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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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 "provenance": {
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  "elevation_tiles": [
   "data/cache/wales/dtm_1m/wg_del_27_250265_20220305dtm.tif"
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  "calculated_at": "2026-08-12T23:12:25+00:00",
  "road_source": "trunk-adopted-routes/discovered-lane-52-2654-4-1951.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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  "elevation_capture_dates": [
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.6% over 200 m (Terrain 50), gain 38.1 m over 384 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.2654, -4.1951)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.2654, -4.1951)'"
 },
 "area": {
  "place": "Graig Ddu",
  "county": "Sir Ceredigion - Ceredigion"
 },
 "reported_claims": [],
 "confidence": "A"
}