{
 "ocl_version": "0.1.0",
 "name": "Trewidland to Duloe",
 "slug": "discovered-lane-50-4050-4-4767",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.78238957669235,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 306.0,
   "end_distance_m": 308.0,
   "start_elevation_m": 58.67036923181666,
   "end_elevation_m": 59.386017023350504,
   "min_gradient_pct": -16.435240904853288
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 30.178501174309957,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 305.0,
   "end_distance_m": 308.0,
   "start_elevation_m": 58.480661988121206,
   "end_elevation_m": 59.386017023350504,
   "min_gradient_pct": -15.996999451198235
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.35042572319003,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 261.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 49.74923792800858,
   "end_elevation_m": 51.116759214168084,
   "min_gradient_pct": -14.076454695943141
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.010459519611317,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 256.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 48.61571326220695,
   "end_elevation_m": 51.116759214168084,
   "min_gradient_pct": -10.15713948171964
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.076486429583447,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 246.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 46.501461928251395,
   "end_elevation_m": 51.116759214168084,
   "min_gradient_pct": -6.536709718461395
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.408597858775494,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 245.0,
   "end_distance_m": 270.0,
   "start_elevation_m": 46.29075125540711,
   "end_elevation_m": 51.89290072010098,
   "min_gradient_pct": -5.426585304275818
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.548201806268654,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 216.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 40.34265831103376,
   "end_elevation_m": 51.116759214168084,
   "min_gradient_pct": -4.962256485393283
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.518957745062327,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 209.0,
   "end_distance_m": 309.0,
   "start_elevation_m": 39.039151607659676,
   "end_elevation_m": 59.558109352722,
   "min_gradient_pct": -3.4604336675482017
  }
 ],
 "shape": {
  "ascent_concentration": 0.549,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 350.0,
  "shape_class": "stepped"
 },
 "length_m": 1596.2553904703034,
 "start_elevation_m": 13.30258803939832,
 "end_elevation_m": 126.46734607412785,
 "endpoint_gain_m": 113.16475803472953,
 "overall_gradient_pct": 7.089389248758489,
 "accumulated_ascent_m": 119.44690462637924,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.35042572319003,
   "start_distance_m": 261.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 263.5,
   "start_elevation_m": 49.74923792800858,
   "end_elevation_m": 51.116759214168084,
   "start_xy": [
    224594.35421394312,
    58977.302459359875
   ],
   "end_xy": [
    224589.39231471563,
    58977.91853805637
   ]
  },
  "max_10m": {
   "gradient_pct": 25.010459519611317,
   "start_distance_m": 256.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 261.0,
   "start_elevation_m": 48.61571326220695,
   "end_elevation_m": 51.116759214168084,
   "start_xy": [
    224599.3161243009,
    58976.68647047479
   ],
   "end_xy": [
    224589.39231471563,
    58977.91853805637
   ]
  },
  "max_20m": {
   "gradient_pct": 23.076486429583447,
   "start_distance_m": 246.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 256.0,
   "start_elevation_m": 46.501461928251395,
   "end_elevation_m": 51.116759214168084,
   "start_xy": [
    224609.04997208028,
    58974.452864648694
   ],
   "end_xy": [
    224589.39231471563,
    58977.91853805637
   ]
  },
  "max_25m": {
   "gradient_pct": 22.408597858775494,
   "start_distance_m": 245.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 257.5,
   "start_elevation_m": 46.29075125540711,
   "end_elevation_m": 51.89290072010098,
   "start_xy": [
    224610.01802387138,
    58974.20211467797
   ],
   "end_xy": [
    224585.4228089973,
    58978.411509569894
   ]
  },
  "max_50m": {
   "gradient_pct": 21.548201806268654,
   "start_distance_m": 216.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 241.0,
   "start_elevation_m": 40.34265831103376,
   "end_elevation_m": 51.116759214168084,
   "start_xy": [
    224638.2629813079,
    58967.66720155487
   ],
   "end_xy": [
    224589.39231471563,
    58977.91853805637
   ]
  },
  "max_100m": {
   "gradient_pct": 20.518957745062327,
   "start_distance_m": 209.0,
   "end_distance_m": 309.0,
   "midpoint_distance_m": 259.0,
   "start_elevation_m": 39.039151607659676,
   "end_elevation_m": 59.558109352722,
   "start_xy": [
    224645.1764941696,
    58966.570237262524
   ],
   "end_xy": [
    224546.6534817701,
    58982.618189896464
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -14.076454695943141,
   "start_distance_m": 591.0,
   "end_distance_m": 596.0,
   "midpoint_distance_m": 593.5,
   "start_elevation_m": 89.78132749770809,
   "end_elevation_m": 89.07750476291093,
   "start_xy": [
    224277.7761064339,
    59040.76668169491
   ],
   "end_xy": [
    224273.09277819464,
    59042.51780430296
   ]
  },
  "min_10m": {
   "gradient_pct": -10.15713948171964,
   "start_distance_m": 590.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 595.0,
   "start_elevation_m": 89.91821907217113,
   "end_elevation_m": 88.90250512399916,
   "start_xy": [
    224278.71288678466,
    59040.41676374106
   ],
   "end_xy": [
    224269.31370916605,
    59043.82022290475
   ]
  },
  "min_20m": {
   "gradient_pct": -6.536709718461395,
   "start_distance_m": 590.0,
   "end_distance_m": 610.0,
   "midpoint_distance_m": 600.0,
   "start_elevation_m": 89.91821907217113,
   "end_elevation_m": 88.61087712847885,
   "start_xy": [
    224278.71288678466,
    59040.41676374106
   ],
   "end_xy": [
    224259.653355568,
    59046.404317710025
   ]
  },
  "min_25m": {
   "gradient_pct": -5.426585304275818,
   "start_distance_m": 590.0,
   "end_distance_m": 615.0,
   "midpoint_distance_m": 602.5,
   "start_elevation_m": 89.91821907217113,
   "end_elevation_m": 88.56157274610217,
   "start_xy": [
    224278.71288678466,
    59040.41676374106
   ],
   "end_xy": [
    224254.82335488027,
    59047.697023230736
   ]
  },
  "min_50m": {
   "gradient_pct": -4.962256485393283,
   "start_distance_m": 1537.0,
   "end_distance_m": 1587.0,
   "midpoint_distance_m": 1562.0,
   "start_elevation_m": 129.1734047459834,
   "end_elevation_m": 126.69227650328675,
   "start_xy": [
    223361.1152680039,
    58929.40857217203
   ],
   "end_xy": [
    223318.4697573356,
    58903.322220057635
   ]
  },
  "min_100m": {
   "gradient_pct": -3.4604336675482017,
   "start_distance_m": 1496.0,
   "end_distance_m": 1596.0,
   "midpoint_distance_m": 1546.0,
   "start_elevation_m": 129.94120520410135,
   "end_elevation_m": 126.48077153655315,
   "start_xy": [
    223394.9429569693,
    58952.54638041985
   ],
   "end_xy": [
    223310.5945821556,
    58898.96543140613
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.78238957669235,
   "start_distance_m": 306.0,
   "end_distance_m": 308.0,
   "midpoint_distance_m": 307.0,
   "start_elevation_m": 58.67036923181666,
   "end_elevation_m": 59.386017023350504,
   "start_xy": [
    224549.6261764242,
    58982.21455357631
   ],
   "end_xy": [
    224547.64405590715,
    58982.48121225098
   ]
  },
  "max_3m": {
   "gradient_pct": 30.178501174309957,
   "start_distance_m": 305.0,
   "end_distance_m": 308.0,
   "midpoint_distance_m": 306.5,
   "start_elevation_m": 58.480661988121206,
   "end_elevation_m": 59.386017023350504,
   "start_xy": [
    224550.6203458477,
    58982.10739740224
   ],
   "end_xy": [
    224547.64405590715,
    58982.48121225098
   ]
  }
 },
 "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": 0.005,
   "obstruction_max_height_m": 3.28,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "descends_at_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/SX2055.tif"
  ],
  "calculated_at": "2026-08-19T18:11:05+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": [
   "SX2055.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.2% over 200 m (Terrain 50), gain 104.5 m over 1491 m way. EXTENDED by graph walk: +2 segment(s) at base, +0 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 (50.4050, -4.4767)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4050, -4.4767)'"
 },
 "area": {
  "place": "Trewidland",
  "county": "Cornwall"
 }
}