{
 "@context": "https://schema.org",
 "@type": "Dataset",
 "name": "Inside the Rock - Gibraltar in 3D",
 "description": "Georeferenced 3D data for Gibraltar: terrain, buildings, tunnel centrelines, underground sites and heritage structures, each tagged with the source of its position and elevation.",
 "url": "https://gibraltarmap.gaborszabopoker.com/",
 "license": "https://opendatacommons.org/licenses/odbl/1-0/",
 "isAccessibleForFree": true,
 "creator": {
  "@type": "Person",
  "name": "Gabor Szabo",
  "url": "https://gaborszabopoker.com"
 },
 "spatialCoverage": {
  "@type": "Place",
  "name": "Gibraltar",
  "geo": {
   "@type": "GeoShape",
   "box": "36.102259 -5.373942 36.159219 -5.318973"
  }
 },
 "keywords": [
  "Gibraltar",
  "tunnels",
  "Great Siege Tunnels",
  "WWII tunnels",
  "fortifications",
  "batteries",
  "heritage",
  "3D map",
  "LiDAR",
  "EPSG:25830"
 ],
 "distribution": [
  {
   "@type": "DataDownload",
   "name": "Features (tunnels, sites, structures)",
   "encodingFormat": "application/json",
   "contentUrl": "https://gibraltarmap.gaborszabopoker.com/data/features.json"
  },
  {
   "@type": "DataDownload",
   "name": "Named places",
   "encodingFormat": "application/json",
   "contentUrl": "https://gibraltarmap.gaborszabopoker.com/data/labels.json"
  },
  {
   "@type": "DataDownload",
   "name": "Georeferencing metadata",
   "encodingFormat": "application/json",
   "contentUrl": "https://gibraltarmap.gaborszabopoker.com/data/meta.json"
  }
 ],
 "sources": [
  {
   "name": "HM Government of Gibraltar geoportal",
   "url": "https://www.geoportal.gov.gi/",
   "provides": "2 m terrain model, 2013 aerial imagery, 13,538 building footprints"
  },
  {
   "name": "Spanish IGN PNOA-LiDAR",
   "url": "https://pnoa.ign.es/",
   "licence": "CC BY 4.0 scne.es",
   "provides": "elevation, merged with the Gibraltar model"
  },
  {
   "name": "OpenStreetMap",
   "url": "https://www.openstreetmap.org/",
   "licence": "ODbL",
   "provides": "mapped tunnel centrelines"
  },
  {
   "name": "HMGoG Heritage & Antiquities Act register",
   "url": "https://www.ministryforheritage.gi/",
   "provides": "listed heritage sites and memorials"
  },
  {
   "name": "defenceofgibraltar.com via the Internet Archive",
   "url": "https://web.archive.org/web/*/defenceofgibraltar.com",
   "provides": "634 documented defence works"
  }
 ],
 "elevationProvenance": {
  "portal": "Estimated. Straight grade between the two portal elevations read off the DEM, pushed down only where it would otherwise break out through the surface. Not a survey.",
  "portal-capped": "Estimated. The ground heights at the two ends of the mapped line imply a gradient steeper than any road tunnel, which means the upper end is a point inside the rock, not a portal. The bore is held within 1 in 10 of its lower portal instead. Not a survey.",
  "level": "Sourced level above sea datum, from the cited document.",
  "surface": "Position only. The depth of this site is not in any open source, so it is drawn at the surface point we do know rather than guessed at."
 },
 "honestLimits": [
  "About 12 percent of Gibraltar's roughly 55 km tunnel network is represented, because that is what exists in open data.",
  "Depths are the weak point, not positions. Most tunnel elevations are estimated from portal heights; the zsrc field on every feature says which case applies.",
  "Located underground sites are drawn at the recorded surface point, not at a guessed depth."
 ]
}