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"end_distance_m": 2539.0, "midpoint_distance_m": 2537.5, "start_elevation_m": 156.29390953425062, "end_elevation_m": 156.97678769706187, "start_xy": [ 282448.01482834225, 316382.1227038985 ], "end_xy": [ 282445.01610595826, 316382.03515925986 ] } }, "diagnostic_note": "Windows <=3 m are at raster-noise scale (roughly +/-2 pp 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": 0.016, "obstruction_max_height_m": 11.72, "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_280315_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_280316_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_280317_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_281315_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_281316_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_281317_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_282315_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_282316_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_282317_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_283315_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_283316_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_283317_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_284315_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_284316_20220114dtm.tif", "data/cache/wales/dtm_1m/wg_del_22_284317_20220114dtm.tif" ], "calculated_at": "2026-08-12T23:11:59+00:00", "road_source": "trunk-adopted-routes/discovered-lane-52-7328-3-7339.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_22_280315_20220114dtm.tif", "wg_del_22_280316_20220114dtm.tif", "wg_del_22_280317_20220114dtm.tif", "wg_del_22_281315_20220114dtm.tif", "wg_del_22_281316_20220114dtm.tif", "wg_del_22_281317_20220114dtm.tif", "wg_del_22_282315_20220114dtm.tif", "wg_del_22_282316_20220114dtm.tif", "wg_del_22_282317_20220114dtm.tif", "wg_del_22_283315_20220114dtm.tif", "wg_del_22_283316_20220114dtm.tif", "wg_del_22_283317_20220114dtm.tif", "wg_del_22_284315_20220114dtm.tif", "wg_del_22_284316_20220114dtm.tif", "wg_del_22_284317_20220114dtm.tif" ], "elevation_capture_dates": [ "14-01-2022" ], "climb_origin": "discovered", "notes": "Coarse pass: max 8.0% over 200 m (Terrain 50), gain 78.7 m over 3266 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 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 (52.7328, -3.7339)'.", "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.7328, -3.7339)'" }, "area": { "place": "Cwm Cerist", "county": "Gwynedd - Gwynedd" } }