{
 "ocl_version": "0.1.0",
 "name": "North Bird's Hill to Monksilver",
 "slug": "discovered-lane-51-1243-3-3198",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.95608086977296,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 91.0,
   "end_distance_m": 93.0,
   "start_elevation_m": 109.80731671719445,
   "end_elevation_m": 110.66643833458991,
   "min_gradient_pct": -24.81781462864987
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.43607369917655,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 90.0,
   "end_distance_m": 93.0,
   "start_elevation_m": 109.57335612361462,
   "end_elevation_m": 110.66643833458991,
   "min_gradient_pct": -21.7074891720434
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 36.323243636377356,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 87.0,
   "end_distance_m": 92.0,
   "start_elevation_m": 108.48749376308533,
   "end_elevation_m": 110.3036559449042,
   "min_gradient_pct": -18.40883884929866
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.073445018330915,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 83.0,
   "end_distance_m": 93.0,
   "start_elevation_m": 107.45909383275682,
   "end_elevation_m": 110.66643833458991,
   "min_gradient_pct": -12.041703666391044
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.33865334195001,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 77.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 106.10222514633182,
   "end_elevation_m": 111.36995581472182,
   "min_gradient_pct": -8.435694463465992
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.621342955424726,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 105.72290242112419,
   "end_elevation_m": 111.62823815998037,
   "min_gradient_pct": -7.067391026715825
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.422421636025064,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 49.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 103.41702734196784,
   "end_elevation_m": 111.62823815998037,
   "min_gradient_pct": -4.638589780881489
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.69314998982965,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 273.0,
   "end_distance_m": 373.0,
   "start_elevation_m": 117.330965512768,
   "end_elevation_m": 131.02411550259765,
   "min_gradient_pct": -1.2404255827574673
  }
 ],
 "shape": {
  "ascent_concentration": 0.374,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 143.0,
  "shape_class": "sustained"
 },
 "length_m": 595.6204448421383,
 "start_elevation_m": 102.38878848895513,
 "end_elevation_m": 150.06248894555713,
 "endpoint_gain_m": 47.673700456602006,
 "overall_gradient_pct": 8.004040302753094,
 "accumulated_ascent_m": 52.67071277351232,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 36.323243636377356,
   "start_distance_m": 87.0,
   "end_distance_m": 92.0,
   "midpoint_distance_m": 89.5,
   "start_elevation_m": 108.48749376308533,
   "end_elevation_m": 110.3036559449042,
   "start_xy": [
    307664.68335602334,
    136742.09517634314
   ],
   "end_xy": [
    307667.22060172074,
    136746.4035848975
   ]
  },
  "max_10m": {
   "gradient_pct": 32.073445018330915,
   "start_distance_m": 83.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 88.0,
   "start_elevation_m": 107.45909383275682,
   "end_elevation_m": 110.66643833458991,
   "start_xy": [
    307662.2274971055,
    136738.94448330475
   ],
   "end_xy": [
    307667.72805086017,
    136747.26526660836
   ]
  },
  "max_20m": {
   "gradient_pct": 26.33865334195001,
   "start_distance_m": 77.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 87.0,
   "start_elevation_m": 106.10222514633182,
   "end_elevation_m": 111.36995581472182,
   "start_xy": [
    307658.14120985253,
    136734.64002001387
   ],
   "end_xy": [
    307669.16135913547,
    136750.9751233796
   ]
  },
  "max_25m": {
   "gradient_pct": 23.621342955424726,
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 86.5,
   "start_elevation_m": 105.72290242112419,
   "end_elevation_m": 111.62823815998037,
   "start_xy": [
    307655.555392973,
    136733.1189838323
   ],
   "end_xy": [
    307669.7498912263,
    136752.88657046968
   ]
  },
  "max_50m": {
   "gradient_pct": 16.422421636025064,
   "start_distance_m": 49.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 74.0,
   "start_elevation_m": 103.41702734196784,
   "end_elevation_m": 111.62823815998037,
   "start_xy": [
    307643.8716307729,
    136712.3581067369
   ],
   "end_xy": [
    307669.7498912263,
    136752.88657046968
   ]
  },
  "max_100m": {
   "gradient_pct": 13.69314998982965,
   "start_distance_m": 273.0,
   "end_distance_m": 373.0,
   "midpoint_distance_m": 323.0,
   "start_elevation_m": 117.330965512768,
   "end_elevation_m": 131.02411550259765,
   "start_xy": [
    307676.8488998943,
    136925.522194437
   ],
   "end_xy": [
    307769.15347127465,
    136940.3336711393
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.40883884929866,
   "start_distance_m": 160.0,
   "end_distance_m": 165.0,
   "midpoint_distance_m": 162.5,
   "start_elevation_m": 110.40237215207559,
   "end_elevation_m": 109.48193020961065,
   "start_xy": [
    307677.6926655897,
    136813.1276823889
   ],
   "end_xy": [
    307677.47977029084,
    136818.12314789192
   ]
  },
  "min_10m": {
   "gradient_pct": -12.041703666391044,
   "start_distance_m": 116.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 121.0,
   "start_elevation_m": 111.72595869407652,
   "end_elevation_m": 110.52178832743742,
   "start_xy": [
    307673.6497211406,
    136769.40112096124
   ],
   "end_xy": [
    307675.40917196,
    136779.2451207994
   ]
  },
  "min_20m": {
   "gradient_pct": -8.435694463465992,
   "start_distance_m": 112.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 111.89139608377184,
   "end_elevation_m": 110.20425719107864,
   "start_xy": [
    307672.9459408128,
    136765.46352102596
   ],
   "end_xy": [
    307676.2576438879,
    136785.17619532737
   ]
  },
  "min_25m": {
   "gradient_pct": -7.067391026715825,
   "start_distance_m": 110.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 122.5,
   "start_elevation_m": 111.90762765641192,
   "end_elevation_m": 110.14077989973296,
   "start_xy": [
    307672.594050649,
    136763.49472105832
   ],
   "end_xy": [
    307676.43810950714,
    136788.1707624347
   ]
  },
  "min_50m": {
   "gradient_pct": -4.638589780881489,
   "start_distance_m": 116.0,
   "end_distance_m": 166.0,
   "midpoint_distance_m": 141.0,
   "start_elevation_m": 111.72595869407652,
   "end_elevation_m": 109.40666380363578,
   "start_xy": [
    307673.6497211406,
    136769.40112096124
   ],
   "end_xy": [
    307677.43719123106,
    136819.12224099252
   ]
  },
  "min_100m": {
   "gradient_pct": -1.2404255827574673,
   "start_distance_m": 105.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 155.0,
   "start_elevation_m": 112.06195317357832,
   "end_elevation_m": 110.82152759082085,
   "start_xy": [
    307671.51548749866,
    136758.62091173988
   ],
   "end_xy": [
    307675.77660790004,
    136858.08687191596
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.95608086977296,
   "start_distance_m": 91.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 92.0,
   "start_elevation_m": 109.80731671719445,
   "end_elevation_m": 110.66643833458991,
   "start_xy": [
    307666.71315258124,
    136745.54190318662
   ],
   "end_xy": [
    307667.72805086017,
    136747.26526660836
   ]
  },
  "max_3m": {
   "gradient_pct": 36.43607369917655,
   "start_distance_m": 90.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 91.5,
   "start_elevation_m": 109.57335612361462,
   "end_elevation_m": 110.66643833458991,
   "start_xy": [
    307666.20570344175,
    136744.68022147575
   ],
   "end_xy": [
    307667.72805086017,
    136747.26526660836
   ]
  }
 },
 "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": 0.137,
   "obstruction_max_height_m": 17.82,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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/ST0535.tif"
  ],
  "calculated_at": "2026-08-15T05:10:44+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": [
   "ST0535.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.3% over 200 m (Terrain 50), gain 44.3 m over 528 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 (51.1243, -3.3198)'"
 },
 "area": {
  "place": "Monksilver",
  "county": "Somerset"
 }
}