{
 "ocl_version": "0.1.0",
 "name": "Pool Combe to Ley Hill",
 "slug": "discovered-lane-51-1908-3-6036",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.361588871137656,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 77.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 226.81142088603968,
   "end_elevation_m": 227.63865266346244,
   "min_gradient_pct": -25.237006876656665,
   "suppressed_max_gradient_pct": 60.04423277815789,
   "suppressed_location_m": [
    1.0,
    3.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.43785750697945,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 76.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 226.42551693825305,
   "end_elevation_m": 227.63865266346244,
   "min_gradient_pct": -23.60525614003753,
   "suppressed_max_gradient_pct": 48.208719654773326,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.83820086683659,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 75.0,
   "end_distance_m": 80.0,
   "start_elevation_m": 226.16456934069723,
   "end_elevation_m": 227.95647938403906,
   "min_gradient_pct": -20.95283075345037
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.07347101665022,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 76.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 226.42551693825305,
   "end_elevation_m": 229.63286403991808,
   "min_gradient_pct": -18.58865841431168
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.661339881124803,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 66.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 223.90059606369311,
   "end_elevation_m": 229.63286403991808,
   "min_gradient_pct": -17.13221629479051
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.529778978970967,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "start_elevation_m": 225.90684132408444,
   "end_elevation_m": 232.78928606882718,
   "min_gradient_pct": -16.59572203900848
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 25.415443111864708,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 64.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 223.44270995439192,
   "end_elevation_m": 236.15043151032427,
   "min_gradient_pct": -15.84266489775439
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 23.84487176374324,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 67.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 224.131162795023,
   "end_elevation_m": 247.97603455876623,
   "min_gradient_pct": -14.19969764707946
  }
 ],
 "shape": {
  "ascent_concentration": 0.724,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 195.0,
  "shape_class": "stinger"
 },
 "length_m": 1551.4584361449347,
 "start_elevation_m": 214.57211617508156,
 "end_elevation_m": 258.78332196459525,
 "endpoint_gain_m": 44.211205789513684,
 "overall_gradient_pct": 2.8496545417851946,
 "accumulated_ascent_m": 92.60734358196811,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.83820086683659,
   "start_distance_m": 75.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 77.5,
   "start_elevation_m": 226.16456934069723,
   "end_elevation_m": 227.95647938403906,
   "start_xy": [
    287586.8773444886,
    144723.41136559247
   ],
   "end_xy": [
    287591.8448021797,
    144723.97863311745
   ]
  },
  "max_10m": {
   "gradient_pct": 32.07347101665022,
   "start_distance_m": 76.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 81.0,
   "start_elevation_m": 226.42551693825305,
   "end_elevation_m": 229.63286403991808,
   "start_xy": [
    287587.87072883814,
    144723.52620258168
   ],
   "end_xy": [
    287597.8401090306,
    144724.2159004016
   ]
  },
  "max_20m": {
   "gradient_pct": 28.661339881124803,
   "start_distance_m": 66.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 223.90059606369311,
   "end_elevation_m": 229.63286403991808,
   "start_xy": [
    287577.93688534276,
    144722.37783268964
   ],
   "end_xy": [
    287597.8401090306,
    144724.2159004016
   ]
  },
  "max_25m": {
   "gradient_pct": 27.529778978970967,
   "start_distance_m": 74.0,
   "end_distance_m": 99.0,
   "midpoint_distance_m": 86.5,
   "start_elevation_m": 225.90684132408444,
   "end_elevation_m": 232.78928606882718,
   "start_xy": [
    287585.88396013906,
    144723.29652860327
   ],
   "end_xy": [
    287610.8299405408,
    144724.72997951732
   ]
  },
  "max_50m": {
   "gradient_pct": 25.415443111864708,
   "start_distance_m": 64.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 89.0,
   "start_elevation_m": 223.44270995439192,
   "end_elevation_m": 236.15043151032427,
   "start_xy": [
    287575.9501166436,
    144722.14815871126
   ],
   "end_xy": [
    287625.73299357126,
    144723.4038759853
   ]
  },
  "max_100m": {
   "gradient_pct": 23.84487176374324,
   "start_distance_m": 67.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 117.0,
   "start_elevation_m": 224.131162795023,
   "end_elevation_m": 247.97603455876623,
   "start_xy": [
    287578.93026969227,
    144722.49266967885
   ],
   "end_xy": [
    287676.67880285735,
    144709.03248393117
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.95283075345037,
   "start_distance_m": 1535.0,
   "end_distance_m": 1540.0,
   "midpoint_distance_m": 1537.5,
   "start_elevation_m": 261.8512359161585,
   "end_elevation_m": 260.80359437848597,
   "start_xy": [
    288845.01744481665,
    145169.20082475548
   ],
   "end_xy": [
    288849.7829507995,
    145170.7140837312
   ]
  },
  "min_10m": {
   "gradient_pct": -18.58865841431168,
   "start_distance_m": 1534.0,
   "end_distance_m": 1544.0,
   "midpoint_distance_m": 1539.0,
   "start_elevation_m": 261.99094022236517,
   "end_elevation_m": 260.132074380934,
   "start_xy": [
    288844.0643436201,
    145168.89817296035
   ],
   "end_xy": [
    288853.5953555858,
    145171.92469091178
   ]
  },
  "min_20m": {
   "gradient_pct": -17.13221629479051,
   "start_distance_m": 1531.0,
   "end_distance_m": 1551.0,
   "midpoint_distance_m": 1541.0,
   "start_elevation_m": 262.30396768579294,
   "end_elevation_m": 258.87752442683484,
   "start_xy": [
    288841.2050400304,
    145167.9902175749
   ],
   "end_xy": [
    288860.2670639617,
    145174.04325347778
   ]
  },
  "min_25m": {
   "gradient_pct": -16.59572203900848,
   "start_distance_m": 1526.0,
   "end_distance_m": 1551.0,
   "midpoint_distance_m": 1538.5,
   "start_elevation_m": 263.02645493658696,
   "end_elevation_m": 258.87752442683484,
   "start_xy": [
    288836.43953404756,
    145166.4769585992
   ],
   "end_xy": [
    288860.2670639617,
    145174.04325347778
   ]
  },
  "min_50m": {
   "gradient_pct": -15.84266489775439,
   "start_distance_m": 1501.0,
   "end_distance_m": 1551.0,
   "midpoint_distance_m": 1526.0,
   "start_elevation_m": 266.79885687571203,
   "end_elevation_m": 258.87752442683484,
   "start_xy": [
    288812.6120041334,
    145158.91066372063
   ],
   "end_xy": [
    288860.2670639617,
    145174.04325347778
   ]
  },
  "min_100m": {
   "gradient_pct": -14.19969764707946,
   "start_distance_m": 1451.0,
   "end_distance_m": 1551.0,
   "midpoint_distance_m": 1501.0,
   "start_elevation_m": 273.0772220739143,
   "end_elevation_m": 258.87752442683484,
   "start_xy": [
    288767.2017256469,
    145138.423589555
   ],
   "end_xy": [
    288860.2670639617,
    145174.04325347778
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.361588871137656,
   "start_distance_m": 77.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 78.0,
   "start_elevation_m": 226.81142088603968,
   "end_elevation_m": 227.63865266346244,
   "start_xy": [
    287588.86411318765,
    144723.64103957085
   ],
   "end_xy": [
    287590.8508818867,
    144723.87071354926
   ]
  },
  "max_3m": {
   "gradient_pct": 40.43785750697945,
   "start_distance_m": 76.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 77.5,
   "start_elevation_m": 226.42551693825305,
   "end_elevation_m": 227.63865266346244,
   "start_xy": [
    287587.87072883814,
    144723.52620258168
   ],
   "end_xy": [
    287590.8508818867,
    144723.87071354926
   ]
  }
 },
 "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": 0.022,
   "obstruction_max_height_m": 8.74,
   "flagged_windows_m": [
    2,
    3,
    5,
    10
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.014,
   "windows_resited": [
    2.0,
    3.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    20.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 675.0,
  "trailing_descent_m": 42.8
 },
 "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/SS8540.tif",
   "data/cache/england/bulk_dtm_1m/SS8545.tif"
  ],
  "calculated_at": "2026-08-15T05:17:19+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.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": [
   "SS8540.tif",
   "SS8545.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.8% over 200 m (Terrain 50), gain 41.8 m over 1546 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.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.1908, -3.6036)'"
 },
 "area": {
  "place": "Pool Combe",
  "county": "Somerset"
 }
}