{
 "ocl_version": "0.1.0",
 "name": "Hobb's Hill to Crumplehorn",
 "slug": "discovered-lane-50-3454-4-5282",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.89361113019106,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 412.0,
   "end_distance_m": 414.0,
   "start_elevation_m": 107.15200073213556,
   "end_elevation_m": 108.12987295473938,
   "min_gradient_pct": -18.374965332004578
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 47.04690590660997,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "start_elevation_m": 66.95511429453343,
   "end_elevation_m": 68.36652147173173,
   "min_gradient_pct": -16.46554581901943
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 44.218337005108026,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 126.0,
   "start_elevation_m": 66.59892379520235,
   "end_elevation_m": 68.80984064545775,
   "min_gradient_pct": -9.878690884171988
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 35.094309249421656,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 117.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 65.55972688010371,
   "end_elevation_m": 69.06915780504588,
   "min_gradient_pct": -6.344820187903153
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.991190205342047,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 107.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 63.670919763977466,
   "end_elevation_m": 69.06915780504588,
   "min_gradient_pct": -2.622049661731367
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.50383953084184,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 102.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 62.443197922335415,
   "end_elevation_m": 69.06915780504588,
   "min_gradient_pct": 0.1565172574880762
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.41447793658405,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 40.0,
   "end_distance_m": 90.0,
   "start_elevation_m": 50.43734798680318,
   "end_elevation_m": 61.64458695509521,
   "min_gradient_pct": 0.5529886033190792
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.027346889762832,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 49.673457956742304,
   "end_elevation_m": 69.70080484650514,
   "min_gradient_pct": 0.882915728250083
  }
 ],
 "shape": {
  "ascent_concentration": 0.41,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 120.0,
  "shape_class": "sustained"
 },
 "length_m": 837.6505670522481,
 "start_elevation_m": 49.49406531231263,
 "end_elevation_m": 131.22306130990626,
 "endpoint_gain_m": 81.72899599759363,
 "overall_gradient_pct": 9.756931972863551,
 "accumulated_ascent_m": 87.16348589465329,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 44.218337005108026,
   "start_distance_m": 121.0,
   "end_distance_m": 126.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 66.59892379520235,
   "end_elevation_m": 68.80984064545775,
   "start_xy": [
    220497.87958927633,
    52631.77967594342
   ],
   "end_xy": [
    220492.92074151573,
    52632.4198547367
   ]
  },
  "max_10m": {
   "gradient_pct": 35.094309249421656,
   "start_distance_m": 117.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 65.55972688010371,
   "end_elevation_m": 69.06915780504588,
   "start_xy": [
    220501.8466674848,
    52631.267532908794
   ],
   "end_xy": [
    220491.9289719636,
    52632.547890495356
   ]
  },
  "max_20m": {
   "gradient_pct": 26.991190205342047,
   "start_distance_m": 107.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 117.0,
   "start_elevation_m": 63.670919763977466,
   "end_elevation_m": 69.06915780504588,
   "start_xy": [
    220511.76436300596,
    52629.98717532224
   ],
   "end_xy": [
    220491.9289719636,
    52632.547890495356
   ]
  },
  "max_25m": {
   "gradient_pct": 26.50383953084184,
   "start_distance_m": 102.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 114.5,
   "start_elevation_m": 62.443197922335415,
   "end_elevation_m": 69.06915780504588,
   "start_xy": [
    220516.72321076653,
    52629.346996528955
   ],
   "end_xy": [
    220491.9289719636,
    52632.547890495356
   ]
  },
  "max_50m": {
   "gradient_pct": 22.41447793658405,
   "start_distance_m": 40.0,
   "end_distance_m": 90.0,
   "midpoint_distance_m": 65.0,
   "start_elevation_m": 50.43734798680318,
   "end_elevation_m": 61.64458695509521,
   "start_xy": [
    220577.60413848658,
    52622.03596921665
   ],
   "end_xy": [
    220528.62444539194,
    52627.810567425084
   ]
  },
  "max_100m": {
   "gradient_pct": 20.027346889762832,
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 49.673457956742304,
   "end_elevation_m": 69.70080484650514,
   "start_xy": [
    220584.65715276703,
    52618.26039117352
   ],
   "end_xy": [
    220486.97012420304,
    52633.18806928863
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.878690884171988,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 49.49406531231263,
   "end_elevation_m": 49.00013076810403,
   "start_xy": [
    220615.443,
    52611.119
   ],
   "end_xy": [
    220610.48775238072,
    52611.78647361866
   ]
  },
  "min_10m": {
   "gradient_pct": -6.344820187903153,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 49.49406531231263,
   "end_elevation_m": 48.85958329352231,
   "start_xy": [
    220615.443,
    52611.119
   ],
   "end_xy": [
    220605.53250476145,
    52612.453947237314
   ]
  },
  "min_20m": {
   "gradient_pct": -2.622049661731367,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 49.49406531231263,
   "end_elevation_m": 48.969655379966355,
   "start_xy": [
    220615.443,
    52611.119
   ],
   "end_xy": [
    220595.62200952286,
    52613.78889447463
   ]
  },
  "min_25m": {
   "gradient_pct": 0.1565172574880762,
   "start_distance_m": 760.0,
   "end_distance_m": 785.0,
   "midpoint_distance_m": 772.5,
   "start_elevation_m": 130.80549002102413,
   "end_elevation_m": 130.84461933539615,
   "start_xy": [
    219897.08895536658,
    52623.351620342306
   ],
   "end_xy": [
    219875.2378736736,
    52635.49782258199
   ]
  },
  "min_50m": {
   "gradient_pct": 0.5529886033190792,
   "start_distance_m": 774.0,
   "end_distance_m": 824.0,
   "midpoint_distance_m": 799.0,
   "start_elevation_m": 130.80317403379232,
   "end_elevation_m": 131.07966833545186,
   "start_xy": [
    219884.8523496185,
    52630.153493596525
   ],
   "end_xy": [
    219841.15018623258,
    52654.445898075886
   ]
  },
  "min_100m": {
   "gradient_pct": 0.882915728250083,
   "start_distance_m": 733.0,
   "end_distance_m": 833.0,
   "midpoint_distance_m": 783.0,
   "start_elevation_m": 130.30060959992642,
   "end_elevation_m": 131.1835253281765,
   "start_xy": [
    219920.68812359497,
    52610.233721923454
   ],
   "end_xy": [
    219833.28379682312,
    52658.81853088217
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.89361113019106,
   "start_distance_m": 412.0,
   "end_distance_m": 414.0,
   "midpoint_distance_m": 413.0,
   "start_elevation_m": 107.15200073213556,
   "end_elevation_m": 108.12987295473938,
   "start_xy": [
    220230.24620316437,
    52550.82587500231
   ],
   "end_xy": [
    220228.2924098113,
    52551.253299303906
   ]
  },
  "max_3m": {
   "gradient_pct": 47.04690590660997,
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 66.95511429453343,
   "end_elevation_m": 68.36652147173173,
   "start_xy": [
    220496.88781972422,
    52631.90771170208
   ],
   "end_xy": [
    220493.91251106784,
    52632.29181897805
   ]
  }
 },
 "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": 0.042,
   "obstruction_max_height_m": 15.87,
   "flagged_windows_m": [
    50,
    100
   ]
  },
  "review": [
   "short_window_divergence"
  ],
  "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/SX1550.tif",
   "data/cache/england/bulk_dtm_1m/SX2050.tif"
  ],
  "calculated_at": "2026-08-15T00:06:33+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-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": [
   "SX1550.tif",
   "SX2050.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.9% over 200 m (Terrain 50), gain 63.0 m over 537 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.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.3454, -4.5282)'"
 },
 "area": {
  "place": "Carey Park",
  "county": "Cornwall"
 }
}