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"end_elevation_m": 319.3145720540345, "start_xy": [ 280565.9469751759, 256773.69600675022 ], "end_xy": [ 280601.5781375865, 256738.63713220743 ] }, "min_100m": { "gradient_pct": -4.722996538080622, "start_distance_m": 353.0, "end_distance_m": 453.0, "midpoint_distance_m": 403.0, "start_elevation_m": 324.4107752568569, "end_elevation_m": 319.68777871877626, "start_xy": [ 280524.5491131703, 256812.87223927007 ], "end_xy": [ 280596.4220261816, 256743.37152923137 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 39.75048543240973, "start_distance_m": 1365.0, "end_distance_m": 1367.0, "midpoint_distance_m": 1366.0, "start_elevation_m": 364.95915995467374, "end_elevation_m": 365.75416966332193, "start_xy": [ 281234.8088376, 256295.4934867749 ], "end_xy": [ 281236.6622558446, 256296.24504569496 ] }, "max_3m": { "gradient_pct": 32.762938005479704, "start_distance_m": 1605.0, "end_distance_m": 1608.0, "midpoint_distance_m": 1606.5, "start_elevation_m": 399.94327771950356, "end_elevation_m": 400.92616585966795, "start_xy": [ 281464.5619777918, 256354.63436041196 ], "end_xy": [ 281467.251156744, 256355.9641410566 ] } }, "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": 0.026, "obstruction_max_height_m": 9.5, "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_22_280256_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_280257_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_281256_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_281257_20220114dtm.tif" ], "calculated_at": "2026-08-12T09:08:13+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_22_280256_20220114dtm.tif", "wg_del_22_280257_20220114dtm.tif", "wg_del_22_281256_20220114dtm.tif", "wg_del_22_281257_20220114dtm.tif" ], "elevation_capture_dates": [ "14-01-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 11.0% over 200 m (Terrain 50), gain 42.0 m over 1232 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.1942, -3.7457)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.1942, -3.7457)'" }, "area": { "place": "Coed Nant-yr-hwch", "county": "Powys - Powys" }, "reported_claims": [], "confidence": "A", "shape": { "ascent_concentration": 0.505, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 425.0, "shape_class": "stepped" } }