translate English to French: Accordingly, the information collected on nearly 3.000 houses in the town of Cognac, which has a total of approximately 7.500 dwellings, was subjected to counts, sortings and correlation calculations which proved highly enlightening to 'the investigators, especially as it was possible for certain features considered particularly significant to be mapped automatically in various ways, enabling the most interesting phenomena to be visualised.
A l'issue des campagnes de prises de vues qui accompagnent ces enquêtes, ou bien lorsque le service acquiert un fond photographique ancien, chaque phototype est immatriculé, identifié, légende et toutes les informations se rapportant à lui sont saisies sur une base de données appelée PHOTO.