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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.066, "obstruction_max_height_m": 24.89, "flagged_windows_m": [] }, "review": [ "short_window_divergence" ], "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_28_282241_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_282242_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_282243_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_282244_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_282245_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_283241_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_283242_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_283245_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_284241_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_284242_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_284245_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_285241_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_285242_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_285243_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_285245_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_286241_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_286242_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_286243_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_286244_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_28_286245_20220316dtm.tif", "data/cache/wales/dtm_1m/wg_del_30_283243_20220323dtm.tif", "data/cache/wales/dtm_1m/wg_del_30_283244_20220323dtm.tif", "data/cache/wales/dtm_1m/wg_del_30_284243_20220323dtm.tif", "data/cache/wales/dtm_1m/wg_del_30_284244_20220323dtm.tif", "data/cache/wales/dtm_1m/wg_del_30_285244_20220323dtm.tif" ], "calculated_at": "2026-08-12T23:12:16+00:00", "road_source": "trunk-adopted-routes/discovered-lane-52-0725-3-6991.geojson", "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_28_282241_20220316dtm.tif", "wg_del_28_282242_20220316dtm.tif", "wg_del_28_282243_20220316dtm.tif", "wg_del_28_282244_20220316dtm.tif", "wg_del_28_282245_20220316dtm.tif", "wg_del_28_283241_20220316dtm.tif", "wg_del_28_283242_20220316dtm.tif", "wg_del_28_283245_20220316dtm.tif", "wg_del_28_284241_20220316dtm.tif", "wg_del_28_284242_20220316dtm.tif", "wg_del_28_284245_20220316dtm.tif", "wg_del_28_285241_20220316dtm.tif", "wg_del_28_285242_20220316dtm.tif", "wg_del_28_285243_20220316dtm.tif", "wg_del_28_285245_20220316dtm.tif", "wg_del_28_286241_20220316dtm.tif", "wg_del_28_286242_20220316dtm.tif", "wg_del_28_286243_20220316dtm.tif", "wg_del_28_286244_20220316dtm.tif", "wg_del_28_286245_20220316dtm.tif", "wg_del_30_283243_20220323dtm.tif", "wg_del_30_283244_20220323dtm.tif", "wg_del_30_284243_20220323dtm.tif", "wg_del_30_284244_20220323dtm.tif", "wg_del_30_285244_20220323dtm.tif" ], "elevation_capture_dates": [ "17-03-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 8.6% over 200 m (Terrain 50), gain 84.7 m over 5782 m way. EXTENDED by graph walk: +2 segment(s) at base, +3 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (trunk sweep, Peter's on-sight verdict 2026-08-12): clean table, adopt-all. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.0725, -3.6991)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.0725, -3.6991)'" }, "area": { "place": "Cwm-bychan", "county": "Sir Gaerfyrddin - Carmarthenshire" }, "reported_claims": [], "confidence": "U" }