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Title
New perspectives to save cultural heritage
Author
Altan, M. Orhan

CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
2.3 Architectural Survey of Standing Buildings
The use of programs, such as AERIAL 5.3, for 2D photo-
rectification and PhotoModeler for 3D modelling, has shown
how detailed documentation, such as plans, sections and
elevations of buildings, can be produced from digital
photographs using only a limited number of measurements
(Figs 5a to d). The results of such surveys can be presented
graphically in considerable detail even when time and resources
in the field are limited. Data can be collected during a short
period of recording on site but subsequent processing in the
office is necessary and it must be remembered that this can be
time consuming.
!
The methodology is similar to that used for the archaeological
remains described above, but emphasis is put on precise
recording of the architectural features and details. The
rectification program used, AERIAL 5.3, processes a grayscale
photograph from a minimum of four known points, gives
excellent results and is not too demanding on computing
facilities or expertise. These photos are then imported into an
AutoCAD drawing where a simple profile can be drawn from
only a few key measurements (Fig. 5b). In most cases the aim is
to produce AutoCAD ortho drawings (Fig. 5c and d). Digital
capabilities can be extended to the representation of earlier
phases of a building as seen for the Storehouse (Fig. 5e) or
indeed to put forward restoration schemes when desired.
Finally, elevations that record individual stones or details are, if
desired, hand drawn from the rectified imagery (Fig. 6).
Figure 5.
(a) Digital photograph of part of the front façade of the
Storehouse on Ile de la Passe, Mauritius;
(b) Rectified grayscale image aligned to control points in
AutoCAD.
(c) Front elevation of the Storehouse with rectified photo.
(d) Front elevation of the Storehouse with details digitised from
the rectified photo.
(e) The Storehouse façade reconstructed in Photoshop to
present its earlier appearance when built by the French.
REAR ELEVATION
REAR ELEVATION WITH PHOTO
STRUCTURE 11 - CENTRAL BUILDING ? . ! .. ? -? m
Figure 6. Rear Elevation of the Central Building on Ile de la
Passe, Mauritius.