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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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  "review": [
   "human_review: T50-divergence wave 2026-08-20 (Peter's go): ranked max25 20.7% reads 4.8% in OS Terrain 50 over the same span (gap 15.9 pp) with canopy corroboration \u2014 short-window value is suspect (Middlewood class). Quarantined pending adjudication."
  ],
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 },
 "provenance": {
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  "interpolation": "bilinear",
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  "elevation_crs": "EPSG:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
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   "data/cache/wales/dtm_1m/wg_del_13_316285_20210316dtm.tif"
  ],
  "calculated_at": "2026-08-20T23:39:46+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_13_316284_20210316dtm.tif",
   "wg_del_13_316285_20210316dtm.tif"
  ],
  "elevation_capture_dates": [
   "17-03-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.3% over 200 m (Terrain 50), gain 27.8 m over 314 m way. EXTENDED by graph walk: +1 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ROAD-REVIEW: way 1067603075: unnamed service way; way 1067603075: service way, surface untagged ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.4562, -3.2315)'.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 }
}