{
  "title": "Trondheim Spektrum surroundings — OpenStreetMap geographic extract",
  "sourceUrl": "https://api.openstreetmap.org/api/0.6/map?bbox=10.360,63.420,10.394,63.435",
  "sourceBbox": [
    10.36,
    63.42,
    10.394,
    63.435
  ],
  "retrieved": "2026-11-03",
  "copyright": "© OpenStreetMap contributors",
  "license": "Open Database License (ODbL) 1.0",
  "licenseUrl": "https://www.openstreetmap.org/copyright",
  "origin": {
    "lat": 63.42754,
    "lon": 10.37638
  },
  "conversion": {
    "x": "(longitude - 10.37638) * 49796.69196176017",
    "z": "(63.42754 - latitude) * 111320"
  },
  "counts": {
    "buildings": 2098,
    "roads": 662,
    "paths": 1052,
    "railways": 123,
    "water": 9,
    "green": 457,
    "pitches": 18,
    "areas": 282,
    "trees": 1424,
    "points": 239
  },
  "processing": "OSM XML geometry converted to local metre coordinates. Multipolygon rings assembled by shared node IDs. Closed polygons clipped to ±850 m. Roads/paths collinear points simplified with 0.15m tolerance. OSM source tags retained. Unclosed/incomplete relations outside extract omitted. Exception: Nidelva way/15804785 uses the complete real OSM riverbank ring for the distant water context; the original city-detail extent and all other features are unchanged.",
  "issues": [
    "relation/1441661: incomplete outside source bbox; omitted",
    "relation/1441678: incomplete outside source bbox; omitted",
    "relation/1573728: incomplete outside source bbox; omitted",
    "relation/12929529: incomplete outside source bbox; omitted",
    "relation/20811405: incomplete outside source bbox; omitted"
  ],
  "waterContext": {
    "feature": "way/15804785",
    "sourceUrl": "https://api.openstreetmap.org/api/0.6/way/15804785/full",
    "retrieved": "2026-11-03",
    "osmVersion": 47,
    "osmTimestamp": "2026-07-09T16:44:47Z",
    "method": "Project all referenced OSM nodes with the existing local conversion and round coordinates to 0.01 m. Retain the full closed ring without clipping, smoothing or extrapolation. The visible context ends in world-space haze.",
    "pointsIncludingClosure": 263,
    "boundsMetres": [
      -245.65,
      -196.97,
      1321.83,
      1217.26
    ],
    "cityDetailExtentMetres": [
      -850,
      -850,
      850,
      850
    ],
    "verification": "Re-clipping the rounded full ring to the original ±850 m bounds reproduces all 140 original non-duplicated ring vertices in identical cyclic order. All 136 original interior vertices match exactly. Other feature geometries and counts are unchanged.",
    "terminalCrossSections": [
      [
        [
          471.45,
          1114.75
        ],
        [
          396.35,
          1217.26
        ]
      ],
      [
        [
          1229.18,
          -104.69
        ],
        [
          1290.11,
          -96.57
        ]
      ]
    ]
  }
}