{
 "ocl_version": "0.1.0",
 "name": "Ankers Knowl Lane",
 "slug": "ankers-knowl-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.792972376151283,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 474.0,
   "end_distance_m": 476.0,
   "start_elevation_m": 391.3438180651218,
   "end_elevation_m": 391.93967751264483,
   "min_gradient_pct": -7.395518025430192
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.753998252962674,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 473.0,
   "end_distance_m": 476.0,
   "start_elevation_m": 391.13705756505595,
   "end_elevation_m": 391.93967751264483,
   "min_gradient_pct": -5.457881471539849
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.874127103424144,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 127.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 353.4534075067926,
   "end_elevation_m": 354.5471138619638,
   "min_gradient_pct": -4.237246604462825
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.44015592436233,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 31.0,
   "end_distance_m": 41.0,
   "start_elevation_m": 337.30682612465995,
   "end_elevation_m": 339.4508417170962,
   "min_gradient_pct": -2.8649592866878493
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.141025671265652,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 30.0,
   "end_distance_m": 50.0,
   "start_elevation_m": 337.0974341361047,
   "end_elevation_m": 341.32563927035784,
   "min_gradient_pct": -2.210110457855876
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.96591660043191,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 25.0,
   "end_distance_m": 50.0,
   "start_elevation_m": 336.08416012024986,
   "end_elevation_m": 341.32563927035784,
   "min_gradient_pct": -2.0535910803271236
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.042630103915485,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 15.0,
   "end_distance_m": 65.0,
   "start_elevation_m": 334.21021225542495,
   "end_elevation_m": 344.2315273073827,
   "min_gradient_pct": -0.9780677923346275
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.174794936472324,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "start_elevation_m": 331.72515505371206,
   "end_elevation_m": 349.8999499901844,
   "min_gradient_pct": 0.9975499831703587
  }
 ],
 "shape": {
  "ascent_concentration": 0.433,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 233.0,
  "shape_class": "sustained"
 },
 "length_m": 982.9597320431435,
 "start_elevation_m": 331.72515505371206,
 "end_elevation_m": 417.2291115142213,
 "endpoint_gain_m": 85.50395646050924,
 "overall_gradient_pct": 8.698622504381122,
 "accumulated_ascent_m": 88.15054093964017,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.874127103424144,
   "start_distance_m": 127.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 129.5,
   "start_elevation_m": 353.4534075067926,
   "end_elevation_m": 354.5471138619638,
   "start_xy": [
    397496.61156456184,
    374120.7601571231
   ],
   "end_xy": [
    397497.2485968591,
    374115.8009048483
   ]
  },
  "max_10m": {
   "gradient_pct": 21.44015592436233,
   "start_distance_m": 31.0,
   "end_distance_m": 41.0,
   "midpoint_distance_m": 36.0,
   "start_elevation_m": 337.30682612465995,
   "end_elevation_m": 339.4508417170962,
   "start_xy": [
    397529.6802103019,
    374210.20194546506
   ],
   "end_xy": [
    397526.08539401536,
    374200.8704251151
   ]
  },
  "max_20m": {
   "gradient_pct": 21.141025671265652,
   "start_distance_m": 30.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 40.0,
   "start_elevation_m": 337.0974341361047,
   "end_elevation_m": 341.32563927035784,
   "start_xy": [
    397530.0401916289,
    374211.13490497146
   ],
   "end_xy": [
    397522.9032368322,
    374192.45193702774
   ]
  },
  "max_25m": {
   "gradient_pct": 20.96591660043191,
   "start_distance_m": 25.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 37.5,
   "start_elevation_m": 336.08416012024986,
   "end_elevation_m": 341.32563927035784,
   "start_xy": [
    397531.8375010394,
    374215.8007032584
   ],
   "end_xy": [
    397522.9032368322,
    374192.45193702774
   ]
  },
  "max_50m": {
   "gradient_pct": 20.042630103915485,
   "start_distance_m": 15.0,
   "end_distance_m": 65.0,
   "midpoint_distance_m": 40.0,
   "start_elevation_m": 334.21021225542495,
   "end_elevation_m": 344.2315273073827,
   "start_xy": [
    397535.49333043816,
    374225.10654554504
   ],
   "end_xy": [
    397517.7283315644,
    374178.37360705034
   ]
  },
  "max_100m": {
   "gradient_pct": 18.174794936472324,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 331.72515505371206,
   "end_elevation_m": 349.8999499901844,
   "start_xy": [
    397542.235,
    374238.483
   ],
   "end_xy": [
    397505.6355401672,
    374145.66356722923
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.237246604462825,
   "start_distance_m": 861.0,
   "end_distance_m": 866.0,
   "midpoint_distance_m": 863.5,
   "start_elevation_m": 416.08013727651195,
   "end_elevation_m": 415.8682749462888,
   "start_xy": [
    397651.1705213483,
    373408.0469975676
   ],
   "end_xy": [
    397653.59262006235,
    373403.6728194752
   ]
  },
  "min_10m": {
   "gradient_pct": -2.8649592866878493,
   "start_distance_m": 862.0,
   "end_distance_m": 872.0,
   "midpoint_distance_m": 867.0,
   "start_elevation_m": 416.0494720277338,
   "end_elevation_m": 415.76297609906504,
   "start_xy": [
    397651.6552911806,
    373407.1723558202
   ],
   "end_xy": [
    397656.49948829715,
    373398.4239994628
   ]
  },
  "min_20m": {
   "gradient_pct": -2.210110457855876,
   "start_distance_m": 956.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 966.0,
   "start_elevation_m": 417.5334682924975,
   "end_elevation_m": 417.0914462009263,
   "start_xy": [
    397696.46696355334,
    373324.54364294495
   ],
   "end_xy": [
    397705.0702455943,
    373306.49681479216
   ]
  },
  "min_25m": {
   "gradient_pct": -2.0535910803271236,
   "start_distance_m": 951.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 963.5,
   "start_elevation_m": 417.6048439710081,
   "end_elevation_m": 417.0914462009263,
   "start_xy": [
    397694.13066376577,
    373328.9642424648
   ],
   "end_xy": [
    397705.0702455943,
    373306.49681479216
   ]
  },
  "min_50m": {
   "gradient_pct": -0.9780677923346275,
   "start_distance_m": 930.0,
   "end_distance_m": 980.0,
   "midpoint_distance_m": 955.0,
   "start_elevation_m": 417.6168044851573,
   "end_elevation_m": 417.12777058898996,
   "start_xy": [
    397684.24920619914,
    373347.4938876991
   ],
   "end_xy": [
    397706.72341017827,
    373302.85441967944
   ]
  },
  "min_100m": {
   "gradient_pct": 0.9975499831703587,
   "start_distance_m": 879.0,
   "end_distance_m": 979.0,
   "midpoint_distance_m": 929.0,
   "start_elevation_m": 416.0992170590387,
   "end_elevation_m": 417.0967670422091,
   "start_xy": [
    397659.8904097822,
    373392.30014140613
   ],
   "end_xy": [
    397706.30934496364,
    373303.76466686727
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.792972376151283,
   "start_distance_m": 474.0,
   "end_distance_m": 476.0,
   "midpoint_distance_m": 475.0,
   "start_elevation_m": 391.3438180651218,
   "end_elevation_m": 391.93967751264483,
   "start_xy": [
    397573.8957968947,
    373782.6487434472
   ],
   "end_xy": [
    397574.28604521084,
    373780.687443966
   ]
  },
  "max_3m": {
   "gradient_pct": 26.753998252962674,
   "start_distance_m": 473.0,
   "end_distance_m": 476.0,
   "midpoint_distance_m": 474.5,
   "start_elevation_m": 391.13705756505595,
   "end_elevation_m": 391.93967751264483,
   "start_xy": [
    397573.68889796705,
    373783.6271057501
   ],
   "end_xy": [
    397574.28604521084,
    373780.687443966
   ]
  }
 },
 "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": 0.0,
   "obstruction_max_height_m": 1.24,
   "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/SJ9570.tif"
  ],
  "calculated_at": "2026-08-19T18:03:41+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": [
   "SJ9570.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.9% over 200 m (Terrain 50), gain 44.9 m over 708 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."
 },
 "area": {
  "place": "King's Clough",
  "county": "Cheshire East"
 }
}