Add static data layer (not updated from year to year), based on the spatial grid of the map obtained by the get_map() function
References
- Soil features from [SoilGrids](https://soilgrids.org/) - Crop distribution from the Land-Parcel Identification System ([Registre Parcellaire Graphique](https://www.data.gouv.fr/fr/datasets/registre-parcellaire-graphique-rpg-contours-des-parcelles-et-ilots-culturaux-et-leur-groupe-de-cultures-majoritaire/) in France) of the European Common Agricultural Policy - Organic crop distribution from [Agence Bio](https://www.data.gouv.fr/fr/datasets/parcelles-en-agriculture-biologique-ab-declarees-a-la-pac/) - Herd density from [Agreste](https://agreste.agriculture.gouv.fr/agreste-web/) - Human population density from [Global Human Settlement Layer](https://ghsl.jrc.ec.europa.eu/download.php?ds=pop)