • the turbid plume waters originate from inside this maze of keys
  • D to F the profile now proceeds eastwards then northwards across the bay
    • first over bright bottoms
    • then in a dark-bottomed area where radiances in both blue bands exhibit "negative bottom contrast"
  • F to G out again in the open over bright Florida bay
  • G to H the profile now crosses shallow waters flowing from the Everglades marshes
    • bottoms are bright at the center of this estuary
    • but much darker at both sides
  • H reaches the Everglades marshes

EO1A0150432002299110KY_6_4_3_2
Optical calibration under yellow mask
(yellow mask is the same as for Hyperion image)
for bands NIR=6, Red=4, Green=3 and Blue=2

 
  • K2/K3~=0.39: this is "blue waters" over the outer reef
  • very low K values in the blue range are indicative of very clear "blue water": Sargasso Sea is not far away:
    • Water type is OIB: this is known from the Hyperion image above
  • WL[green] at 573.2 nm
    • in order to obtain Water type is OIB,
    • we have to set WL[green] at 573.24 nm
    • instead of 565 nm at mid-waveband
  • WL[green] not at mid-waveband in Landsat and ALI images:
    • the operational wavelength for the green waveband must be offset at longer wavelength than mid-waveband
    • this is quite an achievement, as it confirms what was observed with most TM, ETM and ALI images
    • possibly just because of the shape of the response curve

Optical calibration under red mask
(red mask is the same as for Hyperion image)
for bands NIR=6, Red=4, Green=3 and Blue=2

 
  • K2/K3~=0.85: this is coastal waters over the Florida bay, under strong influence of waters flowing from the Everglades
  • Water type: OIII (this is the same as Coastal 1)
    • WL[green] at 573 nm : OIII+0.08
    • WL[green] at 565 nm : OIII+0.00 at mid-waveband
    • shifting WL[green] is not required for coastal waters, because K[green] is very close to K[blue]
    • it does not hurt though






 


EO1A0150432002299110KY_4_3_2_1
Optical calibration under yellow mask
for bands Red=4, Green=3 Blue=2 and Blue=1


 

EO1A0150432002299110KY_4_3_2_1
Optical calibration under red mask
for bands Red=4, Green=3 Blue=2 and Blue=1 

 

 
 

Green line South: Looe Key reef side
compare with figure 6 of NRL's paper
compare with Hyperion

Just like Hyperion,
ALI yields ~10 m in the moat
under the calibration by Jerlov's data
at specified Hyperion wavelengths



 

Green line North: Florida bay side
compare with Hyperion
  • Smoothing applied/required to Hyperion data,
  • No smoothing applied/required to ALI data,
    • thanks to excellent SN ratio
    • but ALI has adverse imbalance among its four stripes: this is quite bad for 4SM shallow water modeling
 
 
White line South: Looe Key reef side
compare with figure 6 of NRL's paper
compare with Hyperion

 

 White line North: Florida bay side

compare with Hyperion

 


Yellow line: Looe Key
compare with figure 15 of Densham's thesis
compare with Hyperion



 
 
 
<<== Yellow line at Looe Key
  • Densham's profile is 650 m long
    • runs from ~3 m at Looe Key reef
    • to ~14 m along the outer reef slope
    • shows LIDAR measured depths
  • That's approximately
    • from waypoint B at ~2 m
    • to waypoint C at ~15 m
    • of the profile on the left
  • Note that the "shoulder" at ~10 m is present




 


This brings a nice support
to our 4SM calibration
using Jerlov's data








 
<<== Yellow line at Looe Key
see figure 13 of Densham's thesis
 
Normalized bottom reflectance TCC
 

Average bottom reflectance
 
 
Bottom typing
see bottom type signatures
 Bottom typing
see
bottom type signatures
 
  • We had to offset the ALI image by 90 m in X and 960 m in Y in order co co-register the ALI image with the HYPERION image
  • The calibration of the ALI image uses only the the footprint of the HYPERION image
  • The bottom typing training sites used for the HYPERION image were also used unchanged for the ALI image
 
ALI computed depth Z250
 

HYPERION computed depth Z250 

 
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