Bathymetry and water column correction
LANDSAT 8 OLIP 
at Mulroy Bay, Ireland
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=1Blue=2Green=3PAN=4Red=5NIR=6 and SWIR1=7

Work done july 2018
GSD 15 m
 
 
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HOW DEEP: Which water type?

see FAQ Depends on what?

This is a question of Which Water and Bottom Types 

  • in excess of 30 m

    • with a blue-green pair of bands in clear oceanic or fresh waters over bright bottoms

  • even less than 3-4 m

    • with a green-red pair of bands in highly productive green waters over bright bottoms

  • even less over dark bottoms


 

This is a question of How Much Light

  • More photons yield deeper bottom detection

    • June is best in the northern hemisphere: waters still fairly clear, sun at its highest

    • December is best in the southern hemisphere: waters still fairly clear, sun at its highest

  • Double the amount of photons entails improvement of penetration depth by ~12%


 

This is a question of How Much Rain

  • you don't want rainy season to come into play whith murky river discharges.

 




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