A 1647*1235 Landsat ETM 4 bands image
of Heron Island, Great Barrier Reef, Australia

work done in 2005

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
I keep digging
until suitable data
become available


False color composite, raw data


True color composite, raw data
histeq enhancement


True color composite, deglinted data


image Zstepped


image B


image LBS
true color composite


image BSC



Optical calibration
Optical water type OII+0.2

Zoom window

over Heron Island

False color composite of raw data
over Heron island at full resolution

image Z stepped

image B

image LBS

image BSC

image WZ

image WR