These datasets are excerpts of the reference vector database produced by the French Mapping Agency (https://www.ign.fr/), namely the BDTOPO¨, and corresponding aerial images, namely the BDORTHO¨.

Each dataset represents a French administrative unit (department), at a given valid time. The data are provided in ESRI shapefile format. They are represented using the Lambert 93 coordinates reference system (EPSG:2154). We convert them to PNG images, where each category of objects is color-coded.

The available French administrative units are:
- Moselle
- Bas-Rhin
- Meurthe-et-Moselle 
- C™tes-d'Armor

Each department is represented at the following years:
- 2004
- 2010
- 2014
- 2019

The data are stored as images (img) and vector data (lbl), and the name of each folder corresponds to the  unique name of BDORTHO¨ image.

These data are made available for research purposes only, especially to test the images and graph matching/indexing approaches developed as part on the ALEGORIA project (ANR-17-CE38-0014-01), in particular in the work presented in the following article: 

M. Khokhlova, N. Abadie, V. Gouet-Brunet and L. Chen, Learning embeddings for cross-time geographic areas represented as graphs, In the 36th ACM/SIGAPP Symposium On Applied Computing (SAC 2021) - Technical Track Geographic Information Analysis, 22-26 March 2021, Gwangju, South Korea.

Using them implies:
- complying with the terms of the following license agreement:
https://geoservices.ign.fr/ressources_documentaires/Espace_documentaire/licence_gratuite.pdf
- citing the article mentioned above.

If you have any questions, please contact:
- about the ALEGORIA project: http://alegoria-project.fr/en/contact/contact_us
- about terms of use of IGN data: contact@geoservices.ign.fr