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234.33934806418895, "end_elevation_m": 228.82206307933478, "start_xy": [ 305112.11081653927, 192880.4059793563 ], "end_xy": [ 305078.1893117463, 192916.8370423668 ] }, "min_100m": { "gradient_pct": -9.976348215147851, "start_distance_m": 2479.0, "end_distance_m": 2579.0, "midpoint_distance_m": 2529.0, "start_elevation_m": 252.52458435338465, "end_elevation_m": 242.5482361382368, "start_xy": [ 305368.7479191089, 192584.77146642786 ], "end_xy": [ 305320.68055459973, 192671.45409968225 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 35.965198403692966, "start_distance_m": 6451.0, "end_distance_m": 6453.0, "midpoint_distance_m": 6452.0, "start_elevation_m": 329.357772219745, "end_elevation_m": 330.0770761878189, "start_xy": [ 303158.40782183735, 195234.56224064715 ], "end_xy": [ 303157.62580541184, 195236.40301502505 ] }, "max_3m": { "gradient_pct": 32.22446631058915, "start_distance_m": 6823.0, "end_distance_m": 6826.0, "midpoint_distance_m": 6824.5, "start_elevation_m": 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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.211, "obstruction_max_height_m": 28.63, "flagged_windows_m": [ 3, 5 ] }, "no_bench_suppression": { "masked_fraction": 0.004, "windows_resited": [], "windows_unresolved": [] }, "excluded_ranges_m": [ [ 6760.0, 6790.0 ] ], "review": [], "extent": [ "may_start_earlier", "may_continue_beyond_end" ] }, "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_2_302190_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_2_303190_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_3_304190_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_3_305190_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_3_306190_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_302191_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_302192_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_302193_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_302194_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_302195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_303191_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_303192_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_303193_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_303194_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_303195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_304191_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_304192_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_304193_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_304194_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_304195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_305191_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_305192_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_305193_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_305194_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_305195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_306191_20201201dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_306192_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_306193_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_306194_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_306195_20201224dtm.tif" ], "calculated_at": "2026-08-12T09:06:37+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_2_302190_20201201dtm.tif", "wg_del_2_303190_20201201dtm.tif", "wg_del_3_304190_20201201dtm.tif", "wg_del_3_305190_20201201dtm.tif", "wg_del_3_306190_20201201dtm.tif", "wg_del_5_302191_20201201dtm.tif", "wg_del_5_302192_20201224dtm.tif", "wg_del_5_302193_20201224dtm.tif", "wg_del_5_302194_20201224dtm.tif", "wg_del_5_302195_20201224dtm.tif", "wg_del_5_303191_20201201dtm.tif", "wg_del_5_303192_20201224dtm.tif", "wg_del_5_303193_20201224dtm.tif", "wg_del_5_303194_20201224dtm.tif", "wg_del_5_303195_20201224dtm.tif", "wg_del_5_304191_20201201dtm.tif", "wg_del_5_304192_20201224dtm.tif", "wg_del_5_304193_20201224dtm.tif", "wg_del_5_304194_20201224dtm.tif", "wg_del_5_304195_20201224dtm.tif", "wg_del_5_305191_20201201dtm.tif", "wg_del_5_305192_20201224dtm.tif", "wg_del_5_305193_20201224dtm.tif", "wg_del_5_305194_20201224dtm.tif", "wg_del_5_305195_20201224dtm.tif", "wg_del_5_306191_20201201dtm.tif", "wg_del_5_306192_20201224dtm.tif", "wg_del_5_306193_20201224dtm.tif", "wg_del_5_306194_20201224dtm.tif", "wg_del_5_306195_20201224dtm.tif" ], "elevation_capture_dates": [ "01-12-2020", "24-12-2020" ], "climb_origin": "discovered", "notes": "Coarse pass: max 9.7% over 200 m (Terrain 50), gain 132.1 m over 6206 m way. EXTENDED by graph walk: +9 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 1 overlapping proposal(s): discovered-lane-51-6155-3-3596 ROAD-REVIEW: way 1117448867: unnamed service way; way 1117448867: service way, surface untagged ADOPTED (notable slice 2026-08-11): big-gain. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.6322, -3.3841)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.6322, -3.3841)'" }, "area": { "place": "Cwm Hafod", "county": "Rhondda Cynon Taf - Rhondda Cynon Taf" }, "reported_claims": [], "confidence": "B", "shape": { "ascent_concentration": 0.342, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 162.0, "shape_class": "sustained" } }