{
 "ocl_version": "0.1.0",
 "name": "Lane near Buckfast",
 "slug": "discovered-lane-50-4895-3-7593",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.86887010458025,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 363.0,
   "end_distance_m": 365.0,
   "start_elevation_m": 106.62570087134617,
   "end_elevation_m": 107.60307827343777,
   "min_gradient_pct": -22.960317523263996
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 48.74413352015571,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 362.0,
   "end_distance_m": 365.0,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 107.60307827343777,
   "min_gradient_pct": -17.459578898374655
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.94002591528846,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 362.0,
   "end_distance_m": 367.0,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 108.08775556359753,
   "min_gradient_pct": -11.324386718021628
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.273615820305025,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 362.0,
   "end_distance_m": 372.0,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 109.2681158498636,
   "min_gradient_pct": -5.502276698048689
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.940804275841273,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 352.0,
   "end_distance_m": 372.0,
   "start_elevation_m": 104.67995499469535,
   "end_elevation_m": 109.2681158498636,
   "min_gradient_pct": -2.4337965484954793
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.550934280512934,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 347.0,
   "end_distance_m": 372.0,
   "start_elevation_m": 103.88038227973537,
   "end_elevation_m": 109.2681158498636,
   "min_gradient_pct": -2.313916695392493
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.995538472852985,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 322.0,
   "end_distance_m": 372.0,
   "start_elevation_m": 100.77034661343711,
   "end_elevation_m": 109.2681158498636,
   "min_gradient_pct": -1.0998869290140476
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.355096459867283,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 272.0,
   "end_distance_m": 372.0,
   "start_elevation_m": 95.91301938999632,
   "end_elevation_m": 109.2681158498636,
   "min_gradient_pct": 0.2512345954620372
  }
 ],
 "shape": {
  "ascent_concentration": 0.408,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 60.0,
  "shape_class": "sustained"
 },
 "length_m": 580.074835655473,
 "start_elevation_m": 83.2586689553808,
 "end_elevation_m": 119.68784559759509,
 "endpoint_gain_m": 36.42917664221429,
 "overall_gradient_pct": 6.280082224399555,
 "accumulated_ascent_m": 41.97551279328896,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.94002591528846,
   "start_distance_m": 362.0,
   "end_distance_m": 367.0,
   "midpoint_distance_m": 364.5,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 108.08775556359753,
   "start_xy": [
    275266.6222051982,
    66985.20737791724
   ],
   "end_xy": [
    275261.76687262964,
    66986.40142226494
   ]
  },
  "max_10m": {
   "gradient_pct": 31.273615820305025,
   "start_distance_m": 362.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 367.0,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 109.2681158498636,
   "start_xy": [
    275266.6222051982,
    66985.20737791724
   ],
   "end_xy": [
    275256.9115003676,
    66987.59530526481
   ]
  },
  "max_20m": {
   "gradient_pct": 22.940804275841273,
   "start_distance_m": 352.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 362.0,
   "start_elevation_m": 104.67995499469535,
   "end_elevation_m": 109.2681158498636,
   "start_xy": [
    275276.31249722873,
    66985.84969351736
   ],
   "end_xy": [
    275256.9115003676,
    66987.59530526481
   ]
  },
  "max_25m": {
   "gradient_pct": 21.550934280512934,
   "start_distance_m": 347.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 359.5,
   "start_elevation_m": 103.88038227973537,
   "end_elevation_m": 109.2681158498636,
   "start_xy": [
    275280.7113821175,
    66988.19720329343
   ],
   "end_xy": [
    275256.9115003676,
    66987.59530526481
   ]
  },
  "max_50m": {
   "gradient_pct": 16.995538472852985,
   "start_distance_m": 322.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 347.0,
   "start_elevation_m": 100.77034661343711,
   "end_elevation_m": 109.2681158498636,
   "start_xy": [
    275300.2882861691,
    67003.64352829858
   ],
   "end_xy": [
    275256.9115003676,
    66987.59530526481
   ]
  },
  "max_100m": {
   "gradient_pct": 13.355096459867283,
   "start_distance_m": 272.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 322.0,
   "start_elevation_m": 95.91301938999632,
   "end_elevation_m": 109.2681158498636,
   "start_xy": [
    275329.66652208136,
    67043.51011621275
   ],
   "end_xy": [
    275256.9115003676,
    66987.59530526481
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -11.324386718021628,
   "start_distance_m": 407.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 409.5,
   "start_elevation_m": 110.18726500434728,
   "end_elevation_m": 109.6210456684462,
   "start_xy": [
    275223.1278660442,
    66996.7057665122
   ],
   "end_xy": [
    275218.2747520872,
    66997.90879479608
   ]
  },
  "min_10m": {
   "gradient_pct": -5.502276698048689,
   "start_distance_m": 402.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 407.0,
   "start_elevation_m": 110.17127333825107,
   "end_elevation_m": 109.6210456684462,
   "start_xy": [
    275227.94024153956,
    66995.35236238124
   ],
   "end_xy": [
    275218.2747520872,
    66997.90879479608
   ]
  },
  "min_20m": {
   "gradient_pct": -2.4337965484954793,
   "start_distance_m": 48.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 58.0,
   "start_elevation_m": 85.11372010861241,
   "end_elevation_m": 84.62696079891332,
   "start_xy": [
    275489.67243649036,
    67190.7594258433
   ],
   "end_xy": [
    275474.6852322961,
    67177.51617625143
   ]
  },
  "min_25m": {
   "gradient_pct": -2.313916695392493,
   "start_distance_m": 46.0,
   "end_distance_m": 71.0,
   "midpoint_distance_m": 58.5,
   "start_elevation_m": 85.15706410258547,
   "end_elevation_m": 84.57858492873734,
   "start_xy": [
    275491.17094866576,
    67192.08398662055
   ],
   "end_xy": [
    275472.3978955876,
    67175.57680417792
   ]
  },
  "min_50m": {
   "gradient_pct": -1.0998869290140476,
   "start_distance_m": 46.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 71.0,
   "start_elevation_m": 85.15706410258547,
   "end_elevation_m": 84.60712063807844,
   "start_xy": [
    275491.17094866576,
    67192.08398662055
   ],
   "end_xy": [
    275452.5571057218,
    67160.3668428557
   ]
  },
  "min_100m": {
   "gradient_pct": 0.2512345954620372,
   "start_distance_m": 21.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 71.0,
   "start_elevation_m": 84.84236778455765,
   "end_elevation_m": 85.09360238001969,
   "start_xy": [
    275509.9045400685,
    67208.63851739033
   ],
   "end_xy": [
    275432.71660121565,
    67145.15650899288
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.86887010458025,
   "start_distance_m": 363.0,
   "end_distance_m": 365.0,
   "midpoint_distance_m": 364.0,
   "start_elevation_m": 106.62570087134617,
   "end_elevation_m": 107.60307827343777,
   "start_xy": [
    275265.65115148126,
    66985.44623887484
   ],
   "end_xy": [
    275263.70891822973,
    66985.92344855108
   ]
  },
  "max_3m": {
   "gradient_pct": 48.74413352015571,
   "start_distance_m": 362.0,
   "end_distance_m": 365.0,
   "midpoint_distance_m": 363.5,
   "start_elevation_m": 106.1407542678331,
   "end_elevation_m": 107.60307827343777,
   "start_xy": [
    275266.6222051982,
    66985.20737791724
   ],
   "end_xy": [
    275263.70891822973,
    66985.92344855108
   ]
  }
 },
 "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": 0.132,
   "obstruction_max_height_m": 11.69,
   "flagged_windows_m": []
  },
  "review": [],
  "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/SX7565.tif"
  ],
  "calculated_at": "2026-08-19T18:12:56+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": [
   "SX7565.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.8% over 200 m (Terrain 50), gain 33.3 m over 560 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. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (50.4895, -3.7593)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4895, -3.7593)'"
 },
 "area": {
  "place": "Buckfastleigh",
  "county": "Devon"
 }
}