Fig. 3: Reticule (pseudophotogram). 
reading method can be carried on by using the 
reticule because, except of some hot points, the 
size of the nodes in the reticule and in the raster 
image are very similar (Baj, <Casalini, Lombardi, 
Tonazzini, 1984). Before the photography is taken, 
the reticule must be put in the principal plane in 
contact with the fiducial marks and the axes of the 
reticule must be put in coincidence with the axes 
defined by the fiducial marks of the camera , with 
the help of an eyepiece. The metric projector used 
has the same prerogative of a metric camera: its 
internal orientation is known and the aberrations 
are those of the body of the metric camera employed. 
PLANIMETRIC AND AXONOMETRIC ARRANGEMENT. 
A planimetric and axonometric arrangement of the 
photography is shown in fig. 4. As said above, 2 
metric cameras and a metric projector were used. The 
aim was to have 2 rasterphotograms and to perform 
both an ordinary stereophotogrammetric restitution 
and 2 rasterphotogrammetric restitutions with the 2 
cameras A and B. The stereo restitution was 
performed by an ACi Wild stereoplotter and the 
raster restitution by the software developed in 
Agip. In that way it was possible to compare the 
results obtained with the AC1 Wild device and the 
results from the rasterphotograms taken with the 
cameras À and B. The optical axes of the cameras A 
and B were set normal to the base connecting the 
nodal points of A and B and horizontal as accurately 
as possible. The photographs were taken in front of 
and behind the object and a topographic survey was 
performed to create control points in order to link 
the photographs of the 2 sides. The photographs were 
taken using ORWO MO1 14 DIN plates with an exposure 
time of 2-3 minutes and diaphragm 8 and they were 
simultaneous. The plates employed are suitable for 
raster photography because of their high contrast. 
PLOTTING. 
Two plotting methods were considered. First the 
usual restitution of stereo raster-photograns with 
     
  
  
  
  
camera camera 
B von de Y + BL 
: i a 
projector 8 projeclor 
| a 
camera Slc mera 
A + + — 3 + AL 
| | 
le m und 
  
  
  
Fig. 4: Arrangement of the photography. 
the AC1 Wild stereocomparator was performed. Some 
problem was found to observe the raster pair of 
photograms because the ratio distance/base was less 
than 2. Despite that the average error of the 
control point coordinates was less than 0.3 mm. The 
results obtained with this procedure have been used 
as a comparison term to check the quality of the 
   
  
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