{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.2013, -4.1327)",
 "slug": "discovered-lane-51-2013-4-1327",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 36.066660394212846,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 264.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 74.92810435369363,
   "end_elevation_m": 75.64943756157788,
   "min_gradient_pct": -10.135231925009691,
   "suppressed_max_gradient_pct": 52.13464872775688,
   "suppressed_location_m": [
    224.0,
    226.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.9739363734055,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 264.0,
   "end_distance_m": 267.0,
   "start_elevation_m": 74.92810435369363,
   "end_elevation_m": 76.00732244489579,
   "min_gradient_pct": -4.156089990265362,
   "suppressed_max_gradient_pct": 46.35115984092598,
   "suppressed_location_m": [
    223.0,
    226.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.4563637466178,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 263.0,
   "end_distance_m": 268.0,
   "start_elevation_m": 74.6034465717071,
   "end_elevation_m": 76.27626475903799,
   "min_gradient_pct": -0.8190480286073409,
   "suppressed_max_gradient_pct": 37.57358902375671,
   "suppressed_location_m": [
    221.0,
    226.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.32556522294786,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 260.0,
   "end_distance_m": 270.0,
   "start_elevation_m": 73.99757811174723,
   "end_elevation_m": 76.73013463404202,
   "min_gradient_pct": 0.649095154514896,
   "suppressed_max_gradient_pct": 29.084812280858188,
   "suppressed_location_m": [
    218.0,
    228.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.913907669834146,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 257.0,
   "end_distance_m": 277.0,
   "start_elevation_m": 73.38674817003572,
   "end_elevation_m": 78.36952970400255,
   "min_gradient_pct": 2.261035549917665
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.812322110646445,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 252.0,
   "end_distance_m": 277.0,
   "start_elevation_m": 72.41644917634093,
   "end_elevation_m": 78.36952970400255,
   "min_gradient_pct": 3.465879680565962
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.020540618368813,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 153.0,
   "end_distance_m": 203.0,
   "start_elevation_m": 55.27489313003956,
   "end_elevation_m": 63.785163439223965,
   "min_gradient_pct": 5.69991209090287,
   "suppressed_max_gradient_pct": 21.14140394471653,
   "suppressed_location_m": [
    220.0,
    270.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.406689697303534,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 118.0,
   "end_distance_m": 218.0,
   "start_elevation_m": 50.36392762241759,
   "end_elevation_m": 65.77061731972113,
   "min_gradient_pct": 6.809104914815897,
   "suppressed_max_gradient_pct": 18.798695665458325,
   "suppressed_location_m": [
    177.0,
    277.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.395,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 99.0,
  "shape_class": "sustained"
 },
 "length_m": 277.4999999999923,
 "start_elevation_m": 41.638156579590174,
 "end_elevation_m": 78.44618698325235,
 "endpoint_gain_m": 36.80803040366217,
 "overall_gradient_pct": 13.264155100419169,
 "accumulated_ascent_m": 37.05414526045289,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.4563637466178,
   "start_distance_m": 263.0,
   "end_distance_m": 268.0,
   "midpoint_distance_m": 265.5,
   "start_elevation_m": 74.6034465717071,
   "end_elevation_m": 76.27626475903799,
   "start_xy": [
    251031.72240604213,
    146691.30293748222
   ],
   "end_xy": [
    251026.73298152516,
    146691.62796513113
   ]
  },
  "max_10m": {
   "gradient_pct": 27.32556522294786,
   "start_distance_m": 260.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 73.99757811174723,
   "end_elevation_m": 76.73013463404202,
   "start_xy": [
    251034.71612764633,
    146691.1089556142
   ],
   "end_xy": [
    251024.76589444268,
    146691.5772399057
   ]
  },
  "max_20m": {
   "gradient_pct": 24.913907669834146,
   "start_distance_m": 257.0,
   "end_distance_m": 277.0,
   "midpoint_distance_m": 267.0,
   "start_elevation_m": 73.38674817003572,
   "end_elevation_m": 78.36952970400255,
   "start_xy": [
    251037.7097848922,
    146690.91397793786
   ],
   "end_xy": [
    251020.38657720282,
    146686.19716754666
   ]
  },
  "max_25m": {
   "gradient_pct": 23.812322110646445,
   "start_distance_m": 252.0,
   "end_distance_m": 277.0,
   "midpoint_distance_m": 264.5,
   "start_elevation_m": 72.41644917634093,
   "end_elevation_m": 78.36952970400255,
   "start_xy": [
    251042.69927376753,
    146690.58994609732
   ],
   "end_xy": [
    251020.38657720282,
    146686.19716754666
   ]
  },
  "max_50m": {
   "gradient_pct": 17.020540618368813,
   "start_distance_m": 153.0,
   "end_distance_m": 203.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 55.27489313003956,
   "end_elevation_m": 63.785163439223965,
   "start_xy": [
    251118.10189060977,
    146704.65570060542
   ],
   "end_xy": [
    251090.69103892107,
    146681.83126899076
   ]
  },
  "max_100m": {
   "gradient_pct": 15.406689697303534,
   "start_distance_m": 118.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 168.0,
   "start_elevation_m": 50.36392762241759,
   "end_elevation_m": 65.77061731972113,
   "start_xy": [
    251114.23649138398,
    146739.37748402468
   ],
   "end_xy": [
    251076.184932839,
    146685.64870747263
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.8190480286073409,
   "start_distance_m": 17.0,
   "end_distance_m": 22.0,
   "midpoint_distance_m": 19.5,
   "start_elevation_m": 43.38821641055483,
   "end_elevation_m": 43.347264009124466,
   "start_xy": [
    251098.55190663834,
    146837.69256600467
   ],
   "end_xy": [
    251099.29552128553,
    146832.74817195005
   ]
  },
  "min_10m": {
   "gradient_pct": 0.649095154514896,
   "start_distance_m": 16.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 21.0,
   "start_elevation_m": 43.36389797836598,
   "end_elevation_m": 43.42880749381747,
   "start_xy": [
    251098.78270711686,
    146838.6335782005
   ],
   "end_xy": [
    251099.8899044863,
    146828.7925802888
   ]
  },
  "min_20m": {
   "gradient_pct": 2.261035549917665,
   "start_distance_m": 16.0,
   "end_distance_m": 36.0,
   "midpoint_distance_m": 26.0,
   "start_elevation_m": 43.36389797836598,
   "end_elevation_m": 43.81610508834952,
   "start_xy": [
    251098.78270711686,
    146838.6335782005
   ],
   "end_xy": [
    251100.45900621786,
    146818.92117019361
   ]
  },
  "min_25m": {
   "gradient_pct": 3.465879680565962,
   "start_distance_m": 15.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 27.5,
   "start_elevation_m": 43.268180946404776,
   "end_elevation_m": 44.13465086654627,
   "start_xy": [
    251099.77507942508,
    146838.7284650083
   ],
   "end_xy": [
    251099.6120887572,
    146815.01185714983
   ]
  },
  "min_50m": {
   "gradient_pct": 5.69991209090287,
   "start_distance_m": 16.0,
   "end_distance_m": 66.0,
   "midpoint_distance_m": 41.0,
   "start_elevation_m": 43.36389797836598,
   "end_elevation_m": 46.21385402381742,
   "start_xy": [
    251098.78270711686,
    146838.6335782005
   ],
   "end_xy": [
    251100.73833172,
    146789.44484570465
   ]
  },
  "min_100m": {
   "gradient_pct": 6.809104914815897,
   "start_distance_m": 16.0,
   "end_distance_m": 116.0,
   "midpoint_distance_m": 66.0,
   "start_elevation_m": 43.36389797836598,
   "end_elevation_m": 50.17300289318188,
   "start_xy": [
    251098.78270711686,
    146838.6335782005
   ],
   "end_xy": [
    251113.71427573657,
    146741.30810311958
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 36.066660394212846,
   "start_distance_m": 264.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 74.92810435369363,
   "end_elevation_m": 75.64943756157788,
   "start_xy": [
    251030.7245220462,
    146691.3679569378
   ],
   "end_xy": [
    251028.7287530224,
    146691.49798001355
   ]
  },
  "max_3m": {
   "gradient_pct": 35.9739363734055,
   "start_distance_m": 264.0,
   "end_distance_m": 267.0,
   "midpoint_distance_m": 265.5,
   "start_elevation_m": 74.92810435369363,
   "end_elevation_m": 76.00732244489579,
   "start_xy": [
    251030.7245220462,
    146691.3679569378
   ],
   "end_xy": [
    251027.73086727379,
    146691.56297257234
   ]
  }
 },
 "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": 0.036,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 5.0,
     "start_m": 221.0,
     "end_m": 226.0,
     "raw_pct": 37.57,
     "reason": "short-step"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.057,
   "obstruction_max_height_m": 10.86,
   "flagged_windows_m": [
    100
   ]
  },
  "excluded_ranges_m": [
   [
    219.0,
    228.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "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/dtm_1m/E250000_N146000_2000m.tif"
  ],
  "calculated_at": "2026-09-15T20:38:40+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "retro-260915-dogleg-all",
  "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": [
   "E250000_N146000_2000m.tif"
  ],
  "route_cut_m": 277.5,
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Ilfracombe",
  "county": "Devon"
 }
}