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Title
New perspectives to save cultural heritage
Author
Altan, M. Orhan

CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
277
Radial
Distance
A Rollei Value A
and Self
Calibration
(mm)
(micron) (pixel)
0
0 0
2
2 0
4
3 0
6
4 0
8
4 0
10
4 0
12
3 0
14
1 0
16
1 0
18
1 0
20
0 0
22
5 1
24
16 2
26
35 4
Table 5. The different value of radial distortion
It turns out demonstrate to you as between the curve of
distortion supplied from the constructor for the used prototype
of camera and that calculated a posteriori, substantial
superimposition is one.
2. APPLICATION EXPERIENCE
2.1 3D digital orthophoto at scale 1:1 of the mosaic surface
of the S. Marcus Basilica in Venice
The problems lie in the conservative restoration done on the
floor which require a 3D reproduction to a 1:1 scale, in order to
identify and replace damaged parts, as well as to install them
while maintaining the characteristic altimétrie irregularities,
typical of the floor. It is clear that a strictly "plane" floor would
not reflect the historic value to which we are accustomed .
Here then, we have a modellation using a 3D orthophoto and
an automatic extraction with altimétrie profiles for constructing
templates to a 1:1 scale of the mosaic floor (measuring about
2000 m2). The object of application of the techniques proposed
which must measure up to the economic and scientific aspects.
In the practical application it is proceeded in order is made
successive that they have carried to the construction of
following catalogues of data:
the archives of the photographic images realized with the
camera Rollei DB44metric with characteristic following,
height 2.2m, covering to floor of 2m longitudinal, covering
60% and cross-sectional covering 10%;
the archives of the GCP to use in the phase of support of
the Aerial Triangolation;
the archives of the points of level used like control
element;
the archives of scansions Laser in order to test a
comparison between speed of execution of the measure and
utilizzabiltà of the data;
generation of DTM by means of process of
photogrammetric auto-correlation comparison between the
DTM produced by means of laser scanner and model for
auto-correlation
verification and comparison with the sections type;
creation of the 3D digital orthophoto of the pavement.
As far as the first point the center of the basilica has been found
completely and a meaningful champion of some photograms is
itself chosen (13) in order to carry out the sampling.
Figure 7. Particular of the zone interested from the research,
with the model laser of the pavement and one crawled of photo
For the generation of a model 3D of the mosaics it has been
used the laser scanner Mensi GS100, whose technical
characteristics are:
range
2- 100m
scanning speed
up to 5000 points per second
standard deviation
6mm
angular resolution
0.0018°
spot size
3mm at 50m
From cloud of points therefore finds has been created one
surface GRID with step 2mm.
For the phase of Aerial Triangolation of (2 strips with a total of
13 photos) has been used the software APEX.