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. 
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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.