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Effects of depth and reflectance
As noted in 'Effect of colour
and depth', increasing depth increases attenuation of
sunlight in the water column due to scattering and absorption.
These graphs show the effect of increasing water depth on
the spectral signatures of four common benthic cover types.
As depth increases, less red light and more blue light are
recorded by the sensor. The spectral signatures at 1m depth
(light blue line) would be seperable, whereas the signatures
at 10m depth (dark blue line) are not seperable.
Acknowledgement: Joyce, K.E. and Phinn, S.R. (2002) Selecting
image processing routines for coral reef substrate discrimination.
In 'Proceedings of Ocean Sciences 2002, American Geophysical
Union/American Society for Limnology and Oceanography, Honolulu,
Hawaii, Feb 10-15.
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