{
 "ocl_version": "0.1.0",
 "name": "Red Lane",
 "slug": "red-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.8144756406823,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 472.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 97.32063233781945,
   "end_elevation_m": 98.1769218506331,
   "min_gradient_pct": -32.0901857078578
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 38.144108989552684,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 471.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 97.03259858094651,
   "end_elevation_m": 98.1769218506331,
   "min_gradient_pct": -28.99354693318017
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.572500047476126,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 470.0,
   "end_distance_m": 475.0,
   "start_elevation_m": 96.77148028136403,
   "end_elevation_m": 98.45010528373784,
   "min_gradient_pct": -18.60844945496453
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.731322547792132,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 306.0,
   "end_distance_m": 316.0,
   "start_elevation_m": 77.60949163632279,
   "end_elevation_m": 80.382623891102,
   "min_gradient_pct": -8.217371424915711
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.957990061030372,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 304.0,
   "end_distance_m": 324.0,
   "start_elevation_m": 77.22470648339215,
   "end_elevation_m": 81.61630449559823,
   "min_gradient_pct": -1.5587780537939722
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.477090719910336,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 300.0,
   "end_distance_m": 325.0,
   "start_elevation_m": 76.69618281820918,
   "end_elevation_m": 81.81545549818676,
   "min_gradient_pct": -0.986621853337283
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.044999570661503,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 303.0,
   "end_distance_m": 353.0,
   "start_elevation_m": 77.08320742027324,
   "end_elevation_m": 84.60570720560399,
   "min_gradient_pct": -0.47949529144190706
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.765469577728735,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 383.0,
   "end_distance_m": 483.0,
   "start_elevation_m": 86.71301632809725,
   "end_elevation_m": 99.47848590582599,
   "min_gradient_pct": 0.7460118772209796
  }
 ],
 "shape": {
  "ascent_concentration": 0.475,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 40.0,
  "shape_class": "stepped"
 },
 "length_m": 731.12225867554,
 "start_elevation_m": 56.743295224327184,
 "end_elevation_m": 103.42632429344216,
 "endpoint_gain_m": 46.68302906911498,
 "overall_gradient_pct": 6.385119385324601,
 "accumulated_ascent_m": 51.83267301727608,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.572500047476126,
   "start_distance_m": 470.0,
   "end_distance_m": 475.0,
   "midpoint_distance_m": 472.5,
   "start_elevation_m": 96.77148028136403,
   "end_elevation_m": 98.45010528373784,
   "start_xy": [
    431557.71753273957,
    324876.5286515674
   ],
   "end_xy": [
    431561.9617884054,
    324873.8854922657
   ]
  },
  "max_10m": {
   "gradient_pct": 27.731322547792132,
   "start_distance_m": 306.0,
   "end_distance_m": 316.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 77.60949163632279,
   "end_elevation_m": 80.382623891102,
   "start_xy": [
    431486.0310314827,
    325014.25732259057
   ],
   "end_xy": [
    431486.4459276145,
    325004.26593446557
   ]
  },
  "max_20m": {
   "gradient_pct": 21.957990061030372,
   "start_distance_m": 304.0,
   "end_distance_m": 324.0,
   "midpoint_distance_m": 314.0,
   "start_elevation_m": 77.22470648339215,
   "end_elevation_m": 81.61630449559823,
   "start_xy": [
    431485.9480567825,
    325016.25560041727
   ],
   "end_xy": [
    431486.7769337026,
    324996.2727861248
   ]
  },
  "max_25m": {
   "gradient_pct": 20.477090719910336,
   "start_distance_m": 300.0,
   "end_distance_m": 325.0,
   "midpoint_distance_m": 312.5,
   "start_elevation_m": 76.69618281820918,
   "end_elevation_m": 81.81545549818676,
   "start_xy": [
    431485.40327812143,
    325020.14853322256
   ],
   "end_xy": [
    431486.81805545476,
    324995.2736320304
   ]
  },
  "max_50m": {
   "gradient_pct": 15.044999570661503,
   "start_distance_m": 303.0,
   "end_distance_m": 353.0,
   "midpoint_distance_m": 328.0,
   "start_elevation_m": 77.08320742027324,
   "end_elevation_m": 84.60570720560399,
   "start_xy": [
    431485.9069350001,
    325017.2547545104
   ],
   "end_xy": [
    431487.9780536844,
    324967.29767418123
   ]
  },
  "max_100m": {
   "gradient_pct": 12.765469577728735,
   "start_distance_m": 383.0,
   "end_distance_m": 483.0,
   "midpoint_distance_m": 433.0,
   "start_elevation_m": 86.71301632809725,
   "end_elevation_m": 99.47848590582599,
   "start_xy": [
    431500.9671893322,
    324941.6594002634
   ],
   "end_xy": [
    431568.739826546,
    324869.639032348
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.60844945496453,
   "start_distance_m": 66.0,
   "end_distance_m": 71.0,
   "midpoint_distance_m": 68.5,
   "start_elevation_m": 60.663667064560784,
   "end_elevation_m": 59.73324459181256,
   "start_xy": [
    431348.3496272249,
    325208.61507531576
   ],
   "end_xy": [
    431350.5530410553,
    325204.15687055717
   ]
  },
  "min_10m": {
   "gradient_pct": -8.217371424915711,
   "start_distance_m": 483.0,
   "end_distance_m": 493.0,
   "midpoint_distance_m": 488.0,
   "start_elevation_m": 99.47848590582599,
   "end_elevation_m": 98.65674876333442,
   "start_xy": [
    431568.739826546,
    324869.639032348
   ],
   "end_xy": [
    431574.0241149094,
    324861.1980453996
   ]
  },
  "min_20m": {
   "gradient_pct": -1.5587780537939722,
   "start_distance_m": 64.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 74.0,
   "start_elevation_m": 60.60654341984059,
   "end_elevation_m": 60.2947878090818,
   "start_xy": [
    431346.3893941641,
    325209.01192004216
   ],
   "end_xy": [
    431355.7389666749,
    325192.2360415015
   ]
  },
  "min_25m": {
   "gradient_pct": -0.986621853337283,
   "start_distance_m": 685.0,
   "end_distance_m": 710.0,
   "midpoint_distance_m": 697.5,
   "start_elevation_m": 103.73508270888526,
   "end_elevation_m": 103.48842724555094,
   "start_xy": [
    431627.0984906523,
    324680.09362170054
   ],
   "end_xy": [
    431623.20802359504,
    324655.4048581035
   ]
  },
  "min_50m": {
   "gradient_pct": -0.47949529144190706,
   "start_distance_m": 681.0,
   "end_distance_m": 731.0,
   "midpoint_distance_m": 706.0,
   "start_elevation_m": 103.66486666132786,
   "end_elevation_m": 103.42511901560691,
   "start_xy": [
    431627.69747510797,
    324684.048519212
   ],
   "end_xy": [
    431617.4888244635,
    324635.20626045635
   ]
  },
  "min_100m": {
   "gradient_pct": 0.7460118772209796,
   "start_distance_m": 631.0,
   "end_distance_m": 731.0,
   "midpoint_distance_m": 681.0,
   "start_elevation_m": 102.67910713838593,
   "end_elevation_m": 103.42511901560691,
   "start_xy": [
    431623.6296556464,
    324732.7955681868
   ],
   "end_xy": [
    431617.4888244635,
    324635.20626045635
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.8144756406823,
   "start_distance_m": 472.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 473.0,
   "start_elevation_m": 97.32063233781945,
   "end_elevation_m": 98.1769218506331,
   "start_xy": [
    431559.41515707184,
    324875.4712625548
   ],
   "end_xy": [
    431561.1130608032,
    324874.41432253836
   ]
  },
  "max_3m": {
   "gradient_pct": 38.144108989552684,
   "start_distance_m": 471.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 472.5,
   "start_elevation_m": 97.03259858094651,
   "end_elevation_m": 98.1769218506331,
   "start_xy": [
    431558.5662847306,
    324875.99986045074
   ],
   "end_xy": [
    431561.1130608032,
    324874.41432253836
   ]
  }
 },
 "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": 0.1,
   "obstruction_max_height_m": 9.55,
   "flagged_windows_m": [
    2,
    5,
    50,
    100
   ]
  },
  "review": [],
  "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/SK3020.tif",
   "data/cache/england/bulk_dtm_1m/SK3025.tif"
  ],
  "calculated_at": "2026-08-19T18:44:36+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": [
   "SK3020.tif",
   "SK3025.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.4% over 200 m (Terrain 50), gain 42.8 m over 665 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": "Milton",
  "county": "Derbyshire"
 }
}