78 
equipment like a graduate tape, donbie meter . plumb 
line, square. 
The figure n°2 shows the result of this work at 1:50 scale. 
Fig. 2 - Planimetric survey of the church 
The prospects photogram metrical survey 
For what it concerns the terrestrial photogrammetrical 
survey of Marmashen we realised different kinds 
photogramms . following the method to be adopted in the 
restitution phase, and in relation to the inner 
characteristics of the various prospectsand of the specific 
environmental situation (exposition, facing space, 
different encumbrances, etc.) 
For example the main façade (fig.3) that for the ruin 
state, needed a more accurate survey, which was only 
possible with the classical photogrammetry. has been 
surveyed with couples of photogramms made with the 
ZEISS TMK6 camera with a 60 mm focus and formed 
with photogrammes of about 8x11 cm 2 . 
Fig. 3 - The main façade of Marmashen church 
Talking about the taking of photogramms regarding this 
monument section, the topographical conditions and the 
façade size have determined the necessity to install a 
scaffolding that made possible the taking place of the 
photogramms taking at about 3.50 metres high. 
The determination of support points took place in 
applying the topographical method of the simple forward 
intersection. 
Every model has been restituted on the basis of pre 
signalled coordinates points (at least 5 for every model) 
obtained by the angular measures took with the Wild T2 
teodolitc. 
For the restitution we used the WILD BC3 analitic 
stereorestitutor consisting in a restitution device and in a 
computer system with its different parts. 
The computer is installed on a special projected desk 
provided with all the peripheral equipment. 
The standard configuration includes a high resolution 
graphic monitor with 256 colors and a mouse with three 
keys. 
The base unity for the restitution is installed on a special 
table containing the optical and mechanical components 
necessary to observe the photogrammes and to move the 
trolley on which they are settled and a computer checking 
the restitution process. 
The software is able to explore the image points of the 
model calculating mathematically the coordinates of 
every correspondent object point. 
The different restitution phases are visualised in real time 
on a high definition graphic monitor and can be easily 
managed by an articulate "multiple-window" menu. 
Beginning from photogrammes couples, obtained by the 
already mentioned metric camera and by numerical files 
containing the support points coordinates located on the 
object as already stated too, we obtained a three- 
dimensional optic model that itself can be restituted in 
numerical or graphic data using output on monitor, 
printer, plotter, floppy disk. 
Using this method it was possible to obtain high level 
results in the three dimension for w'hat it concerns the 
precision (the mistake is in fact equal or inferior than the 
graphificism error of the chosen representation scale, 
related to the photogrammes scale) (fig.4). 
Fig. 4 -The west prospect of Marmashen church 
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