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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "structure_suppression": { "masked_fraction": 0.005, "windows_resited": [], "windows_unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.288, "obstruction_max_height_m": 21.55, "flagged_windows_m": [ 2, 3, 5, 10, 20, 50, 100 ] }, "excluded_ranges_m": [ [ 407.0, 412.0 ], [ 1712.0, 1717.0 ] ], "review": [ "short_window_divergence" ], "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_18_251227_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_251228_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_251229_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_251230_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_252227_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_252228_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_252229_20211201dtm.tif", "data/cache/wales/dtm_1m/wg_del_18_252230_20211201dtm.tif" ], "calculated_at": "2026-09-05T06:02:32+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", "run_id": "summit-260905-summit-wales-wales-2026-08-11", "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_251227_20211201dtm.tif", "wg_del_18_251228_20211201dtm.tif", "wg_del_18_251229_20211201dtm.tif", "wg_del_18_251230_20211201dtm.tif", "wg_del_18_252227_20211201dtm.tif", "wg_del_18_252228_20211201dtm.tif", "wg_del_18_252229_20211201dtm.tif", "wg_del_18_252230_20211201dtm.tif" ], "elevation_capture_dates": [ "01-12-2021" ], "route_summit_trim_m": 1134.3, "route_summit_trim_loss_m": 16.3, "climb_origin": "discovered", "license": "ODbL-1.0", "license_url": "https://howsteep.org/licensing" }, "area": { "place": "Brechfa", "county": "Sir Gaerfyrddin - Carmarthenshire" } }