{
 "ocl_version": "0.1.0",
 "name": "Lane near St Pinnock",
 "slug": "discovered-lane-50-4402-4-5419",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.520422905163343,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 38.0,
   "end_distance_m": 40.0,
   "start_elevation_m": 96.82881681784977,
   "end_elevation_m": 97.35922527595304,
   "min_gradient_pct": -6.600788762807497
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.987234657149788,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 41.0,
   "end_distance_m": 44.0,
   "start_elevation_m": 97.51720880490038,
   "end_elevation_m": 98.26682584461487,
   "min_gradient_pct": -4.896112736295777
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.354544386628163,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 38.0,
   "end_distance_m": 43.0,
   "start_elevation_m": 96.82881681784977,
   "end_elevation_m": 98.04654403718118,
   "min_gradient_pct": -0.5287014126633949
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.526638383753266,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 34.0,
   "end_distance_m": 44.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 98.26682584461487,
   "min_gradient_pct": 2.3237591147332637
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.983328727332662,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 34.0,
   "end_distance_m": 54.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 100.21082775170608,
   "min_gradient_pct": 2.836004245321959,
   "suppressed_max_gradient_pct": 21.16389465775697,
   "suppressed_location_m": [
    29.0,
    49.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.60715395298655,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 33.0,
   "end_distance_m": 58.0,
   "start_elevation_m": 95.84950133409095,
   "end_elevation_m": 101.00128982233758,
   "min_gradient_pct": 2.881916432062951,
   "suppressed_max_gradient_pct": 20.745150984222278,
   "suppressed_location_m": [
    24.0,
    49.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.919881050312597,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 34.0,
   "end_distance_m": 84.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 105.97410253139584,
   "min_gradient_pct": 3.1980794450896894,
   "suppressed_max_gradient_pct": 19.967957217289978,
   "suppressed_location_m": [
    31.0,
    81.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.964665044618158,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 33.0,
   "end_distance_m": 133.0,
   "start_elevation_m": 95.84950133409095,
   "end_elevation_m": 113.8141663787091,
   "min_gradient_pct": 3.723539021253032,
   "suppressed_max_gradient_pct": 19.38849712651856,
   "suppressed_location_m": [
    14.0,
    114.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.391,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "sustained"
 },
 "length_m": 901.7678676645303,
 "start_elevation_m": 90.44445677557509,
 "end_elevation_m": 162.82065270361284,
 "endpoint_gain_m": 72.37619592803775,
 "overall_gradient_pct": 8.026034029742414,
 "accumulated_ascent_m": 72.76795330130264,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.354544386628163,
   "start_distance_m": 38.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 40.5,
   "start_elevation_m": 96.82881681784977,
   "end_elevation_m": 98.04654403718118,
   "start_xy": [
    220108.7626647858,
    63334.69583958041
   ],
   "end_xy": [
    220104.7096646278,
    63331.767839466396
   ]
  },
  "max_10m": {
   "gradient_pct": 22.526638383753266,
   "start_distance_m": 34.0,
   "end_distance_m": 44.0,
   "midpoint_distance_m": 39.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 98.26682584461487,
   "start_xy": [
    220112.00467226005,
    63337.03878264739
   ],
   "end_xy": [
    220103.90158439407,
    63331.17925122242
   ]
  },
  "max_20m": {
   "gradient_pct": 20.983328727332662,
   "start_distance_m": 34.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 44.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 100.21082775170608,
   "start_xy": [
    220112.00467226005,
    63337.03878264739
   ],
   "end_xy": [
    220096.68688831906,
    63324.25490359699
   ]
  },
  "max_25m": {
   "gradient_pct": 20.60715395298655,
   "start_distance_m": 33.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 45.5,
   "start_elevation_m": 95.84950133409095,
   "end_elevation_m": 101.00128982233758,
   "start_xy": [
    220112.81566455885,
    63337.623839416665
   ],
   "end_xy": [
    220093.80449694878,
    63321.48149081319
   ]
  },
  "max_50m": {
   "gradient_pct": 19.919881050312597,
   "start_distance_m": 34.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 59.0,
   "start_elevation_m": 96.01416200623954,
   "end_elevation_m": 105.97410253139584,
   "start_xy": [
    220112.00467226005,
    63337.03878264739
   ],
   "end_xy": [
    220074.32984824924,
    63304.291431296624
   ]
  },
  "max_100m": {
   "gradient_pct": 17.964665044618158,
   "start_distance_m": 33.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 83.0,
   "start_elevation_m": 95.84950133409095,
   "end_elevation_m": 113.8141663787091,
   "start_xy": [
    220112.81566455885,
    63337.623839416665
   ],
   "end_xy": [
    220038.48428217496,
    63271.196478696336
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.5287014126633949,
   "start_distance_m": 666.0,
   "end_distance_m": 671.0,
   "midpoint_distance_m": 668.5,
   "start_elevation_m": 141.02078839213866,
   "end_elevation_m": 140.99435332150549,
   "start_xy": [
    219552.58595770385,
    63100.182595460836
   ],
   "end_xy": [
    219548.89641176432,
    63096.80809612592
   ]
  },
  "min_10m": {
   "gradient_pct": 2.3237591147332637,
   "start_distance_m": 483.0,
   "end_distance_m": 493.0,
   "midpoint_distance_m": 488.0,
   "start_elevation_m": 129.81202236287544,
   "end_elevation_m": 130.04439827434877,
   "start_xy": [
    219723.68255407212,
    63160.408735977486
   ],
   "end_xy": [
    219714.09291225302,
    63157.57346723656
   ]
  },
  "min_20m": {
   "gradient_pct": 2.836004245321959,
   "start_distance_m": 355.0,
   "end_distance_m": 375.0,
   "midpoint_distance_m": 365.0,
   "start_elevation_m": 124.24834309267139,
   "end_elevation_m": 124.81554394173578,
   "start_xy": [
    219847.10592621894,
    63194.21479108649
   ],
   "end_xy": [
    219827.69684536936,
    63189.38907910723
   ]
  },
  "min_25m": {
   "gradient_pct": 2.881916432062951,
   "start_distance_m": 347.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 359.5,
   "start_elevation_m": 124.0051115419252,
   "end_elevation_m": 124.72559064994094,
   "start_xy": [
    219854.87175296518,
    63196.13621335946
   ],
   "end_xy": [
    219830.60820631098,
    63190.112939980376
   ]
  },
  "min_50m": {
   "gradient_pct": 3.1980794450896894,
   "start_distance_m": 344.0,
   "end_distance_m": 394.0,
   "midpoint_distance_m": 369.0,
   "start_elevation_m": 123.90066174292647,
   "end_elevation_m": 125.49970146547132,
   "start_xy": [
    219857.7845895847,
    63196.854113800546
   ],
   "end_xy": [
    219809.25816924224,
    63184.804851654604
   ]
  },
  "min_100m": {
   "gradient_pct": 3.723539021253032,
   "start_distance_m": 311.0,
   "end_distance_m": 411.0,
   "midpoint_distance_m": 361.0,
   "start_elevation_m": 122.51942671075547,
   "end_elevation_m": 126.2429657320085,
   "start_xy": [
    219889.75976043838,
    63205.001545253166
   ],
   "end_xy": [
    219792.76045420166,
    63180.70298192021
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.520422905163343,
   "start_distance_m": 38.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 39.0,
   "start_elevation_m": 96.82881681784977,
   "end_elevation_m": 97.35922527595304,
   "start_xy": [
    220108.7626647858,
    63334.69583958041
   ],
   "end_xy": [
    220107.14145577868,
    63333.524652387554
   ]
  },
  "max_3m": {
   "gradient_pct": 24.987234657149788,
   "start_distance_m": 41.0,
   "end_distance_m": 44.0,
   "midpoint_distance_m": 42.5,
   "start_elevation_m": 97.51720880490038,
   "end_elevation_m": 98.26682584461487,
   "start_xy": [
    220106.33090361283,
    63332.93898594262
   ],
   "end_xy": [
    220103.90158439407,
    63331.17925122242
   ]
  }
 },
 "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": 0.019,
   "obstruction_max_height_m": 12.52,
   "flagged_windows_m": []
  },
  "structure_suppression": {
   "masked_fraction": 0.037,
   "windows_resited": [
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    32.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_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/SX1560.tif",
   "data/cache/england/bulk_dtm_1m/SX2060.tif"
  ],
  "calculated_at": "2026-08-19T18:11:44+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SX1560.tif",
   "SX2060.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.7% over 200 m (Terrain 50), gain 45.7 m over 696 m way. EXTENDED by graph walk: +3 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-50-4416-4-5358 ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (50.4402, -4.5419)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4402, -4.5419)'"
 },
 "area": {
  "place": "Trevelmond",
  "county": "Cornwall"
 }
}