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"midpoint_distance_m": 439.0, "start_elevation_m": 192.7494722154839, "end_elevation_m": 193.929140801041, "start_xy": [ 257991.8961381315, 228304.42950293038 ], "end_xy": [ 257992.3807465199, 228306.36990358742 ] }, "max_3m": { "gradient_pct": 50.65075067564919, "start_distance_m": 438.0, "end_distance_m": 441.0, "midpoint_distance_m": 439.5, "start_elevation_m": 192.7494722154839, "end_elevation_m": 194.26899473575338, "start_xy": [ 257991.8961381315, 228304.42950293038 ], "end_xy": [ 257992.6230507141, 228307.34010391595 ] } }, "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": 0.186, "obstruction_max_height_m": 13.68, "flagged_windows_m": [ 2, 3, 5 ] }, "structure_suppression": { "masked_fraction": 0.009, "windows_resited": [ 2.0, 3.0, 5.0 ], "windows_unresolved": [] }, "review": [], "extent": [ "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_18_257228_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_257229_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_257230_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_258228_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_258229_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_258230_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_259228_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_259229_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_259230_20211201dtm.tif" ], "calculated_at": "2026-08-12T01:18:07+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_18_257228_20211201dtm.tif", "wg_del_18_257229_20211201dtm.tif", "wg_del_18_257230_20211201dtm.tif", "wg_del_18_258228_20211201dtm.tif", "wg_del_18_258229_20211201dtm.tif", "wg_del_18_258230_20211201dtm.tif", "wg_del_18_259228_20211201dtm.tif", "wg_del_18_259229_20211201dtm.tif", "wg_del_18_259230_20211201dtm.tif" ], "elevation_capture_dates": [ "01-12-2021" ], "climb_origin": "discovered", "notes": "Coarse pass: max 13.1% over 200 m (Terrain 50), gain 136.2 m over 3011 m way. EXTENDED by graph walk: +2 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 2 overlapping proposal(s): discovered-lane-51-9269-4-0698, discovered-lane-51-9291-4-0735 ROAD-REVIEW: way 820845182: unnamed service way; way 820845182: service way, surface untagged", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.9436, -4.0645)'" }, "area": { "place": "Capel Isaac", "county": "Sir Gaerfyrddin - Carmarthenshire" }, "reported_claims": [], "confidence": "B", "shape": { "ascent_concentration": 0.488, "concentration_window_frac": 0.25, "longest_pitch_10pct_m": 68.0, "shape_class": "stepped" } }