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  "calculated_at": "2026-08-12T09:12:11+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "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",
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  "elevation_capture_dates": [
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  "notes": "Climbs the north side of Cwm Rheidol from near Aberffrwd \u2014 identified by Peter (previously mislabelled 'Capel Bangor to Pen-y-crug' by nearest-place auto-naming). Peter's local example, confirmed by regional LiDAR sweep: 2.3 km, 233 m gain. 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."
 },
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  "county": "Sir Ceredigion - Ceredigion"
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}