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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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 "provenance": {
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  "elevation_crs": "EPSG:27700",
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   "data/cache/wales/dtm_1m/wg_del_17_270348_20210330dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_269346_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_269347_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_270346_20220111dtm.tif",
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  "calculated_at": "2026-08-12T23:12:05+00:00",
  "road_source": "trunk-adopted-routes/discovered-lane-53-0055-3-9425.geojson",
  "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_17_270348_20210330dtm.tif",
   "wg_del_20_269346_20220111dtm.tif",
   "wg_del_20_269347_20220111dtm.tif",
   "wg_del_20_270346_20220111dtm.tif",
   "wg_del_20_270347_20220111dtm.tif"
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  "elevation_capture_dates": [
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   "30-03-2021"
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.7% over 200 m (Terrain 50), gain 52.5 m over 517 m way. EXTENDED by graph walk: +0 segment(s) at base, +8 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (window-flag adjudication, Peter's Street View verdict 2026-08-12): long steady grade, no crossing structures \u2014 the 2-25 m window flags are DTM artifacts on a real climb; see road-review-verdicts.yaml. NAMED by human review. Absorbs discovered-lane-53-0154-3-9441 (95% route containment) and twin seed discovered-lane-53-0105-3-9451 (identical chain)."
 },
 "area": {
  "place": "Tal-y-waenydd",
  "county": "Gwynedd - Gwynedd"
 },
 "reported_claims": [],
 "confidence": "U"
}