The file "centralpark.geojson" was derived from the file downloaded from
<https://data.cityofnewyork.us/Education/2017-2018-School-Zones/ghq4-ydq4>
(last checked 2022-04-17).
The file "hydepark.geojson" was derived from the file downloaded from
<https://opendata-historicengland.hub.arcgis.com/datasets/historicengland::national-heritage-list-for-england-nhle/explore?layer=7>
(last checked 2024-04-02).
The file "luxembourg.geojson" was derived from the file downloaded from
<https://download.data.public.lu/resources/limites-administratives-du-grand-duche-de-luxembourg/20180806-153458/communes4326.geojson>
(last checked 2021-08-08).
The file "vincennes.geojson" was derived from the file downloaded from
<https://opendata.paris.fr/api/explore/v2.1/catalog/datasets/espaces_verts/exports/geojson>
(last checked 2023-10-26).
