{
 "ocl_version": "0.1.0",
 "name": "Cheney Longville to Round Oak",
 "slug": "discovered-lane-52-4646-2-8773",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 38.16566616628023,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 74.0,
   "end_distance_m": 76.0,
   "start_elevation_m": 150.7157149524751,
   "end_elevation_m": 151.47902827580072,
   "min_gradient_pct": -14.90999553269603
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.185370854296174,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 74.0,
   "end_distance_m": 77.0,
   "start_elevation_m": 150.7157149524751,
   "end_elevation_m": 151.801276078104,
   "min_gradient_pct": -14.16362507568465
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.787533305875854,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 73.0,
   "end_distance_m": 78.0,
   "start_elevation_m": 150.4464056732899,
   "end_elevation_m": 152.13578233858368,
   "min_gradient_pct": -13.54719406417189
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.54839009866657,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1635.0,
   "end_distance_m": 1645.0,
   "start_elevation_m": 243.89682189390797,
   "end_elevation_m": 247.15166090377463,
   "min_gradient_pct": -12.46965474083538
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.770755770553848,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1627.0,
   "end_distance_m": 1647.0,
   "start_elevation_m": 242.08568739049045,
   "end_elevation_m": 247.63983854460122,
   "min_gradient_pct": -11.50826754862436
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.310904738408,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1620.0,
   "end_distance_m": 1645.0,
   "start_elevation_m": 240.32393471917263,
   "end_elevation_m": 247.15166090377463,
   "min_gradient_pct": -10.576106368352612
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.361986787966657,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1600.0,
   "end_distance_m": 1650.0,
   "start_elevation_m": 236.54596861624316,
   "end_elevation_m": 248.2269620102265,
   "min_gradient_pct": -9.492169662586093
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.53832456289257,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1567.0,
   "end_distance_m": 1667.0,
   "start_elevation_m": 233.04453108037745,
   "end_elevation_m": 249.58285564327002,
   "min_gradient_pct": -8.802031777859838
  }
 ],
 "shape": {
  "ascent_concentration": 0.403,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 125.0,
  "shape_class": "sustained"
 },
 "length_m": 3135.4753733124494,
 "start_elevation_m": 142.23441478280733,
 "end_elevation_m": 267.0658398933108,
 "endpoint_gain_m": 124.83142511050346,
 "overall_gradient_pct": 3.981259944600561,
 "accumulated_ascent_m": 159.63178820703305,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.787533305875854,
   "start_distance_m": 73.0,
   "end_distance_m": 78.0,
   "midpoint_distance_m": 75.5,
   "start_elevation_m": 150.4464056732899,
   "end_elevation_m": 152.13578233858368,
   "start_xy": [
    341889.57581034227,
    284941.9354819316
   ],
   "end_xy": [
    341887.002068926,
    284946.20244471834
   ]
  },
  "max_10m": {
   "gradient_pct": 32.54839009866657,
   "start_distance_m": 1635.0,
   "end_distance_m": 1645.0,
   "midpoint_distance_m": 1640.0,
   "start_elevation_m": 243.89682189390797,
   "end_elevation_m": 247.15166090377463,
   "start_xy": [
    340613.7037057689,
    285474.9414950888
   ],
   "end_xy": [
    340604.2138854055,
    285477.56710198586
   ]
  },
  "max_20m": {
   "gradient_pct": 27.770755770553848,
   "start_distance_m": 1627.0,
   "end_distance_m": 1647.0,
   "midpoint_distance_m": 1637.0,
   "start_elevation_m": 242.08568739049045,
   "end_elevation_m": 247.63983854460122,
   "start_xy": [
    340621.6370477932,
    285473.91092033393
   ],
   "end_xy": [
    340602.4480189763,
    285478.5060991926
   ]
  },
  "max_25m": {
   "gradient_pct": 27.310904738408,
   "start_distance_m": 1620.0,
   "end_distance_m": 1645.0,
   "midpoint_distance_m": 1632.5,
   "start_elevation_m": 240.32393471917263,
   "end_elevation_m": 247.15166090377463,
   "start_xy": [
    340628.5787220645,
    285473.0091674235
   ],
   "end_xy": [
    340604.2138854055,
    285477.56710198586
   ]
  },
  "max_50m": {
   "gradient_pct": 23.361986787966657,
   "start_distance_m": 1600.0,
   "end_distance_m": 1650.0,
   "midpoint_distance_m": 1625.0,
   "start_elevation_m": 236.54596861624316,
   "end_elevation_m": 248.2269620102265,
   "start_xy": [
    340648.33833360876,
    285475.0902309859
   ],
   "end_xy": [
    340599.7992193325,
    285479.91459500266
   ]
  },
  "max_100m": {
   "gradient_pct": 16.53832456289257,
   "start_distance_m": 1567.0,
   "end_distance_m": 1667.0,
   "midpoint_distance_m": 1617.0,
   "start_elevation_m": 233.04453108037745,
   "end_elevation_m": 249.58285564327002,
   "start_xy": [
    340678.4434460739,
    285487.1891490867
   ],
   "end_xy": [
    340584.78935468436,
    285487.89607125986
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.54719406417189,
   "start_distance_m": 2100.0,
   "end_distance_m": 2105.0,
   "midpoint_distance_m": 2102.5,
   "start_elevation_m": 266.73228874172514,
   "end_elevation_m": 266.05492903851655,
   "start_xy": [
    340251.92049230495,
    285367.2290301978
   ],
   "end_xy": [
    340246.92936010635,
    285366.93137372413
   ]
  },
  "min_10m": {
   "gradient_pct": -12.46965474083538,
   "start_distance_m": 2095.0,
   "end_distance_m": 2105.0,
   "midpoint_distance_m": 2100.0,
   "start_elevation_m": 267.3018945126001,
   "end_elevation_m": 266.05492903851655,
   "start_xy": [
    340256.9116245035,
    285367.5266866715
   ],
   "end_xy": [
    340246.92936010635,
    285366.93137372413
   ]
  },
  "min_20m": {
   "gradient_pct": -11.50826754862436,
   "start_distance_m": 2089.0,
   "end_distance_m": 2109.0,
   "midpoint_distance_m": 2099.0,
   "start_elevation_m": 268.0359532051372,
   "end_elevation_m": 265.73429969541235,
   "start_xy": [
    340262.9009831418,
    285367.8838744399
   ],
   "end_xy": [
    340242.9364543475,
    285366.69324854517
   ]
  },
  "min_25m": {
   "gradient_pct": -10.576106368352612,
   "start_distance_m": 2089.0,
   "end_distance_m": 2114.0,
   "midpoint_distance_m": 2101.5,
   "start_elevation_m": 268.0359532051372,
   "end_elevation_m": 265.39192661304907,
   "start_xy": [
    340262.9009831418,
    285367.8838744399
   ],
   "end_xy": [
    340237.9730873012,
    285366.1474295418
   ]
  },
  "min_50m": {
   "gradient_pct": -9.492169662586093,
   "start_distance_m": 2053.0,
   "end_distance_m": 2103.0,
   "midpoint_distance_m": 2078.0,
   "start_elevation_m": 271.076657237206,
   "end_elevation_m": 266.33057240591296,
   "start_xy": [
    340298.8374727505,
    285370.02132932417
   ],
   "end_xy": [
    340248.9258129858,
    285367.0504363136
   ]
  },
  "min_100m": {
   "gradient_pct": -8.802031777859838,
   "start_distance_m": 2037.0,
   "end_distance_m": 2137.0,
   "midpoint_distance_m": 2087.0,
   "start_elevation_m": 272.5865949121321,
   "end_elevation_m": 263.7845631342723,
   "start_xy": [
    340314.8092515896,
    285370.97121390403
   ],
   "end_xy": [
    340215.2690633051,
    285362.47077263595
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 38.16566616628023,
   "start_distance_m": 74.0,
   "end_distance_m": 76.0,
   "midpoint_distance_m": 75.0,
   "start_elevation_m": 150.7157149524751,
   "end_elevation_m": 151.47902827580072,
   "start_xy": [
    341888.9929236788,
    284942.7480353991
   ],
   "end_xy": [
    341887.88568606623,
    284944.4082260166
   ]
  },
  "max_3m": {
   "gradient_pct": 36.185370854296174,
   "start_distance_m": 74.0,
   "end_distance_m": 77.0,
   "midpoint_distance_m": 75.5,
   "start_elevation_m": 150.7157149524751,
   "end_elevation_m": 151.801276078104,
   "start_xy": [
    341888.9929236788,
    284942.7480353991
   ],
   "end_xy": [
    341887.4438774961,
    284945.3053353675
   ]
  }
 },
 "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": 0.068,
   "obstruction_max_height_m": 24.91,
   "flagged_windows_m": [
    5,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/SO3580.tif",
   "data/cache/england/bulk_dtm_1m/SO4080.tif",
   "data/cache/england/bulk_dtm_1m/SO3585.tif",
   "data/cache/england/bulk_dtm_1m/SO4085.tif"
  ],
  "calculated_at": "2026-08-15T14:52:25+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": [
   "SO3580.tif",
   "SO4080.tif",
   "SO3585.tif",
   "SO4085.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.7% over 200 m (Terrain 50), gain 117.8 m over 3023 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 (52.4646, -2.8773)'"
 },
 "area": {
  "place": "Cheney Longville",
  "county": "Shropshire"
 }
}