International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004 
  
6. GIS DATA ANALYSIS 
Using Arcview GIS 3.2 software, the information acquired by 
the hyperspectral techniques were overlaid on morphologic data 
and on the historical road network map. 
The testing area shows a variable morphologic state. The 
altimetric range is between 380 and 850 m. Interpolating the 
level curves of the vector Regional Map at a scale of 1:10,000 a 
DTM with 10 m grid-cell was generated. From DTM slope map 
with 3 classes was obtained: between 0% and 10%, between 
10% and 20% and between 30 % and the maximum slope value 
in the testing area (fig.6). 
Taking in consideration that the probability of finding 
archaeological settlements decreases if the slope increases, a 
numeric value was given to each slope class as higher as the 
class value is less. In particular to the first class was given the 
10 value, to the second 6 value and to the third the 2 value. 
  
  
  
  
Figure 6. Slope map 
For the rebuilding of the historical road network the historical 
maps were taken in consideration (Jtinerarium Antonini e 
Tabula | Peuntingeriana), which give information on the 
principal crossing routes in the III-IV century Sicily. Those 
routes were crossed with the “Regie Trazzere" and other paths 
of minor importance so the location of antique routes could be 
conjectured, nowadays removed. P. Orsi, famous archaeologist 
in Sicily of the first of XIX century, wrote that: *.... almost all 
the old Regie Trazzere were the bad and big roads of the Greek 
and Roman antiquity". The road information is important 
because it is possible that along the connection roads, other 
archaeological settlements could be finding. 
The roads individuated were digitized and a map with three 
classes was done. Each class contains the roads with the same 
historical importance; subsequently, greater is the historical 
importance of the classis and higher numerical value given to 
the class; also in this case, the values 10, 6 and 2 were chosen. 
Interpolating this information a map was done in a raster 
format, where the nearer pixel to historical road network the 
higher numeric value given to the pixel (fig. 7). 
496 
All information acquired were overlaid: in particular a synthesis 
map relative to the Villa del Casale area and to Sofiana area, 
which contain hyperspectral information, the slope map and 
historical road network map were put together to obtain one 
unique map where the greater the probability to find settlements 
archaeological and the higher numeric value of the pixel. The 
figure 8 shows a particularity of the overlay of pixel, of red 
colour, with high probability of the presence of buried 
structures, in the MIVIS streak in real colours. Observing the 
figure two areas are characterised by a greater presence of red 
pixels. 
  
  
  
   
  
  
  
  
  
  
  
Figure 8 Prediction map of archaeological finds 
overlaid on MIVIS image