{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.8536, -2.7576)",
 "slug": "discovered-lane-51-8536-2-7576",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 31.78524562462499,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1201.0,
   "end_distance_m": 1203.0,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 95.42296227641016,
   "min_gradient_pct": -27.07071210981198
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.092464515051518,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1201.0,
   "end_distance_m": 1204.0,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 95.6000312993692,
   "min_gradient_pct": -23.128069756034126
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.160372232290285,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1201.0,
   "end_distance_m": 1206.0,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 96.09527597553218,
   "min_gradient_pct": -20.626004167171743
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.052517499503153,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1196.0,
   "end_distance_m": 1206.0,
   "start_elevation_m": 93.79002422558186,
   "end_elevation_m": 96.09527597553218,
   "min_gradient_pct": -18.33588331627425
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 18.643476519046445,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 1234.0,
   "end_distance_m": 1254.0,
   "start_elevation_m": 99.13006108787313,
   "end_elevation_m": 102.85875639168242,
   "min_gradient_pct": -16.27705325650858,
   "suppressed_max_gradient_pct": 22.527789374623026,
   "suppressed_location_m": [
    970.0,
    990.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 18.169299444529315,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 1229.0,
   "end_distance_m": 1254.0,
   "start_elevation_m": 98.31643153055009,
   "end_elevation_m": 102.85875639168242,
   "min_gradient_pct": -15.106213981924043,
   "suppressed_max_gradient_pct": 21.804700659158925,
   "suppressed_location_m": [
    965.0,
    990.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.004957760990365,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 130.0,
   "end_distance_m": 180.0,
   "start_elevation_m": 46.641825895449806,
   "end_elevation_m": 55.14430477594499,
   "min_gradient_pct": -13.422607173445526,
   "suppressed_max_gradient_pct": 17.747300671484282,
   "suppressed_location_m": [
    960.0,
    1010.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.506794078247893,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 78.0,
   "end_distance_m": 178.0,
   "start_elevation_m": 38.32739913735733,
   "end_elevation_m": 54.834193215605225,
   "min_gradient_pct": -11.174332559712298
  }
 ],
 "shape": {
  "ascent_concentration": 0.376,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 215.0,
  "shape_class": "sustained"
 },
 "length_m": 1463.0000000000039,
 "start_elevation_m": 32.44874094434268,
 "end_elevation_m": 115.94288315462411,
 "endpoint_gain_m": 83.49414221028144,
 "overall_gradient_pct": 5.70705004854964,
 "accumulated_ascent_m": 104.83964834233605,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.160372232290285,
   "start_distance_m": 1201.0,
   "end_distance_m": 1206.0,
   "midpoint_distance_m": 1203.5,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 96.09527597553218,
   "start_xy": [
    348627.4469370313,
    217505.39899392202
   ],
   "end_xy": [
    348632.44427927636,
    217505.5619791953
   ]
  },
  "max_10m": {
   "gradient_pct": 23.052517499503153,
   "start_distance_m": 1196.0,
   "end_distance_m": 1206.0,
   "midpoint_distance_m": 1201.0,
   "start_elevation_m": 93.79002422558186,
   "end_elevation_m": 96.09527597553218,
   "start_xy": [
    348622.449595349,
    217505.23598963613
   ],
   "end_xy": [
    348632.44427927636,
    217505.5619791953
   ]
  },
  "max_20m": {
   "gradient_pct": 18.643476519046445,
   "start_distance_m": 1234.0,
   "end_distance_m": 1254.0,
   "midpoint_distance_m": 1244.0,
   "start_elevation_m": 99.13006108787313,
   "end_elevation_m": 102.85875639168242,
   "start_xy": [
    348660.4293935151,
    217506.47477136384
   ],
   "end_xy": [
    348680.4187861645,
    217507.12598894344
   ]
  },
  "max_25m": {
   "gradient_pct": 18.169299444529315,
   "start_distance_m": 1229.0,
   "end_distance_m": 1254.0,
   "midpoint_distance_m": 1241.5,
   "start_elevation_m": 98.31643153055009,
   "end_elevation_m": 102.85875639168242,
   "start_xy": [
    348655.43205127784,
    217506.3117856409
   ],
   "end_xy": [
    348680.4187861645,
    217507.12598894344
   ]
  },
  "max_50m": {
   "gradient_pct": 17.004957760990365,
   "start_distance_m": 130.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 155.0,
   "start_elevation_m": 46.641825895449806,
   "end_elevation_m": 55.14430477594499,
   "start_xy": [
    347830.32791137416,
    217398.73091997398
   ],
   "end_xy": [
    347866.19992668804,
    217433.5279250099
   ]
  },
  "max_100m": {
   "gradient_pct": 16.506794078247893,
   "start_distance_m": 78.0,
   "end_distance_m": 178.0,
   "midpoint_distance_m": 128.0,
   "start_elevation_m": 38.32739913735733,
   "end_elevation_m": 54.834193215605225,
   "start_xy": [
    347791.489079506,
    217364.16406558474
   ],
   "end_xy": [
    347864.80180490366,
    217432.09780072302
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.626004167171743,
   "start_distance_m": 858.0,
   "end_distance_m": 863.0,
   "midpoint_distance_m": 860.5,
   "start_elevation_m": 74.29457567858022,
   "end_elevation_m": 73.26327547022163,
   "start_xy": [
    348291.1010283296,
    217497.42964744262
   ],
   "end_xy": [
    348295.9587742467,
    217496.2454598389
   ]
  },
  "min_10m": {
   "gradient_pct": -18.33588331627425,
   "start_distance_m": 861.0,
   "end_distance_m": 871.0,
   "midpoint_distance_m": 866.0,
   "start_elevation_m": 73.80468971241787,
   "end_elevation_m": 71.97110138079044,
   "start_xy": [
    348294.01575604494,
    217496.7194642815
   ],
   "end_xy": [
    348303.73108800576,
    217494.3504322455
   ]
  },
  "min_20m": {
   "gradient_pct": -16.27705325650858,
   "start_distance_m": 856.0,
   "end_distance_m": 876.0,
   "midpoint_distance_m": 866.0,
   "start_elevation_m": 74.50284291474895,
   "end_elevation_m": 71.24743226344724,
   "start_xy": [
    348289.157952769,
    217497.90341626544
   ],
   "end_xy": [
    348308.5888802258,
    217493.16643397167
   ]
  },
  "min_25m": {
   "gradient_pct": -15.106213981924043,
   "start_distance_m": 852.0,
   "end_distance_m": 877.0,
   "midpoint_distance_m": 864.5,
   "start_elevation_m": 74.9828582049972,
   "end_elevation_m": 71.20630470951619,
   "start_xy": [
    348285.4079167095,
    217499.21910447776
   ],
   "end_xy": [
    348309.5603725237,
    217492.92936287232
   ]
  },
  "min_50m": {
   "gradient_pct": -13.422607173445526,
   "start_distance_m": 825.0,
   "end_distance_m": 875.0,
   "midpoint_distance_m": 850.0,
   "start_elevation_m": 78.08048217366925,
   "end_elevation_m": 71.36917858694649,
   "start_xy": [
    348262.0759144164,
    217512.80646659044
   ],
   "end_xy": [
    348307.6173543209,
    217493.40336731065
   ]
  },
  "min_100m": {
   "gradient_pct": -11.174332559712298,
   "start_distance_m": 783.0,
   "end_distance_m": 883.0,
   "midpoint_distance_m": 833.0,
   "start_elevation_m": 81.8808725369982,
   "end_elevation_m": 70.7065399772859,
   "start_xy": [
    348225.7840107104,
    217533.94641041892
   ],
   "end_xy": [
    348315.38970170345,
    217491.5084775451
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 31.78524562462499,
   "start_distance_m": 1201.0,
   "end_distance_m": 1203.0,
   "midpoint_distance_m": 1202.0,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 95.42296227641016,
   "start_xy": [
    348627.4469370313,
    217505.39899392202
   ],
   "end_xy": [
    348629.4458547095,
    217505.4647793507
   ]
  },
  "max_3m": {
   "gradient_pct": 27.092464515051518,
   "start_distance_m": 1201.0,
   "end_distance_m": 1204.0,
   "midpoint_distance_m": 1202.5,
   "start_elevation_m": 94.78725736391766,
   "end_elevation_m": 95.6000312993692,
   "start_xy": [
    348627.4469370313,
    217505.39899392202
   ],
   "end_xy": [
    348630.44533601083,
    217505.49698106942
   ]
  }
 },
 "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": 0.014,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.035,
   "windows_resited": [
    20.0,
    25.0,
    50.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 965.0,
     "end_m": 990.0,
     "raw_pct": 21.8,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 970.0,
     "end_m": 990.0,
     "raw_pct": 22.53,
     "reason": "hump"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.072,
   "obstruction_max_height_m": 15.18,
   "flagged_windows_m": [
    10
   ]
  },
  "excluded_ranges_m": [
   [
    0.0,
    20.0
   ],
   [
    963.0,
    992.0
   ]
  ],
  "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/dtm_1m/E346000_N216000_2000m.tif",
   "data/cache/england/dtm_1m/E348000_N216000_2000m.tif"
  ],
  "calculated_at": "2026-09-15T20:42:36+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": "retro-260915-dogleg-all",
  "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": [
   "E346000_N216000_2000m.tif",
   "E348000_N216000_2000m.tif"
  ],
  "route_cut_m": 1463.0,
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "structure_mask_ranges_m": [
   [
    0.0,
    15.0
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "St Maughan's Green",
  "county": "Sir Fynwy - Monmouthshire"
 }
}