{
 "ocl_version": "0.1.0",
 "name": "Lane near Woodland Head",
 "slug": "discovered-lane-50-7594-3-7593",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 53.3388204474619,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 381.0,
   "end_distance_m": 383.0,
   "start_elevation_m": 130.06742911738678,
   "end_elevation_m": 131.13420552633602,
   "min_gradient_pct": -12.983187041906774
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 48.230223270189754,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 380.0,
   "end_distance_m": 383.0,
   "start_elevation_m": 129.68729882823033,
   "end_elevation_m": 131.13420552633602,
   "min_gradient_pct": -9.24453479804015
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 41.237909869394116,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 378.0,
   "end_distance_m": 383.0,
   "start_elevation_m": 129.0723100328663,
   "end_elevation_m": 131.13420552633602,
   "min_gradient_pct": -10.43026467083564
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 35.80188332621617,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 374.0,
   "end_distance_m": 384.0,
   "start_elevation_m": 127.78306381511388,
   "end_elevation_m": 131.3632521477355,
   "min_gradient_pct": -4.191348038229705
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.90489882279516,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 370.0,
   "end_distance_m": 390.0,
   "start_elevation_m": 127.15348781892808,
   "end_elevation_m": 132.73446758348712,
   "min_gradient_pct": -3.336959116620477
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.914269118662613,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 365.0,
   "end_distance_m": 390.0,
   "start_elevation_m": 126.50590030382146,
   "end_elevation_m": 132.73446758348712,
   "min_gradient_pct": -3.0375132219771785
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.194497145749665,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 339.0,
   "end_distance_m": 389.0,
   "start_elevation_m": 122.46329458146329,
   "end_elevation_m": 132.56054315433812,
   "min_gradient_pct": -1.3408760076115982
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.386514162789723,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 290.0,
   "end_distance_m": 390.0,
   "start_elevation_m": 115.3479534206974,
   "end_elevation_m": 132.73446758348712,
   "min_gradient_pct": 0.4567669377535708
  }
 ],
 "shape": {
  "ascent_concentration": 0.428,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 },
 "length_m": 1097.202430388047,
 "start_elevation_m": 92.59058871795646,
 "end_elevation_m": 172.4763843940917,
 "endpoint_gain_m": 79.88579567613523,
 "overall_gradient_pct": 7.280862078284137,
 "accumulated_ascent_m": 82.73233106818779,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 41.237909869394116,
   "start_distance_m": 378.0,
   "end_distance_m": 383.0,
   "midpoint_distance_m": 380.5,
   "start_elevation_m": 129.0723100328663,
   "end_elevation_m": 131.13420552633602,
   "start_xy": [
    275835.09547760047,
    97108.53927172464
   ],
   "end_xy": [
    275832.0774493726,
    97112.52568685806
   ]
  },
  "max_10m": {
   "gradient_pct": 35.80188332621617,
   "start_distance_m": 374.0,
   "end_distance_m": 384.0,
   "midpoint_distance_m": 379.0,
   "start_elevation_m": 127.78306381511388,
   "end_elevation_m": 131.3632521477355,
   "start_xy": [
    275837.5099001828,
    97105.3501396179
   ],
   "end_xy": [
    275831.4738437271,
    97113.32296988474
   ]
  },
  "max_20m": {
   "gradient_pct": 27.90489882279516,
   "start_distance_m": 370.0,
   "end_distance_m": 390.0,
   "midpoint_distance_m": 380.0,
   "start_elevation_m": 127.15348781892808,
   "end_elevation_m": 132.73446758348712,
   "start_xy": [
    275839.92432276503,
    97102.16100751117
   ],
   "end_xy": [
    275827.83988997975,
    97118.09384009842
   ]
  },
  "max_25m": {
   "gradient_pct": 24.914269118662613,
   "start_distance_m": 365.0,
   "end_distance_m": 390.0,
   "midpoint_distance_m": 377.5,
   "start_elevation_m": 126.50590030382146,
   "end_elevation_m": 132.73446758348712,
   "start_xy": [
    275842.9423509929,
    97098.17459237776
   ],
   "end_xy": [
    275827.83988997975,
    97118.09384009842
   ]
  },
  "max_50m": {
   "gradient_pct": 20.194497145749665,
   "start_distance_m": 339.0,
   "end_distance_m": 389.0,
   "midpoint_distance_m": 364.0,
   "start_elevation_m": 122.46329458146329,
   "end_elevation_m": 132.56054315433812,
   "start_xy": [
    275863.55841453216,
    97082.48660323495
   ],
   "end_xy": [
    275828.45581549924,
    97117.30938501816
   ]
  },
  "max_100m": {
   "gradient_pct": 17.386514162789723,
   "start_distance_m": 290.0,
   "end_distance_m": 390.0,
   "midpoint_distance_m": 340.0,
   "start_elevation_m": 115.3479534206974,
   "end_elevation_m": 132.73446758348712,
   "start_xy": [
    275904.53589657624,
    97056.04998752697
   ],
   "end_xy": [
    275827.83988997975,
    97118.09384009842
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.43026467083564,
   "start_distance_m": 401.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 403.5,
   "start_elevation_m": 133.280793616735,
   "end_elevation_m": 132.75928038319321,
   "start_xy": [
    275818.8087547287,
    97124.3738557096
   ],
   "end_xy": [
    275814.7036932509,
    97127.22840826013
   ]
  },
  "min_10m": {
   "gradient_pct": -4.191348038229705,
   "start_distance_m": 1038.0,
   "end_distance_m": 1048.0,
   "midpoint_distance_m": 1043.0,
   "start_elevation_m": 171.76083385020044,
   "end_elevation_m": 171.34169904637747,
   "start_xy": [
    275403.0614690716,
    96858.30469939174
   ],
   "end_xy": [
    275407.893420213,
    96849.6225155003
   ]
  },
  "min_20m": {
   "gradient_pct": -3.336959116620477,
   "start_distance_m": 1028.0,
   "end_distance_m": 1048.0,
   "midpoint_distance_m": 1038.0,
   "start_elevation_m": 172.00909086970157,
   "end_elevation_m": 171.34169904637747,
   "start_xy": [
    275397.4557147053,
    96866.58573302196
   ],
   "end_xy": [
    275407.893420213,
    96849.6225155003
   ]
  },
  "min_25m": {
   "gradient_pct": -3.0375132219771785,
   "start_distance_m": 1023.0,
   "end_distance_m": 1048.0,
   "midpoint_distance_m": 1035.5,
   "start_elevation_m": 172.10107735187177,
   "end_elevation_m": 171.34169904637747,
   "start_xy": [
    275394.65283752215,
    96870.72624983707
   ],
   "end_xy": [
    275407.893420213,
    96849.6225155003
   ]
  },
  "min_50m": {
   "gradient_pct": -1.3408760076115982,
   "start_distance_m": 1001.0,
   "end_distance_m": 1051.0,
   "midpoint_distance_m": 1026.0,
   "start_elevation_m": 172.02755167415637,
   "end_elevation_m": 171.35711367035057,
   "start_xy": [
    275376.971236603,
    96880.15216700072
   ],
   "end_xy": [
    275408.0416182426,
    96846.67076084558
   ]
  },
  "min_100m": {
   "gradient_pct": 0.4567669377535708,
   "start_distance_m": 996.0,
   "end_distance_m": 1096.0,
   "midpoint_distance_m": 1046.0,
   "start_elevation_m": 172.01163703655874,
   "end_elevation_m": 172.4684039743123,
   "start_xy": [
    275372.1159329392,
    96878.95800355612
   ],
   "end_xy": [
    275379.82621617016,
    96812.39420243625
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 53.3388204474619,
   "start_distance_m": 381.0,
   "end_distance_m": 383.0,
   "midpoint_distance_m": 382.0,
   "start_elevation_m": 130.06742911738678,
   "end_elevation_m": 131.13420552633602,
   "start_xy": [
    275833.2846606638,
    97110.93112080469
   ],
   "end_xy": [
    275832.0774493726,
    97112.52568685806
   ]
  },
  "max_3m": {
   "gradient_pct": 48.230223270189754,
   "start_distance_m": 380.0,
   "end_distance_m": 383.0,
   "midpoint_distance_m": 381.5,
   "start_elevation_m": 129.68729882823033,
   "end_elevation_m": 131.13420552633602,
   "start_xy": [
    275833.88826630934,
    97110.133837778
   ],
   "end_xy": [
    275832.0774493726,
    97112.52568685806
   ]
  }
 },
 "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": 0.045,
   "obstruction_max_height_m": 13.61,
   "flagged_windows_m": []
  },
  "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/SX7595.tif"
  ],
  "calculated_at": "2026-09-04T07:54:58+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "hs-bench-260904",
  "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": [
   "SX7595.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Woodland Head",
  "county": "Devon"
 }
}