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figurel. Creta in the Isolario of Benedetto Bordone (1628). The map has been georeferenced to an actual map using a helmert
transformation and then a local point based transformation
This type of algorithms has the advantage of allowing for an optimal adaptation of the image to modify with respect to
the points of reference. The usable parameters allow for an exact transformation for the points known and an
approximate transformation for all the others. All of the points are utilized and so it is impossible to verify the result of
the operations.
In simple words, a local transformation offers the possibility to transfer the reference map geometry to that one that has
to be transformed.
In a finite elements transformation the image to be geometrically correct is divided in a triangular mesh starting from
the control points (the algorithm is that one of the Delaunay triangulation, adopted because of the smaller angle
variations of the resulting triangles). For each triangle, which vertices correspond to three control points, an affine
transformation is applied.
figure3.
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the city :
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figure2. Delunay triangulation in finite element transformation to evalu:
Superim
finite ele
For the analytical and quantitative methods described above, some privileged experimental typology of maps have been produce
identified: the proje
In an an
e perspective maps; mappin
e portolans or sea charts; From à
e isolari. elaborati
central p
32 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
