{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (53.7086, -2.2721)",
 "slug": "discovered-lane-53-7086-2-2721",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.217205463596486,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 222.0,
   "end_distance_m": 224.0,
   "start_elevation_m": 217.1043550736587,
   "end_elevation_m": 217.94869918293062,
   "min_gradient_pct": -18.572675127327898,
   "suppressed_max_gradient_pct": 46.95144264231601,
   "suppressed_location_m": [
    993.0,
    995.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.472921903131805,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 222.0,
   "end_distance_m": 225.0,
   "start_elevation_m": 217.1043550736587,
   "end_elevation_m": 218.19854273075265,
   "min_gradient_pct": -13.624730441061198,
   "suppressed_max_gradient_pct": 39.04745593896072,
   "suppressed_location_m": [
    992.0,
    995.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.966571089928948,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 1013.0,
   "end_distance_m": 1018.0,
   "start_elevation_m": 293.214734603421,
   "end_elevation_m": 294.81306315791744,
   "min_gradient_pct": -10.625381862095082,
   "suppressed_max_gradient_pct": 33.450941071115494,
   "suppressed_location_m": [
    990.0,
    995.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.620031887352525,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 1013.0,
   "end_distance_m": 1023.0,
   "start_elevation_m": 293.214734603421,
   "end_elevation_m": 295.67673779215625,
   "min_gradient_pct": -7.770448231654541,
   "suppressed_max_gradient_pct": 26.39851983463643,
   "suppressed_location_m": [
    986.0,
    996.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.63161126181967,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 934.0,
   "end_distance_m": 954.0,
   "start_elevation_m": 278.8474119943382,
   "end_elevation_m": 282.9737342467021,
   "min_gradient_pct": -6.033535511002697,
   "suppressed_max_gradient_pct": 22.04693100204878,
   "suppressed_location_m": [
    975.0,
    995.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.51683393924054,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 924.0,
   "end_distance_m": 949.0,
   "start_elevation_m": 276.8082617168709,
   "end_elevation_m": 281.93747020168104,
   "min_gradient_pct": -5.786325369447923,
   "suppressed_max_gradient_pct": 21.79654866297301,
   "suppressed_location_m": [
    971.0,
    996.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.904346262885838,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 924.0,
   "end_distance_m": 974.0,
   "start_elevation_m": 276.8082617168709,
   "end_elevation_m": 286.7604348483138,
   "min_gradient_pct": -4.301232040193668,
   "suppressed_max_gradient_pct": 20.549914787456714,
   "suppressed_location_m": [
    946.0,
    996.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.60272282193472,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 887.0,
   "end_distance_m": 987.0,
   "start_elevation_m": 270.5736028415477,
   "end_elevation_m": 289.17632566348243,
   "min_gradient_pct": 3.3843485150798926,
   "suppressed_max_gradient_pct": 19.637569447660326,
   "suppressed_location_m": [
    896.0,
    996.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.412,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 180.0,
  "shape_class": "sustained"
 },
 "length_m": 1126.9065771568273,
 "start_elevation_m": 199.3948630983312,
 "end_elevation_m": 299.67841246752926,
 "endpoint_gain_m": 100.28354936919806,
 "overall_gradient_pct": 8.899011808255866,
 "accumulated_ascent_m": 105.76904129458921,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.966571089928948,
   "start_distance_m": 1013.0,
   "end_distance_m": 1018.0,
   "midpoint_distance_m": 1015.5,
   "start_elevation_m": 293.214734603421,
   "end_elevation_m": 294.81306315791744,
   "start_xy": [
    382375.32646284974,
    423850.49130570254
   ],
   "end_xy": [
    382379.39808405674,
    423853.3884089036
   ]
  },
  "max_10m": {
   "gradient_pct": 24.620031887352525,
   "start_distance_m": 1013.0,
   "end_distance_m": 1023.0,
   "midpoint_distance_m": 1018.0,
   "start_elevation_m": 293.214734603421,
   "end_elevation_m": 295.67673779215625,
   "start_xy": [
    382375.32646284974,
    423850.49130570254
   ],
   "end_xy": [
    382383.352748705,
    423856.4479231447
   ]
  },
  "max_20m": {
   "gradient_pct": 20.63161126181967,
   "start_distance_m": 934.0,
   "end_distance_m": 954.0,
   "midpoint_distance_m": 944.0,
   "start_elevation_m": 278.8474119943382,
   "end_elevation_m": 282.9737342467021,
   "start_xy": [
    382323.4578783758,
    423797.9340270064
   ],
   "end_xy": [
    382326.3555119524,
    423817.69743803114
   ]
  },
  "max_25m": {
   "gradient_pct": 20.51683393924054,
   "start_distance_m": 924.0,
   "end_distance_m": 949.0,
   "midpoint_distance_m": 936.5,
   "start_elevation_m": 276.8082617168709,
   "end_elevation_m": 281.93747020168104,
   "start_xy": [
    382322.2152584885,
    423788.0115334325
   ],
   "end_xy": [
    382325.4687854678,
    423812.7972586211
   ]
  },
  "max_50m": {
   "gradient_pct": 19.904346262885838,
   "start_distance_m": 924.0,
   "end_distance_m": 974.0,
   "midpoint_distance_m": 949.0,
   "start_elevation_m": 276.8082617168709,
   "end_elevation_m": 286.7604348483138,
   "start_xy": [
    382322.2152584885,
    423788.0115334325
   ],
   "end_xy": [
    382342.82681160764,
    423828.93272389844
   ]
  },
  "max_100m": {
   "gradient_pct": 18.60272282193472,
   "start_distance_m": 887.0,
   "end_distance_m": 987.0,
   "midpoint_distance_m": 937.0,
   "start_elevation_m": 270.5736028415477,
   "end_elevation_m": 289.17632566348243,
   "start_xy": [
    382325.38369879295,
    423751.88245963526
   ],
   "end_xy": [
    382353.66005188256,
    423836.11888312025
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.625381862095082,
   "start_distance_m": 1089.0,
   "end_distance_m": 1094.0,
   "midpoint_distance_m": 1091.5,
   "start_elevation_m": 301.235900886716,
   "end_elevation_m": 300.70463179361127,
   "start_xy": [
    382441.34015802335,
    423881.3578208938
   ],
   "end_xy": [
    382446.34002052865,
    423881.3208218563
   ]
  },
  "min_10m": {
   "gradient_pct": -7.770448231654541,
   "start_distance_m": 1089.0,
   "end_distance_m": 1099.0,
   "midpoint_distance_m": 1094.0,
   "start_elevation_m": 301.235900886716,
   "end_elevation_m": 300.45885606355057,
   "start_xy": [
    382441.34015802335,
    423881.3578208938
   ],
   "end_xy": [
    382451.33988712955,
    423881.28436890297
   ]
  },
  "min_20m": {
   "gradient_pct": -6.033535511002697,
   "start_distance_m": 1075.0,
   "end_distance_m": 1095.0,
   "midpoint_distance_m": 1085.0,
   "start_elevation_m": 301.8640662916375,
   "end_elevation_m": 300.657359189437,
   "start_xy": [
    382427.3405351349,
    423881.460368087
   ],
   "end_xy": [
    382447.3399960295,
    423881.31382202776
   ]
  },
  "min_25m": {
   "gradient_pct": -5.786325369447923,
   "start_distance_m": 1075.0,
   "end_distance_m": 1100.0,
   "midpoint_distance_m": 1087.5,
   "start_elevation_m": 301.8640662916375,
   "end_elevation_m": 300.41748494927555,
   "start_xy": [
    382427.3405351349,
    423881.460368087
   ],
   "end_xy": [
    382452.3398585348,
    423881.2768229903
   ]
  },
  "min_50m": {
   "gradient_pct": -4.301232040193668,
   "start_distance_m": 1075.0,
   "end_distance_m": 1125.0,
   "midpoint_distance_m": 1100.0,
   "start_elevation_m": 301.8640662916375,
   "end_elevation_m": 299.7134502715407,
   "start_xy": [
    382427.3405351349,
    423881.460368087
   ],
   "end_xy": [
    382477.3376236161,
    423880.9506492694
   ]
  },
  "min_100m": {
   "gradient_pct": 3.3843485150798926,
   "start_distance_m": 238.0,
   "end_distance_m": 338.0,
   "midpoint_distance_m": 288.0,
   "start_elevation_m": 220.76084871839527,
   "end_elevation_m": 224.14519723347516,
   "start_xy": [
    381861.4582941367,
    423469.50333926384
   ],
   "end_xy": [
    381955.93187547644,
    423490.4382899864
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.217205463596486,
   "start_distance_m": 222.0,
   "end_distance_m": 224.0,
   "midpoint_distance_m": 223.0,
   "start_elevation_m": 217.1043550736587,
   "end_elevation_m": 217.94869918293062,
   "start_xy": [
    381848.603156763,
    423460.4974475717
   ],
   "end_xy": [
    381849.87968590116,
    423462.0370816023
   ]
  },
  "max_3m": {
   "gradient_pct": 36.472921903131805,
   "start_distance_m": 222.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 223.5,
   "start_elevation_m": 217.1043550736587,
   "end_elevation_m": 218.19854273075265,
   "start_xy": [
    381848.603156763,
    423460.4974475717
   ],
   "end_xy": [
    381850.5182856701,
    423462.8066206363
   ]
  }
 },
 "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": {
  "texture_suppression": {
   "masked_fraction": 0.009,
   "windows_resited": [
    2.0,
    3.0,
    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": 5.0,
     "start_m": 990.0,
     "end_m": 995.0,
     "raw_pct": 33.45,
     "reason": "short-step"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.008,
   "obstruction_max_height_m": 4.71,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    988.0,
    997.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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-chunk110.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/E380000_N422000_2000m.tif",
   "data/cache/england/dtm_1m/E382000_N422000_2000m.tif"
  ],
  "calculated_at": "2026-09-21T03:00:24+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/remeasure-260920/uk/batch-england-chunk110.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": [
   "E380000_N422000_2000m.tif",
   "E382000_N422000_2000m.tif"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 52,
   "stations_resolved": 52,
   "width_median_m": 2.75,
   "width_p10_m": 2.0,
   "width_min_m": 1.25,
   "width_max_m": 12.0,
   "bounded_share": 0.346,
   "unbounded_share": 0.654,
   "confidence_median": 0.0,
   "width_median_bounded_m": 2.25,
   "window_m": [
    924.0,
    949.0
   ],
   "width_at_max25_m": 2.5,
   "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": 52,
    "stations_resolved": 52,
    "width_median_m": 4.75,
    "width_p10_m": 3.0,
    "width_min_m": 1.25,
    "width_max_m": 12.0,
    "bounded_share": 0.904,
    "unbounded_share": 0.096,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.75,
    "window_m": [
     924.0,
     949.0
    ],
    "width_at_max25_m": 5.25,
    "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
   }
  },
  "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": 21.77,
   "max25_pct": 20.52
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Rawtenstall",
  "county": "Lancashire"
 }
}