{
  "provider": "IGN — Géoplateforme / cartes.gouv.fr",
  "layer": "ORTHOIMAGERY.ORTHOPHOTOS",
  "wmts_template": "https://data.geopf.fr/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetTile&LAYER=ORTHOIMAGERY.ORTHOPHOTOS&STYLE=normal&FORMAT=image/jpeg&TILEMATRIXSET=PM_0_19&TILEMATRIX={z}&TILECOL={x}&TILEROW={y}",
  "tile_matrix_set": "PM_0_19",
  "projection": "EPSG:3857",
  "tile_size": 256,
  "max_zoom": 19,
  "license": "Licence Ouverte / Open Licence 2.0",
  "license_url": "https://www.etalab.gouv.fr/licence-ouverte-open-licence/",
  "dataset": "https://cartes.gouv.fr/rechercher-une-donnee/dataset/IGNF_BD-ORTHO",
  "acquisition_dates": "https://data.geopf.fr/annexes/ressources/fiches/photographies-aeriennes-RVB/geoportail_dates_des_prises_de_vues_aeriennes-RVB.pdf",
  "verified_at": "2026-09-13T19:26:04.801Z",
  "local_template": "./data/imagery/ign/{z}/{x}/{y}.jpg",
  "delivery": "IGN is requested first by the browser. On failure or after 2500 ms, the saved same-origin JPEG is used silently. Originals remain permanently with the project. The Node server acquires missing originals once; successful IGN images are not served a second time to visitors. Static hosting provides fallback for the preloaded coverage.",
  "roof_projection": "Georeferenced aerial photos projected on flat roof polygons triangulated from OSM, clipped at WMTS tile boundaries. Original courtyard holes retained. No facade photography or measured roof shapes.",
  "sample": {
    "zoom": 17,
    "x": 67124,
    "y": 45037,
    "local": true
  }
}