CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkev 
be performed 
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otogrammetry 
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rfaces, digital 
le to define in 
the contours 
metric use of 
he other kind 
conservation 
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to furnish a 
(Aosta) in a 
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s taken place 
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al., 2001) is 
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r to produce 
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»city requires 
’.o-photomap 
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„, previously 
lei. This new 
id a building 
in select and 
tudy. Just as 
stereoscopic 
examination not only provides much information, but is a very 
legitimate end result in itself. 
4. SURVEY AS STUDY OF 
HISTORIC BUILDING EVOLUTION 
The Borgo del Valentino, an accurate reconstruction of an 
medioveal castle and village of the Aosta Valley and Piedmont, 
was built in 1884 as part of 1st Italian General Exibition. The 
most important planner was Alfredo D’Andrade, one of the major 
protagonists in the stylistic restoration of the post-unitary Italy. 
His aim was to offer an outline of the principal aspects of 
civil and military architecture of the XV century in the Savoy 
territory. 
The building complex which underwent the most significant 
transformation is San Giorgio tavern, our case study. 
The recent maintenance works on Borgo del Valentino, gave an 
opportunity to apply a new surveying campaign ending up, on 
the one hand, in documentation and control of the restoration 
procedures that are in progress, and, on the other hand, in analysing 
the geometry of the building in relation to the construction stages 
and the subsequent adaptations that were made thereafter. A 3D 
model can help to investigate and then to comunicate how a 
structure is built up and transformed. 
Figure 1. A view (1884) from the Po river of the 
Borgo del Valentino (photo: fondo D’Andrade) 
4.1 Data acquisition 
The first phase of this survey was dedicated to the planning and 
realization of a traverse to fit the whole site, consisting in total of 
14 vertices, organized according to two different levels, main and 
secondary and characterized by high precision (points accuracy 
inferior to the centimetre) (Figure 2). Along with the traverse, all 
detail points necessary to elaborate a 3D model and photographic 
control points to use digital images rectification as model texture 
were surveyed (with a reflector less total station). 
Figure 2. The plan of the Borgo del Valentino: 
scheme of the main and secondary traverse. 
til 
Un 
mm 
« w 
Su. 
Figure 3. 3D reconstruction of the buiding complex 
Figure 4. The green space at the back of the tavern is 
represented in one lithograpy of the period and in a 
3D model render view. 
V 
'1 
Figure 5. Simulation of S. Giorgio tavern in four different historic 
phases: (a) in 1884; (b) from 1900 to 1930, when a street was 
constructed in order to safeguard the foundations of the buildings 
from the river overflowings; (c) from 1930 to 1950, after postwar 
reconstruction; (d) from 1950 to 2003 after next elevation. 
4.2 Plotting 
The 3D data obtained using this methodology constitute a valuable 
documentation for any future control references or subsequent 
modifications. Once the plotted image has been made, it would 
be difficult to distinguish those features that have been measured 
from the ones that are the result of subsequent interpretations. 
Therefore it is necessary to preserve accurately a file containing 
the justification documents: the field book, the calculations and the 
drafts that will allow an identification of the holes, interpolations 
and secure elements, and therefore allowing a later control of 
the validity of information. On the other hand, even thougt the 
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