4SM on OLI at Caicos Bank, Bahamas

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
Image courtesy of the U.S. Geological Survey

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

Landsat 8 OLIP bandset used for this work
Purple_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 LC80090452015011LGN00, Jan 11th 2015.
work done in july 2016

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DTM seatruth RMSE=0.93 m
PAN solution used

ZDTM+2m-Z4SM I can't explain such a tide correction, as it excedds by large any tide prediction at Caicos Bank (0.8 m max) see legend	Histogram of ZDTM+1.75m and Z4SM tide correction 1.75 m
Z4SM va ZDTM+1.75m	What can cause such over-estimation of retrieved depth? spectral K values appear to be correct I can only suspect the Soil Line model maybe also the PAN model