It is common practise to select
the method of documentation of historic buildings, tools and other resources
necessary for the project based on
- Purpose of the Survey
- Contextual factors and complexity of the historic building
- Time and Cost factors
- Technical know-how of the working team
In this project, however, the
deliverables are fixed i.e. Hand survey documents for four monuments within a
fixed time and cost. The clients are still unsure about the purpose of the
survey and have left it on the consultants to arrive at a suitable method and
output.
As mentioned in a previous
section, documentation of historic buildings was only carried out prior to
civil works to aid in forming estimates of work. Although in the last few
decades, more and more documentation works have been carried out to aid conservation
works; rarely has it been used for the same and more and more documents have
ended up in the archives.
It remains a huge challenge for
the consultants to choose the right method and deliver a product that meets the
Purpose of the survey; also overcoming the various constraints on site.
This section is an attempt to discuss
the methods of documentation that are being conducted.
Hand Survey methods
The consultants are documenting
the plan of the historic building using
- Triangulation; to arrive at an overall profile
- Chain and offset method for the details
Photo-rectification
The clients, lacking the
technical knowledge of documentation over looked the provision of scaffolding
and other such necessary supports and since height of the structure remains a
constraint (6ft to 11ft), the consultants had to resort to photo rectification
in order to document the exterior and interior elevations. Adding to this is
the fact that the site is struck by monsoons for most of the project period due
to which outdoor works becomes close to impossible. The number of working hands
being limited, photo rectification seemed to be the most suitable option in
this case. The facades are more or less flat and are less complex which would
help reduce errors in the rectified photograph. In cases where the room width is too narrow
for photography, the consultants prepare a photo mosaic which is tested for
accuracy by actual measurements.
The photographs taken are being rectified
using Adobe Photoshop CS4 by correcting the lens distortion.