{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.1292, 1.2902)",
 "slug": "discovered-lane-51-1292-1-2902",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 41.46647934887007,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 217.0,
   "end_distance_m": 219.0,
   "start_elevation_m": 59.3463558724861,
   "end_elevation_m": 60.1756854594635,
   "min_gradient_pct": -7.522652286098719
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.67720011988077,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 217.0,
   "end_distance_m": 220.0,
   "start_elevation_m": 59.3463558724861,
   "end_elevation_m": 60.56667187608252,
   "min_gradient_pct": -7.059341473373119
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.56741718158122,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 216.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 59.117329325100954,
   "end_elevation_m": 60.895700184180015,
   "min_gradient_pct": -5.833973621533488
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.446570600916278,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 211.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 60.895700184180015,
   "min_gradient_pct": -4.021683102184994
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.260877023100946,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 211.0,
   "end_distance_m": 231.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 62.30321852870858,
   "min_gradient_pct": -2.166950418510325
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.198822054259892,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 196.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 55.84599467061504,
   "end_elevation_m": 60.895700184180015,
   "min_gradient_pct": -1.586040507644384
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.58195799933462,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 211.0,
   "end_distance_m": 261.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 67.3420221237557,
   "min_gradient_pct": -0.3170627974064786
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.715876851506174,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 212.0,
   "end_distance_m": 312.0,
   "start_elevation_m": 58.22272624389077,
   "end_elevation_m": 75.93860309539694,
   "min_gradient_pct": 0.8951917862897147
  }
 ],
 "shape": {
  "ascent_concentration": 0.422,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 196.0,
  "shape_class": "sustained"
 },
 "length_m": 332.999999999963,
 "start_elevation_m": 43.71821903198275,
 "end_elevation_m": 78.55664451659503,
 "endpoint_gain_m": 34.83842548461228,
 "overall_gradient_pct": 10.461989635019865,
 "accumulated_ascent_m": 35.51478240865494,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.56741718158122,
   "start_distance_m": 216.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 218.5,
   "start_elevation_m": 59.117329325100954,
   "end_elevation_m": 60.895700184180015,
   "start_xy": [
    630405.6367541773,
    141736.19915784095
   ],
   "end_xy": [
    630401.4280698014,
    141738.89859656437
   ]
  },
  "max_10m": {
   "gradient_pct": 28.446570600916278,
   "start_distance_m": 211.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 216.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 60.895700184180015,
   "start_xy": [
    630409.8334104874,
    141733.48139632295
   ],
   "end_xy": [
    630401.4280698014,
    141738.89859656437
   ]
  },
  "max_20m": {
   "gradient_pct": 21.260877023100946,
   "start_distance_m": 211.0,
   "end_distance_m": 231.0,
   "midpoint_distance_m": 221.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 62.30321852870858,
   "start_xy": [
    630409.8334104874,
    141733.48139632295
   ],
   "end_xy": [
    630393.1114273779,
    141744.44939333017
   ]
  },
  "max_25m": {
   "gradient_pct": 20.198822054259892,
   "start_distance_m": 196.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 208.5,
   "start_elevation_m": 55.84599467061504,
   "end_elevation_m": 60.895700184180015,
   "start_xy": [
    630422.1455264109,
    141724.913329378
   ],
   "end_xy": [
    630401.4280698014,
    141738.89859656437
   ]
  },
  "max_50m": {
   "gradient_pct": 18.58195799933462,
   "start_distance_m": 211.0,
   "end_distance_m": 261.0,
   "midpoint_distance_m": 236.0,
   "start_elevation_m": 58.05104312408839,
   "end_elevation_m": 67.3420221237557,
   "start_xy": [
    630409.8334104874,
    141733.48139632295
   ],
   "end_xy": [
    630368.3752417315,
    141761.4235202182
   ]
  },
  "max_100m": {
   "gradient_pct": 17.715876851506174,
   "start_distance_m": 212.0,
   "end_distance_m": 312.0,
   "midpoint_distance_m": 262.0,
   "start_elevation_m": 58.22272624389077,
   "end_elevation_m": 75.93860309539694,
   "start_xy": [
    630409.003513328,
    141734.03931248852
   ],
   "end_xy": [
    630326.3235648602,
    141790.27929889463
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.833973621533488,
   "start_distance_m": 11.0,
   "end_distance_m": 16.0,
   "midpoint_distance_m": 13.5,
   "start_elevation_m": 43.87045741370632,
   "end_elevation_m": 43.578758732629645,
   "start_xy": [
    630573.4023794733,
    141618.3984374827
   ],
   "end_xy": [
    630569.3169587717,
    141621.2810290667
   ]
  },
  "min_10m": {
   "gradient_pct": -4.021683102184994,
   "start_distance_m": 11.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 16.0,
   "start_elevation_m": 43.87045741370632,
   "end_elevation_m": 43.46828910348782,
   "start_xy": [
    630573.4023794733,
    141618.3984374827
   ],
   "end_xy": [
    630565.2313994745,
    141624.16342411644
   ]
  },
  "min_20m": {
   "gradient_pct": -2.166950418510325,
   "start_distance_m": 10.0,
   "end_distance_m": 30.0,
   "midpoint_distance_m": 20.0,
   "start_elevation_m": 43.86874421868722,
   "end_elevation_m": 43.435354134985154,
   "start_xy": [
    630574.2192091316,
    141617.8215585448
   ],
   "end_xy": [
    630557.8777195811,
    141629.3521977005
   ]
  },
  "min_25m": {
   "gradient_pct": -1.586040507644384,
   "start_distance_m": 11.0,
   "end_distance_m": 36.0,
   "midpoint_distance_m": 23.5,
   "start_elevation_m": 43.87045741370632,
   "end_elevation_m": 43.47394728679522,
   "start_xy": [
    630573.4023794733,
    141618.3984374827
   ],
   "end_xy": [
    630552.975330464,
    141632.81147145818
   ]
  },
  "min_50m": {
   "gradient_pct": -0.3170627974064786,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 43.71821903198275,
   "end_elevation_m": 43.55968763327951,
   "start_xy": [
    630582.256,
    141611.88
   ],
   "end_xy": [
    630541.5357594144,
    141640.88216991167
   ]
  },
  "min_100m": {
   "gradient_pct": 0.8951917862897147,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 43.71821903198275,
   "end_elevation_m": 44.61341081827246,
   "start_xy": [
    630582.256,
    141611.88
   ],
   "end_xy": [
    630500.6816619951,
    141669.70823871339
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 41.46647934887007,
   "start_distance_m": 217.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 218.0,
   "start_elevation_m": 59.3463558724861,
   "end_elevation_m": 60.1756854594635,
   "start_xy": [
    630404.795282994,
    141736.73945983752
   ],
   "end_xy": [
    630403.1117575505,
    141737.8191552022
   ]
  },
  "max_3m": {
   "gradient_pct": 40.67720011988077,
   "start_distance_m": 217.0,
   "end_distance_m": 220.0,
   "midpoint_distance_m": 218.5,
   "start_elevation_m": 59.3463558724861,
   "end_elevation_m": 60.56667187608252,
   "start_xy": [
    630404.795282994,
    141736.73945983752
   ],
   "end_xy": [
    630402.2695410586,
    141738.35829468296
   ]
  }
 },
 "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": 0.045,
   "obstruction_max_height_m": 6.45,
   "flagged_windows_m": [
    2,
    3,
    5,
    10
   ]
  },
  "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/dtm_1m/E630000_N140000_2000m.tif"
  ],
  "calculated_at": "2026-09-15T20:38:32+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "retro-260915-dogleg-all",
  "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": [
   "E630000_N140000_2000m.tif"
  ],
  "route_cut_m": 333.0,
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Dover",
  "county": "Kent"
 }
}