The COMMUNES project, founded by the French Agency for national Research (ANR), is creating the first historical-GIS capturing all changes in the boundaries of French communes since the Revolution, linked to population data and combined with a multi-modal dataset of transport networks from mid-18th century to the present.
This collaborative project ...
(Show more)The COMMUNES project, founded by the French Agency for national Research (ANR), is creating the first historical-GIS capturing all changes in the boundaries of French communes since the Revolution, linked to population data and combined with a multi-modal dataset of transport networks from mid-18th century to the present.
This collaborative project has five main objectives, which the communication will develop and illustrate with some results for each of them:
- Creating the first H-GIS of municipal boundaries for the whole of France over the last two hundred years (1790 to the present).
The methodology, inspired by the “England and Wales parish and place GIS”, is adapted to French sources and their diversity (historical maps like, Cartes d’État-Major and cadastral maps, but also archival records giving topographic descriptions of the boundaries). About 45 000 communes, existing or having existed from 1790 to the present, are considered in this infrastructure. Reconstructing, year by year, the territorial influence of the municipalities allows us to also reconstitute the upper administrative levels.
- Linking Ancien Régime parishes to 1790s communes, in order to get a spatial continuity beyond the administrative rupture induced by the Revolution.
We use Eric Brian’s compilation of parish listings from the Enquête La Michaudière (mid-1780s) and complementary data we have collected in the archives, which are linked to spatial data (Cassini maps or ancien administrative division). We have developed an algorithmic and geospatial method to match the communes we are recreating for 1790 to the Ancien Régime parishes.
- Adding to this H_GIS, the cartographic reconstruction of road, river and rail routes for the entire period and developing a multi-modal of transport networks, 1750 to the present.
The methodology is based on the experience previously acquired on the reconstruction of the French rail network. We use it to reconstruct the waterways network on the basis of maps, websites, primary and secondary sources.
This will give us homogeneous and comparable data on accessibility in the long run, and greatly help our understanding of the morphogenesis of the transportation network in France and of the impact of these innovations on territories. Using a multimodal graph analysis allows us to model and measure real-life accessibility (travel time, distance) between any points of the national territory.
- This geospatial infrastructure makes possible to link any data (social, economic, demographic, cultural, etc.), associated to an administrative entity, with the exact historical municipalities. A finer and systematic understanding of the relationship between statistical data and the ancient administrative units that were used to produce them, is a necessary pre-requisite for all socio-economic and demographic studies.
- At least but not last, all our data will be available to the whole community, freely and as widely as possible (following FAIR principles).
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