A 1401*1006 EO1-ALI 6 bands 16-bits image of Salar de Coipasa, Bolivia. January 26th, 2003
A 597*1554 EO1-Hyperion 26 bands 16-bits image of Salar de Coipasa, Bolivia. June 5th, 2004
image EO1A0010732003026110PZ, courtesy of USGS_Glovis; this image subset is 42 km across , pixel size 30 m
Salar de Coipasa is a slat flat located in the Atacama desert in Bolivia, at an altitude of ~3700 m.
It provides the opportunity to investigate the linearity of the linearized simplified radiative transfer
at extremely shallow depths over a uniform and very bright bottom, just like Tarawa atoll.
Because depths hardly exceed ~ one meter, the deep water radiances may not be estimated for the visible bands.
This is not too much of a problem though, as the Lw term is mostly important at depth over dark bottoms;
non vegetated desert land and cloud shadows allow for a fairly good estimate of atmospheric path radiance.
Band | 1 | 2 | 3 | 4 | 5 | 6 |
Colour | blue | blue | green | red | nir | nir |
WL in nanometers | 443.0 | 482.5 | 577.0 | 660.0 | 790.0 | 867.5 |
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<== Bottom reflectance
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![]() Computed depth | ![]() Average bottom brightness |
![]() image WZ | Black line
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Calibration_diagram_6_5_4_2 full image Calibration_diagram_6_5_4_1 full image Calibration_diagram_5_4_3_1 full image Calibration_diagram_4_3_2_1 full image
| Calibration diagram for the Blue/Red pair |
#Salar de Coipasa Salar de Coipasa Salar de Coipasa Salar de Coipasa Salar de Coipasa 3,656 meters above the mean sea level #exit #Following is the full CommandLine=====mBPL=2================================== exit #Following is the full CommandLine=====mBPL=2================================== |
image EO1H0010732004157110PY, courtesy of USGS_Glovis; this image subset is 7.8 km across , pixel size 30 m
26 bands used: band spacing is 10 nm from 447.2 nm to 691.4 nm, NIR is at 844.0 nm
Raw image, false color composite | Computed depth |
True color composite of spectral bottom reflectance | Average bottom brightness |
Calibration diagram for Blue, Green, Red and NIR bands Optical water type ~OIII+0.3 in a low water situation Quite frustrating though, as the depth does not exceed ~1 m in june 2004 |
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