The technological innovations and the progress in using digital images allow the follow-up of new ways in cartographic analyses, comparisons and studies. It is thus possible and interesting to compare various products which contribute into the study of a manifold of territorial representations such as maps, historical maps, orthophotos, aerial photographs, digital terrain models, 3-d models (dtm + orthophotos), perspective images of e.g., cities, coasts, profiles, etc. Partcularly the questions to resolve are: to resoup the metrical content oh historical cartographic heritage; to put points of different typology of maps representing the same place in touch, p.e. a plan with a facade representation. To realize this correspondence its necessary to resort to geometric transformations, which are implemented in Bi-visual, the visualizing-cartography software presented in this paper that is characterized by an interface in which, through an one-to-one correspondence, two digital images of different type, but of the same area, are put in relation. Bi-Visual was tested with applications on cartographies of various place as the cities of Mantova, Thessaloniki, and the coast of Levanto, a seeplace near La Spezia.
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