{
 "ocl_version": "0.1.0",
 "name": "Larrick to Newtown",
 "slug": "discovered-lane-50-5800-4-3995",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.24602569212294,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 246.0,
   "end_distance_m": 248.0,
   "start_elevation_m": 119.29687119079809,
   "end_elevation_m": 120.04179170464054,
   "min_gradient_pct": -21.57920929123236
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.70724712555441,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 245.0,
   "end_distance_m": 248.0,
   "start_elevation_m": 118.97057429087391,
   "end_elevation_m": 120.04179170464054,
   "min_gradient_pct": -16.64399509111263
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.790519509080866,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 243.0,
   "end_distance_m": 248.0,
   "start_elevation_m": 118.5522657291865,
   "end_elevation_m": 120.04179170464054,
   "min_gradient_pct": -12.557808859016859
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.420770378257032,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 153.0,
   "end_distance_m": 163.0,
   "start_elevation_m": 102.95301602434577,
   "end_elevation_m": 105.29509306217147,
   "min_gradient_pct": -7.764437193953029
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.429172154553996,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 143.0,
   "end_distance_m": 163.0,
   "start_elevation_m": 100.80925863126068,
   "end_elevation_m": 105.29509306217147,
   "min_gradient_pct": -5.894320243715754
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.37460036485385,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 138.0,
   "end_distance_m": 163.0,
   "start_elevation_m": 99.70144297095801,
   "end_elevation_m": 105.29509306217147,
   "min_gradient_pct": -5.928946438735466
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.6347082747952,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 113.0,
   "end_distance_m": 163.0,
   "start_elevation_m": 94.47773892477387,
   "end_elevation_m": 105.29509306217147,
   "min_gradient_pct": -4.918108901339565
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.93839731081694,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 108.0,
   "end_distance_m": 208.0,
   "start_elevation_m": 93.53265959892805,
   "end_elevation_m": 113.47105690974499,
   "min_gradient_pct": -2.874940322422276
  }
 ],
 "shape": {
  "ascent_concentration": 0.528,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 215.0,
  "shape_class": "stepped"
 },
 "length_m": 1287.1078592421165,
 "start_elevation_m": 82.58043811798173,
 "end_elevation_m": 158.8622665634159,
 "endpoint_gain_m": 76.28182844543416,
 "overall_gradient_pct": 5.9266073078250745,
 "accumulated_ascent_m": 86.3852546846052,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.790519509080866,
   "start_distance_m": 243.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 245.5,
   "start_elevation_m": 118.5522657291865,
   "end_elevation_m": 120.04179170464054,
   "start_xy": [
    230357.65925335395,
    78486.92585010262
   ],
   "end_xy": [
    230353.41880723147,
    78484.41510308145
   ]
  },
  "max_10m": {
   "gradient_pct": 23.420770378257032,
   "start_distance_m": 153.0,
   "end_distance_m": 163.0,
   "midpoint_distance_m": 158.0,
   "start_elevation_m": 102.95301602434577,
   "end_elevation_m": 105.29509306217147,
   "start_xy": [
    230442.60885889854,
    78516.17339016445
   ],
   "end_xy": [
    230432.99184823834,
    78513.43238712818
   ]
  },
  "max_20m": {
   "gradient_pct": 22.429172154553996,
   "start_distance_m": 143.0,
   "end_distance_m": 163.0,
   "midpoint_distance_m": 153.0,
   "start_elevation_m": 100.80925863126068,
   "end_elevation_m": 105.29509306217147,
   "start_xy": [
    230452.22586955878,
    78518.91439320073
   ],
   "end_xy": [
    230432.99184823834,
    78513.43238712818
   ]
  },
  "max_25m": {
   "gradient_pct": 22.37460036485385,
   "start_distance_m": 138.0,
   "end_distance_m": 163.0,
   "midpoint_distance_m": 150.5,
   "start_elevation_m": 99.70144297095801,
   "end_elevation_m": 105.29509306217147,
   "start_xy": [
    230457.03420529087,
    78520.28548829313
   ],
   "end_xy": [
    230432.99184823834,
    78513.43238712818
   ]
  },
  "max_50m": {
   "gradient_pct": 21.6347082747952,
   "start_distance_m": 113.0,
   "end_distance_m": 163.0,
   "midpoint_distance_m": 138.0,
   "start_elevation_m": 94.47773892477387,
   "end_elevation_m": 105.29509306217147,
   "start_xy": [
    230481.2716690071,
    78526.26194773796
   ],
   "end_xy": [
    230432.99184823834,
    78513.43238712818
   ]
  },
  "max_100m": {
   "gradient_pct": 19.93839731081694,
   "start_distance_m": 108.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 158.0,
   "start_elevation_m": 93.53265959892805,
   "end_elevation_m": 113.47105690974499,
   "start_xy": [
    230486.21061322148,
    78527.0409389297
   ],
   "end_xy": [
    230389.94506657048,
    78500.43977323532
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.557808859016859,
   "start_distance_m": 462.0,
   "end_distance_m": 467.0,
   "midpoint_distance_m": 464.5,
   "start_elevation_m": 128.77380007869323,
   "end_elevation_m": 128.14590963574238,
   "start_xy": [
    230207.28497167662,
    78330.1022387793
   ],
   "end_xy": [
    230203.18586879995,
    78327.23913758826
   ]
  },
  "min_10m": {
   "gradient_pct": -7.764437193953029,
   "start_distance_m": 414.0,
   "end_distance_m": 424.0,
   "midpoint_distance_m": 419.0,
   "start_elevation_m": 129.77306572213487,
   "end_elevation_m": 128.99662200273957,
   "start_xy": [
    230243.29041908158,
    78361.81357386231
   ],
   "end_xy": [
    230235.8410549458,
    78355.14221973665
   ]
  },
  "min_20m": {
   "gradient_pct": -5.894320243715754,
   "start_distance_m": 591.0,
   "end_distance_m": 611.0,
   "midpoint_distance_m": 601.0,
   "start_elevation_m": 131.6309492232093,
   "end_elevation_m": 130.45208517446616,
   "start_xy": [
    230102.90785074627,
    78254.55456005486
   ],
   "end_xy": [
    230088.54940547986,
    78240.63209557028
   ]
  },
  "min_25m": {
   "gradient_pct": -5.928946438735466,
   "start_distance_m": 591.0,
   "end_distance_m": 616.0,
   "midpoint_distance_m": 603.5,
   "start_elevation_m": 131.6309492232093,
   "end_elevation_m": 130.14871261352545,
   "start_xy": [
    230102.90785074627,
    78254.55456005486
   ],
   "end_xy": [
    230085.04697202143,
    78237.0667790429
   ]
  },
  "min_50m": {
   "gradient_pct": -4.918108901339565,
   "start_distance_m": 585.0,
   "end_distance_m": 635.0,
   "midpoint_distance_m": 610.0,
   "start_elevation_m": 131.83545000871493,
   "end_elevation_m": 129.37639555804515,
   "start_xy": [
    230107.21501096827,
    78258.73168428717
   ],
   "end_xy": [
    230072.25617315853,
    78223.0170326362
   ]
  },
  "min_100m": {
   "gradient_pct": -2.874940322422276,
   "start_distance_m": 578.0,
   "end_distance_m": 678.0,
   "midpoint_distance_m": 628.0,
   "start_elevation_m": 131.975292030344,
   "end_elevation_m": 129.10035170792173,
   "start_xy": [
    230112.24064627383,
    78263.60436184761
   ],
   "end_xy": [
    230047.16320520878,
    78189.0537237439
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.24602569212294,
   "start_distance_m": 246.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 247.0,
   "start_elevation_m": 119.29687119079809,
   "end_elevation_m": 120.04179170464054,
   "start_xy": [
    230354.89269858642,
    78485.76599970595
   ],
   "end_xy": [
    230353.41880723147,
    78484.41510308145
   ]
  },
  "max_3m": {
   "gradient_pct": 35.70724712555441,
   "start_distance_m": 245.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 246.5,
   "start_elevation_m": 118.97057429087391,
   "end_elevation_m": 120.04179170464054,
   "start_xy": [
    230355.81461174725,
    78486.1530001458
   ],
   "end_xy": [
    230353.41880723147,
    78484.41510308145
   ]
  }
 },
 "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": 0.097,
   "obstruction_max_height_m": 11.16,
   "flagged_windows_m": [
    2,
    3,
    5,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/SX2575.tif",
   "data/cache/england/bulk_dtm_1m/SX3075.tif"
  ],
  "calculated_at": "2026-08-19T18:14:31+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": [
   "SX2575.tif",
   "SX3075.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.0% over 200 m (Terrain 50), gain 58.5 m over 861 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (50.5800, -4.3995)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.5800, -4.3995)'"
 },
 "area": {
  "place": "Larrick",
  "county": "Cornwall"
 }
}