{
 "ocl_version": "0.1.0",
 "name": "Bughole Lane",
 "slug": "bughole-lane",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.40194333673264,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 779.0,
   "end_distance_m": 781.0,
   "start_elevation_m": 96.73190516137126,
   "end_elevation_m": 97.65994402810591,
   "min_gradient_pct": -34.02957616432687
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.94089846199912,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 779.0,
   "end_distance_m": 782.0,
   "start_elevation_m": 96.73190516137126,
   "end_elevation_m": 97.96013211523123,
   "min_gradient_pct": -33.25992948875106
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 36.570999841180196,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 777.0,
   "end_distance_m": 782.0,
   "start_elevation_m": 96.13158212317222,
   "end_elevation_m": 97.96013211523123,
   "min_gradient_pct": -32.28782445663711
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.29206505075635,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 60.33744738981136,
   "end_elevation_m": 62.866653894886994,
   "min_gradient_pct": -22.138245154644665
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.67421788018428,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 125.0,
   "end_distance_m": 145.0,
   "start_elevation_m": 59.79289529542876,
   "end_elevation_m": 64.32773887146561,
   "min_gradient_pct": -20.25580724593098
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.323278097938413,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 124.0,
   "end_distance_m": 149.0,
   "start_elevation_m": 59.680320598340664,
   "end_elevation_m": 65.01114012282527,
   "min_gradient_pct": -17.47464738308983
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.16331417391092,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 707.0,
   "end_distance_m": 757.0,
   "start_elevation_m": 85.38790120013539,
   "end_elevation_m": 94.46955828709085,
   "min_gradient_pct": -10.814261876773458
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.156399710894036,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 697.0,
   "end_distance_m": 797.0,
   "start_elevation_m": 84.04163968705807,
   "end_elevation_m": 100.1980393979521,
   "min_gradient_pct": -7.07573709250164
  }
 ],
 "shape": {
  "ascent_concentration": 0.46,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 121.0,
  "shape_class": "stepped"
 },
 "length_m": 983.9999999999961,
 "start_elevation_m": 57.35231395227047,
 "end_elevation_m": 113.03882109786477,
 "endpoint_gain_m": 55.6865071455943,
 "overall_gradient_pct": 5.659197880649849,
 "accumulated_ascent_m": 74.00586118058906,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 36.570999841180196,
   "start_distance_m": 777.0,
   "end_distance_m": 782.0,
   "midpoint_distance_m": 779.5,
   "start_elevation_m": 96.13158212317222,
   "end_elevation_m": 97.96013211523123,
   "start_xy": [
    310081.73567449773,
    121263.7195135286
   ],
   "end_xy": [
    310077.08216435666,
    121265.54840482316
   ]
  },
  "max_10m": {
   "gradient_pct": 25.29206505075635,
   "start_distance_m": 128.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 133.0,
   "start_elevation_m": 60.33744738981136,
   "end_elevation_m": 62.866653894886994,
   "start_xy": [
    310648.72380746325,
    121312.92390117228
   ],
   "end_xy": [
    310638.7283798176,
    121312.621533547
   ]
  },
  "max_20m": {
   "gradient_pct": 22.67421788018428,
   "start_distance_m": 125.0,
   "end_distance_m": 145.0,
   "midpoint_distance_m": 135.0,
   "start_elevation_m": 59.79289529542876,
   "end_elevation_m": 64.32773887146561,
   "start_xy": [
    310651.72243575694,
    121313.01461145986
   ],
   "end_xy": [
    310631.7315804657,
    121312.4098762093
   ]
  },
  "max_25m": {
   "gradient_pct": 21.323278097938413,
   "start_distance_m": 124.0,
   "end_distance_m": 149.0,
   "midpoint_distance_m": 136.5,
   "start_elevation_m": 59.680320598340664,
   "end_elevation_m": 65.01114012282527,
   "start_xy": [
    310652.7219785215,
    121313.04484822239
   ],
   "end_xy": [
    310627.73340940743,
    121312.2889291592
   ]
  },
  "max_50m": {
   "gradient_pct": 18.16331417391092,
   "start_distance_m": 707.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 732.0,
   "start_elevation_m": 85.38790120013539,
   "end_elevation_m": 94.46955828709085,
   "start_xy": [
    310142.98646146985,
    121230.51295167484
   ],
   "end_xy": [
    310099.71368308703,
    121255.03975550008
   ]
  },
  "max_100m": {
   "gradient_pct": 16.156399710894036,
   "start_distance_m": 697.0,
   "end_distance_m": 797.0,
   "midpoint_distance_m": 747.0,
   "start_elevation_m": 84.04163968705807,
   "end_elevation_m": 100.1980393979521,
   "start_xy": [
    310152.54675054434,
    121227.6017056557
   ],
   "end_xy": [
    310063.0374649935,
    121270.76733589199
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -32.28782445663711,
   "start_distance_m": 186.0,
   "end_distance_m": 191.0,
   "midpoint_distance_m": 188.5,
   "start_elevation_m": 63.92910473185363,
   "end_elevation_m": 62.31471350902177,
   "start_xy": [
    310591.2009610812,
    121315.50505482925
   ],
   "end_xy": [
    310586.3412065058,
    121316.68097381726
   ]
  },
  "min_10m": {
   "gradient_pct": -22.138245154644665,
   "start_distance_m": 185.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 190.0,
   "start_elevation_m": 64.13056773318058,
   "end_elevation_m": 61.91674321771612,
   "start_xy": [
    310592.1729119963,
    121315.26987103165
   ],
   "end_xy": [
    310582.45340284536,
    121317.62170900767
   ]
  },
  "min_20m": {
   "gradient_pct": -20.25580724593098,
   "start_distance_m": 185.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 195.0,
   "start_elevation_m": 64.13056773318058,
   "end_elevation_m": 60.07940628399439,
   "start_xy": [
    310592.1729119963,
    121315.26987103165
   ],
   "end_xy": [
    310572.7338936945,
    121319.97354698369
   ]
  },
  "min_25m": {
   "gradient_pct": -17.47464738308983,
   "start_distance_m": 185.0,
   "end_distance_m": 210.0,
   "midpoint_distance_m": 197.5,
   "start_elevation_m": 64.13056773318058,
   "end_elevation_m": 59.761905887408126,
   "start_xy": [
    310592.1729119963,
    121315.26987103165
   ],
   "end_xy": [
    310567.87413911906,
    121321.1494659717
   ]
  },
  "min_50m": {
   "gradient_pct": -10.814261876773458,
   "start_distance_m": 159.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 184.0,
   "start_elevation_m": 65.20179357744746,
   "end_elevation_m": 59.79466263906073,
   "start_xy": [
    310617.73798176175,
    121311.98656153394
   ],
   "end_xy": [
    310568.8460900341,
    121320.9142821741
   ]
  },
  "min_100m": {
   "gradient_pct": -7.07573709250164,
   "start_distance_m": 170.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 220.0,
   "start_elevation_m": 64.60737390872572,
   "end_elevation_m": 57.53163681622408,
   "start_xy": [
    310606.7521757227,
    121311.74211406763
   ],
   "end_xy": [
    310510.7444346795,
    121339.22524682352
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.40194333673264,
   "start_distance_m": 779.0,
   "end_distance_m": 781.0,
   "midpoint_distance_m": 780.0,
   "start_elevation_m": 96.73190516137126,
   "end_elevation_m": 97.65994402810591,
   "start_xy": [
    310079.8742704413,
    121264.45107004643
   ],
   "end_xy": [
    310078.0128663849,
    121265.18262656424
   ]
  },
  "max_3m": {
   "gradient_pct": 40.94089846199912,
   "start_distance_m": 779.0,
   "end_distance_m": 782.0,
   "midpoint_distance_m": 780.5,
   "start_elevation_m": 96.73190516137126,
   "end_elevation_m": 97.96013211523123,
   "start_xy": [
    310079.8742704413,
    121264.45107004643
   ],
   "end_xy": [
    310077.08216435666,
    121265.54840482316
   ]
  }
 },
 "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": 8.51,
   "flagged_windows_m": [
    5
   ]
  },
  "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/ST0520.tif",
   "data/cache/england/bulk_dtm_1m/ST1020.tif"
  ],
  "calculated_at": "2026-09-05T07:15:16+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27-roads.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "summit-260905-summit-england-england-2026-08-27",
  "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": [
   "ST0520.tif",
   "ST1020.tif"
  ],
  "route_summit_trim_m": 74.2,
  "route_summit_trim_loss_m": 4.3,
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Holywell Lake",
  "county": "Somerset"
 }
}