International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part BS. Istanbul 2004
present the 3D model of Scrovegni Chapel is still under
editing, in order to fill the holes due to occlusions and to
generale a simplified version of the model lor texturing
purposes. Figure 13 shows a global view of the meshed model.
Figure 13. The meshed 3D model of Scrovegni Chapel
5. CONCLUSIONS
In this paper a short review of issues related to a 3D survey
with multiple ground-based laser scanners has been presented.
A very precious and famous artistic piece of the Italian cultural
heritage; the Scrovegni Chapel in Padua, Italy, was surveyed
using four different laser sensors. This church was choosen
because of its simple architecture, which allows a clear view of
most of the structure, and the presence of frescoes, painted by
Giotto in 14" century, whose figures could be used to easily
identify matching points during the scan alignment stage. As
the church could not be completely surveyed with only one
laser scanner, the corresponding 3D model has been obtained
mixing together the best data sets collected with the four
sensors. During surveys, two of them showed an unpredictable
behaviour, resulting in a low quality of the intensity response,
what in some cases prevented us to use collected scans for the
alignment.
Basically this work showed that range data collected with
different scanners and resolutions can be succesfully merged
together to generate a unique 3D model, even if the final model
accuracy can be mainly dominated by the more noisy sensor.
However this experience highlighted a further issue related to
the range data-based 3D modeling applied to cultural heritage
objects: though laser scanners allow to collect a huge amount
of data in short time, the data processing and editing stages can
become very time consuming when a detailed 3D model of
architectural shapes is required, given their high complexity.
Acknowledgements
This work was developed with the project *Application in the
survey, store and management of environmental and cultural
resources of. GNSS/INS positioning and satellite, aerial,
terrestrial photographic and laser scanning data, transmitted by
DARC, GSM/GLOBAL STAR, INTERNET methods", partly
financed by MURST (Italian Ministry of University and
Research) in 2002 as project of relevant National interest.
National coordinator: Giorgio Manzoni, head of the Research
unit Antonio Vettore. We also acknowledge the Castello del
Buonconsiglio for unrestricted access to the room during non-
visiting hours.
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El-Hakim S. F. 2001. 3D Modeling of Complex
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Guarnieri A., Vettore A., Tucci G., Guidi G., 2003. Towards
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