Please refer to Stephane Maritorena,
"
Remote sensing of water attenuation in coral reefs: a case study in French Polynesia":
IJRS, vol 17, no 1, pp 155-166, 1996
This study case compares modeling without and with an additional Panchromatic waveband.
Using a panchromatic band where available should be profitable,
even with a 4 multispectral band like Ikonos, Formosat or Quickbird.
for another such comparison, see sanaa
The 10*10 m Panchromatic band has been decimated to a 20*20 m resolution,
and then added as channel 2 of the raw image: ch1=Green, ch2=Pan, ch3=Red, ch4=Nir .
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Green, Red, NIR false color composite
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Green, Pan, Red true color composite
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Image_Z
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Image_Z using the Pan channel
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Image_B
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Image_B using the Pan channel
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Calibration using a Pan channel
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4 bands are used in this calibration:
Green=XS1, Pan, Red=XS2, Nir=XS3
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This diagram reveals bad saturation of the Green channel
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Optical water type OIB+0.74 calibration is derived using the Green/Red pair of bands: very clear waters indeed!
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Maximum penetration of the Pan channel is ~19 m over very bright bottom substrate in this image: this extends the maximum depth of the bathymetry from 6.6 m with the Green/Red pair to 19 m with the Green/Pan pair in these very clear waters.
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The Green/Pan Brightest Pixels Line is a distinctly curved line
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