{
 "ocl_version": "0.1.0",
 "name": "Stubbing Lane",
 "slug": "stubbing-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.14828566131308,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 521.0,
   "end_distance_m": 523.0,
   "start_elevation_m": 168.5207863539774,
   "end_elevation_m": 169.44375206720366,
   "min_gradient_pct": -13.390056198952038
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.256121782619026,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 520.0,
   "end_distance_m": 523.0,
   "start_elevation_m": 168.1760684137251,
   "end_elevation_m": 169.44375206720366,
   "min_gradient_pct": -7.569742740812065
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.45030660197722,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 520.0,
   "end_distance_m": 525.0,
   "start_elevation_m": 168.1760684137251,
   "end_elevation_m": 169.84858374382395,
   "min_gradient_pct": -0.6501185565707601
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.889665005530503,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 593.0,
   "end_distance_m": 603.0,
   "start_elevation_m": 174.2795116414729,
   "end_elevation_m": 176.96847814202596,
   "min_gradient_pct": 0.6085931660894062
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.232156419319665,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 493.0,
   "end_distance_m": 513.0,
   "start_elevation_m": 163.205945968476,
   "end_elevation_m": 167.85237725233992,
   "min_gradient_pct": 1.6872165207446699
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.101667293194282,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 489.0,
   "end_distance_m": 514.0,
   "start_elevation_m": 162.52239431432415,
   "end_elevation_m": 168.04781113762272,
   "min_gradient_pct": 1.906400782053197
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.008666697954084,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 475.0,
   "end_distance_m": 525.0,
   "start_elevation_m": 160.3442503948469,
   "end_elevation_m": 169.84858374382395,
   "min_gradient_pct": 4.800011018233249
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.616363729563375,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 425.0,
   "end_distance_m": 525.0,
   "start_elevation_m": 152.23222001426058,
   "end_elevation_m": 169.84858374382395,
   "min_gradient_pct": 8.00343859818085
  }
 ],
 "shape": {
  "ascent_concentration": 0.322,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 147.0,
  "shape_class": "sustained"
 },
 "length_m": 645.028093671349,
 "start_elevation_m": 106.16516129745477,
 "end_elevation_m": 179.37153866259638,
 "endpoint_gain_m": 73.2063773651416,
 "overall_gradient_pct": 11.349331615692588,
 "accumulated_ascent_m": 74.38413479624994,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.45030660197722,
   "start_distance_m": 520.0,
   "end_distance_m": 525.0,
   "midpoint_distance_m": 522.5,
   "start_elevation_m": 168.1760684137251,
   "end_elevation_m": 169.84858374382395,
   "start_xy": [
    404036.6497038559,
    421637.7241094855
   ],
   "end_xy": [
    404032.8050232497,
    421640.91978565644
   ]
  },
  "max_10m": {
   "gradient_pct": 26.889665005530503,
   "start_distance_m": 593.0,
   "end_distance_m": 603.0,
   "midpoint_distance_m": 598.0,
   "start_elevation_m": 174.2795116414729,
   "end_elevation_m": 176.96847814202596,
   "start_xy": [
    403966.4677352214,
    421645.0339168604
   ],
   "end_xy": [
    403961.0560580397,
    421648.6498277479
   ]
  },
  "max_20m": {
   "gradient_pct": 23.232156419319665,
   "start_distance_m": 493.0,
   "end_distance_m": 513.0,
   "midpoint_distance_m": 503.0,
   "start_elevation_m": 163.205945968476,
   "end_elevation_m": 167.85237725233992,
   "start_xy": [
    404062.2807130167,
    421629.70710229344
   ],
   "end_xy": [
    404043.2374437944,
    421635.3828654807
   ]
  },
  "max_25m": {
   "gradient_pct": 22.101667293194282,
   "start_distance_m": 489.0,
   "end_distance_m": 514.0,
   "midpoint_distance_m": 501.5,
   "start_elevation_m": 162.52239431432415,
   "end_elevation_m": 168.04781113762272,
   "start_xy": [
    404066.27077127714,
    421629.4252680434
   ],
   "end_xy": [
    404042.2924920319,
    421635.7100748025
   ]
  },
  "max_50m": {
   "gradient_pct": 19.008666697954084,
   "start_distance_m": 475.0,
   "end_distance_m": 525.0,
   "midpoint_distance_m": 500.0,
   "start_elevation_m": 160.3442503948469,
   "end_elevation_m": 169.84858374382395,
   "start_xy": [
    404080.25658520276,
    421628.9182178072
   ],
   "end_xy": [
    404032.8050232497,
    421640.91978565644
   ]
  },
  "max_100m": {
   "gradient_pct": 17.616363729563375,
   "start_distance_m": 425.0,
   "end_distance_m": 525.0,
   "midpoint_distance_m": 475.0,
   "start_elevation_m": 152.23222001426058,
   "end_elevation_m": 169.84858374382395,
   "start_xy": [
    404118.9663084054,
    421602.8468740611
   ],
   "end_xy": [
    404032.8050232497,
    421640.91978565644
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.6501185565707601,
   "start_distance_m": 292.0,
   "end_distance_m": 297.0,
   "midpoint_distance_m": 294.5,
   "start_elevation_m": 140.3857633595354,
   "end_elevation_m": 140.35325743170685,
   "start_xy": [
    404240.35837361845,
    421587.3717743019
   ],
   "end_xy": [
    404235.3602292137,
    421587.35444561415
   ]
  },
  "min_10m": {
   "gradient_pct": 0.6085931660894062,
   "start_distance_m": 528.0,
   "end_distance_m": 538.0,
   "midpoint_distance_m": 533.0,
   "start_elevation_m": 169.94699099930915,
   "end_elevation_m": 170.0078503159181,
   "start_xy": [
    404030.50666747236,
    421642.8476903672
   ],
   "end_xy": [
    404020.7486990026,
    421644.48182882444
   ]
  },
  "min_20m": {
   "gradient_pct": 1.6872165207446699,
   "start_distance_m": 526.0,
   "end_distance_m": 546.0,
   "midpoint_distance_m": 536.0,
   "start_elevation_m": 169.89378816754106,
   "end_elevation_m": 170.23123147169,
   "start_xy": [
    404032.0400946094,
    421641.56390062347
   ],
   "end_xy": [
    404012.80981717637,
    421645.46881418664
   ]
  },
  "min_25m": {
   "gradient_pct": 1.906400782053197,
   "start_distance_m": 526.0,
   "end_distance_m": 551.0,
   "midpoint_distance_m": 538.5,
   "start_elevation_m": 169.89378816754106,
   "end_elevation_m": 170.37038836305436,
   "start_xy": [
    404032.0400946094,
    421641.56390062347
   ],
   "end_xy": [
    404007.8477853141,
    421646.0838181333
   ]
  },
  "min_50m": {
   "gradient_pct": 4.800011018233249,
   "start_distance_m": 524.0,
   "end_distance_m": 574.0,
   "midpoint_distance_m": 549.0,
   "start_elevation_m": 169.6755072390441,
   "end_elevation_m": 172.07551274816072,
   "start_xy": [
    404033.56969565124,
    421640.2753664929
   ],
   "end_xy": [
    403984.973409173,
    421648.430626555
   ]
  },
  "min_100m": {
   "gradient_pct": 8.00343859818085,
   "start_distance_m": 292.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 342.0,
   "start_elevation_m": 140.3857633595354,
   "end_elevation_m": 148.38920195771624,
   "start_xy": [
    404240.35837361845,
    421587.3717743019
   ],
   "end_xy": [
    404141.88280013076,
    421580.1149322433
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.14828566131308,
   "start_distance_m": 521.0,
   "end_distance_m": 523.0,
   "midpoint_distance_m": 522.0,
   "start_elevation_m": 168.5207863539774,
   "end_elevation_m": 169.44375206720366,
   "start_xy": [
    404035.86342570063,
    421638.3417688784
   ],
   "end_xy": [
    404034.3342314611,
    421639.63078523864
   ]
  },
  "max_3m": {
   "gradient_pct": 42.256121782619026,
   "start_distance_m": 520.0,
   "end_distance_m": 523.0,
   "midpoint_distance_m": 521.5,
   "start_elevation_m": 168.1760684137251,
   "end_elevation_m": 169.44375206720366,
   "start_xy": [
    404036.6497038559,
    421637.7241094855
   ],
   "end_xy": [
    404034.3342314611,
    421639.63078523864
   ]
  }
 },
 "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": 0.17,
   "obstruction_max_height_m": 21.38,
   "flagged_windows_m": [
    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/SE0020.tif"
  ],
  "calculated_at": "2026-08-19T18:49:10+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"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.7% over 200 m (Terrain 50), gain 20.3 m over 139 m way. EXTENDED by graph walk: +2 segment(s) at base, +9 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): dean-lane-2 ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Triangle",
  "county": ""
 }
}