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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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  "interpolation": "bilinear",
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   "data/cache/wales/dtm_1m/wg_del_13_325305_20210316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_325306_20210316dtm.tif"
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  "calculated_at": "2026-08-12T09:12:06+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": [
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   "wg_del_13_325305_20210316dtm.tif",
   "wg_del_13_325306_20210316dtm.tif"
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  "elevation_capture_dates": [
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  "climb_origin": "osm_incline",
  "notes": "Promoted automatically from triage verdict=validated. Named from nearest OSM place node (Leighton); originally unnamed at (52.6419, -3.105). EXTENDED by graph walk: +6 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
  "place": "Pentre",
  "county": "Powys - Powys"
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 "reported_claims": [
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   "source_name": "OSM incline tag 20% (editors=1, first tagged 2016-08-21)",
   "value_pct": 20.0,
   "evidence_type": "mapper_estimate",
   "claimed_window_m": null,
   "observed_via": "osm_tag_history",
   "retrieved_at": "2026-08-10T20:21:40Z"
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 ],
 "confidence": "B",
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  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 290.0,
  "shape_class": "sustained"
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}