{
 "ocl_version": "0.1.0",
 "name": "Lane near Roskruge Beacon",
 "slug": "discovered-lane-50-0515-5-1119",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.42409381517001,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 86.0,
   "end_distance_m": 88.0,
   "start_elevation_m": 62.236998116990776,
   "end_elevation_m": 63.205479993294176,
   "min_gradient_pct": -28.2111820307847
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.57935782964116,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 86.0,
   "end_distance_m": 89.0,
   "start_elevation_m": 62.236998116990776,
   "end_elevation_m": 63.51437885188001,
   "min_gradient_pct": -24.34842454479309
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 39.777234161366124,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 83.0,
   "end_distance_m": 88.0,
   "start_elevation_m": 61.21661828522587,
   "end_elevation_m": 63.205479993294176,
   "min_gradient_pct": -20.207827249332695
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.62250617998312,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 79.0,
   "end_distance_m": 89.0,
   "start_elevation_m": 60.2521282338817,
   "end_elevation_m": 63.51437885188001,
   "min_gradient_pct": -16.324668818610917
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.230291201806107,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 75.0,
   "end_distance_m": 95.0,
   "start_elevation_m": 59.39652224464338,
   "end_elevation_m": 64.6425804850046,
   "min_gradient_pct": -14.047277654500832
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.755486814167057,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 70.0,
   "end_distance_m": 95.0,
   "start_elevation_m": 58.453708781462836,
   "end_elevation_m": 64.6425804850046,
   "min_gradient_pct": -12.997839560028467
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.957949517642017,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 45.0,
   "end_distance_m": 95.0,
   "start_elevation_m": 54.16360572618359,
   "end_elevation_m": 64.6425804850046,
   "min_gradient_pct": -11.726506720241078
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.2932781887627,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 133.0,
   "end_distance_m": 233.0,
   "start_elevation_m": 68.08147219119219,
   "end_elevation_m": 84.37475037995489,
   "min_gradient_pct": -9.9070355860119
  }
 ],
 "shape": {
  "ascent_concentration": 0.549,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 127.0,
  "shape_class": "stepped"
 },
 "length_m": 1074.91108027296,
 "start_elevation_m": 51.06889870788618,
 "end_elevation_m": 100.75607355618288,
 "endpoint_gain_m": 49.687174848296706,
 "overall_gradient_pct": 4.622445126873126,
 "accumulated_ascent_m": 67.52746448180244,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 39.777234161366124,
   "start_distance_m": 83.0,
   "end_distance_m": 88.0,
   "midpoint_distance_m": 85.5,
   "start_elevation_m": 61.21661828522587,
   "end_elevation_m": 63.205479993294176,
   "start_xy": [
    177351.4204069873,
    21742.74633667405
   ],
   "end_xy": [
    177351.72249719602,
    21737.76145933134
   ]
  },
  "max_10m": {
   "gradient_pct": 32.62250617998312,
   "start_distance_m": 79.0,
   "end_distance_m": 89.0,
   "midpoint_distance_m": 84.0,
   "start_elevation_m": 60.2521282338817,
   "end_elevation_m": 63.51437885188001,
   "start_xy": [
    177351.22055109017,
    21746.741340756696
   ],
   "end_xy": [
    177352.00508490304,
    21736.802217866512
   ]
  },
  "max_20m": {
   "gradient_pct": 26.230291201806107,
   "start_distance_m": 75.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 85.0,
   "start_elevation_m": 59.39652224464338,
   "end_elevation_m": 64.6425804850046,
   "start_xy": [
    177351.020695193,
    21750.736344839344
   ],
   "end_xy": [
    177353.7006111451,
    21731.046769077537
   ]
  },
  "max_25m": {
   "gradient_pct": 24.755486814167057,
   "start_distance_m": 70.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 82.5,
   "start_elevation_m": 58.453708781462836,
   "end_elevation_m": 64.6425804850046,
   "start_xy": [
    177350.77087532156,
    21755.730099942655
   ],
   "end_xy": [
    177353.7006111451,
    21731.046769077537
   ]
  },
  "max_50m": {
   "gradient_pct": 20.957949517642017,
   "start_distance_m": 45.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 70.0,
   "start_elevation_m": 54.16360572618359,
   "end_elevation_m": 64.6425804850046,
   "start_xy": [
    177350.05747720588,
    21780.719123209354
   ],
   "end_xy": [
    177353.7006111451,
    21731.046769077537
   ]
  },
  "max_100m": {
   "gradient_pct": 16.2932781887627,
   "start_distance_m": 133.0,
   "end_distance_m": 233.0,
   "midpoint_distance_m": 183.0,
   "start_elevation_m": 68.08147219119219,
   "end_elevation_m": 84.37475037995489,
   "start_xy": [
    177389.57399045242,
    21734.7185914538
   ],
   "end_xy": [
    177445.44317838826,
    21654.42906043078
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.207827249332695,
   "start_distance_m": 402.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 404.5,
   "start_elevation_m": 78.44882496381183,
   "end_elevation_m": 77.4384336013452,
   "start_xy": [
    177403.8356924418,
    21528.580993202657
   ],
   "end_xy": [
    177399.8751388136,
    21525.54739214513
   ]
  },
  "min_10m": {
   "gradient_pct": -16.324668818610917,
   "start_distance_m": 402.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 407.0,
   "start_elevation_m": 78.44882496381183,
   "end_elevation_m": 76.81635808195074,
   "start_xy": [
    177403.8356924418,
    21528.580993202657
   ],
   "end_xy": [
    177395.71370072121,
    21522.775671920583
   ]
  },
  "min_20m": {
   "gradient_pct": -14.047277654500832,
   "start_distance_m": 394.0,
   "end_distance_m": 414.0,
   "midpoint_distance_m": 404.0,
   "start_elevation_m": 79.32794850076114,
   "end_elevation_m": 76.51849296986097,
   "start_xy": [
    177409.84424879443,
    21533.86277799165
   ],
   "end_xy": [
    177394.04912548425,
    21521.66698383076
   ]
  },
  "min_25m": {
   "gradient_pct": -12.997839560028467,
   "start_distance_m": 394.0,
   "end_distance_m": 419.0,
   "midpoint_distance_m": 406.5,
   "start_elevation_m": 79.32794850076114,
   "end_elevation_m": 76.07848861075402,
   "start_xy": [
    177409.84424879443,
    21533.86277799165
   ],
   "end_xy": [
    177389.88768739186,
    21518.895263606213
   ]
  },
  "min_50m": {
   "gradient_pct": -11.726506720241078,
   "start_distance_m": 326.0,
   "end_distance_m": 376.0,
   "midpoint_distance_m": 351.0,
   "start_elevation_m": 85.47768938604892,
   "end_elevation_m": 79.61443602592838,
   "start_xy": [
    177462.52163723257,
    21576.445019110484
   ],
   "end_xy": [
    177423.36350058785,
    21545.74679376688
   ]
  },
  "min_100m": {
   "gradient_pct": -9.9070355860119,
   "start_distance_m": 317.0,
   "end_distance_m": 417.0,
   "midpoint_distance_m": 367.0,
   "start_elevation_m": 86.12178197392733,
   "end_elevation_m": 76.21474638791543,
   "start_xy": [
    177468.54536232687,
    21583.131926915165
   ],
   "end_xy": [
    177391.5522626288,
    21520.003951696035
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.42409381517001,
   "start_distance_m": 86.0,
   "end_distance_m": 88.0,
   "midpoint_distance_m": 87.0,
   "start_elevation_m": 62.236998116990776,
   "end_elevation_m": 63.205479993294176,
   "start_xy": [
    177351.57029891017,
    21739.750083612063
   ],
   "end_xy": [
    177351.72249719602,
    21737.76145933134
   ]
  },
  "max_3m": {
   "gradient_pct": 42.57935782964116,
   "start_distance_m": 86.0,
   "end_distance_m": 89.0,
   "midpoint_distance_m": 87.5,
   "start_elevation_m": 62.236998116990776,
   "end_elevation_m": 63.51437885188001,
   "start_xy": [
    177351.57029891017,
    21739.750083612063
   ],
   "end_xy": [
    177352.00508490304,
    21736.802217866512
   ]
  }
 },
 "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": 0.033,
   "obstruction_max_height_m": 9.39,
   "flagged_windows_m": []
  },
  "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/bulk_dtm_1m/SW7520.tif"
  ],
  "calculated_at": "2026-08-14T23:18:55+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": [
   "SW7520.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.9% over 200 m (Terrain 50), gain 47.6 m over 1031 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 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 (50.0515, -5.1119)'"
 },
 "area": {
  "place": "St Keverne",
  "county": "Cornwall"
 }
}