{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (54.4480, -3.0133)",
 "slug": "discovered-lane-54-4480-3-0133",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 50.91093536362479,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 842.0,
   "end_distance_m": 844.0,
   "start_elevation_m": 92.23427183788773,
   "end_elevation_m": 93.25249054516023,
   "min_gradient_pct": -32.54106638150418
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.2904423320706,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 842.0,
   "end_distance_m": 845.0,
   "start_elevation_m": 92.23427183788773,
   "end_elevation_m": 93.44298510784985,
   "min_gradient_pct": -30.339311915385753
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.27056017347098,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 142.0,
   "end_distance_m": 147.0,
   "start_elevation_m": 77.02006897374389,
   "end_elevation_m": 78.73359698241744,
   "min_gradient_pct": -26.834414603606547
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.176948261961115,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1043.0,
   "end_distance_m": 1053.0,
   "start_elevation_m": 101.27723981666159,
   "end_elevation_m": 104.1949346428577,
   "min_gradient_pct": -17.56923028914329
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.526762262828083,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1041.0,
   "end_distance_m": 1061.0,
   "start_elevation_m": 100.887883390408,
   "end_elevation_m": 106.39323584297362,
   "min_gradient_pct": -14.201578045130958
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.99529489644834,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1036.0,
   "end_distance_m": 1061.0,
   "start_elevation_m": 100.14441211886154,
   "end_elevation_m": 106.39323584297362,
   "min_gradient_pct": -13.418573594005352
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.545504726150284,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1012.0,
   "end_distance_m": 1062.0,
   "start_elevation_m": 96.77204868921805,
   "end_elevation_m": 106.5448010522932,
   "min_gradient_pct": -9.531996743749886
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.083876874087366,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1017.0,
   "end_distance_m": 1117.0,
   "start_elevation_m": 97.44453381083622,
   "end_elevation_m": 114.52841068492359,
   "min_gradient_pct": -5.9508131494273035
  }
 ],
 "shape": {
  "ascent_concentration": 0.389,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 160.0,
  "shape_class": "sustained"
 },
 "length_m": 1138.9718279399412,
 "start_elevation_m": 63.753926881854994,
 "end_elevation_m": 115.57755414160233,
 "endpoint_gain_m": 51.82362725974734,
 "overall_gradient_pct": 4.550035917348434,
 "accumulated_ascent_m": 77.71851659026187,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.27056017347098,
   "start_distance_m": 142.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 144.5,
   "start_elevation_m": 77.02006897374389,
   "end_elevation_m": 78.73359698241744,
   "start_xy": [
    334677.2391178757,
    506420.61044990964
   ],
   "end_xy": [
    334673.3024977068,
    506417.5277527715
   ]
  },
  "max_10m": {
   "gradient_pct": 29.176948261961115,
   "start_distance_m": 1043.0,
   "end_distance_m": 1053.0,
   "midpoint_distance_m": 1048.0,
   "start_elevation_m": 101.27723981666159,
   "end_elevation_m": 104.1949346428577,
   "start_xy": [
    334464.2215809183,
    506802.7529001266
   ],
   "end_xy": [
    334473.19897986704,
    506807.1581592694
   ]
  },
  "max_20m": {
   "gradient_pct": 27.526762262828083,
   "start_distance_m": 1041.0,
   "end_distance_m": 1061.0,
   "midpoint_distance_m": 1051.0,
   "start_elevation_m": 100.887883390408,
   "end_elevation_m": 106.39323584297362,
   "start_xy": [
    334462.42610112857,
    506801.87184829806
   ],
   "end_xy": [
    334480.366798752,
    506810.7079689238
   ]
  },
  "max_25m": {
   "gradient_pct": 24.99529489644834,
   "start_distance_m": 1036.0,
   "end_distance_m": 1061.0,
   "midpoint_distance_m": 1048.5,
   "start_elevation_m": 100.14441211886154,
   "end_elevation_m": 106.39323584297362,
   "start_xy": [
    334457.7915513152,
    506800.0021804581
   ],
   "end_xy": [
    334480.366798752,
    506810.7079689238
   ]
  },
  "max_50m": {
   "gradient_pct": 19.545504726150284,
   "start_distance_m": 1012.0,
   "end_distance_m": 1062.0,
   "midpoint_distance_m": 1037.0,
   "start_elevation_m": 96.77204868921805,
   "end_elevation_m": 106.5448010522932,
   "start_xy": [
    334435.00899151433,
    506792.79825145757
   ],
   "end_xy": [
    334481.2189883665,
    506811.23120200855
   ]
  },
  "max_100m": {
   "gradient_pct": 17.083876874087366,
   "start_distance_m": 1017.0,
   "end_distance_m": 1117.0,
   "midpoint_distance_m": 1067.0,
   "start_elevation_m": 97.44453381083622,
   "end_elevation_m": 114.52841068492359,
   "start_xy": [
    334439.9393068251,
    506793.63011138333
   ],
   "end_xy": [
    334531.4821670852,
    506797.668711591
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -26.834414603606547,
   "start_distance_m": 719.0,
   "end_distance_m": 724.0,
   "midpoint_distance_m": 721.5,
   "start_elevation_m": 90.05325296068978,
   "end_elevation_m": 88.71153223050945,
   "start_xy": [
    334342.28006474284,
    506553.2655202342
   ],
   "end_xy": [
    334344.82695066324,
    506557.568237063
   ]
  },
  "min_10m": {
   "gradient_pct": -17.56923028914329,
   "start_distance_m": 719.0,
   "end_distance_m": 729.0,
   "midpoint_distance_m": 724.0,
   "start_elevation_m": 90.05325296068978,
   "end_elevation_m": 88.29632993177545,
   "start_xy": [
    334342.28006474284,
    506553.2655202342
   ],
   "end_xy": [
    334347.3738365836,
    506561.8709538918
   ]
  },
  "min_20m": {
   "gradient_pct": -14.201578045130958,
   "start_distance_m": 361.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 371.0,
   "start_elevation_m": 94.54295842192724,
   "end_elevation_m": 91.70264281290105,
   "start_xy": [
    334478.71183855855,
    506340.8081456472
   ],
   "end_xy": [
    334459.5149315322,
    506335.1975520404
   ]
  },
  "min_25m": {
   "gradient_pct": -13.418573594005352,
   "start_distance_m": 360.0,
   "end_distance_m": 385.0,
   "midpoint_distance_m": 372.5,
   "start_elevation_m": 94.64322208537656,
   "end_elevation_m": 91.28857868687523,
   "start_xy": [
    334479.6716839099,
    506341.0886753276
   ],
   "end_xy": [
    334455.67555012694,
    506334.075433319
   ]
  },
  "min_50m": {
   "gradient_pct": -9.531996743749886,
   "start_distance_m": 675.0,
   "end_distance_m": 725.0,
   "midpoint_distance_m": 700.0,
   "start_elevation_m": 93.26414589997489,
   "end_elevation_m": 88.49814752809995,
   "start_xy": [
    334323.9064709485,
    506514.264953046
   ],
   "end_xy": [
    334345.33632784727,
    506558.4287804288
   ]
  },
  "min_100m": {
   "gradient_pct": -5.9508131494273035,
   "start_distance_m": 668.0,
   "end_distance_m": 768.0,
   "midpoint_distance_m": 718.0,
   "start_elevation_m": 93.40314845372947,
   "end_elevation_m": 87.45233530430217,
   "start_xy": [
    334324.9573756529,
    506507.45191844093
   ],
   "end_xy": [
    334364.1659214785,
    506596.9572488466
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 50.91093536362479,
   "start_distance_m": 842.0,
   "end_distance_m": 844.0,
   "midpoint_distance_m": 843.0,
   "start_elevation_m": 92.23427183788773,
   "end_elevation_m": 93.25249054516023,
   "start_xy": [
    334375.2213811068,
    506668.38874532416
   ],
   "end_xy": [
    334375.07383051165,
    506670.38329510344
   ]
  },
  "max_3m": {
   "gradient_pct": 40.2904423320706,
   "start_distance_m": 842.0,
   "end_distance_m": 845.0,
   "midpoint_distance_m": 843.5,
   "start_elevation_m": 92.23427183788773,
   "end_elevation_m": 93.44298510784985,
   "start_xy": [
    334375.2213811068,
    506668.38874532416
   ],
   "end_xy": [
    334375.00005521404,
    506671.38056999305
   ]
  }
 },
 "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": {
  "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/NY3005.tif"
  ],
  "calculated_at": "2026-09-01T14:00:34+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",
  "run_id": "chunk-07-260901",
  "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": [
   "NY3005.tif"
  ],
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 28] No space left on device: 'data/cache/england/bulk_dsm_1m/NY3005.tmp.tif'",
  "trimmed_from": "discovered-lane-54-4480-3-0133",
  "trim_cut_m": [
   [
    1139.0,
    1195.0
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Heron Island",
  "county": "Westmorland and Furness"
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    878.0,
    1051.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}