Experiences on georeferencing of maps from the XIX century Gregorian Cadastre of Bologna (Italy).

Abstract

The study focuses on the nineteenth century Gregorian Cadastre of Bologna, kept today at the\nState Archive of the city. In these maps the city is divided into several sectors; for each sector\nthere are ground floor maps and maps for the floors above and below.\nIn the study, results from metric analysis of these maps are reported. The analysis consists in\na preliminary georeferencing of digital images derived from high quality scanning of the\noriginal documents, together with an assessment of map deformation. Moreover, digital mosaics\nfrom each floor were sequentially superimposed. Finally, a comparison with the original\nedition map kept at the State Archive of Rome was performed, in order to highlight possible\ndifferences between the two editions and digitally restore the worn maps of the Bologna edition.