{
 "ocl_version": "0.1.0",
 "name": "Boarsgreave Lane",
 "slug": "boarsgreave-lane",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.152171354601876,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 45.0,
   "end_distance_m": 47.0,
   "start_elevation_m": 248.7029579421668,
   "end_elevation_m": 249.56600136925883,
   "min_gradient_pct": -14.614824152978656
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.26871652077193,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 45.0,
   "end_distance_m": 48.0,
   "start_elevation_m": 248.7029579421668,
   "end_elevation_m": 249.97101943778995,
   "min_gradient_pct": -10.379775871720653
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.146084902842745,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 44.0,
   "end_distance_m": 49.0,
   "start_elevation_m": 248.45002672129476,
   "end_elevation_m": 250.2073309664369,
   "min_gradient_pct": -5.288235089249724
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.761823276721202,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 256.49420437044455,
   "end_elevation_m": 258.97038669811667,
   "min_gradient_pct": 1.1617419759170389
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.75829972570631,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 177.0,
   "end_distance_m": 197.0,
   "start_elevation_m": 265.9121036019629,
   "end_elevation_m": 270.06376354710414,
   "min_gradient_pct": 3.63037234351566
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.60679051122156,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 177.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 265.9121036019629,
   "end_elevation_m": 271.0638012297683,
   "min_gradient_pct": 4.751147310235524
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.728556581322096,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 164.0,
   "end_distance_m": 214.0,
   "start_elevation_m": 263.49148942376974,
   "end_elevation_m": 273.3557677144308,
   "min_gradient_pct": 7.055887967415117
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.857193369098013,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 125.0,
   "end_distance_m": 225.0,
   "start_elevation_m": 256.38295907525924,
   "end_elevation_m": 275.24015244435725,
   "min_gradient_pct": 10.196308179142164
  }
 ],
 "shape": {
  "ascent_concentration": 0.37,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 },
 "length_m": 251.65727608796058,
 "start_elevation_m": 244.72386876947064,
 "end_elevation_m": 277.0842151076042,
 "endpoint_gain_m": 32.36034633813358,
 "overall_gradient_pct": 12.858895574639702,
 "accumulated_ascent_m": 33.12761567084132,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.146084902842745,
   "start_distance_m": 44.0,
   "end_distance_m": 49.0,
   "midpoint_distance_m": 46.5,
   "start_elevation_m": 248.45002672129476,
   "end_elevation_m": 250.2073309664369,
   "start_xy": [
    383952.46154256124,
    420757.6899485381
   ],
   "end_xy": [
    383954.90239702724,
    420753.3262085906
   ]
  },
  "max_10m": {
   "gradient_pct": 24.761823276721202,
   "start_distance_m": 126.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 131.0,
   "start_elevation_m": 256.49420437044455,
   "end_elevation_m": 258.97038669811667,
   "start_xy": [
    384019.1429394693,
    420738.75013030565
   ],
   "end_xy": [
    384028.75795194926,
    420741.4981338732
   ]
  },
  "max_20m": {
   "gradient_pct": 20.75829972570631,
   "start_distance_m": 177.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 187.0,
   "start_elevation_m": 265.9121036019629,
   "end_elevation_m": 270.06376354710414,
   "start_xy": [
    384068.9081481238,
    420749.7113460767
   ],
   "end_xy": [
    384088.54999864445,
    420753.47931745945
   ]
  },
  "max_25m": {
   "gradient_pct": 20.60679051122156,
   "start_distance_m": 177.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 189.5,
   "start_elevation_m": 265.9121036019629,
   "end_elevation_m": 271.0638012297683,
   "start_xy": [
    384068.9081481238,
    420749.7113460767
   ],
   "end_xy": [
    384093.46044360544,
    420754.4214026454
   ]
  },
  "max_50m": {
   "gradient_pct": 19.728556581322096,
   "start_distance_m": 164.0,
   "end_distance_m": 214.0,
   "midpoint_distance_m": 189.0,
   "start_elevation_m": 263.49148942376974,
   "end_elevation_m": 273.3557677144308,
   "start_xy": [
    384056.1411040077,
    420747.2613376308
   ],
   "end_xy": [
    384105.3324131108,
    420753.12375989626
   ]
  },
  "max_100m": {
   "gradient_pct": 18.857193369098013,
   "start_distance_m": 125.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 175.0,
   "start_elevation_m": 256.38295907525924,
   "end_elevation_m": 275.24015244435725,
   "start_xy": [
    384018.1815263475,
    420738.47502158745
   ],
   "end_xy": [
    384113.7711242544,
    420746.9706048055
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.288235089249724,
   "start_distance_m": 66.0,
   "end_distance_m": 71.0,
   "midpoint_distance_m": 68.5,
   "start_elevation_m": 252.6526159097752,
   "end_elevation_m": 252.3882041553127,
   "start_xy": [
    383963.5767433198,
    420738.7578229509
   ],
   "end_xy": [
    383966.94083188544,
    420735.05917303066
   ]
  },
  "min_10m": {
   "gradient_pct": 1.1617419759170389,
   "start_distance_m": 115.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 120.0,
   "start_elevation_m": 256.26678487766753,
   "end_elevation_m": 256.38295907525924,
   "start_xy": [
    384008.56651386846,
    420735.72701801645
   ],
   "end_xy": [
    384018.1815263475,
    420738.47502158745
   ]
  },
  "min_20m": {
   "gradient_pct": 3.63037234351566,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 244.72386876947064,
   "end_elevation_m": 245.44994323817377,
   "start_xy": [
    383925.874,
    420787.066
   ],
   "end_xy": [
    383943.4479973477,
    420779.84536380525
   ]
  },
  "min_25m": {
   "gradient_pct": 4.751147310235524,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 244.72386876947064,
   "end_elevation_m": 245.91165559702952,
   "start_xy": [
    383925.874,
    420787.066
   ],
   "end_xy": [
    383945.06299574417,
    420775.1133685016
   ]
  },
  "min_50m": {
   "gradient_pct": 7.055887967415117,
   "start_distance_m": 75.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 100.0,
   "start_elevation_m": 252.85501509155168,
   "end_elevation_m": 256.38295907525924,
   "start_xy": [
    383970.0321217314,
    420732.5208457153
   ],
   "end_xy": [
    384018.1815263475,
    420738.47502158745
   ]
  },
  "min_100m": {
   "gradient_pct": 10.196308179142164,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 244.72386876947064,
   "end_elevation_m": 254.9201769486128,
   "start_xy": [
    383925.874,
    420787.066
   ],
   "end_xy": [
    383993.96668654354,
    420732.3723273086
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.152171354601876,
   "start_distance_m": 45.0,
   "end_distance_m": 47.0,
   "midpoint_distance_m": 46.0,
   "start_elevation_m": 248.7029579421668,
   "end_elevation_m": 249.56600136925883,
   "start_xy": [
    383952.9498934853,
    420756.8173012036
   ],
   "end_xy": [
    383953.92652202374,
    420755.0719657239
   ]
  },
  "max_3m": {
   "gradient_pct": 42.26871652077193,
   "start_distance_m": 45.0,
   "end_distance_m": 48.0,
   "midpoint_distance_m": 46.5,
   "start_elevation_m": 248.7029579421668,
   "end_elevation_m": 249.97101943778995,
   "start_xy": [
    383952.9498934853,
    420756.8173012036
   ],
   "end_xy": [
    383954.4144554254,
    420754.199084864
   ]
  }
 },
 "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": 0.012,
   "obstruction_max_height_m": 3.71,
   "flagged_windows_m": []
  },
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "may_continue_beyond_end"
  ]
 },
 "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/SD8020.tif"
  ],
  "calculated_at": "2026-08-19T18:05:21+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SD8020.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.4% over 200 m (Terrain 50), gain 24.5 m over 149 m way. EXTENDED by graph walk: +1 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Cowpe",
  "county": "Lancashire"
 }
}