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  "calculated_at": "2026-08-13T02:09:16+00:00",
  "road_source": "extended-proposals-wales-routes/unnamed-lane-near-pen-y-garn.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",
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   "wg_del_22_266277_20220114dtm.tif",
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   "wg_del_23_265276_20220117dtm.tif",
   "wg_del_23_265277_20220117dtm.tif",
   "wg_del_23_265278_20220117dtm.tif"
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  "notes": "Second in Rheidol sweep by max 100 m (22.5%); no incline tag. EXTENDED by graph walk: +2 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). RENAMED 2026-08-11 (Peter approved): auto-name \"Unnamed lane near Pen-y-garn\" was a phantom \u2014 no Pen-y-garn within 13 km in OSM (nodes AND ways), OS Open Names, or the RCAHMW historic place-name index; nearest is the 610 m summit near Devil's Bridge (SOTA GW/MW-004), 13.8 km east. Endpoints verify: Llanfihangel-y- Creuddyn and Pant-y-crug both within metres of the route ends."
 },
 "confidence": "B"
}