{
  "version": 1,
  "file": "terrain-surface-mask.png",
  "dimensions": [
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    1280
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  "bboxWGS84": [
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  "worldBoundsXZ": [
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  "channels": {
    "r": "Explicit grass/meadow/scrub/wood mapped cover strength",
    "g": "Mapped hard surfaces and road corridors",
    "b": "Mapped bare rock"
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  "counts": {
    "greenPolygons": 119,
    "rockPolygons": 9,
    "pavedPolygons": 19,
    "roadCorridors": 704,
    "excludedBuildingsWaterCemetery": 1336
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  "source": "OpenStreetMap contributors, ODbL 1.0; Overpass API geometry plus existing OSM geometry",
  "sourceQueryFile": "osm-surface-query.txt",
  "osmTimestamp": "2026-09-27T16:16:35Z",
  "licenseURL": "https://www.openstreetmap.org/copyright",
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  "notes": [
    "Park administrative boundaries are never assumed to be grass.",
    "Unknown cover preserves orthophoto.",
    "No terrain geometry, height, coastline, collision, or traversal data is changed.",
    "Road widths use explicit OSM width when present, otherwise match existing rendered corridor widths."
  ]
}