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 "diagnostic_note": "Windows <=3 m are at raster-noise scale (roughly +/-2 pp on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
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   "data/cache/wales/dtm_1m/wg_del_8_330366_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_330367_20210222dtm.tif"
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  "calculated_at": "2026-08-12T23:12:09+00:00",
  "road_source": "trunk-adopted-routes/aston-expressway.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_8_329367_20210222dtm.tif",
   "wg_del_8_330366_20210222dtm.tif",
   "wg_del_8_330367_20210222dtm.tif"
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  "elevation_capture_dates": [
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  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.8% over 200 m (Terrain 50), gain 22.9 m over 367 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all."
 },
 "area": {
  "place": "Ewloe",
  "county": "Sir y Fflint - Flintshire"
 }
}