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   "data/cache/wales/dtm_1m/wg_del_22_267298_20220114dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_22_267299_20220114dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_22_268298_20220114dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_22_268299_20220114dtm.tif"
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  "calculated_at": "2026-08-20T23:06:13+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",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
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   "wg_del_22_266299_20220114dtm.tif",
   "wg_del_22_267298_20220114dtm.tif",
   "wg_del_22_267299_20220114dtm.tif",
   "wg_del_22_268298_20220114dtm.tif",
   "wg_del_22_268299_20220114dtm.tif"
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  "elevation_capture_dates": [
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.6% over 200 m (Terrain 50), gain 80.9 m over 1157 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): qualified-steep.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 }
}