Optical calibration, bathymetry, water column correction and bottom typing of shallow marine areas, using passive remote sensing imageries
Bathymetry and water column correction
LANDSAT 8 OLIP 
at Caicos Bank, Bahamas
4018*4149, 30 m pixel size, UTM zone 18, downloaded from USGS

 
Panchromatic band
Using the Panchromatic band for water column correction to derive water depth and spectral bottom signature:

Landsat 8 OLIP bandset used for this work
Coastal_1, Blue_2, Green_3, PAN_4, Red_5, NIR_6 and SWIR1_7

Please refer to Bora Bora and Sanaa
for use of the PANchromatic band for water column correction
 
 

  scene LC80090452016110LGN00
May 21rst  2016
work done september 2016

home

This is spring time in the Bahamas

 



DTM seatruth RMSE=0.64 m
        ZDTM+0.8m - Z4SM
 		      ZDTM+0.8m - Z4SM
see legend
 
 		 <==This histogram is a good way 
to estimate a tide height,
rather than the regression






Data and Deglinting

TOA TCC: raw image
BOA TCC deglinted image


Calibration
16U data are scaled to allow for comfortable screen display

Calibration diagram for the whole scene
for bands Coastal, Green, Red and NIR
KBLUE/KGREEN=0.56 => Jerlov water type OIB+0.58
 
Calibration diagram for the whole scene
for bands Blue, PAN, Red, NIR
 




Ready for modeling

BOA TCC: water column corrected
 
Retrieved depth
see legend
 



Bottom typing

SAM classified image
see legend for SAM
Average bottom brightness
notice several super_brightness spots

 



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