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"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": { "structure_suppression": { "masked_fraction": 0.01, "windows_resited": [], "windows_unresolved": [], "minima_resited": [], "minima_unresolved": [] }, "texture_suppression": { "masked_fraction": 0.022, "windows_resited": [ 5.0, 10.0, 20.0, 25.0, 50.0, 100.0 ], "windows_unresolved": [], "minima_resited": [], "minima_unresolved": [] }, "texture_windows": { "rounds": 1, "windows_masked": [ { "window_m": 20.0, "start_m": 1468.0, "end_m": 1488.0, "raw_pct": 23.31, "reason": "hump" } ], "advisory": [], "unresolved": [] }, "overhead_obstruction": { "obstruction_threshold_m": 2.0, "obstructed_fraction": 0.085, "obstruction_max_height_m": 17.21, "flagged_windows_m": [ 100 ] }, "excluded_ranges_m": [ [ 0.0, 20.0 ], [ 1466.0, 1490.0 ] ], "review": [ "short_window_divergence" ], "extent": [ "descends_at_start" ] }, "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-chunk004.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/E270000_N48000_2000m.tif", "data/cache/england/dtm_1m/E272000_N48000_2000m.tif", "data/cache/england/dtm_1m/E270000_N50000_2000m.tif", "data/cache/england/dtm_1m/E272000_N50000_2000m.tif" ], "calculated_at": "2026-09-21T01:47:44+00:00", "road_source": "OpenStreetMap (local PBF extract)", "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL", "osm_pbf_path": "output/remeasure-260920/uk/batch-england-chunk004.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": [ "E270000_N48000_2000m.tif", "E272000_N48000_2000m.tif", "E270000_N50000_2000m.tif", "E272000_N50000_2000m.tif" ], "climb_origin": "discovered", "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked", "structure_mask_ranges_m": [ [ 0.0, 15.0 ] ], "carriageway": { "stations": 90, "stations_resolved": 90, "width_median_m": 4.75, "width_p10_m": 2.0, "width_min_m": 1.0, "width_max_m": 10.5, "bounded_share": 0.211, "unbounded_share": 0.789, "confidence_median": 0.0, "width_median_bounded_m": 3.0, "window_m": [ 1416.0, 1441.0 ], "width_at_max25_m": 2.75, "window_stations": 7, "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": 90, "stations_resolved": 90, "width_median_m": 3.5, "width_p10_m": 2.23, "width_min_m": 0.75, "width_max_m": 9.5, "bounded_share": 0.956, "unbounded_share": 0.044, "confidence_median": 1.0, "width_median_bounded_m": 3.38, "window_m": [ 1416.0, 1441.0 ], "width_at_max25_m": 3.25, "window_stations": 7, "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 } }, "unmapped_bridge_span": { "start_m": 1314.0, "end_m": 1483.0, "span_m": 169.0, "floor_at_m": 1399.0, "depth_m": 10.7, "drop_m": 3.6, "surface": "raw", "window_start_m": 1416.0, "window_end_m": 1441.0, "gap_m": 0.0, "unstable": false, "perturbation_hits": 3, "note": "The ground falls 4 m below the road between 1314 m and 1483 m \u2014 11 m below the straight line joining the profile either side of it \u2014 and climbs back to that line, with the steepest 25 m at 1416 m. That is a ravine under a deck OSM does not tag as a bridge, so no mask fired. Re-measure with mask_ranges_m over the span before this maximum stands (unmapped-bridge-span, Peter 2026-09-20)." }, "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": 20.73, "max25_pct": 19.74 }, "license": "ODbL-1.0", "license_url": "https://howsteep.org/licensing" }, "area": { "place": "Loddiswell", "county": "Devon" }, "review_flags": [ { "kind": "possible-bridge-or-hollow", "span_m": [ 1314.0, 1483.0 ], "status": "pending-human-review", "noted": "2026-09-21", "figure_adjusted": false } ] }