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"end_elevation_m": 226.69124087121142, "start_xy": [ 305838.1785841398, 257845.54978716603 ], "end_xy": [ 305880.93483136303, 257819.62869289535 ] }, "min_100m": { "gradient_pct": -10.602404104723348, "start_distance_m": 726.0, "end_distance_m": 826.0, "midpoint_distance_m": 776.0, "start_elevation_m": 237.08881052354434, "end_elevation_m": 226.486406418821, "start_xy": [ 305797.1103461142, 257870.39731874314 ], "end_xy": [ 305882.64499079564, 257818.591699783 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 24.22602289758231, "start_distance_m": 2348.0, "end_distance_m": 2350.0, "midpoint_distance_m": 2349.0, "start_elevation_m": 277.04170759260245, "end_elevation_m": 277.5262280505541, "start_xy": [ 307174.79814544047, 257242.32943079207 ], "end_xy": [ 307176.72184418835, 257241.78227164946 ] }, "max_3m": { "gradient_pct": 23.901825788114667, "start_distance_m": 2347.0, "end_distance_m": 2350.0, "midpoint_distance_m": 2348.5, "start_elevation_m": 276.80917327691066, "end_elevation_m": 277.5262280505541, "start_xy": [ 307173.8362960665, 257242.60301036338 ], "end_xy": [ 307176.72184418835, 257241.78227164946 ] } }, "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": 0.176, "obstruction_max_height_m": 21.86, "flagged_windows_m": [] }, "review": [], "extent": [ "descends_at_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_13_305256_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_305257_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_305258_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_306256_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_306257_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_306258_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_307256_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_307257_20210317dtm.tif", "data/cache/wales/dtm_1m/wg_del_13_307258_20210317dtm.tif" ], "calculated_at": "2026-08-12T09:08:14+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_13_305256_20210317dtm.tif", "wg_del_13_305257_20210317dtm.tif", "wg_del_13_305258_20210317dtm.tif", "wg_del_13_306256_20210317dtm.tif", "wg_del_13_306257_20210317dtm.tif", "wg_del_13_306258_20210317dtm.tif", "wg_del_13_307256_20210317dtm.tif", "wg_del_13_307257_20210317dtm.tif", "wg_del_13_307258_20210317dtm.tif" ], "elevation_capture_dates": [ "17-03-2021" ], "climb_origin": "discovered", "notes": "Coarse pass: max 14.9% over 200 m (Terrain 50), gain 88.3 m over 2495 m way. EXTENDED by graph walk: +0 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 2 overlapping proposal(s): discovered-lane-52-2033-3-3564, discovered-lane-52-2054-3-3547 ROAD-REVIEW: way 409293041: unnamed service way; way 409293041: service way, surface untagged ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.2063, -3.3703)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.2063, -3.3703)'" }, "area": { "place": "Crossway", "county": "Powys - Powys" }, "reported_claims": [], "confidence": "A", "shape": { "ascent_concentration": 0.473, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 195.0, "shape_class": "stepped" } }