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Diagnostic use only: never a headline or ranking value.", "quality_summary": { "structure_suppression": { "masked_fraction": 0.003, "windows_resited": [ 5.0, 10.0, 100.0 ], "windows_unresolved": [], "minima_resited": [], "minima_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.035, "windows_resited": [ 20.0, 25.0, 50.0, 100.0 ], "windows_unresolved": [], "minima_resited": [], "minima_unresolved": [] }, "texture_windows": { "rounds": 3, "windows_masked": [ { "window_m": 5.0, "start_m": 1459.0, "end_m": 1464.0, "raw_pct": 38.7, "reason": "short-step" }, { "window_m": 25.0, "start_m": 1482.0, "end_m": 1507.0, "raw_pct": 18.29, "reason": "mask-edge" }, { "window_m": 25.0, "start_m": 1431.0, "end_m": 1456.0, "raw_pct": 17.78, "reason": "mask-edge" } ], "advisory": [], "unresolved": [], "unstable": [ { "window_m": 5.0, "start_m": 1487.0, "end_m": 1492.0, "raw_pct": 30.66, "reason": "short-step", "perturbations": [ "phase+0.000/mask+0", "phase+0.333/mask+1", "phase+0.667/mask-1" ], "perturbation_reasons": [ "short-step", "", "" ] } ] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.092, "obstruction_max_height_m": 29.06, "flagged_windows_m": [ 2, 3, 20, 25, 50, 100 ] }, "excluded_ranges_m": [ [ 1429.0, 1466.0 ], [ 1480.0, 1513.0 ] ], "review": [ "short_window_divergence" ], "extent": [] }, "provenance": { "analysis_version": "0.1.0", "run_manifest": { "manifest_version": "1", "code_git_sha": "cd1381c557ec0196a6c481fc125290b249b285c2", "code_git_dirty": "true", "analysis_version": "0.1.0", "analysis_config_digest": "sha256:faa4beed0662d2f6", "python": "3.14.4", "numpy": "2.5.3", "rasterio": "1.5.1", "pyproj": "3.8.0", "laspy": "2.7.0", "shapely": "2.1.2", "pyosmium": "4.3.1", "libosmium": "2.23.1", "gdal": "3.12.4", "proj": "9.8.1", "run_id": "remeasure-260920-uk", "road_pbf": "batch-england-chunk030.pbf", "region_key": "england", "crs": "EPSG:27700", "elevation_provider_key": "england", "authority": "os-open-roads", "registry_pbf": "england-2026-08-27.osm.pbf" }, "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/england/dtm_1m/E348000_N100000_2000m.tif", "data/cache/england/dtm_1m/E348000_N102000_2000m.tif" ], "calculated_at": "2026-09-21T01:57:08+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "output/remeasure-260920/uk/batch-england-chunk030.pbf", "osm_snapshot": "", "run_id": "remeasure-260920-uk", "elevation_provider": "Environment Agency", "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)", "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency", "elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m", "elevation_tile_ids": [ "E348000_N100000_2000m.tif", "E348000_N102000_2000m.tif" ], "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "suppression_unstable": [ 5.0 ], "carriageway": { "stations": 87, "stations_resolved": 87, "width_median_m": 5.0, "width_p10_m": 3.0, "width_min_m": 1.0, "width_max_m": 11.5, "bounded_share": 0.31, "unbounded_share": 0.69, "confidence_median": 0.0, "width_median_bounded_m": 4.75, "window_m": [ 1335.0, 1360.0 ], "width_at_max25_m": 4.62, "window_stations": 6, "single_track": false, "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule", "status": "ok", "source": "dtm", "station_m": 25.0, "window_station_m": 5.0, "halfwidth_m": 6.0, "step_m": 0.25, "level_tol_m": 0.12, "break_min_m": 0.3, "stations_failed": 0, "hedge_to_hedge": { "stations": 87, "stations_resolved": 87, "width_median_m": 4.75, "width_p10_m": 1.0, "width_min_m": 0.5, "width_max_m": 12.0, "bounded_share": 0.943, "unbounded_share": 0.057, "confidence_median": 1.0, "width_median_bounded_m": 4.75, "window_m": [ 1335.0, 1360.0 ], "width_at_max25_m": 1.0, "window_stations": 6, "status": "ok", "source": "dsm", "station_m": 25.0, "window_station_m": 5.0, "halfwidth_m": 6.0, "step_m": 0.25, "level_tol_m": 0.5, "break_min_m": 0.3, "stations_failed": 0 } }, "remeasured": { "on": "2026-09-21", "why": "corpus re-measure 2026-09-21: a mask that exists today reaching a page published before it did; fallers only (Peter: fold the fallers)", "published_max25_pct": 22.88, "max25_pct": 17.53 }, "license": "ODbL-1.0", "license_url": "https://howsteep.org/licensing" }, "area": { "place": "Beaminster", "county": "Dorset" } }