{
 "ocl_version": "0.1.0",
 "name": "Westville to Easton",
 "slug": "discovered-lane-50-2746-3-7797",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.53815464116514,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 185.0,
   "end_distance_m": 187.0,
   "start_elevation_m": 29.024326379245167,
   "end_elevation_m": 29.73508947206847,
   "min_gradient_pct": -18.04405789948582
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.8780789416446,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 486.0,
   "end_distance_m": 489.0,
   "start_elevation_m": 39.49349313548639,
   "end_elevation_m": 40.44983550373573,
   "min_gradient_pct": -14.563599174823358
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.46872447497749,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 169.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 26.26168553399241,
   "end_elevation_m": 27.585121757741284,
   "min_gradient_pct": -9.55548328601651
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.54692050469481,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 164.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 25.230429707271803,
   "end_elevation_m": 27.585121757741284,
   "min_gradient_pct": -7.7389020694445065
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.128657590266055,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 154.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 22.959390239688073,
   "end_elevation_m": 27.585121757741284,
   "min_gradient_pct": -7.207150337543418
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.73562691493953,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 149.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 21.9012150290064,
   "end_elevation_m": 27.585121757741284,
   "min_gradient_pct": -7.129365154432634
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.34230140275813,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 124.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 16.913971056362218,
   "end_elevation_m": 27.585121757741284,
   "min_gradient_pct": -5.996865115704977
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.06533679209309,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 89.0,
   "end_distance_m": 189.0,
   "start_elevation_m": 11.053691514501693,
   "end_elevation_m": 30.11902830659478,
   "min_gradient_pct": -3.7428141433200106
  }
 ],
 "shape": {
  "ascent_concentration": 0.54,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 180.0,
  "shape_class": "stepped"
 },
 "length_m": 640.000000000007,
 "start_elevation_m": 2.661928824483718,
 "end_elevation_m": 48.43212757849564,
 "endpoint_gain_m": 45.77019875401192,
 "overall_gradient_pct": 7.151593555314284,
 "accumulated_ascent_m": 52.01267999314281,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.46872447497749,
   "start_distance_m": 169.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 171.5,
   "start_elevation_m": 26.26168553399241,
   "end_elevation_m": 27.585121757741284,
   "start_xy": [
    273439.6666799916,
    43482.26513579305
   ],
   "end_xy": [
    273440.8197345138,
    43477.39990613894
   ]
  },
  "max_10m": {
   "gradient_pct": 23.54692050469481,
   "start_distance_m": 164.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 169.0,
   "start_elevation_m": 25.230429707271803,
   "end_elevation_m": 27.585121757741284,
   "start_xy": [
    273438.5037524592,
    43487.127968307606
   ],
   "end_xy": [
    273440.8197345138,
    43477.39990613894
   ]
  },
  "max_20m": {
   "gradient_pct": 23.128657590266055,
   "start_distance_m": 154.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 164.0,
   "start_elevation_m": 22.959390239688073,
   "end_elevation_m": 27.585121757741284,
   "start_xy": [
    273436.08969337627,
    43496.832209232416
   ],
   "end_xy": [
    273440.8197345138,
    43477.39990613894
   ]
  },
  "max_25m": {
   "gradient_pct": 22.73562691493953,
   "start_distance_m": 149.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 161.5,
   "start_elevation_m": 21.9012150290064,
   "end_elevation_m": 27.585121757741284,
   "start_xy": [
    273434.88172451453,
    43501.68409595415
   ],
   "end_xy": [
    273440.8197345138,
    43477.39990613894
   ]
  },
  "max_50m": {
   "gradient_pct": 21.34230140275813,
   "start_distance_m": 124.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 149.0,
   "start_elevation_m": 16.913971056362218,
   "end_elevation_m": 27.585121757741284,
   "start_xy": [
    273428.8468053664,
    43525.94475514218
   ],
   "end_xy": [
    273440.8197345138,
    43477.39990613894
   ]
  },
  "max_100m": {
   "gradient_pct": 19.06533679209309,
   "start_distance_m": 89.0,
   "end_distance_m": 189.0,
   "midpoint_distance_m": 139.0,
   "start_elevation_m": 11.053691514501693,
   "end_elevation_m": 30.11902830659478,
   "start_xy": [
    273419.64976195246,
    43559.711295209185
   ],
   "end_xy": [
    273444.2786733314,
    43462.80416384634
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.55548328601651,
   "start_distance_m": 506.0,
   "end_distance_m": 511.0,
   "midpoint_distance_m": 508.5,
   "start_elevation_m": 40.734592694218605,
   "end_elevation_m": 40.25681852991778,
   "start_xy": [
    273294.17855321954,
    43216.196333449385
   ],
   "end_xy": [
    273293.5875592369,
    43211.23138408724
   ]
  },
  "min_10m": {
   "gradient_pct": -7.7389020694445065,
   "start_distance_m": 398.0,
   "end_distance_m": 408.0,
   "midpoint_distance_m": 403.0,
   "start_elevation_m": 37.85299639205513,
   "end_elevation_m": 37.07910618511068,
   "start_xy": [
    273351.9160141145,
    43295.00622477893
   ],
   "end_xy": [
    273343.21605366195,
    43290.48659622445
   ]
  },
  "min_20m": {
   "gradient_pct": -7.207150337543418,
   "start_distance_m": 388.0,
   "end_distance_m": 408.0,
   "midpoint_distance_m": 398.0,
   "start_elevation_m": 38.520536252619365,
   "end_elevation_m": 37.07910618511068,
   "start_xy": [
    273359.689171939,
    43301.297329664885
   ],
   "end_xy": [
    273343.21605366195,
    43290.48659622445
   ]
  },
  "min_25m": {
   "gradient_pct": -7.129365154432634,
   "start_distance_m": 387.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 399.5,
   "start_elevation_m": 38.5962947089251,
   "end_elevation_m": 36.81395342031694,
   "start_xy": [
    273360.4668012547,
    43301.92605268538
   ],
   "end_xy": [
    273339.3740218512,
    43289.37358698907
   ]
  },
  "min_50m": {
   "gradient_pct": -5.996865115704977,
   "start_distance_m": 369.0,
   "end_distance_m": 419.0,
   "midpoint_distance_m": 394.0,
   "start_elevation_m": 39.42319259808298,
   "end_elevation_m": 36.42476004023049,
   "start_xy": [
    273374.4590942205,
    43313.24928954327
   ],
   "end_xy": [
    273332.65048861573,
    43287.425743578315
   ]
  },
  "min_100m": {
   "gradient_pct": -3.7428141433200106,
   "start_distance_m": 325.0,
   "end_distance_m": 425.0,
   "midpoint_distance_m": 375.0,
   "start_elevation_m": 40.13061027593059,
   "end_elevation_m": 36.38779613261058,
   "start_xy": [
    273406.2388192298,
    43343.55892336578
   ],
   "end_xy": [
    273326.88757228485,
    43285.755776373764
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.53815464116514,
   "start_distance_m": 185.0,
   "end_distance_m": 187.0,
   "midpoint_distance_m": 186.0,
   "start_elevation_m": 29.024326379245167,
   "end_elevation_m": 29.73508947206847,
   "start_xy": [
    273443.35660841496,
    43466.6964372825
   ],
   "end_xy": [
    273443.8176408732,
    43464.75030056442
   ]
  },
  "max_3m": {
   "gradient_pct": 31.8780789416446,
   "start_distance_m": 486.0,
   "end_distance_m": 489.0,
   "midpoint_distance_m": 487.5,
   "start_elevation_m": 39.49349313548639,
   "end_elevation_m": 40.44983550373573,
   "start_xy": [
    273297.6904135582,
    43235.862260680595
   ],
   "end_xy": [
    273297.04640056123,
    43232.93220162012
   ]
  }
 },
 "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": 0.053,
   "obstruction_max_height_m": 7.28,
   "flagged_windows_m": [
    2
   ]
  },
  "review": [],
  "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/SX7040.tif"
  ],
  "calculated_at": "2026-08-19T18:08:04+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": [
   "SX7040.tif"
  ],
  "route_summit_trim_m": 969.3,
  "route_summit_trim_loss_m": 9.2,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.8% over 200 m (Terrain 50), gain 25.7 m over 1363 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. ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (50.2746, -3.7797)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.2746, -3.7797)'"
 },
 "area": {
  "place": "Kingsbridge",
  "county": "Devon"
 }
}