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[ 293745.37310985813, 213222.84657326023 ], "end_xy": [ 293745.6115610847, 213212.84941661384 ] }, "min_20m": { "gradient_pct": -6.007293529972628, "start_distance_m": 1304.0, "end_distance_m": 1324.0, "midpoint_distance_m": 1314.0, "start_elevation_m": 326.8454852158786, "end_elevation_m": 325.6440265098841, "start_xy": [ 293745.3015744902, 213225.84572025415 ], "end_xy": [ 293745.77847694326, 213205.85140696136 ] }, "min_25m": { "gradient_pct": -5.598868465891201, "start_distance_m": 1304.0, "end_distance_m": 1329.0, "midpoint_distance_m": 1316.5, "start_elevation_m": 326.8454852158786, "end_elevation_m": 325.4457680994058, "start_xy": [ 293745.3015744902, 213225.84572025415 ], "end_xy": [ 293746.55434090144, 213200.98842657558 ] }, "min_50m": { "gradient_pct": -4.636487207278606, "start_distance_m": 1268.0, "end_distance_m": 1318.0, "midpoint_distance_m": 1293.0, "start_elevation_m": 328.2745389689436, "end_elevation_m": 325.9562953653043, "start_xy": [ 293752.38419904833, 213260.76084028746 ], "end_xy": [ 293745.63540620735, 213211.84970094918 ] }, "min_100m": { "gradient_pct": -3.903514093655531, "start_distance_m": 1251.0, "end_distance_m": 1351.0, "midpoint_distance_m": 1301.0, "start_elevation_m": 328.9438646722216, "end_elevation_m": 325.04035057856606, "start_xy": [ 293757.1318010092, 213277.0694985646 ], "end_xy": [ 293754.78470499377, 213180.5859486156 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 34.161455380098005, "start_distance_m": 222.0, "end_distance_m": 224.0, "midpoint_distance_m": 223.0, "start_elevation_m": 281.59666430826115, "end_elevation_m": 282.2798934158631, "start_xy": [ 293784.81465913035, 214289.4186161445 ], "end_xy": [ 293784.8848894497, 214287.4198495993 ] }, "max_3m": { "gradient_pct": 35.17071965719841, "start_distance_m": 221.0, "end_distance_m": 224.0, "midpoint_distance_m": 222.5, "start_elevation_m": 281.22477182614716, "end_elevation_m": 282.2798934158631, "start_xy": [ 293784.77954397065, 214290.4179994171 ], "end_xy": [ 293784.8848894497, 214287.4198495993 ] } }, "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": 0.051, "obstruction_max_height_m": 24.65, "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_21_293212_20220113dtm.tif", "data/cache/wales/dtm_1m/wg_del_21_293213_20220113dtm.tif", "data/cache/wales/dtm_1m/wg_del_21_293214_20220113dtm.tif", "data/cache/wales/dtm_1m/wg_del_21_294212_20220113dtm.tif", "data/cache/wales/dtm_1m/wg_del_21_294213_20220113dtm.tif", "data/cache/wales/dtm_1m/wg_del_21_294214_20220113dtm.tif" ], "calculated_at": "2026-08-12T09:07:04+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_21_293212_20220113dtm.tif", "wg_del_21_293213_20220113dtm.tif", "wg_del_21_293214_20220113dtm.tif", "wg_del_21_294212_20220113dtm.tif", "wg_del_21_294213_20220113dtm.tif", "wg_del_21_294214_20220113dtm.tif" ], "elevation_capture_dates": [ "13-01-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 9.3% over 200 m (Terrain 50), gain 50.9 m over 1994 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 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-51-8178-3-5427 ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.8070, -3.5423)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.8070, -3.5423)'" }, "area": { "place": "Ystradfellte", "county": "Powys - Powys" }, "reported_claims": [], "confidence": "A", "shape": { "ascent_concentration": 0.549, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 112.0, "shape_class": "stepped" } }