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"start_xy": [ 269267.8516955345, 284307.2390797418 ], "end_xy": [ 269317.538459433, 284301.65110217495 ] }, "min_100m": { "gradient_pct": -2.085545938372377, "start_distance_m": 4145.0, "end_distance_m": 4245.0, "midpoint_distance_m": 4195.0, "start_elevation_m": 327.5296927118575, "end_elevation_m": 325.4441467734851, "start_xy": [ 269251.9519310869, 284309.0272325632 ], "end_xy": [ 269351.3594576985, 284298.1956761225 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 50.071739926693226, "start_distance_m": 4006.0, "end_distance_m": 4008.0, "midpoint_distance_m": 4007.0, "start_elevation_m": 313.47846427297014, "end_elevation_m": 314.479899071504, "start_xy": [ 269114.586236609, 284298.1144919333 ], "end_xy": [ 269116.547837425, 284298.5045204429 ] }, "max_3m": { "gradient_pct": 41.22165708647761, "start_distance_m": 4005.0, "end_distance_m": 4008.0, "midpoint_distance_m": 4006.5, "start_elevation_m": 313.2432493589097, "end_elevation_m": 314.479899071504, "start_xy": [ 269113.6054362009, 284297.91947767854 ], "end_xy": [ 269116.547837425, 284298.5045204429 ] } }, "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": 0.049, "obstruction_max_height_m": 13.99, "flagged_windows_m": [] }, "review": [ "short_window_divergence" ], "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_22_266283_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_266284_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_267283_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_267284_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_268283_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_268284_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_269283_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_269284_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_270283_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_270284_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_23_265283_20220117dtm.tif", "data/cache/wales/dtm_1m/wg_del_23_265284_20220117dtm.tif" ], "calculated_at": "2026-08-12T09:08:25+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_266283_20220114dtm.tif", "wg_del_22_266284_20220114dtm.tif", "wg_del_22_267283_20220114dtm.tif", "wg_del_22_267284_20220114dtm.tif", "wg_del_22_268283_20220114dtm.tif", "wg_del_22_268284_20220114dtm.tif", "wg_del_22_269283_20220114dtm.tif", "wg_del_22_269284_20220114dtm.tif", "wg_del_22_270283_20220114dtm.tif", "wg_del_22_270284_20220114dtm.tif", "wg_del_23_265283_20220117dtm.tif", "wg_del_23_265284_20220117dtm.tif" ], "elevation_capture_dates": [ "14-01-2022", "17-01-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 11.5% over 200 m (Terrain 50), gain 190.1 m over 3557 m way. EXTENDED by graph walk: +4 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 4 overlapping proposal(s): discovered-lane-52-4368-3-9769, discovered-lane-52-4375-3-9414, discovered-lane-52-4384-3-9870, discovered-lane-52-4392-3-9084 ADOPTED (notable slice 2026-08-11): big-gain. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.4380, -3.9671)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.4380, -3.9671)'" }, "area": { "place": "Pen-rhiw-newydd", "county": "Sir Ceredigion - Ceredigion" }, "reported_claims": [], "confidence": "U", "shape": { "ascent_concentration": 0.32, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 113.0, "shape_class": "sustained" } }