{
 "ocl_version": "0.1.0",
 "name": "The Hendre to Pen-y-lan",
 "slug": "discovered-lane-51-8323-2-8027",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 45.083395252554226,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 587.0,
   "end_distance_m": 589.0,
   "start_elevation_m": 80.50425221281586,
   "end_elevation_m": 81.40592011786694,
   "min_gradient_pct": -37.288441488789914,
   "suppressed_max_gradient_pct": 56.91062474212174,
   "suppressed_location_m": [
    2270.0,
    2272.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.57323079771993,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 586.0,
   "end_distance_m": 589.0,
   "start_elevation_m": 80.12872319393534,
   "end_elevation_m": 81.40592011786694,
   "min_gradient_pct": -24.14619540934145,
   "suppressed_max_gradient_pct": 49.198587997455924,
   "suppressed_location_m": [
    2269.0,
    2272.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 39.022002575814554,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 584.0,
   "end_distance_m": 589.0,
   "start_elevation_m": 79.45481998907621,
   "end_elevation_m": 81.40592011786694,
   "min_gradient_pct": -13.175883354905125,
   "suppressed_max_gradient_pct": 47.65589154298823,
   "suppressed_location_m": [
    2267.0,
    2272.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.967012794351206,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2196.0,
   "end_distance_m": 2206.0,
   "start_elevation_m": 134.11217520694973,
   "end_elevation_m": 137.00887648638485,
   "min_gradient_pct": -10.51577990994005,
   "suppressed_max_gradient_pct": 31.466888337621413,
   "suppressed_location_m": [
    2267.0,
    2277.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.041285565979223,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2186.0,
   "end_distance_m": 2206.0,
   "start_elevation_m": 131.600619373189,
   "end_elevation_m": 137.00887648638485,
   "min_gradient_pct": -7.719758082660562
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.46841422163709,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2187.0,
   "end_distance_m": 2212.0,
   "start_elevation_m": 131.8269808746316,
   "end_elevation_m": 138.44408443004087,
   "min_gradient_pct": -7.47597685414604
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.15960046507891,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2164.0,
   "end_distance_m": 2214.0,
   "start_elevation_m": 127.23878014540021,
   "end_elevation_m": 138.81858037793967,
   "min_gradient_pct": -6.936839674642783
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.13653491028147,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 2118.0,
   "end_distance_m": 2218.0,
   "start_elevation_m": 120.15276158820755,
   "end_elevation_m": 139.28929649848902,
   "min_gradient_pct": -6.473122743461488,
   "suppressed_max_gradient_pct": 19.595224271690114,
   "suppressed_location_m": [
    2172.0,
    2272.0
   ]
  }
 ],
 "length_m": 2446.6563955441925,
 "start_elevation_m": 54.17656602117975,
 "end_elevation_m": 156.36879213049147,
 "endpoint_gain_m": 102.19222610931172,
 "overall_gradient_pct": 4.17681151695115,
 "accumulated_ascent_m": 136.82751105217557,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 39.022002575814554,
   "start_distance_m": 584.0,
   "end_distance_m": 589.0,
   "midpoint_distance_m": 586.5,
   "start_elevation_m": 79.45481998907621,
   "end_elevation_m": 81.40592011786694,
   "start_xy": [
    345115.4493881187,
    214731.22636217123
   ],
   "end_xy": [
    345110.45690056076,
    214730.95237680027
   ]
  },
  "max_10m": {
   "gradient_pct": 28.967012794351206,
   "start_distance_m": 2196.0,
   "end_distance_m": 2206.0,
   "midpoint_distance_m": 2201.0,
   "start_elevation_m": 134.11217520694973,
   "end_elevation_m": 137.00887648638485,
   "start_xy": [
    344355.11869090947,
    215842.87038364992
   ],
   "end_xy": [
    344357.9960339588,
    215852.4474863943
   ]
  },
  "max_20m": {
   "gradient_pct": 27.041285565979223,
   "start_distance_m": 2186.0,
   "end_distance_m": 2206.0,
   "midpoint_distance_m": 2196.0,
   "start_elevation_m": 131.600619373189,
   "end_elevation_m": 137.00887648638485,
   "start_xy": [
    344352.24134786014,
    215833.29328090555
   ],
   "end_xy": [
    344357.9960339588,
    215852.4474863943
   ]
  },
  "max_25m": {
   "gradient_pct": 26.46841422163709,
   "start_distance_m": 2187.0,
   "end_distance_m": 2212.0,
   "midpoint_distance_m": 2199.5,
   "start_elevation_m": 131.8269808746316,
   "end_elevation_m": 138.44408443004087,
   "start_xy": [
    344352.52908216504,
    215834.25099118
   ],
   "end_xy": [
    344359.7224397884,
    215858.1937480409
   ]
  },
  "max_50m": {
   "gradient_pct": 23.15960046507891,
   "start_distance_m": 2164.0,
   "end_distance_m": 2214.0,
   "midpoint_distance_m": 2189.0,
   "start_elevation_m": 127.23878014540021,
   "end_elevation_m": 138.81858037793967,
   "start_xy": [
    344345.7289309107,
    215812.29516252692
   ],
   "end_xy": [
    344360.29790839826,
    215860.10916858978
   ]
  },
  "max_100m": {
   "gradient_pct": 19.13653491028147,
   "start_distance_m": 2118.0,
   "end_distance_m": 2218.0,
   "midpoint_distance_m": 2168.0,
   "start_elevation_m": 120.15276158820755,
   "end_elevation_m": 139.28929649848902,
   "start_xy": [
    344325.47647310013,
    215770.99337137167
   ],
   "end_xy": [
    344361.44884561806,
    215863.94000968756
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.175883354905125,
   "start_distance_m": 888.0,
   "end_distance_m": 893.0,
   "midpoint_distance_m": 890.5,
   "start_elevation_m": 99.2358792306449,
   "end_elevation_m": 98.57708506289964,
   "start_xy": [
    344864.5145821395,
    214877.0018153681
   ],
   "end_xy": [
    344861.40676488454,
    214880.91863447422
   ]
  },
  "min_10m": {
   "gradient_pct": -10.51577990994005,
   "start_distance_m": 888.0,
   "end_distance_m": 898.0,
   "midpoint_distance_m": 893.0,
   "start_elevation_m": 99.2358792306449,
   "end_elevation_m": 98.18430123965089,
   "start_xy": [
    344864.5145821395,
    214877.0018153681
   ],
   "end_xy": [
    344858.29894762964,
    214884.8354535803
   ]
  },
  "min_20m": {
   "gradient_pct": -7.719758082660562,
   "start_distance_m": 1719.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1729.0,
   "start_elevation_m": 107.71835922235644,
   "end_elevation_m": 106.17440760582433,
   "start_xy": [
    344534.3790867102,
    215577.48196445827
   ],
   "end_xy": [
    344515.26950484054,
    215583.3533202388
   ]
  },
  "min_25m": {
   "gradient_pct": -7.47597685414604,
   "start_distance_m": 1722.0,
   "end_distance_m": 1747.0,
   "midpoint_distance_m": 1734.5,
   "start_elevation_m": 107.51822342291874,
   "end_elevation_m": 105.64922920938223,
   "start_xy": [
    344531.53389912995,
    215578.43323078967
   ],
   "end_xy": [
    344507.5432519022,
    215585.4281733741
   ]
  },
  "min_50m": {
   "gradient_pct": -6.936839674642783,
   "start_distance_m": 1689.0,
   "end_distance_m": 1739.0,
   "midpoint_distance_m": 1714.0,
   "start_elevation_m": 109.64282744314572,
   "end_elevation_m": 106.17440760582433,
   "start_xy": [
    344561.31590568303,
    215564.69059121792
   ],
   "end_xy": [
    344515.26950484054,
    215583.3533202388
   ]
  },
  "min_100m": {
   "gradient_pct": -6.473122743461488,
   "start_distance_m": 1660.0,
   "end_distance_m": 1760.0,
   "midpoint_distance_m": 1710.0,
   "start_elevation_m": 111.52274475077417,
   "end_elevation_m": 105.04962200731268,
   "start_xy": [
    344586.27950563055,
    215549.93270483424
   ],
   "end_xy": [
    344494.9880908775,
    215588.7998097189
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 45.083395252554226,
   "start_distance_m": 587.0,
   "end_distance_m": 589.0,
   "midpoint_distance_m": 588.0,
   "start_elevation_m": 80.50425221281586,
   "end_elevation_m": 81.40592011786694,
   "start_xy": [
    345112.4538955839,
    214731.06197094865
   ],
   "end_xy": [
    345110.45690056076,
    214730.95237680027
   ]
  },
  "max_3m": {
   "gradient_pct": 42.57323079771993,
   "start_distance_m": 586.0,
   "end_distance_m": 589.0,
   "midpoint_distance_m": 587.5,
   "start_elevation_m": 80.12872319393534,
   "end_elevation_m": 81.40592011786694,
   "start_xy": [
    345113.45239309553,
    214731.11676802285
   ],
   "end_xy": [
    345110.45690056076,
    214730.95237680027
   ]
  }
 },
 "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": 0.29,
   "obstruction_max_height_m": 25.43,
   "flagged_windows_m": [
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    845.0,
    850.0
   ],
   [
    2269.0,
    2274.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/wales/dtm_1m/wg_del_20_344214_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_344215_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_344216_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_345214_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_345215_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_345216_20220112dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:07:07+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_20_344214_20220112dtm.tif",
   "wg_del_20_344215_20220112dtm.tif",
   "wg_del_20_344216_20220112dtm.tif",
   "wg_del_20_345214_20220112dtm.tif",
   "wg_del_20_345215_20220112dtm.tif",
   "wg_del_20_345216_20220112dtm.tif"
  ],
  "elevation_capture_dates": [
   "12-01-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.1% over 200 m (Terrain 50), gain 45.2 m over 1755 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 (notable slice 2026-08-11): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.8323, -2.8027)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.8323, -2.8027)'"
 },
 "area": {
  "place": "The Hendre",
  "county": "Sir Fynwy - Monmouthshire"
 },
 "reported_claims": [],
 "confidence": "U",
 "shape": {
  "ascent_concentration": 0.395,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 }
}