{
 "ocl_version": "0.1.0",
 "name": "Chivelstone to South Pool",
 "slug": "discovered-lane-50-2405-3-7184",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 40.959885840975474,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 263.0,
   "end_distance_m": 265.0,
   "start_elevation_m": 49.630738276551824,
   "end_elevation_m": 50.449935993371334,
   "min_gradient_pct": -37.007991798929396,
   "suppressed_max_gradient_pct": 76.98959248581829,
   "suppressed_location_m": [
    372.0,
    374.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 38.23772475372257,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 263.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 49.630738276551824,
   "end_elevation_m": 50.7778700191635,
   "min_gradient_pct": -31.439706531580924,
   "suppressed_max_gradient_pct": 62.881006388914784,
   "suppressed_location_m": [
    372.0,
    375.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.97065167478945,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 409.0,
   "end_distance_m": 414.0,
   "start_elevation_m": 68.87766217696469,
   "end_elevation_m": 70.67619476070416,
   "min_gradient_pct": -23.824368545595576,
   "suppressed_max_gradient_pct": 44.55648901342272,
   "suppressed_location_m": [
    372.0,
    377.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.193857190061976,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 308.0,
   "end_distance_m": 318.0,
   "start_elevation_m": 55.53727483528987,
   "end_elevation_m": 58.25666055429607,
   "min_gradient_pct": -7.156206723322782,
   "suppressed_max_gradient_pct": 30.195354646331158,
   "suppressed_location_m": [
    264.0,
    274.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.996702461179233,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 302.0,
   "end_distance_m": 322.0,
   "start_elevation_m": 54.57974617910169,
   "end_elevation_m": 59.17908667133754,
   "min_gradient_pct": -4.313460748880615,
   "suppressed_max_gradient_pct": 26.20434427754475,
   "suppressed_location_m": [
    255.0,
    275.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.290419928225404,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 25.598281477510934,
   "end_elevation_m": 30.920886459567285,
   "min_gradient_pct": -3.300566139341413,
   "suppressed_max_gradient_pct": 24.784011934056167,
   "suppressed_location_m": [
    250.0,
    275.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.887453260856176,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 216.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 40.33414338873541,
   "end_elevation_m": 50.7778700191635,
   "min_gradient_pct": -2.622929593889637,
   "suppressed_max_gradient_pct": 22.38406688978742,
   "suppressed_location_m": [
    225.0,
    275.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.603071141154416,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 166.0,
   "end_distance_m": 266.0,
   "start_elevation_m": 32.174798878009085,
   "end_elevation_m": 50.7778700191635,
   "min_gradient_pct": 0.4677049818297121,
   "suppressed_max_gradient_pct": 19.95166611147694,
   "suppressed_location_m": [
    175.0,
    275.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.406,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 184.0,
  "shape_class": "sustained"
 },
 "length_m": 591.5081459750161,
 "start_elevation_m": 12.026877812910296,
 "end_elevation_m": 77.10673072271928,
 "endpoint_gain_m": 65.07985290980898,
 "overall_gradient_pct": 11.002359536830081,
 "accumulated_ascent_m": 70.64188754680191,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.97065167478945,
   "start_distance_m": 409.0,
   "end_distance_m": 414.0,
   "midpoint_distance_m": 411.5,
   "start_elevation_m": 68.87766217696469,
   "end_elevation_m": 70.67619476070416,
   "start_xy": [
    277543.71539761726,
    39272.68581789651
   ],
   "end_xy": [
    277540.3707120148,
    39276.40241251568
   ]
  },
  "max_10m": {
   "gradient_pct": 27.193857190061976,
   "start_distance_m": 308.0,
   "end_distance_m": 318.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 55.53727483528987,
   "end_elevation_m": 58.25666055429607,
   "start_xy": [
    277592.4625461378,
    39184.621356549
   ],
   "end_xy": [
    277588.62618742656,
    39193.856178647824
   ]
  },
  "max_20m": {
   "gradient_pct": 22.996702461179233,
   "start_distance_m": 302.0,
   "end_distance_m": 322.0,
   "midpoint_distance_m": 312.0,
   "start_elevation_m": 54.57974617910169,
   "end_elevation_m": 59.17908667133754,
   "start_xy": [
    277594.76248372823,
    39179.07967111004
   ],
   "end_xy": [
    277586.8253188726,
    39197.42640276222
   ]
  },
  "max_25m": {
   "gradient_pct": 21.290419928225404,
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 145.5,
   "start_elevation_m": 25.598281477510934,
   "end_elevation_m": 30.920886459567285,
   "start_xy": [
    277601.9262800237,
    39012.3213458599
   ],
   "end_xy": [
    277604.4882200806,
    39037.189725826596
   ]
  },
  "max_50m": {
   "gradient_pct": 20.887453260856176,
   "start_distance_m": 216.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 241.0,
   "start_elevation_m": 40.33414338873541,
   "end_elevation_m": 50.7778700191635,
   "start_xy": [
    277608.2275371336,
    39094.98607876167
   ],
   "end_xy": [
    277604.49611753726,
    39144.82449230724
   ]
  },
  "max_100m": {
   "gradient_pct": 18.603071141154416,
   "start_distance_m": 166.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 216.0,
   "start_elevation_m": 32.174798878009085,
   "end_elevation_m": 50.7778700191635,
   "start_xy": [
    277605.3081656196,
    39045.14759437132
   ],
   "end_xy": [
    277604.49611753726,
    39144.82449230724
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -23.824368545595576,
   "start_distance_m": 365.0,
   "end_distance_m": 370.0,
   "midpoint_distance_m": 367.5,
   "start_elevation_m": 63.76402793215026,
   "end_elevation_m": 62.572809504870484,
   "start_xy": [
    277566.7582810477,
    39235.455617069194
   ],
   "end_xy": [
    277564.3715584622,
    39239.8491972992
   ]
  },
  "min_10m": {
   "gradient_pct": -7.156206723322782,
   "start_distance_m": 362.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 367.0,
   "start_elevation_m": 63.40557074896812,
   "end_elevation_m": 62.68995007663584,
   "start_xy": [
    277568.1903510242,
    39232.81948838844
   ],
   "end_xy": [
    277563.4175811769,
    39241.60701616454
   ]
  },
  "min_20m": {
   "gradient_pct": -4.313460748880615,
   "start_distance_m": 571.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 581.0,
   "start_elevation_m": 77.9945731907901,
   "end_elevation_m": 77.13188104101398,
   "start_xy": [
    277456.31787087326,
    39408.52128391443
   ],
   "end_xy": [
    277449.68062709755,
    39427.27783310335
   ]
  },
  "min_25m": {
   "gradient_pct": -3.300566139341413,
   "start_distance_m": 566.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 578.5,
   "start_elevation_m": 77.95702257584934,
   "end_elevation_m": 77.13188104101398,
   "start_xy": [
    277458.67011650815,
    39404.11052295209
   ],
   "end_xy": [
    277449.68062709755,
    39427.27783310335
   ]
  },
  "min_50m": {
   "gradient_pct": -2.622929593889637,
   "start_distance_m": 541.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 566.0,
   "start_elevation_m": 78.4433458379588,
   "end_elevation_m": 77.13188104101398,
   "start_xy": [
    277470.86528869526,
    39382.30105964316
   ],
   "end_xy": [
    277449.68062709755,
    39427.27783310335
   ]
  },
  "min_100m": {
   "gradient_pct": 0.4677049818297121,
   "start_distance_m": 491.0,
   "end_distance_m": 591.0,
   "midpoint_distance_m": 541.0,
   "start_elevation_m": 76.66417605918427,
   "end_elevation_m": 77.13188104101398,
   "start_xy": [
    277497.9129216083,
    39340.24842975533
   ],
   "end_xy": [
    277449.68062709755,
    39427.27783310335
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 40.959885840975474,
   "start_distance_m": 263.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 264.0,
   "start_elevation_m": 49.630738276551824,
   "end_elevation_m": 50.449935993371334,
   "start_xy": [
    277604.76312208094,
    39141.83639783541
   ],
   "end_xy": [
    277604.58511647367,
    39143.828460586374
   ]
  },
  "max_3m": {
   "gradient_pct": 38.23772475372257,
   "start_distance_m": 263.0,
   "end_distance_m": 266.0,
   "midpoint_distance_m": 264.5,
   "start_elevation_m": 49.630738276551824,
   "end_elevation_m": 50.7778700191635,
   "start_xy": [
    277604.76312208094,
    39141.83639783541
   ],
   "end_xy": [
    277604.49611753726,
    39144.82449230724
   ]
  }
 },
 "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": 0.126,
   "obstruction_max_height_m": 6.31,
   "flagged_windows_m": [
    50
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.022,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    271.0,
    276.0
   ],
   [
    370.0,
    376.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "may_start_earlier",
   "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/SX7535.tif"
  ],
  "calculated_at": "2026-08-19T18:07:35+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": [
   "SX7535.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.8% over 200 m (Terrain 50), gain 55.7 m over 491 m way. EXTENDED by graph walk: +1 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 (50.2405, -3.7184)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.2405, -3.7184)'"
 },
 "area": {
  "place": "South Pool",
  "county": "Devon"
 }
}