{
 "ocl_version": "0.1.0",
 "name": "Reybridge to Nocketts Hill",
 "slug": "discovered-lane-51-4221-2-0966",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.60889472852173,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 581.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 109.9294719369611,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": -13.71166213545223
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.10090075376447,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 580.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 109.6586228089186,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": -8.004499808937501
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.25350176870859,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 578.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 109.1089747430961,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": -2.8155207053447384
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.023281634339043,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 573.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 107.91932166809762,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": 0.1680079008205837
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.308213582276935,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 563.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 106.16000711507614,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": 1.3196085784855427
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.092708897122748,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 558.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 105.34847260725084,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": 1.3941470921570271
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.287672653485345,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 533.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 101.47781350478886,
   "end_elevation_m": 110.62164983153153,
   "min_gradient_pct": 1.7579603909488242
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.577272509441528,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 501.0,
   "end_distance_m": 601.0,
   "start_elevation_m": 96.83033023381054,
   "end_elevation_m": 113.40760274325207,
   "min_gradient_pct": 2.3180035644788575
  }
 ],
 "shape": {
  "ascent_concentration": 0.434,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 92.0,
  "shape_class": "sustained"
 },
 "length_m": 1714.9770716784628,
 "start_elevation_m": 45.79712496185299,
 "end_elevation_m": 176.33985942773427,
 "endpoint_gain_m": 130.54273446588127,
 "overall_gradient_pct": 7.611923017613172,
 "accumulated_ascent_m": 133.04223031436993,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.25350176870859,
   "start_distance_m": 578.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 580.5,
   "start_elevation_m": 109.1089747430961,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393151.8953566378,
    169286.3389580271
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_10m": {
   "gradient_pct": 27.023281634339043,
   "start_distance_m": 573.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 578.0,
   "start_elevation_m": 107.91932166809762,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393146.9381845322,
    169285.68593547295
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_20m": {
   "gradient_pct": 22.308213582276935,
   "start_distance_m": 563.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 573.0,
   "start_elevation_m": 106.16000711507614,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393139.32076464855,
    169279.71358345204
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_25m": {
   "gradient_pct": 21.092708897122748,
   "start_distance_m": 558.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 570.5,
   "start_elevation_m": 105.34847260725084,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393137.40909880836,
    169275.09409028266
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_50m": {
   "gradient_pct": 18.287672653485345,
   "start_distance_m": 533.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 558.0,
   "start_elevation_m": 101.47781350478886,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393127.8748737447,
    169251.9835205777
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_100m": {
   "gradient_pct": 16.577272509441528,
   "start_distance_m": 501.0,
   "end_distance_m": 601.0,
   "midpoint_distance_m": 551.0,
   "start_elevation_m": 96.83033023381054,
   "end_elevation_m": 113.40760274325207,
   "start_xy": [
    393111.21923654835,
    169225.30555550827
   ],
   "end_xy": [
    393174.8839291412,
    169286.83411886627
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.8155207053447384,
   "start_distance_m": 32.0,
   "end_distance_m": 37.0,
   "midpoint_distance_m": 34.5,
   "start_elevation_m": 47.484816992747064,
   "end_elevation_m": 47.34404095747983,
   "start_xy": [
    392692.7665760648,
    169025.79548281152
   ],
   "end_xy": [
    392696.59897884226,
    169029.0068193178
   ]
  },
  "min_10m": {
   "gradient_pct": 0.1680079008205837,
   "start_distance_m": 13.0,
   "end_distance_m": 23.0,
   "midpoint_distance_m": 18.0,
   "start_elevation_m": 46.57347506290134,
   "end_elevation_m": 46.590275852983396,
   "start_xy": [
    392679.17494394985,
    169012.63593067246
   ],
   "end_xy": [
    392685.867772332,
    169020.01564730695
   ]
  },
  "min_20m": {
   "gradient_pct": 1.3196085784855427,
   "start_distance_m": 1439.0,
   "end_distance_m": 1459.0,
   "midpoint_distance_m": 1449.0,
   "start_elevation_m": 167.7660570158494,
   "end_elevation_m": 168.02997873154652,
   "start_xy": [
    393923.15388331295,
    169098.2579869221
   ],
   "end_xy": [
    393939.48724723334,
    169086.7158388572
   ]
  },
  "min_25m": {
   "gradient_pct": 1.3941470921570271,
   "start_distance_m": 1439.0,
   "end_distance_m": 1464.0,
   "midpoint_distance_m": 1451.5,
   "start_elevation_m": 167.7660570158494,
   "end_elevation_m": 168.11459378888867,
   "start_xy": [
    393923.15388331295,
    169098.2579869221
   ],
   "end_xy": [
    393943.57025601476,
    169083.82983265544
   ]
  },
  "min_50m": {
   "gradient_pct": 1.7579603909488242,
   "start_distance_m": 1423.0,
   "end_distance_m": 1473.0,
   "midpoint_distance_m": 1448.0,
   "start_elevation_m": 167.41650279003446,
   "end_elevation_m": 168.29548298550887,
   "start_xy": [
    393910.0040263804,
    169107.36691779282
   ],
   "end_xy": [
    393950.9206478542,
    169078.63640090608
   ]
  },
  "min_100m": {
   "gradient_pct": 2.3180035644788575,
   "start_distance_m": 1419.0,
   "end_distance_m": 1519.0,
   "midpoint_distance_m": 1469.0,
   "start_elevation_m": 167.3236381529964,
   "end_elevation_m": 169.64164171747527,
   "start_xy": [
    393906.60434662586,
    169109.47456509198
   ],
   "end_xy": [
    393974.0428084116,
    169040.50682524062
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.60889472852173,
   "start_distance_m": 581.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 582.0,
   "start_elevation_m": 109.9294719369611,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393154.88639748533,
    169286.5200420043
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  },
  "max_3m": {
   "gradient_pct": 32.10090075376447,
   "start_distance_m": 580.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 581.5,
   "start_elevation_m": 109.6586228089186,
   "end_elevation_m": 110.62164983153153,
   "start_xy": [
    393153.88652440096,
    169286.50411239042
   ],
   "end_xy": [
    393156.8861557303,
    169286.55112249168
   ]
  }
 },
 "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": 0.036,
   "obstruction_max_height_m": 8.76,
   "flagged_windows_m": []
  },
  "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/ST9065.tif"
  ],
  "calculated_at": "2026-08-19T18:24:17+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": [
   "ST9065.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.9% over 200 m (Terrain 50), gain 100.1 m over 1005 m way. EXTENDED by graph walk: +2 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 (51.4221, -2.0966)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.4221, -2.0966)'"
 },
 "area": {
  "place": "Reybridge",
  "county": "Wiltshire"
 }
}