{
 "ocl_version": "0.1.0",
 "name": "Brayford to Berry Hill",
 "slug": "discovered-lane-51-1055-3-8849",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 50.688845066108,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1084.0,
   "end_distance_m": 1086.0,
   "start_elevation_m": 184.73794971740278,
   "end_elevation_m": 185.75172661872494,
   "min_gradient_pct": -74.09199286099692,
   "suppressed_max_gradient_pct": 119.28430646028403,
   "suppressed_location_m": [
    255.0,
    257.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 44.9252528134006,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1083.0,
   "end_distance_m": 1086.0,
   "start_elevation_m": 184.40396903432293,
   "end_elevation_m": 185.75172661872494,
   "min_gradient_pct": -58.3505879706261,
   "suppressed_max_gradient_pct": 95.25702254421542,
   "suppressed_location_m": [
    1027.0,
    1030.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.53454205030573,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 933.0,
   "end_distance_m": 938.0,
   "start_elevation_m": 162.21493746662594,
   "end_elevation_m": 164.14166456914123,
   "min_gradient_pct": -46.338242051934344,
   "suppressed_max_gradient_pct": 78.05793518296582,
   "suppressed_location_m": [
    252.0,
    257.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.124011394275954,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 951.0,
   "end_distance_m": 961.0,
   "start_elevation_m": 167.19283638313047,
   "end_elevation_m": 170.20523752255806,
   "min_gradient_pct": -30.400927629658838,
   "suppressed_max_gradient_pct": 41.78320561489585,
   "suppressed_location_m": [
    1022.0,
    1032.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.45031326077958,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 932.0,
   "end_distance_m": 952.0,
   "start_elevation_m": 161.84470919936055,
   "end_elevation_m": 167.53477185151647,
   "min_gradient_pct": -23.449560247756835,
   "suppressed_max_gradient_pct": 33.44530460053562,
   "suppressed_location_m": [
    946.0,
    966.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.955174234710967,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 932.0,
   "end_distance_m": 957.0,
   "start_elevation_m": 161.84470919936055,
   "end_elevation_m": 168.8335027580383,
   "min_gradient_pct": -22.49562014263404,
   "suppressed_max_gradient_pct": 31.540142434620407,
   "suppressed_location_m": [
    941.0,
    966.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 14.66564474178216,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 970.0,
   "end_distance_m": 1020.0,
   "start_elevation_m": 172.99922170193062,
   "end_elevation_m": 180.3320440728217,
   "min_gradient_pct": -18.881058705642317,
   "suppressed_max_gradient_pct": 25.234881983665105,
   "suppressed_location_m": [
    931.0,
    981.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 7.330880906574691,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 3366.0,
   "end_distance_m": 3466.0,
   "start_elevation_m": 282.607916513831,
   "end_elevation_m": 289.9387974204057,
   "min_gradient_pct": -5.024068305242366,
   "suppressed_max_gradient_pct": 22.79861060925404,
   "suppressed_location_m": [
    932.0,
    1032.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.415,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 },
 "length_m": 4165.37259573656,
 "start_elevation_m": 146.94925689025845,
 "end_elevation_m": 308.18419461791893,
 "endpoint_gain_m": 161.23493772766048,
 "overall_gradient_pct": 3.8708406996457283,
 "accumulated_ascent_m": 231.6651528021787,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.53454205030573,
   "start_distance_m": 933.0,
   "end_distance_m": 938.0,
   "midpoint_distance_m": 935.5,
   "start_elevation_m": 162.21493746662594,
   "end_elevation_m": 164.14166456914123,
   "start_xy": [
    268168.3315490418,
    135423.22339950968
   ],
   "end_xy": [
    268168.8651870171,
    135428.19484039597
   ]
  },
  "max_10m": {
   "gradient_pct": 30.124011394275954,
   "start_distance_m": 951.0,
   "end_distance_m": 961.0,
   "midpoint_distance_m": 956.0,
   "start_elevation_m": 167.19283638313047,
   "end_elevation_m": 170.20523752255806,
   "start_xy": [
    268170.25257009856,
    135441.12059512147
   ],
   "end_xy": [
    268171.3205492711,
    135451.06340164004
   ]
  },
  "max_20m": {
   "gradient_pct": 28.45031326077958,
   "start_distance_m": 932.0,
   "end_distance_m": 952.0,
   "midpoint_distance_m": 942.0,
   "start_elevation_m": 161.84470919936055,
   "end_elevation_m": 167.53477185151647,
   "start_xy": [
    268168.22452147864,
    135422.22914345577
   ],
   "end_xy": [
    268170.3595583203,
    135442.11485540817
   ]
  },
  "max_25m": {
   "gradient_pct": 27.955174234710967,
   "start_distance_m": 932.0,
   "end_distance_m": 957.0,
   "midpoint_distance_m": 944.5,
   "start_elevation_m": 161.84470919936055,
   "end_elevation_m": 168.8335027580383,
   "start_xy": [
    268168.22452147864,
    135422.22914345577
   ],
   "end_xy": [
    268170.8935340413,
    135447.08626015927
   ]
  },
  "max_50m": {
   "gradient_pct": 14.66564474178216,
   "start_distance_m": 970.0,
   "end_distance_m": 1020.0,
   "midpoint_distance_m": 995.0,
   "start_elevation_m": 172.99922170193062,
   "end_elevation_m": 180.3320440728217,
   "start_xy": [
    268172.28150090313,
    135460.01195231517
   ],
   "end_xy": [
    268193.8872082528,
    135504.7178764385
   ]
  },
  "max_100m": {
   "gradient_pct": 7.330880906574691,
   "start_distance_m": 3366.0,
   "end_distance_m": 3466.0,
   "midpoint_distance_m": 3416.0,
   "start_elevation_m": 282.607916513831,
   "end_elevation_m": 289.9387974204057,
   "start_xy": [
    266459.1793578707,
    136632.24299692787
   ],
   "end_xy": [
    266447.222409234,
    136731.52556832522
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -46.338242051934344,
   "start_distance_m": 243.0,
   "end_distance_m": 248.0,
   "midpoint_distance_m": 245.5,
   "start_elevation_m": 161.06416417711918,
   "end_elevation_m": 158.74725207452246,
   "start_xy": [
    268569.9509297548,
    134889.96545537555
   ],
   "end_xy": [
    268567.6031803505,
    134894.37998457556
   ]
  },
  "min_10m": {
   "gradient_pct": -30.400927629658838,
   "start_distance_m": 879.0,
   "end_distance_m": 889.0,
   "midpoint_distance_m": 884.0,
   "start_elevation_m": 171.03695502398378,
   "end_elevation_m": 167.9968622610179,
   "start_xy": [
    268181.10976392246,
    135371.3175218492
   ],
   "end_xy": [
    268177.9194789331,
    135380.79201952083
   ]
  },
  "min_20m": {
   "gradient_pct": -23.449560247756835,
   "start_distance_m": 902.0,
   "end_distance_m": 922.0,
   "midpoint_distance_m": 912.0,
   "start_elevation_m": 167.61148529062956,
   "end_elevation_m": 162.9215732410782,
   "start_xy": [
    268174.1584598811,
    135393.23608239237
   ],
   "end_xy": [
    268168.3725243979,
    135412.38086948683
   ]
  },
  "min_25m": {
   "gradient_pct": -22.49562014263404,
   "start_distance_m": 901.0,
   "end_distance_m": 926.0,
   "midpoint_distance_m": 913.5,
   "start_elevation_m": 167.75118207730264,
   "end_elevation_m": 162.12727704164413,
   "start_xy": [
    268174.44787178875,
    135392.27887784832
   ],
   "end_xy": [
    268167.5835575246,
    135416.26347831273
   ]
  },
  "min_50m": {
   "gradient_pct": -18.881058705642317,
   "start_distance_m": 875.0,
   "end_distance_m": 925.0,
   "midpoint_distance_m": 900.0,
   "start_elevation_m": 171.78116111146846,
   "end_elevation_m": 162.3406317586473,
   "start_xy": [
    268182.4618385633,
    135367.55296423647
   ],
   "end_xy": [
    268167.5838432863,
    135415.26686165633
   ]
  },
  "min_100m": {
   "gradient_pct": -5.024068305242366,
   "start_distance_m": 831.0,
   "end_distance_m": 931.0,
   "midpoint_distance_m": 881.0,
   "start_elevation_m": 166.71373030141234,
   "end_elevation_m": 161.68966199616997,
   "start_xy": [
    268197.33188498294,
    135326.14183500313
   ],
   "end_xy": [
    268168.1175609848,
    135421.23488018577
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 50.688845066108,
   "start_distance_m": 1084.0,
   "end_distance_m": 1086.0,
   "midpoint_distance_m": 1085.0,
   "start_elevation_m": 184.73794971740278,
   "end_elevation_m": 185.75172661872494,
   "start_xy": [
    268219.8202805456,
    135562.9876938715
   ],
   "end_xy": [
    268220.4551351276,
    135564.8842589935
   ]
  },
  "max_3m": {
   "gradient_pct": 44.9252528134006,
   "start_distance_m": 1083.0,
   "end_distance_m": 1086.0,
   "midpoint_distance_m": 1084.5,
   "start_elevation_m": 184.40396903432293,
   "end_elevation_m": 185.75172661872494,
   "start_xy": [
    268219.5025971418,
    135562.03949713957
   ],
   "end_xy": [
    268220.4551351276,
    135564.8842589935
   ]
  }
 },
 "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": 0.169,
   "obstruction_max_height_m": 21.42,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.027,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    73.0,
    78.0
   ],
   [
    242.0,
    248.0
   ],
   [
    250.0,
    259.0
   ],
   [
    348.0,
    353.0
   ],
   [
    356.0,
    361.0
   ],
   [
    849.0,
    855.0
   ],
   [
    885.0,
    890.0
   ],
   [
    962.0,
    967.0
   ],
   [
    1025.0,
    1032.0
   ],
   [
    1062.0,
    1067.0
   ],
   [
    1128.0,
    1133.0
   ],
   [
    1140.0,
    1145.0
   ],
   [
    1267.0,
    1272.0
   ],
   [
    1276.0,
    1284.0
   ],
   [
    1294.0,
    1299.0
   ],
   [
    1588.0,
    1593.0
   ],
   [
    1613.0,
    1618.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/SS6530.tif",
   "data/cache/england/bulk_dtm_1m/SS6535.tif"
  ],
  "calculated_at": "2026-08-19T18:22:42+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": [
   "SS6530.tif",
   "SS6535.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.5% over 200 m (Terrain 50), gain 105.8 m over 2758 m way. EXTENDED by graph walk: +2 segment(s) at base, +2 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): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.1055, -3.8849)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.1055, -3.8849)'"
 },
 "area": {
  "place": "Brayford",
  "county": "Devon"
 }
}