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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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  "interpolation": "bilinear",
  "smoothing": "none",
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  "elevation_crs": "EPSG:27700",
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   "data/cache/wales/dtm_1m/wg_del_13_316308_20210316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_316309_20210316dtm.tif"
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  "calculated_at": "2026-08-13T02:11:46+00:00",
  "road_source": "wales-discovered-adopted-routes/discovered-lane-52-6701-3-2375.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_13_316308_20210316dtm.tif",
   "wg_del_13_316309_20210316dtm.tif"
  ],
  "elevation_capture_dates": [
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  "route_summit_trim_m": 333.7,
  "route_summit_trim_loss_m": 23.1,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.7% over 200 m (Terrain 50), gain 25.6 m over 706 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. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-52-6643-3-2362 ADOPTED (notable slice 2026-08-11): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.6701, -3.2375)'."
 },
 "confidence": "B"
}