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"midpoint_distance_m": 1675.0, "start_elevation_m": 293.6921450551905, "end_elevation_m": 291.0966591741917, "start_xy": [ 322409.244364042, 196000.03340670245 ], "end_xy": [ 322397.204872501, 196047.5352039185 ] }, "min_100m": { "gradient_pct": -3.7710329991830918, "start_distance_m": 1645.0, "end_distance_m": 1745.0, "midpoint_distance_m": 1695.0, "start_elevation_m": 293.69076233706056, "end_elevation_m": 289.91972933787747, "start_xy": [ 322410.3314856667, 195995.15302079835 ], "end_xy": [ 322408.0743838204, 196090.79314368105 ] } }, "diagnostic_window_maxima": { "max_2m": { "gradient_pct": 37.93476617779348, "start_distance_m": 302.0, "end_distance_m": 304.0, "midpoint_distance_m": 303.0, "start_elevation_m": 119.7705311124279, "end_elevation_m": 120.52922643598377, "start_xy": [ 321893.4416889557, 195538.58425935422 ], "end_xy": [ 321893.7896915649, 195536.61476851036 ] }, "max_3m": { "gradient_pct": 31.92623823280485, "start_distance_m": 302.0, "end_distance_m": 305.0, "midpoint_distance_m": 303.5, "start_elevation_m": 119.7705311124279, "end_elevation_m": 120.72831825941205, "start_xy": [ 321893.4416889557, 195538.58425935422 ], "end_xy": [ 321893.9636928696, 195535.63002308845 ] } }, "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": 0.261, "obstruction_max_height_m": 22.26, "flagged_windows_m": [ 10, 20, 25, 50, 100 ] }, "review": [], "extent": [ "may_start_earlier" ] }, "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_5_321195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_321196_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_321197_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_321198_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_322195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_322196_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_322197_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_322198_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_323195_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_323196_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_323197_20201224dtm.tif", "data/cache/wales/dtm_1m/wg_del_5_323198_20201224dtm.tif" ], "calculated_at": "2026-08-12T09:06:46+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_5_321195_20201224dtm.tif", "wg_del_5_321196_20201224dtm.tif", "wg_del_5_321197_20201224dtm.tif", "wg_del_5_321198_20201224dtm.tif", "wg_del_5_322195_20201224dtm.tif", "wg_del_5_322196_20201224dtm.tif", "wg_del_5_322197_20201224dtm.tif", "wg_del_5_322198_20201224dtm.tif", "wg_del_5_323195_20201224dtm.tif", "wg_del_5_323196_20201224dtm.tif", "wg_del_5_323197_20201224dtm.tif", "wg_del_5_323198_20201224dtm.tif" ], "elevation_capture_dates": [ "24-12-2020" ], "climb_origin": "discovered", "notes": "Coarse pass: max 11.0% over 200 m (Terrain 50), gain 78.5 m over 2672 m way. EXTENDED by graph walk: +15 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 4 overlapping proposal(s): cemetery-road, discovered-lane-51-6526-3-1260, discovered-lane-51-6554-3-1261, twyn-road-2 ROAD-REVIEW: way 84551751: unnamed service way; way 84551751: service way, surface untagged ADOPTED (notable slice 2026-08-11): big-gain. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.6622, -3.1136)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.6622, -3.1136)'" }, "area": { "place": "Cwm Hafod-fach", "county": "Caerffili - Caerphilly" }, "reported_claims": [], "confidence": "B", "shape": { "ascent_concentration": 0.573, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 707.0, "shape_class": "stepped" } }