1 - NO NEED for field data, nor for atmospheric correction
2 - this is demonstrated in this website, using a variety of hyper/multi spectral data
 
Requirements are
1 - homogeneous water body and atmosphere
2 - some coverage of optically deep water
3 - some coverage of dry land
 
Problems are
1 - the precision on estimated depth is found wanting, because the noise-equivalent change in radiance  of accessible data is too high for shallow water column correction work 
2 - radiance data should be preprocessed by the provider at level 1 in order to improve S/N ratio
3 - exponential decay: the deeper/darker the bottom, the poorer the performances
 
So
I keep digging
until suitable data
become available
 

4SM and attenuation coefficient 2K

Dans General

What about the operational attenuation 2K in the simplified RTE? This all important question is discussed in detail by Maritorena et al, 1994, in their paper "Diffuse reflectance of oceanic shallow waters: influence of water depth and bottom albedo". I have come to suspect that shallow areas in a deglinted remote sensing image allow the practioner to derive a very good estimation of the value of spectral operational 2K in units of m-1 : Radiances in units of native image DNs may used: conversion into reflectances (0-1) is not a requirement when operating a "ratio m...

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4SM and ENVI

How about implementing 4SM into ENVI? Now that NOAA's method is available in ENVI: Spear Relative Water Depth This is "a bottom albedo-independent Bathymetry algorithm developed by Stumpf and Holderied (2003)" Time has come for 4SM to follow suit and show its strength as it definitly should take over! Time has come for 4SM to be operated through cloud computing....

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4SM and DigitalGlobe

About DigitalGlobe's BathymetricCompendium.pdf 2013 WATCH DigitalGlobe's bathymetry webinar 2013 THEN    review my invited comments...

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