Crowdsourcing for georeferencing Napoleonic cadastre over a wide area

Abstract

The Napoleonic cadastre is a very rich collection of information concerning land use at the beginning of the 19th century, valid throughout France. Georeferencing this maps requires a specific method that we have formalized, and needs to mobilize an abundant and trained workforce if this task is to be carried out in a reasonable timescale on large areas like a wide department. A process of georeferencing of communal assembly plans involving researchers and students has been ongoing in the Puy-de-Dôme department since 2017. Out of 464 communes, 287 have an accuracy of < 15 m, 154 between 20 and 50 m and only about twenty remain to be completed. The first results permit to better understand how this cadastre has been made, and to characterize the landscape of this contrasted region (mountains, hills, plateaux, sedimentary basin) at this time. Even if the program is still ongoing, this experiment allows us to present some opening perspectives associating researchers and local associations in geo-history, agronomy, archaeology and landscape studies.

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