{
 "ocl_version": "0.1.0",
 "name": "Stockbird Head to Colton",
 "slug": "discovered-lane-54-2587-3-0486",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.42918793745589,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 852.0,
   "end_distance_m": 854.0,
   "start_elevation_m": 49.20775845640965,
   "end_elevation_m": 50.07634221515877,
   "min_gradient_pct": -29.81161988907637,
   "suppressed_max_gradient_pct": 48.83304373421042,
   "suppressed_location_m": [
    1.0,
    3.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.87020766982764,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 851.0,
   "end_distance_m": 854.0,
   "start_elevation_m": 48.82023598506394,
   "end_elevation_m": 50.07634221515877,
   "min_gradient_pct": -28.042015023379225
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.309088637079384,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 850.0,
   "end_distance_m": 855.0,
   "start_elevation_m": 48.54760264881808,
   "end_elevation_m": 50.41305708067205,
   "min_gradient_pct": -28.275196732906238
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.7162526459783,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 653.0,
   "end_distance_m": 663.0,
   "start_elevation_m": 43.22650212050997,
   "end_elevation_m": 45.9981273851078,
   "min_gradient_pct": -21.982961698345918
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.90229218483306,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 641.0,
   "end_distance_m": 661.0,
   "start_elevation_m": 40.92978132855454,
   "end_elevation_m": 45.71023976552115,
   "min_gradient_pct": -17.19261239730823
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.469514441120683,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 639.0,
   "end_distance_m": 664.0,
   "start_elevation_m": 40.72232867610346,
   "end_elevation_m": 46.08970728638363,
   "min_gradient_pct": -15.07769338201817
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.185349082567114,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 614.0,
   "end_distance_m": 664.0,
   "start_elevation_m": 37.99703274510007,
   "end_elevation_m": 46.08970728638363,
   "min_gradient_pct": -12.045622876269222
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.480122763144738,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 221.0,
   "end_distance_m": 321.0,
   "start_elevation_m": 15.129551455441248,
   "end_elevation_m": 28.609674218585987,
   "min_gradient_pct": -7.743460301093954
  }
 ],
 "shape": {
  "ascent_concentration": 0.365,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 92.0,
  "shape_class": "sustained"
 },
 "length_m": 2369.9999999999873,
 "start_elevation_m": 9.695125380178457,
 "end_elevation_m": 82.99520480665339,
 "endpoint_gain_m": 73.30007942647494,
 "overall_gradient_pct": 3.0928303555474823,
 "accumulated_ascent_m": 121.57553613881686,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.309088637079384,
   "start_distance_m": 850.0,
   "end_distance_m": 855.0,
   "midpoint_distance_m": 852.5,
   "start_elevation_m": 48.54760264881808,
   "end_elevation_m": 50.41305708067205,
   "start_xy": [
    332168.9058645472,
    484822.85622362007
   ],
   "end_xy": [
    332163.921715185,
    484822.765
   ]
  },
  "max_10m": {
   "gradient_pct": 27.7162526459783,
   "start_distance_m": 653.0,
   "end_distance_m": 663.0,
   "midpoint_distance_m": 658.0,
   "start_elevation_m": 43.22650212050997,
   "end_elevation_m": 45.9981273851078,
   "start_xy": [
    332341.13066078833,
    484910.09021779493
   ],
   "end_xy": [
    332335.2056402304,
    484902.0345304488
   ]
  },
  "max_20m": {
   "gradient_pct": 23.90229218483306,
   "start_distance_m": 641.0,
   "end_distance_m": 661.0,
   "midpoint_distance_m": 651.0,
   "start_elevation_m": 40.92978132855454,
   "end_elevation_m": 45.71023976552115,
   "start_xy": [
    332348.24058598286,
    484919.7571160746
   ],
   "end_xy": [
    332336.39070713165,
    484903.645621534
   ]
  },
  "max_25m": {
   "gradient_pct": 21.469514441120683,
   "start_distance_m": 639.0,
   "end_distance_m": 664.0,
   "midpoint_distance_m": 651.5,
   "start_elevation_m": 40.72232867610346,
   "end_elevation_m": 46.08970728638363,
   "start_xy": [
    332349.42565322085,
    484921.3682075047
   ],
   "end_xy": [
    332334.61292718764,
    484901.22911700845
   ]
  },
  "max_50m": {
   "gradient_pct": 16.185349082567114,
   "start_distance_m": 614.0,
   "end_distance_m": 664.0,
   "midpoint_distance_m": 639.0,
   "start_elevation_m": 37.99703274510007,
   "end_elevation_m": 46.08970728638363,
   "start_xy": [
    332365.5116077273,
    484940.4301120987
   ],
   "end_xy": [
    332334.61292718764,
    484901.22911700845
   ]
  },
  "max_100m": {
   "gradient_pct": 13.480122763144738,
   "start_distance_m": 221.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 271.0,
   "start_elevation_m": 15.129551455441248,
   "end_elevation_m": 28.609674218585987,
   "start_xy": [
    332154.6984645089,
    484676.7671776966
   ],
   "end_xy": [
    332221.34344284615,
    484751.32215346803
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -28.275196732906238,
   "start_distance_m": 981.0,
   "end_distance_m": 986.0,
   "midpoint_distance_m": 983.5,
   "start_elevation_m": 54.62606030284486,
   "end_elevation_m": 53.21230046619955,
   "start_xy": [
    332043.39187690924,
    484829.5285801889
   ],
   "end_xy": [
    332039.3875607386,
    484832.5228166262
   ]
  },
  "min_10m": {
   "gradient_pct": -21.982961698345918,
   "start_distance_m": 981.0,
   "end_distance_m": 991.0,
   "midpoint_distance_m": 986.0,
   "start_elevation_m": 54.62606030284486,
   "end_elevation_m": 52.42776413301027,
   "start_xy": [
    332043.39187690924,
    484829.5285801889
   ],
   "end_xy": [
    332035.3837243015,
    484835.5176943114
   ]
  },
  "min_20m": {
   "gradient_pct": -17.19261239730823,
   "start_distance_m": 981.0,
   "end_distance_m": 1001.0,
   "midpoint_distance_m": 991.0,
   "start_elevation_m": 54.62606030284486,
   "end_elevation_m": 51.18753782338322,
   "start_xy": [
    332043.39187690924,
    484829.5285801889
   ],
   "end_xy": [
    332026.65094179433,
    484840.0353452543
   ]
  },
  "min_25m": {
   "gradient_pct": -15.07769338201817,
   "start_distance_m": 1147.0,
   "end_distance_m": 1172.0,
   "midpoint_distance_m": 1159.5,
   "start_elevation_m": 45.883276987469124,
   "end_elevation_m": 42.11385364196458,
   "start_xy": [
    331883.55038678326,
    484844.0473747172
   ],
   "end_xy": [
    331859.79069248436,
    484850.6380985095
   ]
  },
  "min_50m": {
   "gradient_pct": -12.045622876269222,
   "start_distance_m": 1141.0,
   "end_distance_m": 1191.0,
   "midpoint_distance_m": 1166.0,
   "start_elevation_m": 46.353831553158194,
   "end_elevation_m": 40.331020115023584,
   "start_xy": [
    331889.5486583775,
    484843.90336819895
   ],
   "end_xy": [
    331843.4246942796,
    484860.17009322846
   ]
  },
  "min_100m": {
   "gradient_pct": -7.743460301093954,
   "start_distance_m": 950.0,
   "end_distance_m": 1050.0,
   "midpoint_distance_m": 1000.0,
   "start_elevation_m": 56.49122086418722,
   "end_elevation_m": 48.747760563093266,
   "start_xy": [
    332072.11051517737,
    484824.73725278163
   ],
   "end_xy": [
    331979.05040229723,
    484851.54148413305
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.42918793745589,
   "start_distance_m": 852.0,
   "end_distance_m": 854.0,
   "midpoint_distance_m": 853.0,
   "start_elevation_m": 49.20775845640965,
   "end_elevation_m": 50.07634221515877,
   "start_xy": [
    332166.921714685,
    484822.766
   ],
   "end_xy": [
    332164.9217150526,
    484822.76526471507
   ]
  },
  "max_3m": {
   "gradient_pct": 41.87020766982764,
   "start_distance_m": 851.0,
   "end_distance_m": 854.0,
   "midpoint_distance_m": 852.5,
   "start_elevation_m": 48.82023598506394,
   "end_elevation_m": 50.07634221515877,
   "start_xy": [
    332167.921714685,
    484822.766
   ],
   "end_xy": [
    332164.9217150526,
    484822.76526471507
   ]
  }
 },
 "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": 0.04,
   "obstruction_max_height_m": 15.94,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    4.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/SD3080.tif",
   "data/cache/england/bulk_dtm_1m/SD3085.tif"
  ],
  "calculated_at": "2026-08-19T18:29:40+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SD3080.tif",
   "SD3085.tif"
  ],
  "route_summit_trim_m": 146.2,
  "route_summit_trim_loss_m": 13.2,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.6% over 200 m (Terrain 50), gain 30.6 m over 1927 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. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (54.2587, -3.0486)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (54.2587, -3.0486)'"
 },
 "area": {
  "place": "Stockbird Head",
  "county": "Westmorland and Furness"
 }
}