636 
Figure 3. SPOT-HRV FCC of the northern Chott el 
Djerid, the road can be seen traversing the chott. 
The areas of aeolian activity (a), aioun (b) and 
salt crust (c) are easily identifiable. 
Figure 5. Landsat MSS FCC of the Sebkhet el Hamma 
from 1981. The detail in the chott has been 
increased by contrast stretching the chott at the 
expense of the surrounding areas but El Hamma (EA) 
can still be seen. Vegetation and salt patterns 
relating to surface water flow from the surrounding 
uplands is seen funnelling through the neck of the 
sebkhet as it enters the Chott El Fedjadj to the west. 
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Figure 4. Landsat TM (right) and SPOT-HRV (left) 
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Figure 6. SPOT-HRV FCC image of part of the Chott el 
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(i) the variable size of the aioun in the east of 
the image and (ii) the multiple flow-like features 
in the thin salt crusts, with cross-cutting 
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water flow. 
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