Full text: Surveying and documentation of historic buildings - monuments - sites

182 
Maestri, Canciani, Spadafora 
max 
min 
avg 
PHOTO 
48 
POINTS PER PHOTO 
8 
28 
18 
TOTAL POINTS 
502 
PHOTO COVERAGE (%area) 
23 
80 
50 
CONTROL POINTS 
169 
FIDUCIALS PER PHOTO (%) 
n/a 
n/a 
n/a 
REGULAR POINTS 
4 
SURFACE POINTS 
329 
RAYS PER 3D POINT 
1 
6 
4 
POINTS ON ONE 
PHOTO ONLY 
number 
% 
ANGLE INTERSECTION 
0 
89 
63 
0 
0 
RAY TIGHTNESS (% of size) 
0 
2 
0 
POINTS ON TWO 
PHOTOS ONLY 
2 
1 
APPROXIMATION MAX 
0.488 
Fig. 12: Summary table of the survey data relating to east façade Fig. 13: Viewpoints of the photographic shooting 
of cryptoporticus in the Casa dell’Ancora 
Fig. 14: Indication of the rectangular support surface Fig. 15: Indication of the surfaces of the arcades 
and of the surface points and some surface points 
This software required the orientation of the photograms on the basis of the 3D points detectable on the photographs thanks to 
the coloured markers. The final model is given up by 181 lines, 169 control points and 329 surface points. The plane of each 
arcade was built subtracting it by a rectangular support surface, referenced with 4 control points shot in 2 photograms at least. 
The curve of the arcade was traced on the support surface, through a set of surface points (points belonging to the surface that do 
not need the reference process). Subsequently, the arcade defined by the perimeter of the control and surface points was built. 
The rectangular support surface was afterwards erased in the 3D modeller software 3DS Max 3.1, used for the final rendering of 
the images. 
e) The model was several times elaborated in order to reduce the admissible deviation at a level lower than 2% through the hand 
correction of the data resulting with a not acceptable approximation. The schematic settings of the model produce an error of 
about 5 cm on the entire size, that is acceptable in consideration of the preliminary statements. 
f) Then the base model was enriched with further details through the use of photographs so as to become measurable in every part. 
For instance, we can measure the bricks or the stones directly in 3D model. A subsequent elaboration with a specific rendering 
software (in this case 3DS Max 3.1) allowed to obtain a set of images such as the façade in orthogonal projection. 
Fig. 16: East façade detail. Elaboration trough more accurate graphic model
	        
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