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Image quality. Atmospheric and various technical factors 
stipulate differences in the image quality, especially in 
tonal contrasts. These differences are sometimes bigger 
than between imagery in different spectral bands. A good 
example shows the comparison of the presented high quality 
Scanogram and the adjacent eastern ones (1289-08421 and 
1371-08423), which show low tonal contrasts and display 
a low level of information. 
All these factors may result in different interpretations. 
To an experienced geologist, who is aware that multiple 
interpretation is possible in any kind of investigation, 
this fact is only natural and expected. 
THE RUPTURAL FABRIC 
A thematic map of fractures, produced as mentioned above, 
presents a very well developed ruptural fabric. There are 
two conspicuous systems: : NW-SE and NE-SW, with a possible 
weak N-S system and numerous fractures which cannot be 
included either in these or other systems. (Fig. 2) 
The NW-SE oriented system forms a conspicuous Skopje-Strumica 
zone (1; numbers in brackets refer to Figs. 2 end 5). In 
other parts of the SR of Macedonia only single fractures 
of this system are seen. The main fault in the Skopje-Stru- 
mica zone controls the course of the Vardar river from 
Skopje to Valandovo, about 140 km in length. It is 
accompanied toward NE by a number of parallel faults 
- Kriva Lakavica graben (2), Stip-Strumica and boundaries 
of the Strumica depression (3), faults toward Kratovo 
and Plaëkovica (4), etc. In the Skopje domain these faults 
bound on the Karadag Mt.(5) toward the Skopje depression. 
Along the faults of this system numerous grabens are 
formed; the most impressive are the Skopje (6), Kriva 
Lakavica (2) and Strumica (3) grabens. To the south, faults 
of this system are noteworthy from the line Debar-Bitola.