These graph datasets are derived from excerpts of the reference vector database produced by the French Mapping Agency (https://www.ign.fr/), namely the BDTOPO¨.

Each graph represents the geographic entities located in a bounding box of 200 m on each side, centered on a given point of interest, and theirs spatial relationships.

The graphs are built for BBOX located in the following French administrative units:
- Moselle
- Bas-Rhin
- Meurthe-et-Moselle 
- C™tes-d'Armor

A distinct graph is built for each POI-centered BBOX, and for the following years:
- 2004
- 2010
- 2014
- 2019

More information on the graph creation process in provided 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.

These data are made available for research purposes only, especially to test the images and graph matching/indexing approaches as those of the ALEGORIA project (ANR-17-CE38-0014-01) for which they were created. 

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