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  "calculated_at": "2026-08-14T23:11:05+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
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  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
  "elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
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  "notes": "Coarse pass: max 17.0% over 200 m (Terrain 50), gain 37.5 m over 223 m way. EXTENDED by graph walk: +1 segment(s) at base, +5 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
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  "county": "Cornwall"
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}