{
 "ocl_version": "0.1.0",
 "name": "Newcastle to Spoad Hill",
 "slug": "discovered-lane-52-4267-3-1131",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 57.448092657013206,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 329.0,
   "end_distance_m": 331.0,
   "start_elevation_m": 252.0632633858493,
   "end_elevation_m": 253.21222523898956,
   "min_gradient_pct": -39.54836357482918,
   "suppressed_max_gradient_pct": 100.07051130763642,
   "suppressed_location_m": [
    0.0,
    2.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 56.945571406805584,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 328.0,
   "end_distance_m": 331.0,
   "start_elevation_m": 251.5038580967854,
   "end_elevation_m": 253.21222523898956,
   "min_gradient_pct": -32.83351363810615,
   "suppressed_max_gradient_pct": 76.61666111235377,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 49.19394693263882,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 331.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 253.21222523898956,
   "min_gradient_pct": -21.33206437727722
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 42.40497358223337,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 336.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 254.99302525058096,
   "min_gradient_pct": -9.153581449496073
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 32.913586010796934,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 346.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 257.335245094517,
   "min_gradient_pct": -1.652503605164668
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 30.510777675482473,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 351.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 258.38022231122824,
   "min_gradient_pct": 0.7753122698252355
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.643559034463177,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 376.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 262.5743074095892,
   "min_gradient_pct": 2.8370884677519825
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.695729552734946,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 273.0,
   "end_distance_m": 373.0,
   "start_elevation_m": 241.4620323643625,
   "end_elevation_m": 262.15776191709745,
   "min_gradient_pct": 4.2259991038781095
  }
 ],
 "shape": {
  "ascent_concentration": 0.352,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 221.0,
  "shape_class": "sustained"
 },
 "length_m": 1765.3145661157744,
 "start_elevation_m": 207.91823813716564,
 "end_elevation_m": 397.41428947766195,
 "endpoint_gain_m": 189.4960513404963,
 "overall_gradient_pct": 10.73440705570367,
 "accumulated_ascent_m": 200.11627235568565,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 49.19394693263882,
   "start_distance_m": 326.0,
   "end_distance_m": 331.0,
   "midpoint_distance_m": 328.5,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 253.21222523898956,
   "start_xy": [
    324923.7269700966,
    281836.99865565414
   ],
   "end_xy": [
    324919.49616228405,
    281834.338268438
   ]
  },
  "max_10m": {
   "gradient_pct": 42.40497358223337,
   "start_distance_m": 326.0,
   "end_distance_m": 336.0,
   "midpoint_distance_m": 331.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 254.99302525058096,
   "start_xy": [
    324923.7269700966,
    281836.99865565414
   ],
   "end_xy": [
    324915.2492079471,
    281831.69944694726
   ]
  },
  "max_20m": {
   "gradient_pct": 32.913586010796934,
   "start_distance_m": 326.0,
   "end_distance_m": 346.0,
   "midpoint_distance_m": 336.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 257.335245094517,
   "start_xy": [
    324923.7269700966,
    281836.99865565414
   ],
   "end_xy": [
    324906.75529927324,
    281826.42180396576
   ]
  },
  "max_25m": {
   "gradient_pct": 30.510777675482473,
   "start_distance_m": 326.0,
   "end_distance_m": 351.0,
   "midpoint_distance_m": 338.5,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 258.38022231122824,
   "start_xy": [
    324923.7269700966,
    281836.99865565414
   ],
   "end_xy": [
    324902.5083449363,
    281823.782982475
   ]
  },
  "max_50m": {
   "gradient_pct": 23.643559034463177,
   "start_distance_m": 326.0,
   "end_distance_m": 376.0,
   "midpoint_distance_m": 351.0,
   "start_elevation_m": 250.75252789235762,
   "end_elevation_m": 262.5743074095892,
   "start_xy": [
    324923.7269700966,
    281836.99865565414
   ],
   "end_xy": [
    324881.2735732517,
    281810.58887502126
   ]
  },
  "max_100m": {
   "gradient_pct": 20.695729552734946,
   "start_distance_m": 273.0,
   "end_distance_m": 373.0,
   "midpoint_distance_m": 323.0,
   "start_elevation_m": 241.4620323643625,
   "end_elevation_m": 262.15776191709745,
   "start_xy": [
    324972.27238961257,
    281850.1435479226
   ],
   "end_xy": [
    324883.8217458538,
    281812.17216791573
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.33206437727722,
   "start_distance_m": 552.0,
   "end_distance_m": 557.0,
   "midpoint_distance_m": 554.5,
   "start_elevation_m": 285.5279715370541,
   "end_elevation_m": 284.46136831819024,
   "start_xy": [
    324731.9898772112,
    281717.3746603524
   ],
   "end_xy": [
    324727.80736947095,
    281714.6348375475
   ]
  },
  "min_10m": {
   "gradient_pct": -9.153581449496073,
   "start_distance_m": 397.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 402.0,
   "start_elevation_m": 264.8757588260169,
   "end_elevation_m": 263.9604006810673,
   "start_xy": [
    324863.4363650366,
    281799.5058247601
   ],
   "end_xy": [
    324854.9424563627,
    281794.2281817786
   ]
  },
  "min_20m": {
   "gradient_pct": -1.652503605164668,
   "start_distance_m": 392.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 402.0,
   "start_elevation_m": 264.5900782859812,
   "end_elevation_m": 264.25957756494824,
   "start_xy": [
    324867.6833193735,
    281802.1446462509
   ],
   "end_xy": [
    324850.6955020258,
    281791.5893602879
   ]
  },
  "min_25m": {
   "gradient_pct": 0.7753122698252355,
   "start_distance_m": 387.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 399.5,
   "start_elevation_m": 264.06574949749194,
   "end_elevation_m": 264.25957756494824,
   "start_xy": [
    324871.9302737104,
    281804.7834677416
   ],
   "end_xy": [
    324850.6955020258,
    281791.5893602879
   ]
  },
  "min_50m": {
   "gradient_pct": 2.8370884677519825,
   "start_distance_m": 1715.0,
   "end_distance_m": 1765.0,
   "midpoint_distance_m": 1740.0,
   "start_elevation_m": 396.0031614428606,
   "end_elevation_m": 397.42170567673656,
   "start_xy": [
    323932.2576518391,
    280988.68043230916
   ],
   "end_xy": [
    323931.9468310561,
    280938.80574158794
   ]
  },
  "min_100m": {
   "gradient_pct": 4.2259991038781095,
   "start_distance_m": 874.0,
   "end_distance_m": 974.0,
   "midpoint_distance_m": 924.0,
   "start_elevation_m": 318.29391912923825,
   "end_elevation_m": 322.51991823311636,
   "start_xy": [
    324450.72749406006,
    281562.44419772
   ],
   "end_xy": [
    324363.29129143263,
    281516.09732462454
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 57.448092657013206,
   "start_distance_m": 329.0,
   "end_distance_m": 331.0,
   "midpoint_distance_m": 330.0,
   "start_elevation_m": 252.0632633858493,
   "end_elevation_m": 253.21222523898956,
   "start_xy": [
    324921.1949440188,
    281835.3937970343
   ],
   "end_xy": [
    324919.49616228405,
    281834.338268438
   ]
  },
  "max_3m": {
   "gradient_pct": 56.945571406805584,
   "start_distance_m": 328.0,
   "end_distance_m": 331.0,
   "midpoint_distance_m": 329.5,
   "start_elevation_m": 251.5038580967854,
   "end_elevation_m": 253.21222523898956,
   "start_xy": [
    324922.0443348862,
    281835.9215613324
   ],
   "end_xy": [
    324919.49616228405,
    281834.338268438
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.027,
   "obstruction_max_height_m": 12.25,
   "flagged_windows_m": [
    2
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.01,
   "windows_resited": [
    2.0,
    3.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    4.0
   ],
   [
    823.0,
    828.0
   ],
   [
    865.0,
    870.0
   ]
  ],
  "review": [
   "max5_over_45",
   "max10_over_40"
  ],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/england/bulk_dtm_1m/SO2080.tif",
   "data/cache/england/bulk_dtm_1m/SO2580.tif"
  ],
  "calculated_at": "2026-08-15T14:48:54+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "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": [
   "SO2080.tif",
   "SO2580.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.7% over 200 m (Terrain 50), gain 181.1 m over 1665 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.4267, -3.1131)'"
 },
 "area": {
  "place": "Newcastle",
  "county": "Shropshire"
 }
}