{
 "ocl_version": "0.1.0",
 "name": "Clynnog Fawr to Bwlch Mawr",
 "slug": "discovered-lane-53-0162-4-3446",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.12643209157011,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1951.0,
   "end_distance_m": 1953.0,
   "start_elevation_m": 208.76716595143236,
   "end_elevation_m": 209.34969459326376,
   "min_gradient_pct": -32.51396632023926
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 30.127045668006264,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1950.0,
   "end_distance_m": 1953.0,
   "start_elevation_m": 208.44588322322357,
   "end_elevation_m": 209.34969459326376,
   "min_gradient_pct": -32.12092886810941
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.03031812044469,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 898.0,
   "end_distance_m": 903.0,
   "start_elevation_m": 150.8547858747499,
   "end_elevation_m": 152.10630178077213,
   "min_gradient_pct": -23.14250059054757
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.31492602044358,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 896.0,
   "end_distance_m": 906.0,
   "start_elevation_m": 150.38764986236967,
   "end_elevation_m": 152.81914246441403,
   "min_gradient_pct": -21.36117339175655
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.129400558139537,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 895.0,
   "end_distance_m": 915.0,
   "start_elevation_m": 150.1569778003641,
   "end_elevation_m": 154.782857911992,
   "min_gradient_pct": -18.87239728360001
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.78370527872619,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 891.0,
   "end_distance_m": 916.0,
   "start_elevation_m": 149.30755242108927,
   "end_elevation_m": 155.00347874077082,
   "min_gradient_pct": -16.96661400014534
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.999013782024576,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 880.0,
   "end_distance_m": 930.0,
   "start_elevation_m": 147.42039123780071,
   "end_elevation_m": 157.419898128813,
   "min_gradient_pct": -13.373857619983767
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.57646500002403,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 426.0,
   "end_distance_m": 526.0,
   "start_elevation_m": 87.12773478755551,
   "end_elevation_m": 104.70419978757954,
   "min_gradient_pct": -8.66097767640639
  }
 ],
 "length_m": 3169.9941620572276,
 "start_elevation_m": 39.559233336304324,
 "end_elevation_m": 231.55765495071438,
 "endpoint_gain_m": 191.99842161441006,
 "overall_gradient_pct": 6.056743697275741,
 "accumulated_ascent_m": 225.48458894215534,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.03031812044469,
   "start_distance_m": 898.0,
   "end_distance_m": 903.0,
   "midpoint_distance_m": 900.5,
   "start_elevation_m": 150.8547858747499,
   "end_elevation_m": 152.10630178077213,
   "start_xy": [
    242489.85036017466,
    349671.18339925015
   ],
   "end_xy": [
    242491.91481805142,
    349666.64556085394
   ]
  },
  "max_10m": {
   "gradient_pct": 24.31492602044358,
   "start_distance_m": 896.0,
   "end_distance_m": 906.0,
   "midpoint_distance_m": 901.0,
   "start_elevation_m": 150.38764986236967,
   "end_elevation_m": 152.81914246441403,
   "start_xy": [
    242489.64835054553,
    349673.17317112396
   ],
   "end_xy": [
    242493.91456045967,
    349664.4673171355
   ]
  },
  "max_20m": {
   "gradient_pct": 23.129400558139537,
   "start_distance_m": 895.0,
   "end_distance_m": 915.0,
   "midpoint_distance_m": 905.0,
   "start_elevation_m": 150.1569778003641,
   "end_elevation_m": 154.782857911992,
   "start_xy": [
    242489.54734573097,
    349674.16805706086
   ],
   "end_xy": [
    242502.01486227335,
    349661.1054475535
   ]
  },
  "max_25m": {
   "gradient_pct": 22.78370527872619,
   "start_distance_m": 891.0,
   "end_distance_m": 916.0,
   "midpoint_distance_m": 903.5,
   "start_elevation_m": 149.30755242108927,
   "end_elevation_m": 155.00347874077082,
   "start_xy": [
    242489.14332647272,
    349678.1476008085
   ],
   "end_xy": [
    242502.98563446902,
    349660.8654447534
   ]
  },
  "max_50m": {
   "gradient_pct": 19.999013782024576,
   "start_distance_m": 880.0,
   "end_distance_m": 930.0,
   "midpoint_distance_m": 905.0,
   "start_elevation_m": 147.42039123780071,
   "end_elevation_m": 157.419898128813,
   "start_xy": [
    242488.12665202975,
    349689.10006041493
   ],
   "end_xy": [
    242516.64887915002,
    349657.81606346084
   ]
  },
  "max_100m": {
   "gradient_pct": 17.57646500002403,
   "start_distance_m": 426.0,
   "end_distance_m": 526.0,
   "midpoint_distance_m": 476.0,
   "start_elevation_m": 87.12773478755551,
   "end_elevation_m": 104.70419978757954,
   "start_xy": [
    242190.32440437638,
    349828.44509091874
   ],
   "end_xy": [
    242285.5569942415,
    349830.8908545182
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -23.14250059054757,
   "start_distance_m": 2707.0,
   "end_distance_m": 2712.0,
   "midpoint_distance_m": 2709.5,
   "start_elevation_m": 217.23917339464234,
   "end_elevation_m": 216.08204836511496,
   "start_xy": [
    243451.6308711545,
    348506.3981859262
   ],
   "end_xy": [
    243455.2429606521,
    348502.9618818621
   ]
  },
  "min_10m": {
   "gradient_pct": -21.36117339175655,
   "start_distance_m": 2707.0,
   "end_distance_m": 2717.0,
   "midpoint_distance_m": 2712.0,
   "start_elevation_m": 217.23917339464234,
   "end_elevation_m": 215.10305605546668,
   "start_xy": [
    243451.6308711545,
    348506.3981859262
   ],
   "end_xy": [
    243458.6724005609,
    348499.32334617974
   ]
  },
  "min_20m": {
   "gradient_pct": -18.87239728360001,
   "start_distance_m": 2707.0,
   "end_distance_m": 2727.0,
   "midpoint_distance_m": 2717.0,
   "start_elevation_m": 217.23917339464234,
   "end_elevation_m": 213.46469393792233,
   "start_xy": [
    243451.6308711545,
    348506.3981859262
   ],
   "end_xy": [
    243465.5312803785,
    348492.04627481493
   ]
  },
  "min_25m": {
   "gradient_pct": -16.96661400014534,
   "start_distance_m": 2707.0,
   "end_distance_m": 2732.0,
   "midpoint_distance_m": 2719.5,
   "start_elevation_m": 217.23917339464234,
   "end_elevation_m": 212.997519894606,
   "start_xy": [
    243451.6308711545,
    348506.3981859262
   ],
   "end_xy": [
    243468.96616962575,
    348488.41291345505
   ]
  },
  "min_50m": {
   "gradient_pct": -13.373857619983767,
   "start_distance_m": 2692.0,
   "end_distance_m": 2742.0,
   "midpoint_distance_m": 2717.0,
   "start_elevation_m": 218.5923710807572,
   "end_elevation_m": 211.90544227076532,
   "start_xy": [
    243439.72743250226,
    348515.52551566996
   ],
   "end_xy": [
    243475.87861870063,
    348481.18670782645
   ]
  },
  "min_100m": {
   "gradient_pct": -8.66097767640639,
   "start_distance_m": 2642.0,
   "end_distance_m": 2742.0,
   "midpoint_distance_m": 2692.0,
   "start_elevation_m": 220.5664199471717,
   "end_elevation_m": 211.90544227076532,
   "start_xy": [
    243397.90753406982,
    348542.8942061384
   ],
   "end_xy": [
    243475.87861870063,
    348481.18670782645
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.12643209157011,
   "start_distance_m": 1951.0,
   "end_distance_m": 1953.0,
   "midpoint_distance_m": 1952.0,
   "start_elevation_m": 208.76716595143236,
   "end_elevation_m": 209.34969459326376,
   "start_xy": [
    242877.36566988594,
    348959.409766318
   ],
   "end_xy": [
    242877.30788760856,
    348957.4106011901
   ]
  },
  "max_3m": {
   "gradient_pct": 30.127045668006264,
   "start_distance_m": 1950.0,
   "end_distance_m": 1953.0,
   "midpoint_distance_m": 1951.5,
   "start_elevation_m": 208.44588322322357,
   "end_elevation_m": 209.34969459326376,
   "start_xy": [
    242877.39456102464,
    348960.4093488819
   ],
   "end_xy": [
    242877.30788760856,
    348957.4106011901
   ]
  }
 },
 "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": 0.18,
   "obstruction_max_height_m": 14.77,
   "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/wales/dtm_1m/wg_del_11_241348_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_242348_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_242349_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_243348_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_243349_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_32_241349_20220420dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:09:43+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
   "wg_del_11_241348_20210302dtm.tif",
   "wg_del_11_242348_20210302dtm.tif",
   "wg_del_11_242349_20210302dtm.tif",
   "wg_del_11_243348_20210302dtm.tif",
   "wg_del_11_243349_20210302dtm.tif",
   "wg_del_32_241349_20220420dtm.tif"
  ],
  "elevation_capture_dates": [
   "02-03-2021",
   "20-04-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.8% over 200 m (Terrain 50), gain 111.0 m over 2501 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 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-53-0130-4-3438 ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (53.0162, -4.3446)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (53.0162, -4.3446)'"
 },
 "area": {
  "place": "Capel Uchaf",
  "county": "Gwynedd - Gwynedd"
 },
 "reported_claims": [],
 "confidence": "A",
 "shape": {
  "ascent_concentration": 0.484,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 358.0,
  "shape_class": "stepped"
 }
}