{
 "ocl_version": "0.1.0",
 "name": "Lane near South Brent",
 "slug": "discovered-lane-50-4245-3-8112",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 55.68486882138899,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 353.0,
   "end_distance_m": 355.0,
   "start_elevation_m": 138.66821483242265,
   "end_elevation_m": 139.78191220885043,
   "min_gradient_pct": -25.90880160435063
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 50.33895195111313,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 352.0,
   "end_distance_m": 355.0,
   "start_elevation_m": 138.27174365031703,
   "end_elevation_m": 139.78191220885043,
   "min_gradient_pct": -23.810208398912398
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 45.527659368320315,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 350.0,
   "end_distance_m": 355.0,
   "start_elevation_m": 137.5055292404344,
   "end_elevation_m": 139.78191220885043,
   "min_gradient_pct": -15.062838745702152
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 34.22877846327651,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 346.0,
   "end_distance_m": 356.0,
   "start_elevation_m": 136.6228351987445,
   "end_elevation_m": 140.04571304507215,
   "min_gradient_pct": -7.410858285355459
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.266022224759155,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 292.0,
   "end_distance_m": 312.0,
   "start_elevation_m": 128.16127003997894,
   "end_elevation_m": 133.21447448493078,
   "min_gradient_pct": -1.4925448844431344
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.88143750488194,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 38.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 98.32611979236543,
   "end_elevation_m": 104.29647916858592,
   "min_gradient_pct": -0.5083131306696487
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.562292990332935,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 331.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 134.71114737556258,
   "end_elevation_m": 144.49229387072904,
   "min_gradient_pct": 2.366218607829637
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.88060634075029,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 281.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 126.61168752997875,
   "end_elevation_m": 144.49229387072904,
   "min_gradient_pct": 3.5787165121917894
  }
 ],
 "shape": {
  "ascent_concentration": 0.338,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 111.0,
  "shape_class": "sustained"
 },
 "length_m": 800.1445748968498,
 "start_elevation_m": 94.79017335351628,
 "end_elevation_m": 178.92725457153338,
 "endpoint_gain_m": 84.1370812180171,
 "overall_gradient_pct": 10.515234853509266,
 "accumulated_ascent_m": 91.1639666606664,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 45.527659368320315,
   "start_distance_m": 350.0,
   "end_distance_m": 355.0,
   "midpoint_distance_m": 352.5,
   "start_elevation_m": 137.5055292404344,
   "end_elevation_m": 139.78191220885043,
   "start_xy": [
    271599.0120600035,
    59975.353178154626
   ],
   "end_xy": [
    271603.99685451237,
    59975.74282376768
   ]
  },
  "max_10m": {
   "gradient_pct": 34.22877846327651,
   "start_distance_m": 346.0,
   "end_distance_m": 356.0,
   "midpoint_distance_m": 351.0,
   "start_elevation_m": 136.6228351987445,
   "end_elevation_m": 140.04571304507215,
   "start_xy": [
    271595.02422439633,
    59975.04146166419
   ],
   "end_xy": [
    271604.9938134142,
    59975.820752890286
   ]
  },
  "max_20m": {
   "gradient_pct": 25.266022224759155,
   "start_distance_m": 292.0,
   "end_distance_m": 312.0,
   "midpoint_distance_m": 302.0,
   "start_elevation_m": 128.16127003997894,
   "end_elevation_m": 133.21447448493078,
   "start_xy": [
    271549.7826895274,
    59951.245801806894
   ],
   "end_xy": [
    271564.4310421231,
    59964.862914798694
   ]
  },
  "max_25m": {
   "gradient_pct": 23.88143750488194,
   "start_distance_m": 38.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 50.5,
   "start_elevation_m": 98.32611979236543,
   "end_elevation_m": 104.29647916858592,
   "start_xy": [
    271333.0837038781,
    59824.274558900244
   ],
   "end_xy": [
    271356.8308774821,
    59832.08940028199
   ]
  },
  "max_50m": {
   "gradient_pct": 19.562292990332935,
   "start_distance_m": 331.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 356.0,
   "start_elevation_m": 134.71114737556258,
   "end_elevation_m": 144.49229387072904,
   "start_xy": [
    271580.0698408695,
    59973.87252482505
   ],
   "end_xy": [
    271629.9177859588,
    59977.76898095552
   ]
  },
  "max_100m": {
   "gradient_pct": 17.88060634075029,
   "start_distance_m": 281.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 331.0,
   "start_elevation_m": 126.61168752997875,
   "end_elevation_m": 144.49229387072904,
   "start_xy": [
    271541.72609559976,
    59943.75638966141
   ],
   "end_xy": [
    271629.9177859588,
    59977.76898095552
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.062838745702152,
   "start_distance_m": 587.0,
   "end_distance_m": 592.0,
   "midpoint_distance_m": 589.5,
   "start_elevation_m": 169.79058868436564,
   "end_elevation_m": 169.03744674708054,
   "start_xy": [
    271833.9820413928,
    59961.314975253896
   ],
   "end_xy": [
    271838.8153275415,
    59960.034606164314
   ]
  },
  "min_10m": {
   "gradient_pct": -7.410858285355459,
   "start_distance_m": 587.0,
   "end_distance_m": 597.0,
   "midpoint_distance_m": 592.0,
   "start_elevation_m": 169.79058868436564,
   "end_elevation_m": 169.0495028558301,
   "start_xy": [
    271833.9820413928,
    59961.314975253896
   ],
   "end_xy": [
    271843.6179859688,
    59958.64652852666
   ]
  },
  "min_20m": {
   "gradient_pct": -1.4925448844431344,
   "start_distance_m": 263.0,
   "end_distance_m": 283.0,
   "midpoint_distance_m": 273.0,
   "start_elevation_m": 127.17425878086507,
   "end_elevation_m": 126.87574980397645,
   "start_xy": [
    271528.5425782636,
    59931.500987968786
   ],
   "end_xy": [
    271543.1909308593,
    59945.118100960586
   ]
  },
  "min_25m": {
   "gradient_pct": -0.5083131306696487,
   "start_distance_m": 253.0,
   "end_distance_m": 278.0,
   "midpoint_distance_m": 265.5,
   "start_elevation_m": 126.84276473975584,
   "end_elevation_m": 126.71568645708842,
   "start_xy": [
    271521.21840196574,
    59924.69243147289
   ],
   "end_xy": [
    271539.52884271037,
    59941.713822712634
   ]
  },
  "min_50m": {
   "gradient_pct": 2.366218607829637,
   "start_distance_m": 710.0,
   "end_distance_m": 760.0,
   "midpoint_distance_m": 735.0,
   "start_elevation_m": 175.63385295403486,
   "end_elevation_m": 176.81696225794968,
   "start_xy": [
    271951.7323219909,
    59925.77875789168
   ],
   "end_xy": [
    272000.25625995104,
    59913.78206795243
   ]
  },
  "min_100m": {
   "gradient_pct": 3.5787165121917894,
   "start_distance_m": 665.0,
   "end_distance_m": 765.0,
   "midpoint_distance_m": 715.0,
   "start_elevation_m": 173.42635919399456,
   "end_elevation_m": 177.00507570618635,
   "start_xy": [
    271908.67794038914,
    59938.8676931003
   ],
   "end_xy": [
    272005.1235104014,
    59912.63757109625
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 55.68486882138899,
   "start_distance_m": 353.0,
   "end_distance_m": 355.0,
   "midpoint_distance_m": 354.0,
   "start_elevation_m": 138.66821483242265,
   "end_elevation_m": 139.78191220885043,
   "start_xy": [
    271602.0029367088,
    59975.58696552246
   ],
   "end_xy": [
    271603.99685451237,
    59975.74282376768
   ]
  },
  "max_3m": {
   "gradient_pct": 50.33895195111313,
   "start_distance_m": 352.0,
   "end_distance_m": 355.0,
   "midpoint_distance_m": 353.5,
   "start_elevation_m": 138.27174365031703,
   "end_elevation_m": 139.78191220885043,
   "start_xy": [
    271601.00597780704,
    59975.509036399846
   ],
   "end_xy": [
    271603.99685451237,
    59975.74282376768
   ]
  }
 },
 "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": 0.135,
   "obstruction_max_height_m": 9.83,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "review": [
   "max5_over_45",
   "short_window_divergence"
  ],
  "extent": []
 },
 "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/SX7055.tif"
  ],
  "calculated_at": "2026-08-15T01:19:15+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",
  "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": [
   "SX7055.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.1% over 200 m (Terrain 50), gain 34.7 m over 324 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. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-50-4256-3-8064",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4245, -3.8112)'"
 },
 "area": {
  "place": "South Brent",
  "county": "Devon"
 }
}