Landsat 8 OLIP at Shuwayhat Island, UAE
from Qatar towards Abu Dhabi
images courtesy of USGS
6747*6082, pixel size=30 m
work done in october 2014
Waters not so clear: watch these Youtube video  and Youtube video
see also the Marawaah island studycase

listen to George FM in New Zealand
 
 
shuwayhat_20131207
shuwayhat_20140329
shuwayhat_20140820
shuwayhat_20140905
shuwayhat_20140921

Four results
Error on retrieved depth


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shuwayhat_20131207
heavy rains over Qatar on november 21rst, bad flooding
scattered ponds of water on land in the image
several occurrences of turbid flows swirling around

This image is not worthy of shallow water work

FCC
Grey: Shuwayhat Island AOI
Orange: coastal turbid waters flowing south

TCC deglinted




shuwayhat_20140329

FCC
 

TCC deglinted

Retrieved depth by PAN solution
Thresholds LmPAN=0.5
 
 

Retrieved depth by GREEN solution
Thresholds LmGREEN=0.5

 
ZGREEN-ZPAN
The ZGREEN-ZPAN image to the right shows the mismatch of the PAN and GREEN solutions.
Red tones....ZGREEN deeper than ZPAN
Blue tone....ZGREEN shallower than ZPAN
ZGREEN-ZPAN

ZGREEN-ZPAN

Profile_black is shown
from section A to section H, clockwise
Profile Black
RED=PAN_solution
BLACK=GREEN_solution
along Profile Black
  • Smart_Smoothing is enabled
  • Discrepancies are regionalised
  • They appear to be caused by variations of water column corrected bottom reflectance signature
    • more than by system noise
  • We can assume that the PAN solution is more accurate than the GREEN solution
Profile Black

Z4=PAN solution
Z3=GREEN solution
along Profile Black

Local variations of water optical properties
probably cause some of the above scatter

see location of profile_black

Retrieved depth ZPAN
 

BGR color composite
of TOA water column corrected radiances
for Coastal, Blue and Green bands



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