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Title
New perspectives to save cultural heritage
Author
Altan, M. Orhan

CIPA 2003 XIX th International Symposium, 30 September - 04 October, 2003, Antalya, Turkey
plied, the DM and the IM-ac/d. For the better visual perception
of the differences, the overlay of an orthogonal equidistant grid
was applied on the IM-ac/d map detail as in Figure 4.
Figure 4. The grid overlay on the image of Figure 3.
Finally, the gridded df is now optimally fitted to the df as in
Figure 2, applying a fifth-degree polynomial. The transformed
df is depicted in Figure 5.
r + f r X + + f + Jy +
-t- ^
4- -\-^Æ '\x ; 4
4-
4“
--ÎÆ& -IS*
. | r*>
X!*n>ni
J2 . *
4
■+■
f 4
k
*4 4
4-
4
4 1®
4
-<,**,&*
4 4
4 4
4-
4
4 4
-f
4 4
4 4
4 '
Figure 5. The best fitted IM-ac/d image to the DM initial image
applying a fifth-degree polynomial.
The image in Figure 5 summarises the surface differences in
duced by the two modes of image acquisition the DM and the
IM-ac/d. Here, all possible types of distortions due to the parti
cular modes used are included in a global sense. Knowing the
dimensions of the original map it is possible to compute linear,
angular and areal deformations induced by the acquisition
modes. Studying these deformations one could arrive in some
indeed significant results, which will contribute in the develop
ment of the intended protocols concerning the LCOR concept
as mentioned in the paragraph 5.3.
The real challenge here is to develop a model or the identifi
cation and the classification of the distortions.
7. CONCLUDING REMARKS
In this paper we have introduced the idea to combine digital
photogrammetry and digital cartography with modem research
in historical cartography. In this procedure, scanning of old
maps, i.e. the acquisition of relevant dfs, is of vital importance
since the overall scheme is operating totally in digital domain.
A special flowchart has been designed for the implementation
of the idea and two research by-products are formulated:
■ The articulation of a protocol for a Low Cost with an
Optimal Response digitalisation of old maps for the
introduction of cartographic heritage in the digital
era.
■ The strengthening of the research on the analysis of
the geometric and projective properties of old maps
by using digital analyses and interpretations.
In paragraph 6 a general example illustrated the second by-pro
duct of the proposed scheme. For the shake of the example we
presented the image of the global differences (Figure 5)
between the df derived by the DM and the counterpart derived
by the IM-ac/d after some reasonable initial corrections in
fitting the dfs preserving the conformality of the images (Figu
res 2, 3). Of course the advancement should be the meticulous
analysis of the contributing distortions either by identifying the
sources for this or by studying the effects in a phenomenolo
gical manner applying e.g. deformation analyses (Boutoura and
Livieratos, 1986). Both cases, as well as issues related to the
first by-product as stated above, are subject of on-going re
search.
References
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