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"end_elevation_m": 177.64613697133836, "start_xy": [ 253474.7041996315, 242908.42979661064 ], "end_xy": [ 253522.5945814114, 242907.38359944793 ] }, "min_100m": { "gradient_pct": -5.124560840151986, "start_distance_m": 1292.0, "end_distance_m": 1392.0, "midpoint_distance_m": 1342.0, "start_elevation_m": 180.95156168710648, "end_elevation_m": 175.8270008469545, "start_xy": [ 253473.72602709392, 242908.2220022731 ], "end_xy": [ 253555.83885163572, 242871.38612040773 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 36.05981066257584, "start_distance_m": 5022.0, "end_distance_m": 5024.0, "midpoint_distance_m": 5023.0, "start_elevation_m": 358.0885281011228, "end_elevation_m": 358.8097243143743, "start_xy": [ 254287.7655967512, 239709.1104782473 ], "end_xy": [ 254285.95534004876, 239708.26020142698 ] }, "max_3m": { "gradient_pct": 30.96850368776624, "start_distance_m": 5021.0, "end_distance_m": 5024.0, "midpoint_distance_m": 5022.5, "start_elevation_m": 357.8806692037413, "end_elevation_m": 358.8097243143743, "start_xy": [ 254288.67072510245, 239709.5356166575 ], "end_xy": [ 254285.95534004876, 239708.26020142698 ] } }, "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": 0.088, "obstruction_max_height_m": 17.02, "flagged_windows_m": [ 100 ] }, "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_28_252239_20220315dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_252240_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_252241_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_252242_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_252243_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_253239_20220315dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_253240_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_253241_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_253242_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_253243_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_254239_20220315dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_254240_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_254241_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_254242_20220314dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_254243_20220314dtm.tif" ], "calculated_at": "2026-08-12T09:07:45+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_28_252239_20220315dtm.tif", "wg_del_28_252240_20220314dtm.tif", "wg_del_28_252241_20220314dtm.tif", "wg_del_28_252242_20220314dtm.tif", "wg_del_28_252243_20220314dtm.tif", "wg_del_28_253239_20220315dtm.tif", "wg_del_28_253240_20220314dtm.tif", "wg_del_28_253241_20220314dtm.tif", "wg_del_28_253242_20220314dtm.tif", "wg_del_28_253243_20220314dtm.tif", "wg_del_28_254239_20220315dtm.tif", "wg_del_28_254240_20220314dtm.tif", "wg_del_28_254241_20220314dtm.tif", "wg_del_28_254242_20220314dtm.tif", "wg_del_28_254243_20220314dtm.tif" ], "elevation_capture_dates": [ "15-03-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 11.0% over 200 m (Terrain 50), gain 201.0 m over 4281 m way. EXTENDED by graph walk: +6 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 3 overlapping proposal(s): discovered-lane-52-0647-4-1441, discovered-lane-52-0672-4-1361, heol-y-dderi ADOPTED (notable slice 2026-08-11): big-gain. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.0519, -4.1334)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.0519, -4.1334)'" }, "area": { "place": "Ceunant F\u00e2ch", "county": "Sir Gaerfyrddin - Carmarthenshire" }, "reported_claims": [], "confidence": "B", "shape": { "ascent_concentration": 0.342, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 101.0, "shape_class": "sustained" } }