Cl PA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
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Figure n. 9 The model with mesh surface and vertical sections.
“ Grotte di Castellana “
Also in the “ Grotte di Castellana “ we have realized two laser
scanning acquisitions the first for the cave all around 360° at
lower resolution and the second one for the stalagmites group at
the highest resolution of the instrument.
In this survey we haven’t moved the position of the Laser
Scanner and then we have merged the two clouds of points
without registering any targets.
In the next figure we shown the two clouds of points only with
3D coordinates obtained in a very short time.
Figure n. 10 The cloud of the cave and of the stalagmites group
Also for the caves we have product a meshed surface of the
stalagmite detail and in the Fig. n. 11 we show in the same time
the surface and the horizontal sections obtainable.
Figure n. 11 3D mesh of the surface and horizontal sections.
4. CONCLUSIONS
The achievable accuracy with any specific technique determines
a considerable variety of attainable products that vary from
navigable three-dimensional models for tourism to 3D
Information System for Architectural Heritage conservation and
restoration.
Recent instruments with minor accuracy achievable (digital
cameras, etc.) can certainly be utilized for three-dimensional
models, also with 3D Modelling and Virtual Reality techniques,
in order to permit knowledge and fruition of monuments.
The laser survey acquisition has permitted three-dimensional
coordinates identification of scattered points. These describe an
opportunely treated geometry of surveyed object and consent
three-dimensional model realization of its exterior surface.
This model can aid image analysis operations, supporting
future Restoration and Conservation projecting decisions.
This study shows that both the used systems easily produce an
three-dimensional model enjoyable in Virtual Reality with the
characteristic of further information both of form that metrics in
the case of the Laser, while with greater semantic contents in
the case of the Photogrammetry.
The same modem laser systems (i.e. Mensi) they already allow
to associate to every surveyed point the relative value RGB.
We believe that, in the future, we will be able to use the
methods of metric survey as the Laser Scanning and the
Photogrammetry to get both summarily resulted descriptive of
the volumetries of the Monuments.
In the next searches the procedures of merge will be verified
among the products of the two systems of survey with the
purpose to improve the quality of our model 3D for the Virtual
Reality.
The authors thank Mr. S. Lemma (GeoTop srl, Ancona, Italy)
for kind availability of Laser Scanning Instruments.