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398.36603972524637, "start_xy": [ 319212.3719149316, 348201.64608832094 ], "end_xy": [ 319203.56299952086, 348206.3792700507 ] }, "min_20m": { "gradient_pct": -5.045285952374456, "start_distance_m": 1902.0, "end_distance_m": 1922.0, "midpoint_distance_m": 1912.0, "start_elevation_m": 399.1508743598753, "end_elevation_m": 398.1418171694004, "start_xy": [ 319215.8944628511, 348199.75095224706 ], "end_xy": [ 319198.30306669476, 348209.2649104767 ] }, "min_25m": { "gradient_pct": -4.576921546108224, "start_distance_m": 1899.0, "end_distance_m": 1924.0, "midpoint_distance_m": 1911.5, "start_elevation_m": 399.23603256831507, "end_elevation_m": 398.091802181788, "start_xy": [ 319218.51682597585, 348198.2938278043 ], "end_xy": [ 319196.5689014786, 348210.26123923925 ] }, "min_50m": { "gradient_pct": -4.170590319360258, "start_distance_m": 1871.0, "end_distance_m": 1921.0, "midpoint_distance_m": 1896.0, "start_elevation_m": 400.2788286881352, "end_elevation_m": 398.1935335284551, "start_xy": [ 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319662.01876872027, 347652.6406277552 ], "end_xy": [ 319659.188159171, 347653.63443335996 ] } }, "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.", "quality_summary": { "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.277, "obstruction_max_height_m": 23.61, "flagged_windows_m": [] }, "review": [], "extent": [] }, "provenance": { "analysis_version": "0.1.0", "sample_interval_m": 1.0, "interpolation": "bilinear", "smoothing": "none", "gradient_windows_m": [ 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "diagnostic_windows_m": [ 2.0, 3.0 ], "elevation_crs": "EPSG:27700", "elevation_resolution_m": 1.0, "elevation_tiles": [ "data/cache/wales/dtm_1m/wg_del_1_319346_20200326dtm.tif", "data/cache/wales/dtm_1m/wg_del_1_319347_20200326dtm.tif", "data/cache/wales/dtm_1m/wg_del_1_319348_20200326dtm.tif", "data/cache/wales/dtm_1m/wg_del_1_320346_20200326dtm.tif", "data/cache/wales/dtm_1m/wg_del_1_320347_20200326dtm.tif", "data/cache/wales/dtm_1m/wg_del_1_320348_20200326dtm.tif" ], "calculated_at": "2026-08-12T09:09:46+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": [ "wg_del_1_319346_20200326dtm.tif", "wg_del_1_319347_20200326dtm.tif", "wg_del_1_319348_20200326dtm.tif", "wg_del_1_320346_20200326dtm.tif", "wg_del_1_320347_20200326dtm.tif", "wg_del_1_320348_20200326dtm.tif" ], "elevation_capture_dates": [ "26-03-2020" ], "climb_origin": "discovered", "notes": "Coarse pass: max 16.9% over 200 m (Terrain 50), gain 204.4 m over 1763 m way. EXTENDED by graph walk: +4 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): endurance. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (53.0204, -3.1996)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (53.0204, -3.1996)'" }, "area": { "place": "Pentre-dwfr", "county": "Sir Ddinbych - Denbighshire" }, "reported_claims": [], "confidence": "A", "shape": { "ascent_concentration": 0.35, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 546.0, "shape_class": "sustained" } }