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 "quality_summary": {
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  "interpolation": "bilinear",
  "smoothing": "none",
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  "elevation_crs": "EPSG:27700",
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  "elevation_tiles": [
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  "calculated_at": "2026-08-19T18:26:29+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",
  "elevation_tile_ids": [
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.5% over 200 m (Terrain 50), gain 74.8 m over 588 m way. EXTENDED by graph walk: +2 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.3509, -3.0720)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.3509, -3.0720)'"
 },
 "area": {
  "place": "Tref-y-Clawdd",
  "county": "Powys - Powys"
 }
}