{
 "ocl_version": "0.1.0",
 "name": "Bickham to North Huish",
 "slug": "discovered-lane-50-3893-3-8109",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 49.91058390340015,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2109.0,
   "end_distance_m": 2111.0,
   "start_elevation_m": 115.07131632619165,
   "end_elevation_m": 116.06952800425965,
   "min_gradient_pct": -44.618020352626075
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 45.01795996671044,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 2109.0,
   "end_distance_m": 2112.0,
   "start_elevation_m": 115.07131632619165,
   "end_elevation_m": 116.42185512519296,
   "min_gradient_pct": -42.80923431961744
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.85076290139827,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 78.0,
   "end_distance_m": 83.0,
   "start_elevation_m": 57.212601878800605,
   "end_elevation_m": 59.10514002387052,
   "min_gradient_pct": -33.11524709212847
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.66646038997061,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 130.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 68.41830339226954,
   "end_elevation_m": 71.2849494312666,
   "min_gradient_pct": -23.190088146864127
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.92749181594928,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 142.0,
   "start_elevation_m": 66.19249777828654,
   "end_elevation_m": 71.7779961414764,
   "min_gradient_pct": -18.338920145005915
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.253272120957437,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 147.0,
   "start_elevation_m": 66.19249777828654,
   "end_elevation_m": 73.0058158085259,
   "min_gradient_pct": -18.188796770099486
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.194701939535847,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 98.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 61.63387765406389,
   "end_elevation_m": 73.23122862383181,
   "min_gradient_pct": -17.1756509053875
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.116095400343887,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 69.0,
   "end_distance_m": 169.0,
   "start_elevation_m": 55.54474494646872,
   "end_elevation_m": 76.6608403468126,
   "min_gradient_pct": -15.559017385974016
  }
 ],
 "shape": {
  "ascent_concentration": 0.421,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 190.0,
  "shape_class": "sustained"
 },
 "length_m": 2222.762807423516,
 "start_elevation_m": 48.743087158203366,
 "end_elevation_m": 126.63025579630158,
 "endpoint_gain_m": 77.88716863809822,
 "overall_gradient_pct": 3.5040701768975535,
 "accumulated_ascent_m": 142.2191129658413,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.85076290139827,
   "start_distance_m": 78.0,
   "end_distance_m": 83.0,
   "midpoint_distance_m": 80.5,
   "start_elevation_m": 57.212601878800605,
   "end_elevation_m": 59.10514002387052,
   "start_xy": [
    272352.2092459213,
    55209.906603692536
   ],
   "end_xy": [
    272347.24907727516,
    55210.53646637776
   ]
  },
  "max_10m": {
   "gradient_pct": 28.66646038997061,
   "start_distance_m": 130.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 135.0,
   "start_elevation_m": 68.41830339226954,
   "end_elevation_m": 71.2849494312666,
   "start_xy": [
    272300.65702881257,
    55214.126031458574
   ],
   "end_xy": [
    272290.7777736882,
    55212.5767385045
   ]
  },
  "max_20m": {
   "gradient_pct": 27.92749181594928,
   "start_distance_m": 122.0,
   "end_distance_m": 142.0,
   "midpoint_distance_m": 132.0,
   "start_elevation_m": 66.19249777828654,
   "end_elevation_m": 71.7779961414764,
   "start_xy": [
    272308.56102350884,
    55215.36169639762
   ],
   "end_xy": [
    272288.8019845187,
    55212.266485127846
   ]
  },
  "max_25m": {
   "gradient_pct": 27.253272120957437,
   "start_distance_m": 122.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 134.5,
   "start_elevation_m": 66.19249777828654,
   "end_elevation_m": 73.0058158085259,
   "start_xy": [
    272308.56102350884,
    55215.36169639762
   ],
   "end_xy": [
    272283.86251159495,
    55211.49085168623
   ]
  },
  "max_50m": {
   "gradient_pct": 23.194701939535847,
   "start_distance_m": 98.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 61.63387765406389,
   "end_elevation_m": 73.23122862383181,
   "start_xy": [
    272332.3685713369,
    55212.42605443342
   ],
   "end_xy": [
    272282.8746170102,
    55211.3357249979
   ]
  },
  "max_100m": {
   "gradient_pct": 21.116095400343887,
   "start_distance_m": 69.0,
   "end_distance_m": 169.0,
   "midpoint_distance_m": 119.0,
   "start_elevation_m": 55.54474494646872,
   "end_elevation_m": 76.6608403468126,
   "start_xy": [
    272360.6684296205,
    55207.27892346535
   ],
   "end_xy": [
    272262.50183091994,
    55206.74373531163
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -33.11524709212847,
   "start_distance_m": 1921.0,
   "end_distance_m": 1926.0,
   "midpoint_distance_m": 1923.5,
   "start_elevation_m": 97.26125916321162,
   "end_elevation_m": 95.6054968086052,
   "start_xy": [
    271185.0822915625,
    56290.47695238304
   ],
   "end_xy": [
    271182.0589727572,
    56294.45935660681
   ]
  },
  "min_10m": {
   "gradient_pct": -23.190088146864127,
   "start_distance_m": 1917.0,
   "end_distance_m": 1927.0,
   "midpoint_distance_m": 1922.0,
   "start_elevation_m": 97.75652371131939,
   "end_elevation_m": 95.43751489663298,
   "start_xy": [
    271187.50094660674,
    56287.29102900403
   ],
   "end_xy": [
    271181.45416447264,
    56295.255727694166
   ]
  },
  "min_20m": {
   "gradient_pct": -18.338920145005915,
   "start_distance_m": 750.0,
   "end_distance_m": 770.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 91.88078838779077,
   "end_elevation_m": 88.21300435878959,
   "start_xy": [
    271805.2446269798,
    55419.92137535551
   ],
   "end_xy": [
    271788.4938514711,
    55430.84893317307
   ]
  },
  "min_25m": {
   "gradient_pct": -18.188796770099486,
   "start_distance_m": 745.0,
   "end_distance_m": 770.0,
   "midpoint_distance_m": 757.5,
   "start_elevation_m": 92.76020355131446,
   "end_elevation_m": 88.21300435878959,
   "start_xy": [
    271809.432320857,
    55417.189485901115
   ],
   "end_xy": [
    271788.4938514711,
    55430.84893317307
   ]
  },
  "min_50m": {
   "gradient_pct": -17.1756509053875,
   "start_distance_m": 735.0,
   "end_distance_m": 785.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 94.30925892840332,
   "end_elevation_m": 85.72143347570957,
   "start_xy": [
    271817.80770861136,
    55411.725706992336
   ],
   "end_xy": [
    271775.93076983956,
    55439.04460153624
   ]
  },
  "min_100m": {
   "gradient_pct": -15.559017385974016,
   "start_distance_m": 735.0,
   "end_distance_m": 835.0,
   "midpoint_distance_m": 785.0,
   "start_elevation_m": 94.30925892840332,
   "end_elevation_m": 78.75024154242931,
   "start_xy": [
    271817.80770861136,
    55411.725706992336
   ],
   "end_xy": [
    271734.0538310677,
    55466.36349608014
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 49.91058390340015,
   "start_distance_m": 2109.0,
   "end_distance_m": 2111.0,
   "midpoint_distance_m": 2110.0,
   "start_elevation_m": 115.07131632619165,
   "end_elevation_m": 116.06952800425965,
   "start_xy": [
    271288.7644779398,
    56334.34579101638
   ],
   "end_xy": [
    271290.33707726584,
    56335.5814816572
   ]
  },
  "max_3m": {
   "gradient_pct": 45.01795996671044,
   "start_distance_m": 2109.0,
   "end_distance_m": 2112.0,
   "midpoint_distance_m": 2110.5,
   "start_elevation_m": 115.07131632619165,
   "end_elevation_m": 116.42185512519296,
   "start_xy": [
    271288.7644779398,
    56334.34579101638
   ],
   "end_xy": [
    271291.12337692885,
    56336.19932697762
   ]
  }
 },
 "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": 0.193,
   "obstruction_max_height_m": 19.95,
   "flagged_windows_m": [
    50,
    100
   ]
  },
  "no_bench_suppression": {
   "masked_fraction": 0.027,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    1780.0,
    1840.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/SX7055.tif"
  ],
  "calculated_at": "2026-08-20T19:19:48+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": [
   "SX7055.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.2% over 200 m (Terrain 50), gain 21.6 m over 1621 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 (50.3893, -3.8109)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.3893, -3.8109)'",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Bickham",
  "county": "Devon"
 }
}