{
  "updated": "2026-09-05",
  "terrain": {
    "credit": "Mapzen/Tilezen; SRTM and GMTED2010 courtesy of USGS; ETOPO1 courtesy of NOAA",
    "source": "https://registry.opendata.aws/terrain-tiles/",
    "attribution": "https://github.com/tilezen/joerd/blob/master/docs/attribution.md",
    "grid": "257 by 481, about 100 metres; bilinear sampling of zoom-12 Terrarium tiles",
    "heightExaggeration": 4,
    "limitations": "Smoothed terrain, not a current survey or individual building model. Tile metadata dates from 2017. Ocean bathymetry datum not normalized; only land relief rendered."
  },
  "coastline": {
    "credit": "geoBoundaries, upstream public-domain map",
    "source": "https://www.geoboundaries.org/api/current/gbOpen/LCA/ADM0/",
    "boundaryYear": 2005,
    "limitations": "Cartographic administrative land polygon, not a current surveyed shoreline."
  },
  "places": {
    "credit": "GeoNames, CC BY 4.0; approximate representative camera destinations",
    "source": "https://www.geonames.org/about.html"
  },
  "systemMarkers": "Conceptual locations for reading; do not represent physical facilities or local outcome measurements."
}