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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.",
 "quality_summary": {
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  "extent": [
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 },
 "provenance": {
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  "interpolation": "bilinear",
  "smoothing": "none",
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  "elevation_crs": "EPSG:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/wales/dtm_1m/wg_del_31_332190_20220403dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_5_332191_20201201dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:11:51+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
   "wg_del_31_332190_20220403dtm.tif",
   "wg_del_5_332191_20201201dtm.tif"
  ],
  "elevation_capture_dates": [
   "01-12-2020",
   "03-04-2022"
  ],
  "climb_origin": "osm_incline",
  "notes": "Measured max 5 m 14.9% vs tagged 40% \u2014 the tag, not the terrain, is wrong. Keep as the canonical example of why OSM incline tags need provenance checks before being treated as sign observations. EXTENDED by graph walk: +0 segment(s) at base, +4 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
  "place": "Pilton Vale",
  "county": "Casnewydd - Newport"
 },
 "reported_claims": [
  {
   "source_name": "OSM incline tag (bulk changeset)",
   "value_pct": 40,
   "evidence_type": "mapper_estimate",
   "claimed_window_m": null,
   "observation_date": "2021-10-04",
   "retrieved_at": "2026-08-10",
   "credibility": "Weak: changeset 112097443, one user tagged 44 inclines across one Caerleon estate in one edit, source 'local knowledge'; no evidence of physical sign"
  }
 ],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.319,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 350.0,
  "shape_class": "sustained"
 }
}