Bathymetry and water column correction
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


  • Same day: once the image file is ready on disk, one work day is enough for an experienced 4SM practitioner to obtain a reasonable result out of a 4-bands image.
  • Longer: finishing can take a while, though, depending on
    • the radiometric quality of the image
      • system noise, banding, cross talk, bright target recovery
      • oblique viewing
    • the size and complexity of the scene
      • clouds and shadows
      • floating alien objects, like boats, seaweed mats, foam, etc
      • wind conditions and breaking waves
      • glints and adjacency effect
      • heterogeous water types, and locally foul waters


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