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International cooperation and technology transfer
Mussio, Luigi

Fig. 7 - Metric camera settling in the upper side of
the aisle of the Ospedale dei Crociati.
2. Archaeological excavation documentation
regarding the refurbishment of an historical
During the refurbishment of Ospedale dei Crociati di
Molfetta (Bah) the need for a detailed
documentation of the bottom of the archaeological
excavation beneath the nave and the aisles.
The presence of masonry marks of ancient
structures, pillar foundations, water basins, water
downflow canals etc., made the photogrammetric
survey project really complex. It was decided to give
priority to the production of a coverage with nadiral
shots in a photo-scale suitable for plotting up to
The need for the usability of the survey also by art
historians, not skilled to operate on a 3D vector
graphics, suggested the production of a
orthophotomosaic of the whole surface involved in
the excavation.
2.1 Design and execution of photogrammetric
The frame scale attained, of about 1/40-^1/50, is far
larger than the minimum required and was
conditioned by the available distance.
A D.E.M., with a 30x30cm grid, has been manually
constructed with an analytical stereoplotter Siscam
Stereocart after about a fifteen hours work. The
orthophotoprojections have been executed with the
S/W StereoView (Nikon Instruments S.p.A.), and
there wasn’t any operational difficulty, apart from the
size of the flies that compose the whole b&w
orthophoto-mosaic (about 70MB).
3. Conclusions
The experiences made demonstrate how the
production of single orthophoto, and of mosaic of
ortophotos, is really useful for users not skilled to
take the most of the capabilities of 3D vector
graphics. The interpretation of digital orthophotos
seems to be much easier for the not skilled users,
but contains small areas where the pixel distribution
is less clear. The reference is to all the zones where
the photographic shadows, together with the sudden
altimétrie variations, require the completing of some
areas that lack in photographic information, in all
this areas the final image should be edited and
cleaned, substituting the orthoprojected pixels in the
adequate performance, also enough fast.
The result showed a good quality, being the
analysed surface without any photographic
discontinuity and shadows, together with the high
density of D.E.M. according to the characteristics of
the altimetry of the object.
The settling of the camera, also in this case a UMK
10/1318, was made with scaffolds constructed at the
vaults intrados at about 4-7-5 m from the floor, with
an auto-built support suitable for nadiral