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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.",
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   "data/cache/wales/dtm_1m/wg_del_20_274210_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_275210_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_21_273211_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_21_274211_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_21_275211_20220112dtm.tif"
  ],
  "calculated_at": "2026-08-20T23:06:15+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_20_274210_20220112dtm.tif",
   "wg_del_20_275210_20220112dtm.tif",
   "wg_del_21_273211_20220112dtm.tif",
   "wg_del_21_274211_20220112dtm.tif",
   "wg_del_21_275211_20220112dtm.tif"
  ],
  "elevation_capture_dates": [
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.0% over 200 m (Terrain 50), gain 37.5 m over 583 m way. EXTENDED by graph walk: +2 segment(s) at base, +6 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): pen-y-rhiw ROAD-REVIEW: way 361610953: unnamed service way; way 361610953: service way, surface untagged; way 462605380: unnamed service way; way 462605380: service way, surface untagged ADOPTED (notable slice 2026-08-11): clean-steep.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 }
}