{
 "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": 44.441694350025784,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 44.0,
   "end_distance_m": 46.0,
   "start_elevation_m": 146.7201822562112,
   "end_elevation_m": 147.6090161432117,
   "min_gradient_pct": -24.562602015085133
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.35709306924392,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 44.0,
   "end_distance_m": 47.0,
   "start_elevation_m": 146.7201822562112,
   "end_elevation_m": 147.9608950482885,
   "min_gradient_pct": -22.937731066486815
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.48831337539673,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 42.0,
   "end_distance_m": 47.0,
   "start_elevation_m": 146.48647937951867,
   "end_elevation_m": 147.9608950482885,
   "min_gradient_pct": -21.032601197114786
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.614717150811543,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 42.0,
   "end_distance_m": 52.0,
   "start_elevation_m": 146.48647937951867,
   "end_elevation_m": 149.04795109459982,
   "min_gradient_pct": -15.28203058765257
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.2597478042166,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1645.0,
   "end_distance_m": 1665.0,
   "start_elevation_m": 243.78174458816466,
   "end_elevation_m": 248.43369414900798,
   "min_gradient_pct": -10.861872046417886
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.45339299488171,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1624.0,
   "end_distance_m": 1649.0,
   "start_elevation_m": 239.60631704933024,
   "end_elevation_m": 244.96966529805067,
   "min_gradient_pct": -10.498238309619182
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.762515851401023,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1614.0,
   "end_distance_m": 1664.0,
   "start_elevation_m": 237.89671223657302,
   "end_elevation_m": 248.27797016227353,
   "min_gradient_pct": -9.598881570176331
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.486481847389,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1591.0,
   "end_distance_m": 1691.0,
   "start_elevation_m": 234.2251451074091,
   "end_elevation_m": 249.7116269547981,
   "min_gradient_pct": -8.753500808655076
  }
 ],
 "shape": {
  "ascent_concentration": 0.408,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 82.0,
  "shape_class": "sustained"
 },
 "length_m": 3147.9180200945566,
 "start_elevation_m": 142.23441478280733,
 "end_elevation_m": 267.052043504503,
 "endpoint_gain_m": 124.81762872169566,
 "overall_gradient_pct": 3.96508511101399,
 "accumulated_ascent_m": 159.98363357364107,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.48831337539673,
   "start_distance_m": 42.0,
   "end_distance_m": 47.0,
   "midpoint_distance_m": 44.5,
   "start_elevation_m": 146.48647937951867,
   "end_elevation_m": 147.9608950482885,
   "start_xy": [
    341912.09351444343,
    284921.3226531067
   ],
   "end_xy": [
    341908.01962893375,
    284924.22152475856
   ]
  },
  "max_10m": {
   "gradient_pct": 25.614717150811543,
   "start_distance_m": 42.0,
   "end_distance_m": 52.0,
   "midpoint_distance_m": 47.0,
   "start_elevation_m": 146.48647937951867,
   "end_elevation_m": 149.04795109459982,
   "start_xy": [
    341912.09351444343,
    284921.3226531067
   ],
   "end_xy": [
    341903.94574342406,
    284927.12039641046
   ]
  },
  "max_20m": {
   "gradient_pct": 23.2597478042166,
   "start_distance_m": 1645.0,
   "end_distance_m": 1665.0,
   "midpoint_distance_m": 1655.0,
   "start_elevation_m": 243.78174458816466,
   "end_elevation_m": 248.43369414900798,
   "start_xy": [
    340621.90578745375,
    285487.32226473815
   ],
   "end_xy": [
    340603.0340264378,
    285486.05390363204
   ]
  },
  "max_25m": {
   "gradient_pct": 21.45339299488171,
   "start_distance_m": 1624.0,
   "end_distance_m": 1649.0,
   "midpoint_distance_m": 1636.5,
   "start_elevation_m": 239.60631704933024,
   "end_elevation_m": 244.96966529805067,
   "start_xy": [
    340631.49721852486,
    285472.6594197529
   ],
   "end_xy": [
    340618.8981125179,
    285488.1349545308
   ]
  },
  "max_50m": {
   "gradient_pct": 20.762515851401023,
   "start_distance_m": 1614.0,
   "end_distance_m": 1664.0,
   "midpoint_distance_m": 1639.0,
   "start_elevation_m": 237.89671223657302,
   "end_elevation_m": 248.27797016227353,
   "start_xy": [
    340641.3735348563,
    285473.9602179513
   ],
   "end_xy": [
    340604.0255318178,
    285486.1839693132
   ]
  },
  "max_100m": {
   "gradient_pct": 15.486481847389,
   "start_distance_m": 1591.0,
   "end_distance_m": 1691.0,
   "midpoint_distance_m": 1641.0,
   "start_elevation_m": 234.2251451074091,
   "end_elevation_m": 249.7116269547981,
   "start_xy": [
    340663.78910107183,
    285478.5179379081
   ],
   "end_xy": [
    340577.79146853613,
    285489.9167232754
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.032601197114786,
   "start_distance_m": 1581.0,
   "end_distance_m": 1586.0,
   "midpoint_distance_m": 1583.5,
   "start_elevation_m": 235.63269874151726,
   "end_elevation_m": 234.58106868166152,
   "start_xy": [
    340663.10825851973,
    285488.4779345569
   ],
   "end_xy": [
    340663.4619616526,
    285483.49046083825
   ]
  },
  "min_10m": {
   "gradient_pct": -15.28203058765257,
   "start_distance_m": 1578.0,
   "end_distance_m": 1588.0,
   "midpoint_distance_m": 1583.0,
   "start_elevation_m": 235.83738416349536,
   "end_elevation_m": 234.3091811047301,
   "start_xy": [
    340662.89603664004,
    285491.470418788
   ],
   "end_xy": [
    340663.60344290576,
    285481.49547135085
   ]
  },
  "min_20m": {
   "gradient_pct": -10.861872046417886,
   "start_distance_m": 2055.0,
   "end_distance_m": 2075.0,
   "midpoint_distance_m": 2065.0,
   "start_elevation_m": 272.45600346683517,
   "end_elevation_m": 270.2836290575516,
   "start_xy": [
    340312.70308285253,
    285370.8512379975
   ],
   "end_xy": [
    340292.81359289296,
    285368.75166919676
   ]
  },
  "min_25m": {
   "gradient_pct": -10.498238309619182,
   "start_distance_m": 2054.0,
   "end_distance_m": 2079.0,
   "midpoint_distance_m": 2066.5,
   "start_elevation_m": 272.5454893741317,
   "end_elevation_m": 269.9209297967269,
   "start_xy": [
    340313.6975573505,
    285370.95621643757
   ],
   "end_xy": [
    340288.83569490106,
    285368.3317554366
   ]
  },
  "min_50m": {
   "gradient_pct": -9.598881570176331,
   "start_distance_m": 2055.0,
   "end_distance_m": 2105.0,
   "midpoint_distance_m": 2080.0,
   "start_elevation_m": 272.45600346683517,
   "end_elevation_m": 267.656562681747,
   "start_xy": [
    340312.70308285253,
    285370.8512379975
   ],
   "end_xy": [
    340262.9736880154,
    285365.6826373421
   ]
  },
  "min_100m": {
   "gradient_pct": -8.753500808655076,
   "start_distance_m": 2045.0,
   "end_distance_m": 2145.0,
   "midpoint_distance_m": 2095.0,
   "start_elevation_m": 273.1748376000988,
   "end_elevation_m": 264.4213367914437,
   "start_xy": [
    340322.6478278323,
    285371.9010223979
   ],
   "end_xy": [
    340223.27949868573,
    285361.49339677306
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.441694350025784,
   "start_distance_m": 44.0,
   "end_distance_m": 46.0,
   "midpoint_distance_m": 45.0,
   "start_elevation_m": 146.7201822562112,
   "end_elevation_m": 147.6090161432117,
   "start_xy": [
    341910.46396023955,
    284922.48220176745
   ],
   "end_xy": [
    341908.8344060357,
    284923.6417504282
   ]
  },
  "max_3m": {
   "gradient_pct": 41.35709306924392,
   "start_distance_m": 44.0,
   "end_distance_m": 47.0,
   "midpoint_distance_m": 45.5,
   "start_elevation_m": 146.7201822562112,
   "end_elevation_m": 147.9608950482885,
   "start_xy": [
    341910.46396023955,
    284922.48220176745
   ],
   "end_xy": [
    341908.01962893375,
    284924.22152475856
   ]
  }
 },
 "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": 0.054,
   "obstruction_max_height_m": 24.92,
   "flagged_windows_m": [
    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": "2026-08-20T19:22:19+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": [
   "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. ADOPTED (England launch slice 2026-08-16): clean-steep,qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.4646, -2.8773)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.4646, -2.8773)'",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Cheney Longville",
  "county": "Shropshire"
 }
}