{
 "ocl_version": "0.1.0",
 "name": "Longley Lane",
 "slug": "longley-lane-3",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.04981413034608,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 483.0,
   "end_distance_m": 485.0,
   "start_elevation_m": 217.37328248116958,
   "end_elevation_m": 218.2942787637765,
   "min_gradient_pct": -12.978107991817467,
   "suppressed_max_gradient_pct": 55.37501204021993,
   "suppressed_location_m": [
    385.0,
    387.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.84129774521913,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 483.0,
   "end_distance_m": 486.0,
   "start_elevation_m": 217.37328248116958,
   "end_elevation_m": 218.56852141352616,
   "min_gradient_pct": -6.9132177982481835,
   "suppressed_max_gradient_pct": 48.25517463037651,
   "suppressed_location_m": [
    385.0,
    388.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.79672256952085,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 482.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 217.22719885724044,
   "end_elevation_m": 218.96703498571648,
   "min_gradient_pct": -5.359098240762705,
   "suppressed_max_gradient_pct": 35.09921163718843,
   "suppressed_location_m": [
    385.0,
    390.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.629908079680888,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 477.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 216.1040441777484,
   "end_elevation_m": 218.96703498571648,
   "min_gradient_pct": -4.093755550596825
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.55152900994426,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 467.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 214.25672918372763,
   "end_elevation_m": 218.96703498571648,
   "min_gradient_pct": -2.968405795752176
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.913753609178116,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 462.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 213.23859658342195,
   "end_elevation_m": 218.96703498571648,
   "min_gradient_pct": -2.703178617799722
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.82388394135569,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 437.0,
   "end_distance_m": 487.0,
   "start_elevation_m": 209.05509301503864,
   "end_elevation_m": 218.96703498571648,
   "min_gradient_pct": -1.924663126660846
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.529217423108863,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 428.0,
   "end_distance_m": 528.0,
   "start_elevation_m": 208.17491966506432,
   "end_elevation_m": 223.70413708817318,
   "min_gradient_pct": -0.4636734247635559,
   "suppressed_max_gradient_pct": 15.918412178895464,
   "suppressed_location_m": [
    385.0,
    485.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.412,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 84.0,
  "shape_class": "sustained"
 },
 "length_m": 1542.1175312420792,
 "start_elevation_m": 159.5483347106973,
 "end_elevation_m": 271.3908714892581,
 "endpoint_gain_m": 111.84253677856077,
 "overall_gradient_pct": 7.252530012318751,
 "accumulated_ascent_m": 114.49332332751518,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.79672256952085,
   "start_distance_m": 482.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 484.5,
   "start_elevation_m": 217.22719885724044,
   "end_elevation_m": 218.96703498571648,
   "start_xy": [
    405019.4783008425,
    421933.68788762175
   ],
   "end_xy": [
    405024.30123288743,
    421932.416657589
   ]
  },
  "max_10m": {
   "gradient_pct": 28.629908079680888,
   "start_distance_m": 477.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 482.0,
   "start_elevation_m": 216.1040441777484,
   "end_elevation_m": 218.96703498571648,
   "start_xy": [
    405014.5954442276,
    421934.7638560359
   ],
   "end_xy": [
    405024.30123288743,
    421932.416657589
   ]
  },
  "max_20m": {
   "gradient_pct": 23.55152900994426,
   "start_distance_m": 467.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 477.0,
   "start_elevation_m": 214.25672918372763,
   "end_elevation_m": 218.96703498571648,
   "start_xy": [
    405004.69875082123,
    421935.91276573617
   ],
   "end_xy": [
    405024.30123288743,
    421932.416657589
   ]
  },
  "max_25m": {
   "gradient_pct": 22.913753609178116,
   "start_distance_m": 462.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 474.5,
   "start_elevation_m": 213.23859658342195,
   "end_elevation_m": 218.96703498571648,
   "start_xy": [
    404999.70199155994,
    421936.09275706095
   ],
   "end_xy": [
    405024.30123288743,
    421932.416657589
   ]
  },
  "max_50m": {
   "gradient_pct": 19.82388394135569,
   "start_distance_m": 437.0,
   "end_distance_m": 487.0,
   "midpoint_distance_m": 462.0,
   "start_elevation_m": 209.05509301503864,
   "end_elevation_m": 218.96703498571648,
   "start_xy": [
    404974.7184884292,
    421937.00074241654
   ],
   "end_xy": [
    405024.30123288743,
    421932.416657589
   ]
  },
  "max_100m": {
   "gradient_pct": 15.529217423108863,
   "start_distance_m": 428.0,
   "end_distance_m": 528.0,
   "midpoint_distance_m": 478.0,
   "start_elevation_m": 208.17491966506432,
   "end_elevation_m": 223.70413708817318,
   "start_xy": [
    404965.902516803,
    421938.705707104
   ],
   "end_xy": [
    405060.8170263177,
    421914.01795629255
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.359098240762705,
   "start_distance_m": 573.0,
   "end_distance_m": 578.0,
   "midpoint_distance_m": 575.5,
   "start_elevation_m": 224.14888926028473,
   "end_elevation_m": 223.8809343482466,
   "start_xy": [
    405099.4564073176,
    421890.9528817851
   ],
   "end_xy": [
    405103.75021115347,
    421888.39099870715
   ]
  },
  "min_10m": {
   "gradient_pct": -4.093755550596825,
   "start_distance_m": 568.0,
   "end_distance_m": 578.0,
   "midpoint_distance_m": 573.0,
   "start_elevation_m": 224.29030990330628,
   "end_elevation_m": 223.8809343482466,
   "start_xy": [
    405095.16326407524,
    421893.5158713963
   ],
   "end_xy": [
    405103.75021115347,
    421888.39099870715
   ]
  },
  "min_20m": {
   "gradient_pct": -2.968405795752176,
   "start_distance_m": 563.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 573.0,
   "start_elevation_m": 224.39195933780258,
   "end_elevation_m": 223.79827817865214,
   "start_xy": [
    405090.8694605168,
    421896.0777540802
   ],
   "end_xy": [
    405108.0439895509,
    421885.82907383447
   ]
  },
  "min_25m": {
   "gradient_pct": -2.703178617799722,
   "start_distance_m": 566.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 578.5,
   "start_elevation_m": 224.3411349654192,
   "end_elevation_m": 223.66534031096927,
   "start_xy": [
    405093.4453276983,
    421894.5399292415
   ],
   "end_xy": [
    405115.0774439739,
    421882.0241259595
   ]
  },
  "min_50m": {
   "gradient_pct": -1.924663126660846,
   "start_distance_m": 548.0,
   "end_distance_m": 598.0,
   "midpoint_distance_m": 573.0,
   "start_elevation_m": 224.54342962652072,
   "end_elevation_m": 223.5810980631903,
   "start_xy": [
    405077.9890573848,
    421903.7650903597
   ],
   "end_xy": [
    405121.30467641744,
    421878.8270066036
   ]
  },
  "min_100m": {
   "gradient_pct": -0.4636734247635559,
   "start_distance_m": 541.0,
   "end_distance_m": 641.0,
   "midpoint_distance_m": 591.0,
   "start_elevation_m": 224.53844601268142,
   "end_elevation_m": 224.07477258791786,
   "start_xy": [
    405071.97905341565,
    421907.35394009063
   ],
   "end_xy": [
    405159.55581238476,
    421859.18393678666
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.04981413034608,
   "start_distance_m": 483.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 484.0,
   "start_elevation_m": 217.37328248116958,
   "end_elevation_m": 218.2942787637765,
   "start_xy": [
    405020.4548710508,
    421933.472688693
   ],
   "end_xy": [
    405022.4075942863,
    421933.0404428658
   ]
  },
  "max_3m": {
   "gradient_pct": 39.84129774521913,
   "start_distance_m": 483.0,
   "end_distance_m": 486.0,
   "midpoint_distance_m": 484.5,
   "start_elevation_m": 217.37328248116958,
   "end_elevation_m": 218.56852141352616,
   "start_xy": [
    405020.4548710508,
    421933.472688693
   ],
   "end_xy": [
    405023.37640881236,
    421932.7970526529
   ]
  }
 },
 "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": 0.027,
   "obstruction_max_height_m": 7.47,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    384.0,
    389.0
   ]
  ],
  "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/SE0020.tif",
   "data/cache/england/bulk_dtm_1m/SE0520.tif"
  ],
  "calculated_at": "2026-08-19T18:40:00+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": [
   "SE0020.tif",
   "SE0520.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.0% over 200 m (Terrain 50), gain 81.8 m over 904 m way. EXTENDED by graph walk: +0 segment(s) at base, +5 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": "Sowerby Bridge",
  "county": ""
 }
}