8 cm), by 5 couples 
on of stereoscopics 
of the plant and the 
carried out, using a 
n photograms) with 
n focal length and 
Le 
  
gram 
‘ilm Camera (n. 8 
ulon 65mm, 
camera (7mm focal 
ition allowed by the 
s for each one. 
| cameras have been 
grammetric Scanner 
>s of about 200 MB 
era 
pic models through 
by SISCAM 
| a suitable stereo 
ith procedures of 
btained the Digital 
h the automatic 
of the Stereometric 
ain a grid of 5x5cm 
s a very interesting 
laboration. 
)XF files in order to 
the cloud of points 
of image in digital 
canner (Fig. n.4). 
Figure 3: Photogrammetric cloud of points 
  
Figure 4 : Laser Scanner cloud of points 
These different files have been treated in GIS enviroment 
(Arcview 3.1 with 3D Analyst ) to obtain three-dimensional 
models ( DEM) with the typical instruments of 3D analysis, 
like shows in the following images : results of 
photogrammetric survey (Fig. n. 5) and results of Laser Scanner 
(Fig. n. 6). 
Later we have compared the results of the two techniques of 
DEM production by pointing out the qualitative characteristics 
and verifying the usability in order to extract metric 
informations by digital representation of the architectonic 
building. 
In spite of remarkable problems concerning the corrected 
definition of suitable breaklines and difficult extraction, the first 
DEM by photogrammetric survey with 5 x 5 cm grid of 
acquisition, gives a very interesting result. 
  
  
Figure 5: Photogrammetric DEM 
The second DEM produces a more detailed model than the 
previous one, thanks to the denser grid allowed by the Laser 
scannning methodology, and presents less accuracy in the part 
where the Scanner Laser has produced a little number of 
extracted points. 
This problem will be resolved when all the four model by Laser 
Scanner will be linked in only one reference local system that 
involves all the Church. 
  
Figure 6: Laser Scanner DEM 
3D Model 
An interesting experience was the realization of a three- 
dimensional model of the Church starting from the digital 
images of the EOS Systems Inc. Photomodeler software, which 
let us realize the 3D model of the building using at less two 
digital photos. 
The result consists of a 3D model easily navigable in the three 
dimensions even with a normal browser internet ( Internet 
Explorer ...) equipped with a plug-in for the VRML. 
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