{
 "ocl_version": "0.1.0",
 "name": "Newtown Knott to Broad Oak",
 "slug": "discovered-lane-54-3373-3-3718",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.76590665833764,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1441.0,
   "end_distance_m": 1443.0,
   "start_elevation_m": 53.059116255669664,
   "end_elevation_m": 53.99443438883642,
   "min_gradient_pct": -17.6129708645707
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.7479965676122,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1440.0,
   "end_distance_m": 1443.0,
   "start_elevation_m": 52.77199449180805,
   "end_elevation_m": 53.99443438883642,
   "min_gradient_pct": -17.56343397364167
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 33.146051380944925,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1438.0,
   "end_distance_m": 1443.0,
   "start_elevation_m": 52.33713181978917,
   "end_elevation_m": 53.99443438883642,
   "min_gradient_pct": -17.20441324976605
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.239569771964796,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1438.0,
   "end_distance_m": 1448.0,
   "start_elevation_m": 52.33713181978917,
   "end_elevation_m": 55.06108879698565,
   "min_gradient_pct": -14.309425768196249
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.837613851781228,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1406.0,
   "end_distance_m": 1426.0,
   "start_elevation_m": 46.868441843362675,
   "end_elevation_m": 51.23596461371892,
   "min_gradient_pct": -13.36726801812876
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.754049981590295,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1404.0,
   "end_distance_m": 1429.0,
   "start_elevation_m": 46.509621066849334,
   "end_elevation_m": 51.69813356224691,
   "min_gradient_pct": -12.993235083661148
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.63873543071412,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1398.0,
   "end_distance_m": 1448.0,
   "start_elevation_m": 45.74172108162859,
   "end_elevation_m": 55.06108879698565,
   "min_gradient_pct": -12.154450785800535
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.055758587620332,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1359.0,
   "end_distance_m": 1459.0,
   "start_elevation_m": 39.373670250004764,
   "end_elevation_m": 56.429428837625096,
   "min_gradient_pct": -7.2619216044269095
  }
 ],
 "shape": {
  "ascent_concentration": 0.469,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 83.0,
  "shape_class": "stepped"
 },
 "length_m": 1684.4337091810964,
 "start_elevation_m": 6.02493410608926,
 "end_elevation_m": 69.85208166160523,
 "endpoint_gain_m": 63.827147555515964,
 "overall_gradient_pct": 3.7892347563233075,
 "accumulated_ascent_m": 79.08220305827655,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 33.146051380944925,
   "start_distance_m": 1438.0,
   "end_distance_m": 1443.0,
   "midpoint_distance_m": 1440.5,
   "start_elevation_m": 52.33713181978917,
   "end_elevation_m": 53.99443438883642,
   "start_xy": [
    311132.6329816432,
    494256.23348122067
   ],
   "end_xy": [
    311133.7568616608,
    494251.5200969963
   ]
  },
  "max_10m": {
   "gradient_pct": 27.239569771964796,
   "start_distance_m": 1438.0,
   "end_distance_m": 1448.0,
   "midpoint_distance_m": 1443.0,
   "start_elevation_m": 52.33713181978917,
   "end_elevation_m": 55.06108879698565,
   "start_xy": [
    311132.6329816432,
    494256.23348122067
   ],
   "end_xy": [
    311133.91775778023,
    494246.52268679836
   ]
  },
  "max_20m": {
   "gradient_pct": 21.837613851781228,
   "start_distance_m": 1406.0,
   "end_distance_m": 1426.0,
   "midpoint_distance_m": 1416.0,
   "start_elevation_m": 46.868441843362675,
   "end_elevation_m": 51.23596461371892,
   "start_xy": [
    311115.83146194404,
    494283.4676298072
   ],
   "end_xy": [
    311126.3130436373,
    494266.43438123015
   ]
  },
  "max_25m": {
   "gradient_pct": 20.754049981590295,
   "start_distance_m": 1404.0,
   "end_distance_m": 1429.0,
   "midpoint_distance_m": 1416.5,
   "start_elevation_m": 46.509621066849334,
   "end_elevation_m": 51.69813356224691,
   "start_xy": [
    311114.7901409946,
    494285.1751569051
   ],
   "end_xy": [
    311127.8931401189,
    494263.8842256147
   ]
  },
  "max_50m": {
   "gradient_pct": 18.63873543071412,
   "start_distance_m": 1398.0,
   "end_distance_m": 1448.0,
   "midpoint_distance_m": 1423.0,
   "start_elevation_m": 45.74172108162859,
   "end_elevation_m": 55.06108879698565,
   "start_xy": [
    311111.66711450566,
    494290.2983102436
   ],
   "end_xy": [
    311133.91775778023,
    494246.52268679836
   ]
  },
  "max_100m": {
   "gradient_pct": 17.055758587620332,
   "start_distance_m": 1359.0,
   "end_distance_m": 1459.0,
   "midpoint_distance_m": 1409.0,
   "start_elevation_m": 39.373670250004764,
   "end_elevation_m": 56.429428837625096,
   "start_xy": [
    311101.1796950801,
    494327.4707466411
   ],
   "end_xy": [
    311134.27076470514,
    494235.5283529635
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -17.20441324976605,
   "start_distance_m": 1215.0,
   "end_distance_m": 1220.0,
   "midpoint_distance_m": 1217.5,
   "start_elevation_m": 39.72585665356672,
   "end_elevation_m": 38.86563599107842,
   "start_xy": [
    310990.2666524306,
    494387.9070022478
   ],
   "end_xy": [
    310995.2059386896,
    494387.13018471975
   ]
  },
  "min_10m": {
   "gradient_pct": -14.309425768196249,
   "start_distance_m": 1215.0,
   "end_distance_m": 1225.0,
   "midpoint_distance_m": 1220.0,
   "start_elevation_m": 39.72585665356672,
   "end_elevation_m": 38.2949140767471,
   "start_xy": [
    310990.2666524306,
    494387.9070022478
   ],
   "end_xy": [
    311000.14519008744,
    494386.3531452798
   ]
  },
  "min_20m": {
   "gradient_pct": -13.36726801812876,
   "start_distance_m": 1215.0,
   "end_distance_m": 1235.0,
   "midpoint_distance_m": 1225.0,
   "start_elevation_m": 39.72585665356672,
   "end_elevation_m": 37.05240304994097,
   "start_xy": [
    310990.2666524306,
    494387.9070022478
   ],
   "end_xy": [
    311010.02387051214,
    494384.8001954156
   ]
  },
  "min_25m": {
   "gradient_pct": -12.993235083661148,
   "start_distance_m": 1215.0,
   "end_distance_m": 1240.0,
   "midpoint_distance_m": 1227.5,
   "start_elevation_m": 39.72585665356672,
   "end_elevation_m": 36.477547882651436,
   "start_xy": [
    310990.2666524306,
    494387.9070022478
   ],
   "end_xy": [
    311014.96327535424,
    494384.0241319029
   ]
  },
  "min_50m": {
   "gradient_pct": -12.154450785800535,
   "start_distance_m": 1215.0,
   "end_distance_m": 1265.0,
   "midpoint_distance_m": 1240.0,
   "start_elevation_m": 39.72585665356672,
   "end_elevation_m": 33.648631260666455,
   "start_xy": [
    310990.2666524306,
    494387.9070022478
   ],
   "end_xy": [
    311039.65988744964,
    494380.1411927584
   ]
  },
  "min_100m": {
   "gradient_pct": -7.2619216044269095,
   "start_distance_m": 1181.0,
   "end_distance_m": 1281.0,
   "midpoint_distance_m": 1231.0,
   "start_elevation_m": 40.57171534473617,
   "end_elevation_m": 33.30979374030926,
   "start_xy": [
    310956.43788081553,
    494390.17879635753
   ],
   "end_xy": [
    311055.46573397133,
    494377.6562059113
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.76590665833764,
   "start_distance_m": 1441.0,
   "end_distance_m": 1443.0,
   "midpoint_distance_m": 1442.0,
   "start_elevation_m": 53.059116255669664,
   "end_elevation_m": 53.99443438883642,
   "start_xy": [
    311133.69274553895,
    494253.5190689556
   ],
   "end_xy": [
    311133.7568616608,
    494251.5200969963
   ]
  },
  "max_3m": {
   "gradient_pct": 40.7479965676122,
   "start_distance_m": 1440.0,
   "end_distance_m": 1443.0,
   "midpoint_distance_m": 1441.5,
   "start_elevation_m": 52.77199449180805,
   "end_elevation_m": 53.99443438883642,
   "start_xy": [
    311133.6356360241,
    494254.5173950017
   ],
   "end_xy": [
    311133.7568616608,
    494251.5200969963
   ]
  }
 },
 "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": 0.066,
   "obstruction_max_height_m": 11.58,
   "flagged_windows_m": [
    100
   ]
  },
  "review": [],
  "extent": [
   "may_continue_beyond_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/SD1090.tif",
   "data/cache/england/bulk_dtm_1m/SD0595.tif",
   "data/cache/england/bulk_dtm_1m/SD1095.tif"
  ],
  "calculated_at": "2026-08-19T18:30:30+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": [
   "SD1090.tif",
   "SD0595.tif",
   "SD1095.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.6% over 200 m (Terrain 50), gain 58.8 m over 1585 m way. EXTENDED by graph walk: +0 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): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (54.3373, -3.3718)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (54.3373, -3.3718)'"
 },
 "area": {
  "place": "Newbiggin",
  "county": "Cumberland"
 }
}