CIPA 2003 XIX 11 ' International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
where a wonderful wooden ceiling can be appreciated (see
figure 2 right); and the Cambra (Chamber) on the second floor.
Figure 2. Left: oblique perspective of the Salón Columnario
ceiling; Right: detail of the Salón del Consulado del
Mar ceiling
2.2 Use of la Lonja
Although la Lonja was originally built to be the centre of the
city trade, along its history it was used for many different
purposes.
On various occasions, the Salon Columnario was used as an
occasional wheat warehouse when cereals ran short. For
military reasons, the building was converted in 1707 into
quarters, and the Patio de los Naranjos into a cook-room for the
troops. It also became a provisional hospital during the cholera
plague in the XIX century.
Since 1934, the institution Consulado de la Lonja, succeeding
the very old institution Consolat del Mar that was the centre of
the Valencia maritime trade, has been reviving the Lonja de los
Mercaderes gathering traders and industrials. The session takes
place on Fridays. Furthermore, all kind of stamps and coins are
traded and exchanged on Sundays.
3. FIELDWORK
3.1 Instrumentation
The photographic recording was carried out with the digital
camera CANON EOS D60. It has a resolution of 6,3
megapixels. The objective used was the Sigma AF 15-30mm
F3.5-4.5 EX DG with a principal distance varying from 15 to
30 mm.
For the measurement of control points, a Leica laser theodolite
was used.
3.2 The 3x3 photogrammetric rules
The so-called ‘3x3 rules’ have been described for simple
photogrammetric documentation of architecture in those cases
where non-metric cameras are used. These are structured in
three triplets of rules (Herbig et al, 1997):
- Three geometrical rules, where the preparation of
control information, the photographic coverage and
stereo-partners are considered
- Three photographic rules regarding to the inner
camera geometry, illumination and camera format
- Three organisational rules consisting in making
proper sketches, protocols and final check
These rules were considered in our work but, additionally:
- The camera was selected according to a high
geometric resolution, high stability, image quality and
handling.
- A proper camera objective was selected according to
its high lens resolution, low lens distortion and samll
principal distance.
- Photographs were labelled according to a specific
numeric system (see section 6.1)
- An interactive digital catalogue was made in order to
visualise comfortably all the data (see section 6.3)
3.3 “In-field” work
3.3.1 Photograph collection
Photographs were taken with a side overlap of more than 70%
for stereo-partners. Oblique photographs were also taken from
various points of view in such a way that every part of the
building is at least three times imaged (usually four or more).
(b)
Figure 3. Photographs taken from the third floor of the opposite
building: (a) upper-side normal image; (b) middle-
side oblique image.
For the exterior facades, distant to the object could not be kept
constant due to some narrow streets surrounding the building.
In those cases, photographs were taken from the ground floor in
the street and also from a first, second or even third floor of the
surrounding buildings (when possible, figure 3a) in order to
avoid too forced perspectives (figure 3b).
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