{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (53.6098, -2.2792)",
 "slug": "discovered-lane-53-6098-2-2792",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.345819381016724,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1259.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 174.02075461430087,
   "end_elevation_m": 174.6076710019212,
   "min_gradient_pct": -65.32414792592647,
   "suppressed_max_gradient_pct": 43.152699121625915,
   "suppressed_location_m": [
    1199.0,
    1201.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.715998666598313,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1258.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 173.77619104192325,
   "end_elevation_m": 174.6076710019212,
   "min_gradient_pct": -58.971765624721684,
   "suppressed_max_gradient_pct": 40.63352399432082,
   "suppressed_location_m": [
    1198.0,
    1201.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.30592972495367,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1257.0,
   "end_distance_m": 1262.0,
   "start_elevation_m": 173.5654742125186,
   "end_elevation_m": 174.7307706987663,
   "min_gradient_pct": -48.27532357996802,
   "suppressed_max_gradient_pct": 38.94666687468202,
   "suppressed_location_m": [
    1187.0,
    1192.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.47718036496343,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1251.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 172.45995296542486,
   "end_elevation_m": 174.6076710019212,
   "min_gradient_pct": -41.47325922499391,
   "suppressed_max_gradient_pct": 37.86695207092151,
   "suppressed_location_m": [
    1182.0,
    1192.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.353687609535456,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1241.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 170.5369334800141,
   "end_elevation_m": 174.6076710019212,
   "min_gradient_pct": -31.250419559356146,
   "suppressed_max_gradient_pct": 34.38468066754595,
   "suppressed_location_m": [
    1181.0,
    1201.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.048188901190883,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1236.0,
   "end_distance_m": 1261.0,
   "start_elevation_m": 169.59562377662348,
   "end_elevation_m": 174.6076710019212,
   "min_gradient_pct": -25.6918906000044,
   "suppressed_max_gradient_pct": 30.58284896196119,
   "suppressed_location_m": [
    1178.0,
    1203.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.038002728688525,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1239.0,
   "end_distance_m": 1289.0,
   "start_elevation_m": 170.10568454529204,
   "end_elevation_m": 178.6246859096363,
   "min_gradient_pct": -13.713247225548287,
   "suppressed_max_gradient_pct": 19.060924604534364,
   "suppressed_location_m": [
    1180.0,
    1230.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.345800316472806,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1235.0,
   "end_distance_m": 1335.0,
   "start_elevation_m": 169.4660959491711,
   "end_elevation_m": 184.8118962656439,
   "min_gradient_pct": -4.5781334183632225,
   "suppressed_max_gradient_pct": 17.78464947163306,
   "suppressed_location_m": [
    1180.0,
    1280.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.422,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 75.0,
  "shape_class": "sustained"
 },
 "length_m": 1425.958529741358,
 "start_elevation_m": 109.26348245910623,
 "end_elevation_m": 187.24646920873954,
 "endpoint_gain_m": 77.98298674963331,
 "overall_gradient_pct": 5.468811688638516,
 "accumulated_ascent_m": 89.25294262248212,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.30592972495367,
   "start_distance_m": 1257.0,
   "end_distance_m": 1262.0,
   "midpoint_distance_m": 1259.5,
   "start_elevation_m": 173.5654742125186,
   "end_elevation_m": 174.7307706987663,
   "start_xy": [
    381727.08441742294,
    412827.26065958064
   ],
   "end_xy": [
    381731.19817150355,
    412830.10267072846
   ]
  },
  "max_10m": {
   "gradient_pct": 21.47718036496343,
   "start_distance_m": 1251.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1256.0,
   "start_elevation_m": 172.45995296542486,
   "end_elevation_m": 174.6076710019212,
   "start_xy": [
    381722.1479125262,
    412823.85024620325
   ],
   "end_xy": [
    381730.37542068743,
    412829.5342684989
   ]
  },
  "max_20m": {
   "gradient_pct": 20.353687609535456,
   "start_distance_m": 1241.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1251.0,
   "start_elevation_m": 170.5369334800141,
   "end_elevation_m": 174.6076710019212,
   "start_xy": [
    381713.920404365,
    412818.16622390767
   ],
   "end_xy": [
    381730.37542068743,
    412829.5342684989
   ]
  },
  "max_25m": {
   "gradient_pct": 20.048188901190883,
   "start_distance_m": 1236.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1248.5,
   "start_elevation_m": 169.59562377662348,
   "end_elevation_m": 174.6076710019212,
   "start_xy": [
    381709.8066502844,
    412815.32421275985
   ],
   "end_xy": [
    381730.37542068743,
    412829.5342684989
   ]
  },
  "max_50m": {
   "gradient_pct": 17.038002728688525,
   "start_distance_m": 1239.0,
   "end_distance_m": 1289.0,
   "midpoint_distance_m": 1264.0,
   "start_elevation_m": 170.10568454529204,
   "end_elevation_m": 178.6246859096363,
   "start_xy": [
    381712.27490273275,
    412817.0294194485
   ],
   "end_xy": [
    381753.93966794695,
    412844.62193941034
   ]
  },
  "max_100m": {
   "gradient_pct": 15.345800316472806,
   "start_distance_m": 1235.0,
   "end_distance_m": 1335.0,
   "midpoint_distance_m": 1285.0,
   "start_elevation_m": 169.4660959491711,
   "end_elevation_m": 184.8118962656439,
   "start_xy": [
    381708.98389946827,
    412814.7558105303
   ],
   "end_xy": [
    381789.00701044087,
    412873.10255347186
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -48.27532357996802,
   "start_distance_m": 1131.0,
   "end_distance_m": 1136.0,
   "midpoint_distance_m": 1133.5,
   "start_elevation_m": 165.95838916938874,
   "end_elevation_m": 163.54462299039034,
   "start_xy": [
    381612.1807707957,
    412778.1902065071
   ],
   "end_xy": [
    381616.9524437767,
    412779.68390559393
   ]
  },
  "min_10m": {
   "gradient_pct": -41.47325922499391,
   "start_distance_m": 1131.0,
   "end_distance_m": 1141.0,
   "midpoint_distance_m": 1136.0,
   "start_elevation_m": 165.95838916938874,
   "end_elevation_m": 161.81106324688935,
   "start_xy": [
    381612.1807707957,
    412778.1902065071
   ],
   "end_xy": [
    381621.72411675774,
    412781.17760468076
   ]
  },
  "min_20m": {
   "gradient_pct": -31.250419559356146,
   "start_distance_m": 1130.0,
   "end_distance_m": 1150.0,
   "midpoint_distance_m": 1140.0,
   "start_elevation_m": 166.05554669000298,
   "end_elevation_m": 159.80546277813175,
   "start_xy": [
    381611.22643619945,
    412777.8914666897
   ],
   "end_xy": [
    381630.3131281236,
    412783.8662630371
   ]
  },
  "min_25m": {
   "gradient_pct": -25.6918906000044,
   "start_distance_m": 1130.0,
   "end_distance_m": 1155.0,
   "midpoint_distance_m": 1142.5,
   "start_elevation_m": 166.05554669000298,
   "end_elevation_m": 159.63257404000188,
   "start_xy": [
    381611.22643619945,
    412777.8914666897
   ],
   "end_xy": [
    381635.0848011046,
    412785.3599621239
   ]
  },
  "min_50m": {
   "gradient_pct": -13.713247225548287,
   "start_distance_m": 1127.0,
   "end_distance_m": 1177.0,
   "midpoint_distance_m": 1152.0,
   "start_elevation_m": 166.03844559762933,
   "end_elevation_m": 159.1818219848552,
   "start_xy": [
    381608.3387455556,
    412777.07835296396
   ],
   "end_xy": [
    381656.0801622212,
    412791.932238106
   ]
  },
  "min_100m": {
   "gradient_pct": -4.5781334183632225,
   "start_distance_m": 1080.0,
   "end_distance_m": 1180.0,
   "midpoint_distance_m": 1130.0,
   "start_elevation_m": 163.89148248548116,
   "end_elevation_m": 159.31334906711794,
   "start_xy": [
    381615.73880328634,
    412739.4598476662
   ],
   "end_xy": [
    381658.94316600985,
    412792.82845755806
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.345819381016724,
   "start_distance_m": 1259.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1260.0,
   "start_elevation_m": 174.02075461430087,
   "end_elevation_m": 174.6076710019212,
   "start_xy": [
    381728.7299190552,
    412828.39746403974
   ],
   "end_xy": [
    381730.37542068743,
    412829.5342684989
   ]
  },
  "max_3m": {
   "gradient_pct": 27.715998666598313,
   "start_distance_m": 1258.0,
   "end_distance_m": 1261.0,
   "midpoint_distance_m": 1259.5,
   "start_elevation_m": 173.77619104192325,
   "end_elevation_m": 174.6076710019212,
   "start_xy": [
    381727.90716823906,
    412827.8290618102
   ],
   "end_xy": [
    381730.37542068743,
    412829.5342684989
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.065,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.084,
   "obstruction_max_height_m": 10.87,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    1122.0,
    1213.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_end"
  ]
 },
 "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/SD8010.tif"
  ],
  "calculated_at": "2026-09-05T02:35:02+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/mnt/HC_Volume_106794610/hunt-gb/regions/region-13.osm.pbf",
  "osm_snapshot": "",
  "run_id": "hunt-england-260905",
  "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": [
   "SD8010.tif"
  ],
  "climb_origin": "discovered",
  "mask_basin_extension_m": 2.0,
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Chesham",
  "county": ""
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    1133.0,
    1257.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}