{
 "ocl_version": "0.1.0",
 "name": "Cathole Lane",
 "slug": "cathole-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.20409065327948,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 478.0,
   "end_distance_m": 480.0,
   "start_elevation_m": 138.79941434923364,
   "end_elevation_m": 139.62349616229923,
   "min_gradient_pct": -29.430337449765887,
   "suppressed_max_gradient_pct": 60.49675237358798,
   "suppressed_location_m": [
    610.0,
    612.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.566662354475135,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 477.0,
   "end_distance_m": 480.0,
   "start_elevation_m": 138.40649629166498,
   "end_elevation_m": 139.62349616229923,
   "min_gradient_pct": -25.365594379857725,
   "suppressed_max_gradient_pct": 58.839336117633444,
   "suppressed_location_m": [
    610.0,
    613.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.59016768982974,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 475.0,
   "end_distance_m": 480.0,
   "start_elevation_m": 137.74398777780775,
   "end_elevation_m": 139.62349616229923,
   "min_gradient_pct": -20.908419546388473,
   "suppressed_max_gradient_pct": 47.92200788372725,
   "suppressed_location_m": [
    608.0,
    613.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 34.489204719781696,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 475.0,
   "end_distance_m": 485.0,
   "start_elevation_m": 137.74398777780775,
   "end_elevation_m": 141.19290824978592,
   "min_gradient_pct": -12.355816480237536
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.908874793043935,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 291.0,
   "end_distance_m": 311.0,
   "start_elevation_m": 117.08341362117892,
   "end_elevation_m": 121.46518857978771,
   "min_gradient_pct": -2.730291002819456
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.833152506411125,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 283.0,
   "end_distance_m": 308.0,
   "start_elevation_m": 115.50274276905205,
   "end_elevation_m": 120.96103089565483,
   "min_gradient_pct": -1.4472893755846599
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.014880841219934,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 263.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 112.26862253040285,
   "end_elevation_m": 121.77606295101282,
   "min_gradient_pct": 0.8006801338518699
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.238861554840696,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 74.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 89.63543281585603,
   "end_elevation_m": 104.87429437069673,
   "min_gradient_pct": 1.9628188403366664
  }
 ],
 "shape": {
  "ascent_concentration": 0.363,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 99.0,
  "shape_class": "sustained"
 },
 "length_m": 1128.2339635663413,
 "start_elevation_m": 82.77149490010167,
 "end_elevation_m": 184.61044999603178,
 "endpoint_gain_m": 101.8389550959301,
 "overall_gradient_pct": 9.026403953841074,
 "accumulated_ascent_m": 107.12705480406323,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.59016768982974,
   "start_distance_m": 475.0,
   "end_distance_m": 480.0,
   "midpoint_distance_m": 477.5,
   "start_elevation_m": 137.74398777780775,
   "end_elevation_m": 139.62349616229923,
   "start_xy": [
    331374.6855240405,
    94145.09143710039
   ],
   "end_xy": [
    331369.9256526219,
    94146.62232594297
   ]
  },
  "max_10m": {
   "gradient_pct": 34.489204719781696,
   "start_distance_m": 475.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 480.0,
   "start_elevation_m": 137.74398777780775,
   "end_elevation_m": 141.19290824978592,
   "start_xy": [
    331374.6855240405,
    94145.09143710039
   ],
   "end_xy": [
    331366.5604567776,
    94149.09879725959
   ]
  },
  "max_20m": {
   "gradient_pct": 21.908874793043935,
   "start_distance_m": 291.0,
   "end_distance_m": 311.0,
   "midpoint_distance_m": 301.0,
   "start_elevation_m": 117.08341362117892,
   "end_elevation_m": 121.46518857978771,
   "start_xy": [
    331491.96454543364,
    94284.5469014566
   ],
   "end_xy": [
    331479.70381195925,
    94268.77966109346
   ]
  },
  "max_25m": {
   "gradient_pct": 21.833152506411125,
   "start_distance_m": 283.0,
   "end_distance_m": 308.0,
   "midpoint_distance_m": 295.5,
   "start_elevation_m": 115.50274276905205,
   "end_elevation_m": 120.96103089565483,
   "start_xy": [
    331497.21533714293,
    94290.5825587545
   ],
   "end_xy": [
    331481.4226551498,
    94271.23843668908
   ]
  },
  "max_50m": {
   "gradient_pct": 19.014880841219934,
   "start_distance_m": 263.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 288.0,
   "start_elevation_m": 112.26862253040285,
   "end_elevation_m": 121.77606295101282,
   "start_xy": [
    331512.37998717895,
    94301.46827881725
   ],
   "end_xy": [
    331478.55776002427,
    94267.14058677119
   ]
  },
  "max_100m": {
   "gradient_pct": 15.238861554840696,
   "start_distance_m": 74.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 124.0,
   "start_elevation_m": 89.63543281585603,
   "end_elevation_m": 104.87429437069673,
   "start_xy": [
    331697.720003524,
    94330.03170312343
   ],
   "end_xy": [
    331600.6798696567,
    94310.01580040772
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.908419546388473,
   "start_distance_m": 688.0,
   "end_distance_m": 693.0,
   "midpoint_distance_m": 690.5,
   "start_elevation_m": 158.7640382460648,
   "end_elevation_m": 157.7186172687454,
   "start_xy": [
    331346.1932035066,
    94214.8594019195
   ],
   "end_xy": [
    331343.59518222505,
    94210.58736692769
   ]
  },
  "min_10m": {
   "gradient_pct": -12.355816480237536,
   "start_distance_m": 686.0,
   "end_distance_m": 696.0,
   "midpoint_distance_m": 691.0,
   "start_elevation_m": 158.9138636732819,
   "end_elevation_m": 157.67828202525814,
   "start_xy": [
    331347.2321772511,
    94216.56835874931
   ],
   "end_xy": [
    331342.03631018125,
    94208.02418249
   ]
  },
  "min_20m": {
   "gradient_pct": -2.730291002819456,
   "start_distance_m": 212.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 222.0,
   "start_elevation_m": 109.58466371983016,
   "end_elevation_m": 109.03860551926627,
   "start_xy": [
    331563.34945545386,
    94303.23032202998
   ],
   "end_xy": [
    331543.36044899543,
    94302.56732181685
   ]
  },
  "min_25m": {
   "gradient_pct": -1.4472893755846599,
   "start_distance_m": 212.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 224.5,
   "start_elevation_m": 109.58466371983016,
   "end_elevation_m": 109.222841375934,
   "start_xy": [
    331563.34945545386,
    94303.23032202998
   ],
   "end_xy": [
    331538.36320496857,
    94302.40134611007
   ]
  },
  "min_50m": {
   "gradient_pct": 0.8006801338518699,
   "start_distance_m": 988.0,
   "end_distance_m": 1038.0,
   "midpoint_distance_m": 1013.0,
   "start_elevation_m": 182.02581222360482,
   "end_elevation_m": 182.42615229053075,
   "start_xy": [
    331147.9784974295,
    93997.56555924637
   ],
   "end_xy": [
    331120.93410299113,
    93955.61798426788
   ]
  },
  "min_100m": {
   "gradient_pct": 1.9628188403366664,
   "start_distance_m": 974.0,
   "end_distance_m": 1074.0,
   "midpoint_distance_m": 1024.0,
   "start_elevation_m": 181.75305754249933,
   "end_elevation_m": 183.715876382836,
   "start_xy": [
    331155.63093711383,
    94009.2890462548
   ],
   "end_xy": [
    331092.3863140043,
    93977.2051776894
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.20409065327948,
   "start_distance_m": 478.0,
   "end_distance_m": 480.0,
   "midpoint_distance_m": 479.0,
   "start_elevation_m": 138.79941434923364,
   "end_elevation_m": 139.62349616229923,
   "start_xy": [
    331371.8297097445,
    94146.01030758214
   ],
   "end_xy": [
    331369.9256526219,
    94146.62232594297
   ]
  },
  "max_3m": {
   "gradient_pct": 40.566662354475135,
   "start_distance_m": 477.0,
   "end_distance_m": 480.0,
   "midpoint_distance_m": 478.5,
   "start_elevation_m": 138.40649629166498,
   "end_elevation_m": 139.62349616229923,
   "start_xy": [
    331372.78173830576,
    94145.70429840173
   ],
   "end_xy": [
    331369.9256526219,
    94146.62232594297
   ]
  }
 },
 "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": 0.159,
   "obstruction_max_height_m": 15.88,
   "flagged_windows_m": [
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    608.0,
    613.0
   ]
  ],
  "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/SY3090.tif"
  ],
  "calculated_at": "2026-08-19T22:09:35+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": [
   "SY3090.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.3% over 200 m (Terrain 50), gain 65.8 m over 616 m way. EXTENDED by graph walk: +0 segment(s) at base, +4 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."
 },
 "area": {
  "place": "Yawl",
  "county": "Devon"
 }
}