itional method for 
ig to the obtained 
.ni (1985) . 
■pe of image stem 
: regional study it 
l recognize the ae- 
.c elements. A part 
olution provided 
mt (the latter 
lain tectonic 
:t faults) are hi- 
. high plain to the 
ns of this type 
k of details pro- 
difficult to de 
contradictory . 
appears linked to 
orms although they 
t movement. Vast, 
7 further impeded 
, those in F.C.C. 
ter number of 
y eroded areas or 
edimentation, ele- 
work, etc.. This 
s characterizing 
tational and hy- 
greater contrast 
urrounding areas, 
those areas pre- 
and 7 LANDSAT 
entification of 
hese same images 
some characteris- 
uch as: planime- 
extrapolating re 
nted photoalign- 
Panchromatic black and white photomosaic 
This photographic support, which was to integrate the 
data drawn from the LANDSAT images, proved only par 
tially useful. In fact, in the high plain area, it did 
not provide any more data than did the SLAR images. 
It only provided useful integrating images for neo- 
tectonic qualification of the photoalignments in the 
Cordigliera areas. 
5 CONCLUSION 
The black and white band 7 LANDSAT images proved la 
cking in information due to their inability to iden 
tify features which could, with any certainty, be at 
tributed to recent tectonic movement. In comparison, 
the F.C.C. LANDSAT images provided more morphotectonic 
elements although these were not sufficient to neo- 
tectonically qualify the photoalignments. The SLAR 
images proved most useful in detailed study. The sca 
le factor and improved ground resolution led to the 
identification of new basic patterns as well as ele 
ments accompanying the main trends which had emerged 
through the LANDSAT images. 
All the above contributed to better defining the 
nature of the features, especially in regard to neo- 
tectonic. This thanks to the identification of the 
morphology and associated lesser structural elements 
as well as the unmistakable identification of layers 
and lithological limits. 
On the other hand, the photomosaic proved most use 
ful in the Cordigliera areas. It would have been pos 
sible to glean further elements by stereoscopically 
studying each individual photogram. This is especially 
true for the identification of morphological elements 
linked to a lack of altimetric continuity. 
In conclusion it may be asserted that a regional 
study of this type requires the analysis of both 
"small scale" or limited resolution and "larger scale” 
or higher resolution images. This is so because no 
neotectonic conclusion can be draw from an initial 
wide observation and identification of photoalignments. 
Nor can they stem from a subsequent check and classi 
fication. They must, rather, be derived from the ob 
servation of local morphoneotectonic elements which 
only high resolution images can provide. 
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r. They proved 
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DSAT images, 
in areas where 
f this type of 
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