{
 "ocl_version": "0.1.0",
 "name": "Bownham to Bagpath",
 "slug": "discovered-lane-51-7188-2-2020",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.542237475812954,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1134.0,
   "end_distance_m": 1136.0,
   "start_elevation_m": 170.08243392368956,
   "end_elevation_m": 170.77327867320582,
   "min_gradient_pct": -11.07019568952694
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.742651401778705,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1134.0,
   "end_distance_m": 1137.0,
   "start_elevation_m": 170.08243392368956,
   "end_elevation_m": 171.03471346574293,
   "min_gradient_pct": -6.684609170084362
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.152973973651115,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1133.0,
   "end_distance_m": 1138.0,
   "start_elevation_m": 169.8876874559352,
   "end_elevation_m": 171.19533615461776,
   "min_gradient_pct": -5.857557954562367
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.30304765333588,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 26.0,
   "end_distance_m": 36.0,
   "start_elevation_m": 104.05494028972977,
   "end_elevation_m": 106.48524505506336,
   "min_gradient_pct": -5.614742013293892
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.942088372611806,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 18.0,
   "end_distance_m": 38.0,
   "start_elevation_m": 102.33909733390229,
   "end_elevation_m": 106.92751500842465,
   "min_gradient_pct": -4.971399642718097
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.43184422416755,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 16.0,
   "end_distance_m": 41.0,
   "start_elevation_m": 101.93082149126809,
   "end_elevation_m": 107.53878254730998,
   "min_gradient_pct": -4.7456814111058065
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.390592432812838,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 101.38696822853001,
   "end_elevation_m": 111.58226444493643,
   "min_gradient_pct": -3.6245890475087776
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.53894962573736,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 11.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 101.02569363523673,
   "end_elevation_m": 120.5646432609741,
   "min_gradient_pct": -1.4685062570057994
  }
 ],
 "shape": {
  "ascent_concentration": 0.562,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 148.0,
  "shape_class": "stepped"
 },
 "length_m": 1294.239796645133,
 "start_elevation_m": 99.29815620056289,
 "end_elevation_m": 179.99024319763174,
 "endpoint_gain_m": 80.69208699706886,
 "overall_gradient_pct": 6.23470914789014,
 "accumulated_ascent_m": 84.42443456395378,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.152973973651115,
   "start_distance_m": 1133.0,
   "end_distance_m": 1138.0,
   "midpoint_distance_m": 1135.5,
   "start_elevation_m": 169.8876874559352,
   "end_elevation_m": 171.19533615461776,
   "start_xy": [
    385512.1367801577,
    202907.11772058252
   ],
   "end_xy": [
    385507.4325110761,
    202908.81059252637
   ]
  },
  "max_10m": {
   "gradient_pct": 24.30304765333588,
   "start_distance_m": 26.0,
   "end_distance_m": 36.0,
   "midpoint_distance_m": 31.0,
   "start_elevation_m": 104.05494028972977,
   "end_elevation_m": 106.48524505506336,
   "start_xy": [
    386295.07013832097,
    202172.40352378457
   ],
   "end_xy": [
    386285.118861525,
    202173.38752728817
   ]
  },
  "max_20m": {
   "gradient_pct": 22.942088372611806,
   "start_distance_m": 18.0,
   "end_distance_m": 38.0,
   "midpoint_distance_m": 28.0,
   "start_elevation_m": 102.33909733390229,
   "end_elevation_m": 106.92751500842465,
   "start_xy": [
    386303.0384774803,
    202171.6924934782
   ],
   "end_xy": [
    386283.12929917773,
    202173.59159013536
   ]
  },
  "max_25m": {
   "gradient_pct": 22.43184422416755,
   "start_distance_m": 16.0,
   "end_distance_m": 41.0,
   "midpoint_distance_m": 28.5,
   "start_elevation_m": 101.93082149126809,
   "end_elevation_m": 107.53878254730998,
   "start_xy": [
    386305.03054023127,
    202171.5144878709
   ],
   "end_xy": [
    386280.14505162294,
    202173.89861576163
   ]
  },
  "max_50m": {
   "gradient_pct": 20.390592432812838,
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 38.0,
   "start_elevation_m": 101.38696822853001,
   "end_elevation_m": 111.58226444493643,
   "start_xy": [
    386308.01863435766,
    202171.24747946
   ],
   "end_xy": [
    386258.26983991836,
    202176.2296716958
   ]
  },
  "max_100m": {
   "gradient_pct": 19.53894962573736,
   "start_distance_m": 11.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 61.0,
   "start_elevation_m": 101.02569363523673,
   "end_elevation_m": 120.5646432609741,
   "start_xy": [
    386310.01069710864,
    202171.06947385272
   ],
   "end_xy": [
    386212.1031277258,
    202188.09501123734
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.857557954562367,
   "start_distance_m": 1007.0,
   "end_distance_m": 1012.0,
   "midpoint_distance_m": 1009.5,
   "start_elevation_m": 166.8419997191025,
   "end_elevation_m": 166.54912182137437,
   "start_xy": [
    385605.4072812487,
    202830.5240685907
   ],
   "end_xy": [
    385603.4824095333,
    202835.13870496186
   ]
  },
  "min_10m": {
   "gradient_pct": -5.614742013293892,
   "start_distance_m": 1004.0,
   "end_distance_m": 1014.0,
   "midpoint_distance_m": 1009.0,
   "start_elevation_m": 167.00314860279803,
   "end_elevation_m": 166.44167440146865,
   "start_xy": [
    385606.56337927846,
    202827.75577741634
   ],
   "end_xy": [
    385602.7120851171,
    202836.9844026863
   ]
  },
  "min_20m": {
   "gradient_pct": -4.971399642718097,
   "start_distance_m": 998.0,
   "end_distance_m": 1018.0,
   "midpoint_distance_m": 1008.0,
   "start_elevation_m": 167.255390904014,
   "end_elevation_m": 166.2611109754704,
   "start_xy": [
    385608.8732213802,
    202822.21821211962
   ],
   "end_xy": [
    385601.1714004004,
    202840.6757829362
   ]
  },
  "min_25m": {
   "gradient_pct": -4.7456814111058065,
   "start_distance_m": 995.0,
   "end_distance_m": 1020.0,
   "midpoint_distance_m": 1007.5,
   "start_elevation_m": 167.37311329099327,
   "end_elevation_m": 166.18669293821682,
   "start_xy": [
    385610.0292914655,
    202819.4499092677
   ],
   "end_xy": [
    385600.4011044118,
    202842.52149253996
   ]
  },
  "min_50m": {
   "gradient_pct": -3.6245890475087776,
   "start_distance_m": 984.0,
   "end_distance_m": 1034.0,
   "midpoint_distance_m": 1009.0,
   "start_elevation_m": 167.64835097895752,
   "end_elevation_m": 165.83605645520313,
   "start_xy": [
    385614.2652202095,
    202809.29821492633
   ],
   "end_xy": [
    385593.278564441,
    202854.5481078083
   ]
  },
  "min_100m": {
   "gradient_pct": -1.4685062570057994,
   "start_distance_m": 983.0,
   "end_distance_m": 1083.0,
   "midpoint_distance_m": 1033.0,
   "start_elevation_m": 167.6593798286649,
   "end_elevation_m": 166.1908735716591,
   "start_xy": [
    385614.65019056795,
    202808.37528598914
   ],
   "end_xy": [
    385558.33053902315,
    202888.0975332258
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.542237475812954,
   "start_distance_m": 1134.0,
   "end_distance_m": 1136.0,
   "midpoint_distance_m": 1135.0,
   "start_elevation_m": 170.08243392368956,
   "end_elevation_m": 170.77327867320582,
   "start_xy": [
    385511.20406279893,
    202907.47828253784
   ],
   "end_xy": [
    385509.3197740175,
    202908.14859681888
   ]
  },
  "max_3m": {
   "gradient_pct": 31.742651401778705,
   "start_distance_m": 1134.0,
   "end_distance_m": 1137.0,
   "midpoint_distance_m": 1135.5,
   "start_elevation_m": 170.08243392368956,
   "end_elevation_m": 171.03471346574293,
   "start_xy": [
    385511.20406279893,
    202907.47828253784
   ],
   "end_xy": [
    385508.3762045572,
    202908.4797714953
   ]
  }
 },
 "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": 0.029,
   "obstruction_max_height_m": 6.27,
   "flagged_windows_m": [
    2,
    3,
    5
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/SO8500.tif"
  ],
  "calculated_at": "2026-08-19T18:24:25+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": [
   "SO8500.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.0% over 200 m (Terrain 50), gain 59.1 m over 595 m way. EXTENDED by graph walk: +0 segment(s) at base, +3 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-51-7192-2-2011 ADOPTED (England launch slice 2026-08-16): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.7188, -2.2020)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.7188, -2.2020)'"
 },
 "area": {
  "place": "Bownham",
  "county": "Gloucestershire"
 }
}