{
 "ocl_version": "0.1.0",
 "name": "Lane near Buckland",
 "slug": "discovered-lane-50-2822-3-8571",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 54.86677115688252,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 75.0,
   "end_distance_m": 77.0,
   "start_elevation_m": 20.55352361152545,
   "end_elevation_m": 21.6508590346631,
   "min_gradient_pct": -43.91723924440214
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 51.66525678010637,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 75.0,
   "end_distance_m": 78.0,
   "start_elevation_m": 20.55352361152545,
   "end_elevation_m": 22.10348131492864,
   "min_gradient_pct": -40.411767645450425
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 47.10069128942635,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 74.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 20.213327675055304,
   "end_elevation_m": 22.56836223952662,
   "min_gradient_pct": -35.33889637959675
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 39.869523794403214,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 70.0,
   "end_distance_m": 80.0,
   "start_elevation_m": 18.80080080142059,
   "end_elevation_m": 22.78775318086091,
   "min_gradient_pct": -27.77805055480229
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.493878051262463,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 16.869586629274128,
   "end_elevation_m": 22.56836223952662,
   "min_gradient_pct": -24.867700704883262
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.330672617991667,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 55.0,
   "end_distance_m": 80.0,
   "start_elevation_m": 15.705085026362994,
   "end_elevation_m": 22.78775318086091,
   "min_gradient_pct": -25.01081433226278
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.86324447375859,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 30.0,
   "end_distance_m": 80.0,
   "start_elevation_m": 11.856130943981615,
   "end_elevation_m": 22.78775318086091,
   "min_gradient_pct": -24.0494286403804
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.190892919959314,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 54.0,
   "end_distance_m": 154.0,
   "start_elevation_m": 15.591159351189798,
   "end_elevation_m": 35.78205227114911,
   "min_gradient_pct": -20.93075173038946,
   "suppressed_max_gradient_pct": 20.92510681549335,
   "suppressed_location_m": [
    63.0,
    163.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.451,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 201.0,
  "shape_class": "stepped"
 },
 "length_m": 936.6082986096852,
 "start_elevation_m": 9.77327032279883,
 "end_elevation_m": 67.9806707228997,
 "endpoint_gain_m": 58.20740040010087,
 "overall_gradient_pct": 6.214700476870082,
 "accumulated_ascent_m": 91.22269465467892,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 47.10069128942635,
   "start_distance_m": 74.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 76.5,
   "start_elevation_m": 20.213327675055304,
   "end_elevation_m": 22.56836223952662,
   "start_xy": [
    267613.78344729403,
    43635.63050576502
   ],
   "end_xy": [
    267610.3958644327,
    43639.30804330488
   ]
  },
  "max_10m": {
   "gradient_pct": 39.869523794403214,
   "start_distance_m": 70.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 75.0,
   "start_elevation_m": 18.80080080142059,
   "end_elevation_m": 22.78775318086091,
   "start_xy": [
    267616.4935135832,
    43632.68847573312
   ],
   "end_xy": [
    267609.7183478604,
    43640.04355081285
   ]
  },
  "max_20m": {
   "gradient_pct": 28.493878051262463,
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 69.0,
   "start_elevation_m": 16.869586629274128,
   "end_elevation_m": 22.56836223952662,
   "start_xy": [
    267623.8877303718,
    43624.547189148594
   ],
   "end_xy": [
    267610.3958644327,
    43639.30804330488
   ]
  },
  "max_25m": {
   "gradient_pct": 28.330672617991667,
   "start_distance_m": 55.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 67.5,
   "start_elevation_m": 15.705085026362994,
   "end_elevation_m": 22.78775318086091,
   "start_xy": [
    267626.4167567335,
    43621.44815290136
   ],
   "end_xy": [
    267609.7183478604,
    43640.04355081285
   ]
  },
  "max_50m": {
   "gradient_pct": 21.86324447375859,
   "start_distance_m": 30.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 55.0,
   "start_elevation_m": 11.856130943981615,
   "end_elevation_m": 22.78775318086091,
   "start_xy": [
    267642.2231714943,
    43602.07917635614
   ],
   "end_xy": [
    267609.7183478604,
    43640.04355081285
   ]
  },
  "max_100m": {
   "gradient_pct": 20.190892919959314,
   "start_distance_m": 54.0,
   "end_distance_m": 154.0,
   "midpoint_distance_m": 104.0,
   "start_elevation_m": 15.591159351189798,
   "end_elevation_m": 35.78205227114911,
   "start_xy": [
    267627.0490133239,
    43620.67339383955
   ],
   "end_xy": [
    267571.47147152293,
    43684.03033527894
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -35.33889637959675,
   "start_distance_m": 929.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 931.5,
   "start_elevation_m": 70.0437446018934,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267802.80190221604,
    44397.43633872839
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  },
  "min_10m": {
   "gradient_pct": -27.77805055480229,
   "start_distance_m": 924.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 929.0,
   "start_elevation_m": 71.05460483839379,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267802.3536431381,
    44392.45647288692
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  },
  "min_20m": {
   "gradient_pct": -24.867700704883262,
   "start_distance_m": 914.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 924.0,
   "start_elevation_m": 73.25033992389021,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267801.4585539898,
    44382.496612676645
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  },
  "min_25m": {
   "gradient_pct": -25.01081433226278,
   "start_distance_m": 909.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 921.5,
   "start_elevation_m": 74.52950336597925,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267801.011012331,
    44377.516682309295
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  },
  "min_50m": {
   "gradient_pct": -24.0494286403804,
   "start_distance_m": 884.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 909.0,
   "start_elevation_m": 80.30151410310376,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267798.75706516625,
    44352.61853551233
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  },
  "min_100m": {
   "gradient_pct": -20.93075173038946,
   "start_distance_m": 834.0,
   "end_distance_m": 934.0,
   "midpoint_distance_m": 884.0,
   "start_elevation_m": 89.20755151330302,
   "end_elevation_m": 68.27679978291356,
   "start_xy": [
    267797.5672582461,
    44302.677138756895
   ],
   "end_xy": [
    267803.250161294,
    44402.41620456986
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 54.86677115688252,
   "start_distance_m": 75.0,
   "end_distance_m": 77.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 20.55352361152545,
   "end_elevation_m": 21.6508590346631,
   "start_xy": [
    267613.1059307218,
    43636.366013272986
   ],
   "end_xy": [
    267611.7508975772,
    43637.83702828894
   ]
  },
  "max_3m": {
   "gradient_pct": 51.66525678010637,
   "start_distance_m": 75.0,
   "end_distance_m": 78.0,
   "midpoint_distance_m": 76.5,
   "start_elevation_m": 20.55352361152545,
   "end_elevation_m": 22.10348131492864,
   "start_xy": [
    267613.1059307218,
    43636.366013272986
   ],
   "end_xy": [
    267611.0733810049,
    43638.572535796906
   ]
  }
 },
 "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": 0.085,
   "obstruction_max_height_m": 9.56,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.029,
   "windows_resited": [
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    20.0
   ],
   [
    155.0,
    160.0
   ]
  ],
  "review": [
   "max5_over_45"
  ],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 731.0,
  "trailing_descent_m": 32.0
 },
 "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/SX6540.tif"
  ],
  "calculated_at": "2026-08-15T00:59:02+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": [
   "SX6540.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.2% over 200 m (Terrain 50), gain 36.8 m over 796 m way. EXTENDED by graph walk: +3 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-50-2779-3-8595",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.2822, -3.8571)'"
 },
 "area": {
  "place": "Buckland",
  "county": "Devon"
 }
}