For these reasons, we started a large project to collaboratively digitize several maps of the city of Paris and of France from the 18th century to the 20th century. The digitization of historical sources is usually done locally by researchers for the immediate needs of their research without sharing their work and results with others. We believe it is essential to build a shared platform not only to work together but also to have a collective control over the production process of the data, their transformations and their analysis. Operations such as scanning, georeferencing and digitization of historical sources imply several and delicate choices. These choices should be documentated and tracked.
Reducing the deformations of historical sources during georeferencing usually implies geometric displacements between consecutive maps. Our approach consists in taking theses displacements into account after the digitization process using data conflation / matching tools. Such tools should allow researchers to control and take into account the imperfections of the data throughout their analysis. Furthermore, opendata and open source tools provide the scientific community with the ability to control, track and reproduce the results at every stage.
The code for this website is Open source and available on GitHub. It is based on the amazing BootLeaf Template available on GitHub.
The data provided on this site is licensed under the Creative Commons Attribution 2.0.
Initial Sheet data courtesy of WWF/INRA, see Valauri et al. 2012.
The data present here have been modified by the GeoHistoricalData projet.
Land Use data (cities, domains, etc.) have be entirely digitized by the GeoHistoricalData projet.
Road data (main, secondary and forest roads, paths, bridges, ferries, etc) have be entirely digitized by the GeoHistoricalData projet.
Linear Hydrography data have be entirely digitized by the GeoHistoricalData projet.
Areal Hydrography data (rivers, lakes, ponds, etc.) have be entirely digitized by the GeoHistoricalData projet.