Geography Reference
In-Depth Information
Figure 12. Visible seams in F and L maps, due to the assemblage of single sheets on the canvas: the
homologue tracts of the drawing do not always fit exactly together.
As what we can see today is the product of the long lifespan of the maps, a fundamental
question arises concerning type, number and entity of the restorations performed on them.
Each restoration probably slightly changed the map almost imperceptibly. This may be true
also for the smallest details, and it could partially deny the possibility of performing a
correct diachronic study of the original document.
5. A discussion and a proposal
Notwithstanding some still open questions, the whole set of the discussed details highlights
a very interesting class of information related to the hidden steps of pre-geodetic map
construction. In particular, these details highlight the presence in the map of areas surveyed
by means of different methodologies. This fact can explain the different entity of
georeferencing residuals characterising different areas as well as the presence of high
deformations in some particular areas rather than in others. The use of different survey
methodologies can be due to various reasons, such as different levels of interest in the
representation of different zones (e.g. areas confiscated by the Venice government, or areas
planned for the forthcoming Po river diversion), or difficulties in surveying some others
(e.g. areas too far from a selected reference baseline, or without well-recognizable
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