2.2 THE IMAGES OF THE BASILICAL DOMES
If the David is located in the branch of
research of the 3-D representation, the
images ‘branch is studied in the St.
Marcus domes. In particular in the
applications of the Spirito Santo's
(Pentecoste) (Fig.2) and Ascensione's
domes the corresponding DTM has followed
the methodology before indicated.
We are working with a geometric surface
not plane, but easly trasformable to a
semispheric spatial shape, without hidden
points and discontinuites; it's the DTM
of the dome (Fig.4).
Unfortunately the times of intervention
on a monument open to the public, with
4000 visitors every day, make every
operation always very long and, for this
reason, we are still in a qualitative
phase of individualization of the
methodological process illustrated in the
associated paper (Brumana R., Vassena G.
"St.Marcus’ Basilica in Venice. Analysis
of digital images projection”).
The projection of an image on its
belonging surface has, as a consequence
the overcoming of the conception of
bidimensionality of the image.
It happens a convergence between the
disciplinary approach of the conservative
intervention on the surfaces and the
disciplinary approach on the survey
itself.
In fact a relation more and more closer
with the third dimension appears. It
FIG.4 THE DOME OF ASCENSIONE. ST. MARC
THREE-DIMENSIONAL ELABORATION
US’ BASILICA.
creates a new bridge between two worlds
that, in the history of the restoration,
had follow different assumptions and
operative choise. The first one of the
structures and the second of the
surfaces, decorated, plasted, with
mosaic...., that too often has been
reduced to the images. Infact often the
matter, which introduced a great cultural
thickness, also physically, is negleted
(Fig.5).
This research has been developed using of
Fondi MURST 40% 1990/1991
REFERENCES
1. R.BRUMANA, G.GALEAZZO, C.MONTI, E.VIO,
"Rilievo e rappresentazione della Basilica di San
Marco a Venezia: iconografia storica e attuale
per un sistema informativo integrato". Atti del
CIPA XII Symposium International de
Photogrammetrie Architecturale, Roma 1989.
2. G.GALEAZZO, "Approccio metrico ai grandi
organismi architettonici: metodiche analogiche e
digitali nei rilievi della Basilica di San Marco
a Venezia". Atti del convegno "Componenti
architettoniche dell'identita' ambientale:
situazione attuale e linee di tendenza", Milano,
aprile 1988
3. M.MATTEINI, A.MOLES, "Scienza e restauro -
Metodi di indagine", Firenze 1984.
4. R.BRUMANA, "The Hall of the Fountain in the
Zisa'palace and the Palatina’s chapel in the
Norman palace in Palermo. Graph-numerical data
bank and image data base to run and use different
surveies". Atti del CIPA XII Symposium
International de Photogrammetrie Architecturale,
Delphi, 2-5 October 1991.
5. R.BRUMANA, B.CRIPPA, G.VASSENA, "Analytical
treatment and description of the altimetric
check of the St. Marcus’ Basilica in Venice",
ISPRS Symposium Commission V, Zurich, 3-7
Settembre 1990.
THE PHOTOGRAMMETRIC
RESTITUTION: THE DIGITAL MODEL HAS BEEN TREATED WITH SOLID
MODELLING AND SMOOTHING OF THE ELEMENTARY SURFACES.