{
 "ocl_version": "0.1.0",
 "name": "Lane near Coombe",
 "slug": "discovered-lane-50-6340-3-6683",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.553956181773174,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1138.0,
   "end_distance_m": 1140.0,
   "start_elevation_m": 201.53482181992592,
   "end_elevation_m": 202.2859009435614,
   "min_gradient_pct": -45.80155136512474
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.31817632139568,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1036.0,
   "end_distance_m": 1039.0,
   "start_elevation_m": 189.13115138031316,
   "end_elevation_m": 190.07069666995503,
   "min_gradient_pct": -43.51009585086558
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.84407679389608,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1116.0,
   "end_distance_m": 1121.0,
   "start_elevation_m": 197.78452920930945,
   "end_elevation_m": 199.12673304900426,
   "min_gradient_pct": -38.34454526080776
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.630696647200296,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2448.0,
   "end_distance_m": 2458.0,
   "start_elevation_m": 225.651386839072,
   "end_elevation_m": 228.01445650379202,
   "min_gradient_pct": -27.065401955294703
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.927783012768685,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2448.0,
   "end_distance_m": 2468.0,
   "start_elevation_m": 225.651386839072,
   "end_elevation_m": 230.23694344162573,
   "min_gradient_pct": -23.016373264099315
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.320172550564394,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2447.0,
   "end_distance_m": 2472.0,
   "start_elevation_m": 225.50524287871772,
   "end_elevation_m": 231.08528601635882,
   "min_gradient_pct": -22.02513466003211
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.99106995943771,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2433.0,
   "end_distance_m": 2483.0,
   "start_elevation_m": 222.92241051152598,
   "end_elevation_m": 233.41794549124484,
   "min_gradient_pct": -20.44115552910972
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.486354786762746,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2397.0,
   "end_distance_m": 2497.0,
   "start_elevation_m": 217.2967083013036,
   "end_elevation_m": 235.78306308806634,
   "min_gradient_pct": -19.073003254510468
  }
 ],
 "shape": {
  "ascent_concentration": 0.414,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 248.0,
  "shape_class": "sustained"
 },
 "length_m": 2867.9999999999877,
 "start_elevation_m": 95.69908315856993,
 "end_elevation_m": 261.3006592092402,
 "endpoint_gain_m": 165.6015760506703,
 "overall_gradient_pct": 5.774113530358124,
 "accumulated_ascent_m": 216.76223647417342,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.84407679389608,
   "start_distance_m": 1116.0,
   "end_distance_m": 1121.0,
   "midpoint_distance_m": 1118.5,
   "start_elevation_m": 197.78452920930945,
   "end_elevation_m": 199.12673304900426,
   "start_xy": [
    283191.30297583545,
    83368.55038030715
   ],
   "end_xy": [
    283186.31328967924,
    83368.8713601809
   ]
  },
  "max_10m": {
   "gradient_pct": 23.630696647200296,
   "start_distance_m": 2448.0,
   "end_distance_m": 2458.0,
   "midpoint_distance_m": 2453.0,
   "start_elevation_m": 225.651386839072,
   "end_elevation_m": 228.01445650379202,
   "start_xy": [
    282033.95123720623,
    82824.22831347419
   ],
   "end_xy": [
    282026.05888859177,
    82818.0873999941
   ]
  },
  "max_20m": {
   "gradient_pct": 22.927783012768685,
   "start_distance_m": 2448.0,
   "end_distance_m": 2468.0,
   "midpoint_distance_m": 2458.0,
   "start_elevation_m": 225.651386839072,
   "end_elevation_m": 230.23694344162573,
   "start_xy": [
    282033.95123720623,
    82824.22831347419
   ],
   "end_xy": [
    282018.16650978965,
    82811.9465253302
   ]
  },
  "max_25m": {
   "gradient_pct": 22.320172550564394,
   "start_distance_m": 2447.0,
   "end_distance_m": 2472.0,
   "midpoint_distance_m": 2459.5,
   "start_elevation_m": 225.50524287871772,
   "end_elevation_m": 231.08528601635882,
   "start_xy": [
    282034.74063149234,
    82824.84219991927
   ],
   "end_xy": [
    282015.1987759336,
    82809.2928949942
   ]
  },
  "max_50m": {
   "gradient_pct": 20.99106995943771,
   "start_distance_m": 2433.0,
   "end_distance_m": 2483.0,
   "midpoint_distance_m": 2458.0,
   "start_elevation_m": 222.92241051152598,
   "end_elevation_m": 233.41794549124484,
   "start_xy": [
    282044.51591172593,
    82834.71917824383
   ],
   "end_xy": [
    282008.6662022237,
    82800.44272814515
   ]
  },
  "max_100m": {
   "gradient_pct": 18.486354786762746,
   "start_distance_m": 2397.0,
   "end_distance_m": 2497.0,
   "midpoint_distance_m": 2447.0,
   "start_elevation_m": 217.2967083013036,
   "end_elevation_m": 235.78306308806634,
   "start_xy": [
    282068.68710771296,
    82861.25449050168
   ],
   "end_xy": [
    282000.35185351915,
    82789.17900013964
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -38.34454526080776,
   "start_distance_m": 2235.0,
   "end_distance_m": 2240.0,
   "midpoint_distance_m": 2237.5,
   "start_elevation_m": 223.08760997594655,
   "end_elevation_m": 221.17038271290616,
   "start_xy": [
    282179.75730871334,
    82964.77562040131
   ],
   "end_xy": [
    282175.28016335977,
    82962.55004666881
   ]
  },
  "min_10m": {
   "gradient_pct": -27.065401955294703,
   "start_distance_m": 2234.0,
   "end_distance_m": 2244.0,
   "midpoint_distance_m": 2239.0,
   "start_elevation_m": 223.29833487880947,
   "end_elevation_m": 220.59179468328,
   "start_xy": [
    282180.65845191735,
    82965.20914170945
   ],
   "end_xy": [
    282171.70957372175,
    82960.7470255028
   ]
  },
  "min_20m": {
   "gradient_pct": -23.016373264099315,
   "start_distance_m": 2219.0,
   "end_distance_m": 2239.0,
   "midpoint_distance_m": 2229.0,
   "start_elevation_m": 226.00263700612942,
   "end_elevation_m": 221.39936235330956,
   "start_xy": [
    282194.17664728063,
    82971.70978348481
   ],
   "end_xy": [
    282176.17300423543,
    82963.00041870766
   ]
  },
  "min_25m": {
   "gradient_pct": -22.02513466003211,
   "start_distance_m": 2175.0,
   "end_distance_m": 2200.0,
   "midpoint_distance_m": 2187.5,
   "start_elevation_m": 234.76341751377953,
   "end_elevation_m": 229.2571338487715,
   "start_xy": [
    282233.8305658097,
    82990.77719644348
   ],
   "end_xy": [
    282211.3000593038,
    82979.94317037534
   ]
  },
  "min_50m": {
   "gradient_pct": -20.44115552910972,
   "start_distance_m": 2190.0,
   "end_distance_m": 2240.0,
   "midpoint_distance_m": 2215.0,
   "start_elevation_m": 231.39096047746102,
   "end_elevation_m": 221.17038271290616,
   "start_xy": [
    282220.3123335072,
    82984.27663234419
   ],
   "end_xy": [
    282175.28016335977,
    82962.55004666881
   ]
  },
  "min_100m": {
   "gradient_pct": -19.073003254510468,
   "start_distance_m": 2175.0,
   "end_distance_m": 2275.0,
   "midpoint_distance_m": 2225.0,
   "start_elevation_m": 234.76341751377953,
   "end_elevation_m": 215.69041425926906,
   "start_xy": [
    282233.8305658097,
    82990.77719644348
   ],
   "end_xy": [
    282143.8663696811,
    82947.7202624907
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.553956181773174,
   "start_distance_m": 1138.0,
   "end_distance_m": 1140.0,
   "midpoint_distance_m": 1139.0,
   "start_elevation_m": 201.53482181992592,
   "end_elevation_m": 202.2859009435614,
   "start_xy": [
    283169.34839946317,
    83369.96335314063
   ],
   "end_xy": [
    283167.3525636182,
    83370.09234261366
   ]
  },
  "max_3m": {
   "gradient_pct": 31.31817632139568,
   "start_distance_m": 1036.0,
   "end_distance_m": 1039.0,
   "midpoint_distance_m": 1037.5,
   "start_elevation_m": 189.13115138031316,
   "end_elevation_m": 190.07069666995503,
   "start_xy": [
    283271.17277752905,
    83364.02157469824
   ],
   "end_xy": [
    283268.17657909595,
    83364.17254814149
   ]
  }
 },
 "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": 0.021,
   "obstruction_max_height_m": 10.13,
   "flagged_windows_m": []
  },
  "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/SX8080.tif"
  ],
  "calculated_at": "2026-08-19T18:15:24+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": [
   "SX8080.tif"
  ],
  "route_summit_trim_m": 513.6,
  "route_summit_trim_loss_m": 12.0,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.1% over 200 m (Terrain 50), gain 40.5 m over 2111 m way. EXTENDED by graph walk: +3 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 (50.6340, -3.6683)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.6340, -3.6683)'"
 },
 "area": {
  "place": "Coombe",
  "county": "Devon"
 }
}