{
 "ocl_version": "0.1.0",
 "name": "Leashaw Road",
 "slug": "leashaw-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.04975670068714,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 902.0,
   "end_distance_m": 904.0,
   "start_elevation_m": 126.20843056033081,
   "end_elevation_m": 127.16942569434455,
   "min_gradient_pct": -26.295345479782384
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 44.48912705852687,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 901.0,
   "end_distance_m": 904.0,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 127.16942569434455,
   "min_gradient_pct": -23.781465039836764
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 39.13382335936831,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 901.0,
   "end_distance_m": 906.0,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 127.79144305055716,
   "min_gradient_pct": -18.408169540737163
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.775113190676535,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 899.0,
   "end_distance_m": 909.0,
   "start_elevation_m": 125.46890499826911,
   "end_elevation_m": 128.54641631733676,
   "min_gradient_pct": -9.4333414920861
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.111606872124014,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 900.0,
   "end_distance_m": 920.0,
   "start_elevation_m": 125.66172226210094,
   "end_elevation_m": 130.48404363652574,
   "min_gradient_pct": -8.793550244653758
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.531775225268067,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 901.0,
   "end_distance_m": 926.0,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 131.71769568890576,
   "min_gradient_pct": -8.714824925348182
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.351225155570404,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 898.0,
   "end_distance_m": 948.0,
   "start_elevation_m": 125.27070376207102,
   "end_elevation_m": 135.94631633985622,
   "min_gradient_pct": -8.062275139166218
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.06451634431488,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 888.0,
   "end_distance_m": 988.0,
   "start_elevation_m": 123.6580802762239,
   "end_elevation_m": 141.72259662053878,
   "min_gradient_pct": -6.751609645204866
  }
 ],
 "shape": {
  "ascent_concentration": 0.561,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 360.0,
  "shape_class": "stepped"
 },
 "length_m": 1279.0476751609337,
 "start_elevation_m": 101.41914160339344,
 "end_elevation_m": 178.76523452865743,
 "endpoint_gain_m": 77.34609292526399,
 "overall_gradient_pct": 6.04716262163817,
 "accumulated_ascent_m": 87.24352968776878,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 39.13382335936831,
   "start_distance_m": 901.0,
   "end_distance_m": 906.0,
   "midpoint_distance_m": 903.5,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 127.79144305055716,
   "start_xy": [
    432828.779572815,
    355943.4950691589
   ],
   "end_xy": [
    432825.5572644801,
    355947.31825225614
   ]
  },
  "max_10m": {
   "gradient_pct": 30.775113190676535,
   "start_distance_m": 899.0,
   "end_distance_m": 909.0,
   "midpoint_distance_m": 904.0,
   "start_elevation_m": 125.46890499826911,
   "end_elevation_m": 128.54641631733676,
   "start_xy": [
    432830.0684961489,
    355941.96579592
   ],
   "end_xy": [
    432823.6238794792,
    355949.61216211447
   ]
  },
  "max_20m": {
   "gradient_pct": 24.111606872124014,
   "start_distance_m": 900.0,
   "end_distance_m": 920.0,
   "midpoint_distance_m": 910.0,
   "start_elevation_m": 125.66172226210094,
   "end_elevation_m": 130.48404363652574,
   "start_xy": [
    432829.424034482,
    355942.7304325395
   ],
   "end_xy": [
    432816.5348011425,
    355958.0231649284
   ]
  },
  "max_25m": {
   "gradient_pct": 23.531775225268067,
   "start_distance_m": 901.0,
   "end_distance_m": 926.0,
   "midpoint_distance_m": 913.5,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 131.71769568890576,
   "start_xy": [
    432828.779572815,
    355943.4950691589
   ],
   "end_xy": [
    432812.66803114064,
    355962.61098464514
   ]
  },
  "max_50m": {
   "gradient_pct": 21.351225155570404,
   "start_distance_m": 898.0,
   "end_distance_m": 948.0,
   "midpoint_distance_m": 923.0,
   "start_elevation_m": 125.27070376207102,
   "end_elevation_m": 135.94631633985622,
   "start_xy": [
    432830.7129578159,
    355941.2011593006
   ],
   "end_xy": [
    432798.3813341145,
    355979.33994622773
   ]
  },
  "max_100m": {
   "gradient_pct": 18.06451634431488,
   "start_distance_m": 888.0,
   "end_distance_m": 988.0,
   "midpoint_distance_m": 938.0,
   "start_elevation_m": 123.6580802762239,
   "end_elevation_m": 141.72259662053878,
   "start_xy": [
    432837.15757448564,
    355933.5547931061
   ],
   "end_xy": [
    432761.69395773934,
    355994.32345523284
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.408169540737163,
   "start_distance_m": 770.0,
   "end_distance_m": 775.0,
   "midpoint_distance_m": 772.5,
   "start_elevation_m": 113.71467387348781,
   "end_elevation_m": 112.79426539645095,
   "start_xy": [
    432915.2554716524,
    355845.10899116646
   ],
   "end_xy": [
    432911.9219966497,
    355848.83564441116
   ]
  },
  "min_10m": {
   "gradient_pct": -9.4333414920861,
   "start_distance_m": 770.0,
   "end_distance_m": 780.0,
   "midpoint_distance_m": 775.0,
   "start_elevation_m": 113.71467387348781,
   "end_elevation_m": 112.7713397242792,
   "start_xy": [
    432915.2554716524,
    355845.10899116646
   ],
   "end_xy": [
    432908.58852164703,
    355852.5622976559
   ]
  },
  "min_20m": {
   "gradient_pct": -8.793550244653758,
   "start_distance_m": 69.0,
   "end_distance_m": 89.0,
   "midpoint_distance_m": 79.0,
   "start_elevation_m": 98.27065090968763,
   "end_elevation_m": 96.51194086075688,
   "start_xy": [
    433203.71407881996,
    355209.9747894947
   ],
   "end_xy": [
    433197.25260121864,
    355228.9022643802
   ]
  },
  "min_25m": {
   "gradient_pct": -8.714824925348182,
   "start_distance_m": 69.0,
   "end_distance_m": 94.0,
   "midpoint_distance_m": 81.5,
   "start_elevation_m": 98.27065090968763,
   "end_elevation_m": 96.09194467835059,
   "start_xy": [
    433203.71407881996,
    355209.9747894947
   ],
   "end_xy": [
    433195.6370766969,
    355233.6340801543
   ]
  },
  "min_50m": {
   "gradient_pct": -8.062275139166218,
   "start_distance_m": 53.0,
   "end_distance_m": 103.0,
   "midpoint_distance_m": 78.0,
   "start_elevation_m": 99.464530496128,
   "end_elevation_m": 95.4333929265449,
   "start_xy": [
    433209.0392804885,
    355194.8894598167
   ],
   "end_xy": [
    433192.5940188304,
    355242.1038685444
   ]
  },
  "min_100m": {
   "gradient_pct": -6.751609645204866,
   "start_distance_m": 30.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 80.0,
   "start_elevation_m": 100.72089211640612,
   "end_elevation_m": 93.96928247120125,
   "start_xy": [
    433217.29789461615,
    355173.42331687734
   ],
   "end_xy": [
    433183.41576476605,
    355267.49598646176
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.04975670068714,
   "start_distance_m": 902.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 903.0,
   "start_elevation_m": 126.20843056033081,
   "end_elevation_m": 127.16942569434455,
   "start_xy": [
    432828.135111148,
    355944.2597057783
   ],
   "end_xy": [
    432826.8461878141,
    355945.78897901723
   ]
  },
  "max_3m": {
   "gradient_pct": 44.48912705852687,
   "start_distance_m": 901.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 902.5,
   "start_elevation_m": 125.83475188258875,
   "end_elevation_m": 127.16942569434455,
   "start_xy": [
    432828.779572815,
    355943.4950691589
   ],
   "end_xy": [
    432826.8461878141,
    355945.78897901723
   ]
  }
 },
 "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": 0.111,
   "obstruction_max_height_m": 11.41,
   "flagged_windows_m": []
  },
  "review": [
   "short_window_divergence"
  ],
  "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/SK3055.tif"
  ],
  "calculated_at": "2026-08-15T17:40:40+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": [
   "SK3055.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.2% over 200 m (Terrain 50), gain 31.8 m over 939 m way. EXTENDED by graph walk: +0 segment(s) at base, +6 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): bracken-lane"
 },
 "area": {
  "place": "Holloway",
  "county": "Derbyshire"
 }
}