{
 "ocl_version": "0.1.0",
 "name": "Guildford Lane",
 "slug": "guildford-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 54.11994013552217,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 79.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 65.83701774672167,
   "end_elevation_m": 66.91941654943211,
   "min_gradient_pct": -31.334358381925398
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 51.7149344580389,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 78.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 65.36796851569095,
   "end_elevation_m": 66.91941654943211,
   "min_gradient_pct": -25.971569890876367
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 44.84742805557744,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 77.0,
   "end_distance_m": 82.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 67.32100731050767,
   "min_gradient_pct": -18.6242385108946
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 39.406744924225166,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 77.0,
   "end_distance_m": 87.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 69.01931040015131,
   "min_gradient_pct": -11.466255246790666
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 29.183986180554268,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 77.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 70.91543314383965,
   "min_gradient_pct": -5.482987135989603
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.5219863770381,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 75.0,
   "end_distance_m": 100.0,
   "start_elevation_m": 64.8033403127126,
   "end_elevation_m": 71.43383690697213,
   "min_gradient_pct": -5.1434469225750945
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.93939614180178,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 77.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 73.54833397862969,
   "min_gradient_pct": -3.794586594353717
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.321137987289205,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 45.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 63.23327210062243,
   "end_elevation_m": 75.55441008791163,
   "min_gradient_pct": -3.1001022026700866
  }
 ],
 "shape": {
  "ascent_concentration": 0.426,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 46.0,
  "shape_class": "sustained"
 },
 "length_m": 1243.7360916621567,
 "start_elevation_m": 60.98917783298453,
 "end_elevation_m": 112.42827465362552,
 "endpoint_gain_m": 51.43909682064099,
 "overall_gradient_pct": 4.135853029069586,
 "accumulated_ascent_m": 62.47182538604273,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 44.84742805557744,
   "start_distance_m": 77.0,
   "end_distance_m": 82.0,
   "midpoint_distance_m": 79.5,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 67.32100731050767,
   "start_xy": [
    504604.39068103075,
    147990.4747599683
   ],
   "end_xy": [
    504601.9194332301,
    147994.82135977736
   ]
  },
  "max_10m": {
   "gradient_pct": 39.406744924225166,
   "start_distance_m": 77.0,
   "end_distance_m": 87.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 69.01931040015131,
   "start_xy": [
    504604.39068103075,
    147990.4747599683
   ],
   "end_xy": [
    504599.447842671,
    147999.16776461308
   ]
  },
  "max_20m": {
   "gradient_pct": 29.183986180554268,
   "start_distance_m": 77.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 87.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 70.91543314383965,
   "start_xy": [
    504604.39068103075,
    147990.4747599683
   ],
   "end_xy": [
    504594.5057064758,
    148007.86116875714
   ]
  },
  "max_25m": {
   "gradient_pct": 26.5219863770381,
   "start_distance_m": 75.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 87.5,
   "start_elevation_m": 64.8033403127126,
   "end_elevation_m": 71.43383690697213,
   "start_xy": [
    504605.3787723879,
    147988.7358882488
   ],
   "end_xy": [
    504593.02341632807,
    148010.46938948394
   ]
  },
  "max_50m": {
   "gradient_pct": 16.93939614180178,
   "start_distance_m": 77.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 102.0,
   "start_elevation_m": 65.0786359077288,
   "end_elevation_m": 73.54833397862969,
   "start_xy": [
    504604.39068103075,
    147990.4747599683
   ],
   "end_xy": [
    504579.6797504082,
    148033.9416381722
   ]
  },
  "max_100m": {
   "gradient_pct": 12.321137987289205,
   "start_distance_m": 45.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 95.0,
   "start_elevation_m": 63.23327210062243,
   "end_elevation_m": 75.55441008791163,
   "start_xy": [
    504629.45257754193,
    147980.62877380662
   ],
   "end_xy": [
    504570.2863793903,
    148049.22385417015
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.6242385108946,
   "start_distance_m": 150.0,
   "end_distance_m": 155.0,
   "midpoint_distance_m": 152.5,
   "start_elevation_m": 75.6303911789909,
   "end_elevation_m": 74.69917925344618,
   "start_xy": [
    504566.7996855936,
    148052.80756221976
   ],
   "end_xy": [
    504563.3130681452,
    148056.39134453353
   ]
  },
  "min_10m": {
   "gradient_pct": -11.466255246790666,
   "start_distance_m": 147.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 152.0,
   "start_elevation_m": 75.5583399644939,
   "end_elevation_m": 74.41171443981483,
   "start_xy": [
    504568.89180592424,
    148050.65743861362
   ],
   "end_xy": [
    504561.9179838013,
    148057.82443129766
   ]
  },
  "min_20m": {
   "gradient_pct": -5.482987135989603,
   "start_distance_m": 915.0,
   "end_distance_m": 935.0,
   "midpoint_distance_m": 925.0,
   "start_elevation_m": 109.88659830187582,
   "end_elevation_m": 108.7900008746779,
   "start_xy": [
    503873.1363374335,
    148363.1388722278
   ],
   "end_xy": [
    503853.75856758485,
    148368.08881610582
   ]
  },
  "min_25m": {
   "gradient_pct": -5.1434469225750945,
   "start_distance_m": 915.0,
   "end_distance_m": 940.0,
   "midpoint_distance_m": 927.5,
   "start_elevation_m": 109.88659830187582,
   "end_elevation_m": 108.60073657123205,
   "start_xy": [
    503873.1363374335,
    148363.1388722278
   ],
   "end_xy": [
    503848.9140227706,
    148369.325901293
   ]
  },
  "min_50m": {
   "gradient_pct": -3.794586594353717,
   "start_distance_m": 899.0,
   "end_distance_m": 949.0,
   "midpoint_distance_m": 924.0,
   "start_elevation_m": 110.1673612421933,
   "end_elevation_m": 108.27006794501644,
   "start_xy": [
    503887.53430903726,
    148356.18076822354
   ],
   "end_xy": [
    503840.19410399836,
    148371.55367937297
   ]
  },
  "min_100m": {
   "gradient_pct": -3.1001022026700866,
   "start_distance_m": 860.0,
   "end_distance_m": 960.0,
   "midpoint_distance_m": 910.0,
   "start_elevation_m": 111.1520160724212,
   "end_elevation_m": 108.05191386975112,
   "start_xy": [
    503924.1776725027,
    148342.85958531484
   ],
   "end_xy": [
    503829.5362523708,
    148374.27584253048
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 54.11994013552217,
   "start_distance_m": 79.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 80.0,
   "start_elevation_m": 65.83701774672167,
   "end_elevation_m": 66.91941654943211,
   "start_xy": [
    504603.401723352,
    147992.21313903588
   ],
   "end_xy": [
    504602.4136854262,
    147993.95204122394
   ]
  },
  "max_3m": {
   "gradient_pct": 51.7149344580389,
   "start_distance_m": 78.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 79.5,
   "start_elevation_m": 65.36796851569095,
   "end_elevation_m": 66.91941654943211,
   "start_xy": [
    504603.8958511165,
    147991.34374975663
   ],
   "end_xy": [
    504602.4136854262,
    147993.95204122394
   ]
  }
 },
 "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": 0.14,
   "obstruction_max_height_m": 14.53,
   "flagged_windows_m": [
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "descends_at_end"
  ]
 },
 "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/TQ0045.tif"
  ],
  "calculated_at": "2026-08-19T18:35:30+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": [
   "TQ0045.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.9% over 200 m (Terrain 50), gain 47.6 m over 1181 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): qualified-steep."
 },
 "area": {
  "place": "Albury",
  "county": "Surrey"
 }
}