C1PA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey 
683 
conservation 
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4.3 Selection of documentation techniques and methods 
The foundation for the precision of the documentation was a 
building survey using a total station. This ensured that all of the 
documentation fell within the specified precision of +/-50mm. 
Every element of the deliverable used the survey, therefore the 
entire record shares the same coordinate system. 
Many of the survey points served a dual purpose for the roof 
and floor plans and also in the production of the sections, thus 
reducing the number of points captured on site to around 2500 
(Fig. 4). Due to the large number of survey points, it was 
essential that each point have a clear description to allow 
heritage recording office staff to have access to, and a general 
understanding of, the survey. 
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Fig. 4: Isometric of survey 
Since the strategic nature of a fort is to have unobstructed views 
of the surrounding topography, very few natural obstructions to 
the exterior elevations existed. This, along with other factors 
such as the flatness of the various elevations, consistent photo 
acquisition, lack of obstructions, and easy access, led to the 
decision to use photo rectification. In addition, the elevations 
were relatively long flat areas (some walls as long as 65meters). 
Combine these various factors with the increased resolution of 
digital cameras, and the mortar joints, for example, read quite 
visibly. These factors benefited the heritage recording due to the 
fact that elements such as the mortar joints were identified as 
key information to the record by various users. Control for the 
photographs was obtained from the survey point database. The 
photographs were captured with a digital camera and rectified 
using Rolleimetric MSR software. After the rectification and 
mosaicing of the building planes, the mortar joints were then 
overlaid in AutoCAD. 
Hand recording was the method of choice for the production of 
the floor plans and sections. This method provided a field 
drawing of each room, complete with notes and dimensions, 
which could be transferred to Cad by heritage recording cad 
specialists located in Heritage Conservation Services office in 
Ottawa. Field notes were sent to the office during the site work 
period with some floor plans being drawn before the 
completion of fieldwork. This enabled office staff to identify 
trends regarding errors in the field notes such as missing 
dimensions or notes. 
Walls, windows, doors, loopholes and permanently fixed 
objects were recorded. Rooms were tied together into floor 
plans with the survey using the windows, doors and loopholes 
openings. Several digital photos were taken of each room to 
give office staff a better understanding of individual rooms. 
Building sections were assembled with a combination of hand 
recording, survey and rectified photography. 
The total station was the primary tool for the production of the 
roof plan. Various roof levels, stairs, outlines and all other 
permanent features were located using the total station. The 
primary reasons this method was chosen was because of the 
lack of obstructions between the survey instrument and rod- 
man and with the complex geometry of the buildings, this 
method would be more efficient than hand recording.