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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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  "calculated_at": "2026-08-13T02:13:08+00:00",
  "road_source": "wales-discovered-adopted-routes/hillside.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_7_307382_20210211dtm.tif"
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  "elevation_capture_dates": [
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  "route_summit_trim_m": 636.3,
  "route_summit_trim_loss_m": 21.6,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 21.7% over 200 m (Terrain 50), gain 105.1 m over 1373 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 (notable slice 2026-08-11): clean-steep."
 },
 "confidence": "A"
}