4SM SPOT sanaa yemen

Water type is found to be OIII+0.9 of Jerlov: this is Coastal water type 3 of Jerlov
PANCHRO:
this work used the panchro band in addition to the three XS bands
for another such comparison, see also Bora Bora

XS wavelengths are 550, 650 and 850 nanometers,
plus a SPOT 5 Panchromatic band which is given a wavelength of 590 nm.
bands 1, 2, 3 and PAN become bands 1, PAN, 3 and 4

Unfortunately, the Panchromatic waveband of SPOT 5 does not extend
over the Green range of the solar spectrum:
this severely limits its water penetration,
more so here because of the distinctly coastal water type.

For lack of a blue band, modeling is limited to a depth of ~8 m over bright bottoms
-instead of ~5 m without the panchromatic band.

It should be noted though that with a wider panchromatic band,
one would expect an even deeper depth range.

FCC histeq enhancement	Panchro histeq enhancement
Location of Profile_Blue against a backdrop of the NIR band this shows the regular increase of the adjacency effect as the profile approaches the waterline, from KM 10 tyo KM 45 in the profile	Location of Profile_Blue against a backdrop of the RED band this shows the regular increase of the adjacency effect as the profile approaches the waterline, from KM 10 tyo KM 45 in the profile
Profile_Blue The PANCHRO band is assigned WL=590 nm and stored as band 2 Note: extremely high level of path radiance Note: excellent "deglinting" of the adjacency effect	Profile_Blue zoom System noise is at most one DN in raw data over deep waters, maybe due to very high level of path radiance (a milky sky) although might be the result of re-sampling?? No swell modulated sea-surface glint glint is mostly comprised of the path radiance: a strong sky radiance at La_NIR~=45 a strong adjacency effect ranging from La_NIR~=~45 to La_NIR~= ~60 ==> deglinted profile is quite smooth Glint regressions are excellent
	Sanaa image has a PAN band Optical water type appears to be OIII+0.9, i.e. next to Coastal 3 For some weird reason, it would appear that the NIR band exhibits an unexpected water penetration: 2K_NIR~=3.2 here, instead of ~4.5 usually expected. Although the illumination is maximum in june, and becaus eof the adjacency effect, this image only enjoys a ~100 DNs dynamic range over the deep water radiance in the Panchro and Green bands.

Subset at Al Bodhi island

	The subset below is part of the very large image on the left Note that the whole area is affected by a very strong atmospheric adjacency effect, which is caused by a high content in areosols in the atmosphere and the presence of a very bright continentental mass. This effect gets stronger closer to the coast. This case of adjacency effect is strongly correlated among wavebands, and very easy to remove through the deglinting process. With atmospheric path radiances at -La088.5/63.8/59.5/47.3 in the Green, PAN, Red and NIR bands, this is quite a stuffy atmosphere on June the 12th 2002 in the Red Sea!
This nice enhancement does not show much of the adjacency effect	Deglinting efficiently removes the adjacency effect
Image_Z250 Modeling down to 8 meters, thanks to the use of the panchromatic band	Image_Z250_stepped Modeling down to 8 meters, thanks to the use of the panchromatic band
Image_B Modeling down to 8 meters, thanks to the use of the panchromatic band	Image_LBS Modeling down to 8 meters, thanks to the use of the panchromatic band
	Sanaa image has a PAN band Optical water type appears to be OIII+0.9, i.e. next to Coastal 3 For some weird reason, it would appear that the NIR band exhibits an unexpected water penetration: 2K_NIR~=3.2 m^-1 here, instead of ~4.5 m^-1 usually expected. Although the illumination is maximum in june, and because of the adjacency effect, this image only enjoys a ~100 DNs dynamic range over the deep water radiance in the Panchro and Green bands.
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