Catalogação do acervo histórico de fotografias aéreas da Diretoria de Geociências do Instituto Brasileiro de Geografia e Estatística

The Brazilian Institute of Geography and Statistics – IBGE has a vast historical collection of analog aerial photography, stored in Rio de Janeiro. These photos were the main resources for various cartographic products published by the institution, mostly consisted of topographic maps at various scales. To facilitate searching and accessing this historical data and also to preserve paper information, once it tends to deteriorate over time, we’ve started cataloging information from old schemes which contain the approximate perspective center of the aerial photos. The first step consisted in scanning the original schemes. This was a critical step, considering that in some cases the degradation stage of paper was already evident. The second step was the georeferencing process (through the geographical coordinates collected in the schemes/topographic maps) followed by approximate perspective center extraction of each photo. So far there were collected 63,577 points spread across 190 old schemes and 178 topographic maps, with the attributes: photo, flight range and work block numbers. The subsequent planned stages are: i) collect the perspective center of other photos using the same methodological process; ii) survey and fill the attribute table with others flights information (date, scale, etc.); iii) scanning process of further analogue photographs; and iv) proceed automatic registration workflow of the scanned aerial photos.