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 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
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  "review": [
   "human_review: Line-offset campaign 2026-08-20: after re-siting to the Open Roads centreline, ranked max10 33.7% still sits 11.7 m from any OR link (OSM and OR disagree where the road is) \u2014 quarantined pending adjudication."
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  "calculated_at": "2026-08-20T22:42:54+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.6% over 200 m (Terrain 50), gain 51.3 m over 479 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. DEDUPE: absorbed 3 overlapping proposal(s): discovered-lane-51-1954-3-5899, discovered-lane-51-2021-3-5896, discovered-lane-51-2041-3-5807 ADOPTED (England launch slice 2026-08-16): clean-steep,endurance.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Porlock",
  "county": "Somerset"
 }
}