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International cooperation and technology transfer
Mussio, Luigi

be make denser depending on requirements.
Nowadays, instead, using ot total stations furnished with
a diastimeter without reflecting prisms (and therefore
eliminating burdensome task of signalling the point with
target reflectors), it is possible to acquire the same data
directly in the field.
Differently from a model created by oriented couples of
photograms on which it is easy to repeat the
measurements, a topographical determination of the
cylindrical coordinates of the points imposes an accurate
plan of measurement of a detail. In such manner, to run a
risk of not having the sufficient data to describe the shapes
or, on the contrary, to have a number of information requiring
costly and patient work on simplification of the graphic
design, is being avoided.
During the recognition process, drafts have been issued
with points, duly numbered and linked among them; these
points should lead to a significant line. In the subsequent
acquisition stage, the possibility of using an identification
code permitted the pre-management of the data into files
that group the families of the points and that have been
memorized at different levels in order to facilitate the
management in cad programmes.
File management is fundamental: a subject is described
by means of the points among which the linear interpolation
is programmed; a descriptive structure that derives
therefrom defines wireframe lines, so an operator decides
what should be in-between the lines.
The same lines are, therefore, a result of the choices aimed
at the creation of a model that, as always, is a simplification
and so a scheme of reality, furnished by a sufficient
descriptive accuracy in order to respond to the research
It is advisable to work with a very clear project with regard
to a data bank that, step by step, is being implemented.
In an tree shaped organization, for example, it is possible
to distinguish the lines of different nature: structural, wall
apparatus, the profiles of ornaments and decorations etc...,
changing the rules, already consolidated ones, of
photogrammetric acquisition from the observation of the
model to observation of the reality.
Considering a particular geometry of the structure that, for
each span, occludes the view from the parts of the lines
that confluence from the subsequent onto the transverse
arch, the vertices of the traverse (fig.3) have been set in the
centre of each span of the central nave. From each of the
measuring stations the profiles of the same have been
measured while some points of the adjacent ones have
been used to make a cross reference examination.
On the other hand, if the advantage of the measuring
processes with polar consists in independence of the
individual readings, it also requires a control that in this
case could be easily made by repeating the measurements
of the adjacent point station that guarantees the accuracy
of the operations performed.
For the acquisition of the data, an electronic theodolite
Leica T 1800 has been used due to its features enabling it
to measure the azimuthal directions and zenithal angles
with accura
that is able
mm +1 P-P-
in that way
the reflecti
the area del
cone of the
then, incree
from 6 mm
100 m.
The correct
small laser l
A limited dii
the measuri
has impose
For the pre
the variance
failed to pra
very inclinec
the residual
Figure 4. A view of total acquired data.