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fig11 2W operator's interface (flight planning) 
The set of reference points necessary for this algorithm to 
do calculations is the same one utilised in the part of the 
analysis of the transformations. This software allows 
therefore, for the user to know the actual position of each 
element designed by de’Barbari and to find on his view 
each place in the city as it is today. The limitations of the 
program are that of the algorithm: the correspondence is 
exact on the reference points while for all of the other 
points, it is obtained by interpolation. 
In fact, the geo-referencing is complete. 
The 2W software allows the user to identify corresponding 
points and therefore to calculate the coordinates in the 
system of the reference chart. 
These two actions: 
• identify the points, 
• know the coordinates of these points, 
which are the fundamental operations which are done in 
cartography: 
• localise, 
• measure. 
The software designed and implemented realises in a 
conclusive way the idea of the rigorous metric support 
return to historic cartography without however modifying 
the original aspect. This suggests therefore the need to 
reflect on the possibilities offered by the use of 
informational instruments in the field of cartography, and 
not only historic. 
Bibliography 
Guerra F., Balletti C., Miniutti D., GeoPlanTransf: a 
software for thè georeferencing of digitai images by using 
piane trasformations, in International Archives of 
Photogrammetry and Remote Sensing, ISPRS WG VI/3, 
Parma, 15-19 febbraio 1999. 
Fuse T., Shimizu E. Morichi S., A study on geometrie 
correction of historical maps, in International Archives of 
Photogrammetry and Remote Sensing voi XXXII, Part 5, 
Hakodate 1998; 
Guerra F., Balletti F., Monti C., Livieratos E., Boutoura C., 
Le carta prospettica del De' Barbari (1500): analisi delle 
qualità metriche, in Atti ASITA99, Napoli, 9-12 novembre 
1999. 
Guerra F., Balletti F., Monti C., Livieratos E., Boutoura C., 
Studi ed elaborazioni informatiche e infografiche sulla 
veduta prospettica di de’Barbari, catalogo della Mostra 
“Jacopo de’Barbari.Carte e panorami di città nel ‘500”, 
Museo Correr, Venezia novembre 1999. 
Guerra F., Trasformazioni geometriche locali: 
trasformazione versus corrispondenza, tesi di dottorato in 
Scienze Geodetiche e Topografiche, XII ciclo, Politecnico 
di Milano. Tutor: Carlo Monti