{
 "ocl_version": "0.1.0",
 "name": "Brongwyn to Capel Tygwydd",
 "slug": "discovered-lane-52-0617-4-5038",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.87465502471875,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 120.0,
   "end_distance_m": 122.0,
   "start_elevation_m": 92.26945062823985,
   "end_elevation_m": 93.22694372873423,
   "min_gradient_pct": -30.388593119357665
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.923867277033914,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 134.0,
   "end_distance_m": 137.0,
   "start_elevation_m": 95.16817579031962,
   "end_elevation_m": 96.48589180863064,
   "min_gradient_pct": -23.45942866713055
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.900644313230714,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 169.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 101.86463654975384,
   "end_elevation_m": 103.65966876541538,
   "min_gradient_pct": -19.870910357024343
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.3371509464219,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 164.0,
   "end_distance_m": 174.0,
   "start_elevation_m": 100.62595367077319,
   "end_elevation_m": 103.65966876541538,
   "min_gradient_pct": -14.388181029849818
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.016148859990352,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 160.0,
   "end_distance_m": 180.0,
   "start_elevation_m": 99.72987359275669,
   "end_elevation_m": 105.13310336475476,
   "min_gradient_pct": -11.776198068916841
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.02001083270909,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 155.0,
   "end_distance_m": 180.0,
   "start_elevation_m": 98.62810065657749,
   "end_elevation_m": 105.13310336475476,
   "min_gradient_pct": -11.849448191563113
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.52793747392303,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 87.0,
   "end_distance_m": 137.0,
   "start_elevation_m": 85.22192307166912,
   "end_elevation_m": 96.48589180863064,
   "min_gradient_pct": -9.316792820299668
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.116467126128796,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 91.0,
   "end_distance_m": 191.0,
   "start_elevation_m": 85.89542799082643,
   "end_elevation_m": 107.01189511695523,
   "min_gradient_pct": -6.738894022822351
  }
 ],
 "length_m": 1287.915756377968,
 "start_elevation_m": 73.01299659476923,
 "end_elevation_m": 136.8458006606445,
 "endpoint_gain_m": 63.832804065875266,
 "overall_gradient_pct": 4.956287222185524,
 "accumulated_ascent_m": 79.60460036305373,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.900644313230714,
   "start_distance_m": 169.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 171.5,
   "start_elevation_m": 101.86463654975384,
   "end_elevation_m": 103.65966876541538,
   "start_xy": [
    228542.08409527136,
    243428.4743281084
   ],
   "end_xy": [
    228538.301829816,
    243425.204088358
   ]
  },
  "max_10m": {
   "gradient_pct": 30.3371509464219,
   "start_distance_m": 164.0,
   "end_distance_m": 174.0,
   "midpoint_distance_m": 169.0,
   "start_elevation_m": 100.62595367077319,
   "end_elevation_m": 103.65966876541538,
   "start_xy": [
    228545.64804975002,
    243431.894837633
   ],
   "end_xy": [
    228538.301829816,
    243425.204088358
   ]
  },
  "max_20m": {
   "gradient_pct": 27.016148859990352,
   "start_distance_m": 160.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 170.0,
   "start_elevation_m": 99.72987359275669,
   "end_elevation_m": 105.13310336475476,
   "start_xy": [
    228547.01147323646,
    243435.65529989137
   ],
   "end_xy": [
    228533.76311126954,
    243421.27980065753
   ]
  },
  "max_25m": {
   "gradient_pct": 26.02001083270909,
   "start_distance_m": 155.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 167.5,
   "start_elevation_m": 98.62810065657749,
   "end_elevation_m": 105.13310336475476,
   "start_xy": [
    228548.71575259446,
    243440.35587771435
   ],
   "end_xy": [
    228533.76311126954,
    243421.27980065753
   ]
  },
  "max_50m": {
   "gradient_pct": 22.52793747392303,
   "start_distance_m": 87.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 112.0,
   "start_elevation_m": 85.22192307166912,
   "end_elevation_m": 96.48589180863064,
   "start_xy": [
    228571.11506625684,
    243504.42180793398
   ],
   "end_xy": [
    228554.8511582834,
    243457.27795787703
   ]
  },
  "max_100m": {
   "gradient_pct": 21.116467126128796,
   "start_distance_m": 91.0,
   "end_distance_m": 191.0,
   "midpoint_distance_m": 141.0,
   "start_elevation_m": 85.89542799082643,
   "end_elevation_m": 107.01189511695523,
   "start_xy": [
    228570.53052837728,
    243500.52327384835
   ],
   "end_xy": [
    228525.44212726768,
    243414.08527320667
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -19.870910357024343,
   "start_distance_m": 760.0,
   "end_distance_m": 765.0,
   "midpoint_distance_m": 762.5,
   "start_elevation_m": 121.79380677803032,
   "end_elevation_m": 120.8002612601791,
   "start_xy": [
    228083.96394562285,
    243093.9916667201
   ],
   "end_xy": [
    228080.67153894267,
    243090.22868143546
   ]
  },
  "min_10m": {
   "gradient_pct": -14.388181029849818,
   "start_distance_m": 758.0,
   "end_distance_m": 768.0,
   "midpoint_distance_m": 763.0,
   "start_elevation_m": 122.03855387894852,
   "end_elevation_m": 120.59973577596354,
   "start_xy": [
    228085.2809082949,
    243095.49686083398
   ],
   "end_xy": [
    228078.69609493457,
    243087.9708902647
   ]
  },
  "min_20m": {
   "gradient_pct": -11.776198068916841,
   "start_distance_m": 759.0,
   "end_distance_m": 779.0,
   "midpoint_distance_m": 769.0,
   "start_elevation_m": 121.88953357174435,
   "end_elevation_m": 119.53429395796098,
   "start_xy": [
    228084.62242695887,
    243094.74426377704
   ],
   "end_xy": [
    228071.45280023824,
    243079.69232263847
   ]
  },
  "min_25m": {
   "gradient_pct": -11.849448191563113,
   "start_distance_m": 758.0,
   "end_distance_m": 783.0,
   "midpoint_distance_m": 770.5,
   "start_elevation_m": 122.03855387894852,
   "end_elevation_m": 119.07619183105774,
   "start_xy": [
    228085.2809082949,
    243095.49686083398
   ],
   "end_xy": [
    228068.8188748941,
    243076.68193441076
   ]
  },
  "min_50m": {
   "gradient_pct": -9.316792820299668,
   "start_distance_m": 736.0,
   "end_distance_m": 786.0,
   "midpoint_distance_m": 761.0,
   "start_elevation_m": 123.47294627902939,
   "end_elevation_m": 118.81454986887955,
   "start_xy": [
    228099.7674976876,
    243112.0539960864
   ],
   "end_xy": [
    228066.84343088602,
    243074.42414323997
   ]
  },
  "min_100m": {
   "gradient_pct": -6.738894022822351,
   "start_distance_m": 689.0,
   "end_distance_m": 789.0,
   "midpoint_distance_m": 739.0,
   "start_elevation_m": 125.34450153905202,
   "end_elevation_m": 118.60560751622967,
   "start_xy": [
    228131.18790076877,
    243147.0062752197
   ],
   "end_xy": [
    228064.8679868779,
    243072.16635206918
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.87465502471875,
   "start_distance_m": 120.0,
   "end_distance_m": 122.0,
   "midpoint_distance_m": 121.0,
   "start_elevation_m": 92.26945062823985,
   "end_elevation_m": 93.22694372873423,
   "start_xy": [
    228560.6457081007,
    243473.25992247512
   ],
   "end_xy": [
    228559.9639963575,
    243471.37969134594
   ]
  },
  "max_3m": {
   "gradient_pct": 43.923867277033914,
   "start_distance_m": 134.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 135.5,
   "start_elevation_m": 95.16817579031962,
   "end_elevation_m": 96.48589180863064,
   "start_xy": [
    228555.87372589821,
    243460.0983045708
   ],
   "end_xy": [
    228554.8511582834,
    243457.27795787703
   ]
  }
 },
 "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": 0.313,
   "obstruction_max_height_m": 22.07,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "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_14_227243_20210321dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_14_228243_20210321dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:07:50+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_14_227243_20210321dtm.tif",
   "wg_del_14_228243_20210321dtm.tif"
  ],
  "elevation_capture_dates": [
   "21-03-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.7% over 200 m (Terrain 50), gain 42.9 m over 794 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. ADOPTED (notable slice 2026-08-11): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.0617, -4.5038)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.0617, -4.5038)'"
 },
 "area": {
  "place": "Troed-y-rhiw-Si\u00f4n",
  "county": "Sir Ceredigion - Ceredigion"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.61,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 82.0,
  "shape_class": "stepped"
 }
}