{
 "ocl_version": "0.1.0",
 "name": "Lane near Penpoll",
 "slug": "discovered-lane-50-3617-4-5993",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.67208517401469,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 102.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 10.8287858335195,
   "end_elevation_m": 11.802227536999794,
   "min_gradient_pct": -20.89365031928274
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 47.58831029735131,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 101.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 10.374578228079255,
   "end_elevation_m": 11.802227536999794,
   "min_gradient_pct": -18.741032409081743
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 44.11076817972187,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 100.0,
   "end_distance_m": 105.0,
   "start_elevation_m": 9.976514690054607,
   "end_elevation_m": 12.1820530990407,
   "min_gradient_pct": -14.667111122528453
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 39.2634292438532,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 100.0,
   "end_distance_m": 110.0,
   "start_elevation_m": 9.976514690054607,
   "end_elevation_m": 13.902857614439927,
   "min_gradient_pct": -14.033195284641238
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.15836173003954,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 89.0,
   "end_distance_m": 109.0,
   "start_elevation_m": 8.138333370689692,
   "end_elevation_m": 13.7700057166976,
   "min_gradient_pct": -14.021671405437601
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.565661255906857,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 84.0,
   "end_distance_m": 109.0,
   "start_elevation_m": 6.878590402720886,
   "end_elevation_m": 13.7700057166976,
   "min_gradient_pct": -13.823878538427891
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.07264956149863,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 86.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 7.247860829532933,
   "end_elevation_m": 18.784185610282247,
   "min_gradient_pct": -13.006989271144548
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.321141201989043,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 312.0,
   "end_distance_m": 412.0,
   "start_elevation_m": 37.581800947979026,
   "end_elevation_m": 55.90294214996807,
   "min_gradient_pct": -9.799016072730907
  }
 ],
 "shape": {
  "ascent_concentration": 0.622,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 130.0,
  "shape_class": "stepped"
 },
 "length_m": 1580.3373373893821,
 "start_elevation_m": 3.234025946378669,
 "end_elevation_m": 81.43607397460946,
 "endpoint_gain_m": 78.20204802823079,
 "overall_gradient_pct": 4.94844019552279,
 "accumulated_ascent_m": 94.80938835094554,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 44.11076817972187,
   "start_distance_m": 100.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 102.5,
   "start_elevation_m": 9.976514690054607,
   "end_elevation_m": 12.1820530990407,
   "start_xy": [
    214785.7587888442,
    54503.27256814597
   ],
   "end_xy": [
    214788.8407246758,
    54499.374100023946
   ]
  },
  "max_10m": {
   "gradient_pct": 39.2634292438532,
   "start_distance_m": 100.0,
   "end_distance_m": 110.0,
   "midpoint_distance_m": 105.0,
   "start_elevation_m": 9.976514690054607,
   "end_elevation_m": 13.902857614439927,
   "start_xy": [
    214785.7587888442,
    54503.27256814597
   ],
   "end_xy": [
    214791.7424679176,
    54495.302260543256
   ]
  },
  "max_20m": {
   "gradient_pct": 28.15836173003954,
   "start_distance_m": 89.0,
   "end_distance_m": 109.0,
   "midpoint_distance_m": 99.0,
   "start_elevation_m": 8.138333370689692,
   "end_elevation_m": 13.7700057166976,
   "start_xy": [
    214775.16364092522,
    54506.20539149818
   ],
   "end_xy": [
    214791.16160774522,
    54496.11626384749
   ]
  },
  "max_25m": {
   "gradient_pct": 27.565661255906857,
   "start_distance_m": 84.0,
   "end_distance_m": 109.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 6.878590402720886,
   "end_elevation_m": 13.7700057166976,
   "start_xy": [
    214770.34106436998,
    54507.525525940175
   ],
   "end_xy": [
    214791.16160774522,
    54496.11626384749
   ]
  },
  "max_50m": {
   "gradient_pct": 23.07264956149863,
   "start_distance_m": 86.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 111.0,
   "start_elevation_m": 7.247860829532933,
   "end_elevation_m": 18.784185610282247,
   "start_xy": [
    214772.2701065499,
    54506.99751438882
   ],
   "end_xy": [
    214806.82958044918,
    54474.12730209013
   ]
  },
  "max_100m": {
   "gradient_pct": 18.321141201989043,
   "start_distance_m": 312.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 362.0,
   "start_elevation_m": 37.581800947979026,
   "end_elevation_m": 55.90294214996807,
   "start_xy": [
    214966.53604269327,
    54463.18186722083
   ],
   "end_xy": [
    215058.31648574286,
    54474.49620855838
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -14.667111122528453,
   "start_distance_m": 193.0,
   "end_distance_m": 198.0,
   "midpoint_distance_m": 195.5,
   "start_elevation_m": 24.48803336254072,
   "end_elevation_m": 23.754677806414296,
   "start_xy": [
    214853.75665946654,
    54442.56627978198
   ],
   "end_xy": [
    214858.69304243405,
    54441.77121808813
   ]
  },
  "min_10m": {
   "gradient_pct": -14.033195284641238,
   "start_distance_m": 1027.0,
   "end_distance_m": 1037.0,
   "midpoint_distance_m": 1032.0,
   "start_elevation_m": 65.92893655218171,
   "end_elevation_m": 64.52561702371759,
   "start_xy": [
    215613.00549124027,
    54411.44230730213
   ],
   "end_xy": [
    215622.9373899164,
    54412.502309220166
   ]
  },
  "min_20m": {
   "gradient_pct": -14.021671405437601,
   "start_distance_m": 1027.0,
   "end_distance_m": 1047.0,
   "midpoint_distance_m": 1037.0,
   "start_elevation_m": 65.92893655218171,
   "end_elevation_m": 63.12460227109419,
   "start_xy": [
    215613.00549124027,
    54411.44230730213
   ],
   "end_xy": [
    215632.93734741656,
    54412.47330930517
   ]
  },
  "min_25m": {
   "gradient_pct": -13.823878538427891,
   "start_distance_m": 1022.0,
   "end_distance_m": 1047.0,
   "midpoint_distance_m": 1034.5,
   "start_elevation_m": 66.58057190570116,
   "end_elevation_m": 63.12460227109419,
   "start_xy": [
    215608.0488945701,
    54410.78493056376
   ],
   "end_xy": [
    215632.93734741656,
    54412.47330930517
   ]
  },
  "min_50m": {
   "gradient_pct": -13.006989271144548,
   "start_distance_m": 1006.0,
   "end_distance_m": 1056.0,
   "midpoint_distance_m": 1031.0,
   "start_elevation_m": 68.56532553788449,
   "end_elevation_m": 62.06183090231222,
   "start_xy": [
    215592.18320866002,
    54408.7288779686
   ],
   "end_xy": [
    215641.93730855346,
    54412.44696407434
   ]
  },
  "min_100m": {
   "gradient_pct": -9.799016072730907,
   "start_distance_m": 980.0,
   "end_distance_m": 1080.0,
   "midpoint_distance_m": 1030.0,
   "start_elevation_m": 70.29060935611005,
   "end_elevation_m": 60.491593283379146,
   "start_xy": [
    215568.9539730923,
    54418.70649819181
   ],
   "end_xy": [
    215663.94470027488,
    54405.638054054274
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.67208517401469,
   "start_distance_m": 102.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 103.0,
   "start_elevation_m": 10.8287858335195,
   "end_elevation_m": 11.802227536999794,
   "start_xy": [
    214787.09966008645,
    54501.81719051569
   ],
   "end_xy": [
    214788.26033888638,
    54500.18844163191
   ]
  },
  "max_3m": {
   "gradient_pct": 47.58831029735131,
   "start_distance_m": 101.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 102.5,
   "start_elevation_m": 10.374578228079255,
   "end_elevation_m": 11.802227536999794,
   "start_xy": [
    214786.5196796801,
    54502.63182079436
   ],
   "end_xy": [
    214788.26033888638,
    54500.18844163191
   ]
  }
 },
 "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": 0.03,
   "obstruction_max_height_m": 9.31,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50
   ]
  },
  "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/SX1050.tif",
   "data/cache/england/bulk_dtm_1m/SX1550.tif"
  ],
  "calculated_at": "2026-08-19T18:09:33+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": [
   "SX1050.tif",
   "SX1550.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.4% over 200 m (Terrain 50), gain 61.7 m over 1151 m way. EXTENDED by graph walk: +1 segment(s) at base, +1 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): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (50.3617, -4.5993)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.3617, -4.5993)'"
 },
 "area": {
  "place": "Penpoll",
  "county": "Cornwall"
 }
}