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.