CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
522
since the limitations of the objects that are self-covered
(concave) are somehow narrowed with the availability of more
data coverage. Moreover, new products can be available, such
as the production of ‘3D orthophotos’, which is the
orthoprojection of photos onto a unified dense DTM of the
whole object derived from laser scanner data (Lingua and
Rinaudo, 2001).
Figure 9. Basic interpretation of laser scanner products is easily
performed in freely-available viewers
In this project, various combinations of photogrammetric and
scanning data of the sculpture of Hermes have been attempted.
The most important are:
• testing the compatibility of the two data sets by transferring
dense (every 1cm on the statue scale) horizontal sections
derived from the merged data of the photogrammetric
restitutions, onto the 3D solid model derived from the scans.
This procedure has indicated the existence of systematic
errors among the photogrammetric models, that were
properly corrected
• orthophoto production (of parts) of the statue using the TIN
net derived from the scanned data and breaklines
photogrammetrically produced.
5. CONCLUDING REMARKS
Photogrammetry is an elegant measurement method
traditionally used in cultural heritage applications. The
shortfalls of this method, mainly associated with limited
geometry of areas in the shadow of the object, are more
prominent when the object is a large complex statue, such as the
one described in this paper. The recent emergence of terrestrial
laser scanning has shown that has the potential to be of major
value to the cultural heritage recording professionals. While
data collection in this project using the two methods indicated a
small gain in time over laser scanning (two days scanning
versus three days for photo images), the main advantage is the
fully automated data capturing process using terrestrial laser
scanning. Furthermore, this technique does not require the
relatively strong restrictions to be fulfilled by the stereoscopic
images, such as having the two different bundles to cover the
same body parts and the rays to homologous points to intersect
at good angles.
While both photogrammetric and laser scanning techniques can
deliver similar type of products the end users are accustomed to
have, such as line drawings, DTM etc., the interest mainly lies
in the supplementary role these types of data can have in 3D
model creation. In this project independent 3D models of the
Hermes statue have been created to allow evaluation studies
being performed. Future work currently concentrates into
matching and integrating local detailed scanned areas into a
global model defined by photogrammetry using fairly
automated operations.
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