{
 "ocl_version": "0.1.0",
 "name": "Govilon to Gilwern Hill",
 "slug": "discovered-lane-51-8118-3-0856",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.923998506090015,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1070.0,
   "end_distance_m": 1072.0,
   "start_elevation_m": 256.8709719268904,
   "end_elevation_m": 257.8294518970122,
   "min_gradient_pct": -196.0425008033326,
   "suppressed_max_gradient_pct": 156.4828652957928,
   "suppressed_location_m": [
    175.0,
    177.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 47.11114243802589,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1206.0,
   "end_distance_m": 1209.0,
   "start_elevation_m": 277.9094255685358,
   "end_elevation_m": 279.3227598416766,
   "min_gradient_pct": -199.18308693642643,
   "suppressed_max_gradient_pct": 125.76633419037933,
   "suppressed_location_m": [
    175.0,
    178.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 36.90088754587691,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1206.0,
   "end_distance_m": 1211.0,
   "start_elevation_m": 277.9094255685358,
   "end_elevation_m": 279.75446994582967,
   "min_gradient_pct": -115.26259090533415,
   "suppressed_max_gradient_pct": 99.41566437114716,
   "suppressed_location_m": [
    172.0,
    177.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.444278261065506,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1205.0,
   "end_distance_m": 1215.0,
   "start_elevation_m": 277.77189579431695,
   "end_elevation_m": 280.9163236204235,
   "min_gradient_pct": -52.448023622274604,
   "suppressed_max_gradient_pct": 68.56482694833971,
   "suppressed_location_m": [
    172.0,
    182.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.82378801522208,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1195.0,
   "end_distance_m": 1215.0,
   "start_elevation_m": 276.1515660173791,
   "end_elevation_m": 280.9163236204235,
   "min_gradient_pct": -16.339418551972642,
   "suppressed_max_gradient_pct": 42.95430082732082,
   "suppressed_location_m": [
    172.0,
    192.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.156005624437967,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1079.0,
   "end_distance_m": 1104.0,
   "start_elevation_m": 258.19096254648844,
   "end_elevation_m": 263.7299639525979,
   "min_gradient_pct": -11.216656807235267,
   "suppressed_max_gradient_pct": 38.243794394476936,
   "suppressed_location_m": [
    172.0,
    197.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.46703244045534,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1005.0,
   "end_distance_m": 1055.0,
   "start_elevation_m": 242.50739226857365,
   "end_elevation_m": 252.74090848880132,
   "min_gradient_pct": -8.76981176778122,
   "suppressed_max_gradient_pct": 24.876491938564982,
   "suppressed_location_m": [
    172.0,
    222.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.102394495282994,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 957.0,
   "end_distance_m": 1057.0,
   "start_elevation_m": 235.0955962630234,
   "end_elevation_m": 253.1979907583064,
   "min_gradient_pct": -8.510534306178272,
   "suppressed_max_gradient_pct": 21.434234220545303,
   "suppressed_location_m": [
    1004.0,
    1104.0
   ]
  }
 ],
 "length_m": 1787.8894565067271,
 "start_elevation_m": 132.36022334076415,
 "end_elevation_m": 319.2533454072259,
 "endpoint_gain_m": 186.89312206646173,
 "overall_gradient_pct": 10.453281738772786,
 "accumulated_ascent_m": 206.88684556621408,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 36.90088754587691,
   "start_distance_m": 1206.0,
   "end_distance_m": 1211.0,
   "midpoint_distance_m": 1208.5,
   "start_elevation_m": 277.9094255685358,
   "end_elevation_m": 279.75446994582967,
   "start_xy": [
    325055.6436937738,
    213111.44921955158
   ],
   "end_xy": [
    325051.87180558377,
    213108.16701610238
   ]
  },
  "max_10m": {
   "gradient_pct": 31.444278261065506,
   "start_distance_m": 1205.0,
   "end_distance_m": 1215.0,
   "midpoint_distance_m": 1210.0,
   "start_elevation_m": 277.77189579431695,
   "end_elevation_m": 280.9163236204235,
   "start_xy": [
    325056.3980714118,
    213112.10566024142
   ],
   "end_xy": [
    325048.85429503175,
    213105.54125334302
   ]
  },
  "max_20m": {
   "gradient_pct": 23.82378801522208,
   "start_distance_m": 1195.0,
   "end_distance_m": 1215.0,
   "midpoint_distance_m": 1205.0,
   "start_elevation_m": 276.1515660173791,
   "end_elevation_m": 280.9163236204235,
   "start_xy": [
    325064.36421597993,
    213117.89205722653
   ],
   "end_xy": [
    325048.85429503175,
    213105.54125334302
   ]
  },
  "max_25m": {
   "gradient_pct": 22.156005624437967,
   "start_distance_m": 1079.0,
   "end_distance_m": 1104.0,
   "midpoint_distance_m": 1091.5,
   "start_elevation_m": 258.19096254648844,
   "end_elevation_m": 263.7299639525979,
   "start_xy": [
    325179.3441269191,
    213111.5470433707
   ],
   "end_xy": [
    325154.4708841209,
    213110.9405843722
   ]
  },
  "max_50m": {
   "gradient_pct": 20.46703244045534,
   "start_distance_m": 1005.0,
   "end_distance_m": 1055.0,
   "midpoint_distance_m": 1030.0,
   "start_elevation_m": 242.50739226857365,
   "end_elevation_m": 252.74090848880132,
   "start_xy": [
    325248.12931262347,
    213133.9610444809
   ],
   "end_xy": [
    325203.19816937356,
    213114.13676984017
   ]
  },
  "max_100m": {
   "gradient_pct": 18.102394495282994,
   "start_distance_m": 957.0,
   "end_distance_m": 1057.0,
   "midpoint_distance_m": 1007.0,
   "start_elevation_m": 235.0955962630234,
   "end_elevation_m": 253.1979907583064,
   "start_xy": [
    325292.8887978,
    213150.98767260072
   ],
   "end_xy": [
    325201.2155285077,
    213113.87383411202
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -115.26259090533415,
   "start_distance_m": 167.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 169.5,
   "start_elevation_m": 150.08937896177792,
   "end_elevation_m": 144.32624941651122,
   "start_xy": [
    325948.21712668455,
    213522.77478135552
   ],
   "end_xy": [
    325944.42160311283,
    213519.51993868398
   ]
  },
  "min_10m": {
   "gradient_pct": -52.448023622274604,
   "start_distance_m": 162.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 167.0,
   "start_elevation_m": 149.57105177873868,
   "end_elevation_m": 144.32624941651122,
   "start_xy": [
    325952.0129322525,
    213526.02929513884
   ],
   "end_xy": [
    325944.42160311283,
    213519.51993868398
   ]
  },
  "min_20m": {
   "gradient_pct": -16.339418551972642,
   "start_distance_m": 152.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 162.0,
   "start_elevation_m": 147.59413312690575,
   "end_elevation_m": 144.32624941651122,
   "start_xy": [
    325959.60491759697,
    213532.5378862713
   ],
   "end_xy": [
    325944.42160311283,
    213519.51993868398
   ]
  },
  "min_25m": {
   "gradient_pct": -11.216656807235267,
   "start_distance_m": 1758.0,
   "end_distance_m": 1783.0,
   "midpoint_distance_m": 1770.5,
   "start_elevation_m": 322.5296773580748,
   "end_elevation_m": 319.725513156266,
   "start_xy": [
    324543.4087791406,
    213120.87081576893
   ],
   "end_xy": [
    324526.94410724967,
    213138.7715908633
   ]
  },
  "min_50m": {
   "gradient_pct": -8.76981176778122,
   "start_distance_m": 1737.0,
   "end_distance_m": 1787.0,
   "midpoint_distance_m": 1762.0,
   "start_elevation_m": 323.7227672526436,
   "end_elevation_m": 319.337861368753,
   "start_xy": [
    324561.1847476941,
    213109.68980767546
   ],
   "end_xy": [
    324525.3037554053,
    213142.41977477132
   ]
  },
  "min_100m": {
   "gradient_pct": -8.510534306178272,
   "start_distance_m": 1687.0,
   "end_distance_m": 1787.0,
   "midpoint_distance_m": 1737.0,
   "start_elevation_m": 327.8483956749313,
   "end_elevation_m": 319.337861368753,
   "start_xy": [
    324603.5172976758,
    213083.09146332022
   ],
   "end_xy": [
    324525.3037554053,
    213142.41977477132
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.923998506090015,
   "start_distance_m": 1070.0,
   "end_distance_m": 1072.0,
   "midpoint_distance_m": 1071.0,
   "start_elevation_m": 256.8709719268904,
   "end_elevation_m": 257.8294518970122,
   "start_xy": [
    325188.3094732136,
    213112.33607177334
   ],
   "end_xy": [
    325186.31717403705,
    213112.1607321283
   ]
  },
  "max_3m": {
   "gradient_pct": 47.11114243802589,
   "start_distance_m": 1206.0,
   "end_distance_m": 1209.0,
   "midpoint_distance_m": 1207.5,
   "start_elevation_m": 277.9094255685358,
   "end_elevation_m": 279.3227598416766,
   "start_xy": [
    325055.6436937738,
    213111.44921955158
   ],
   "end_xy": [
    325053.38056085975,
    213109.47989748206
   ]
  }
 },
 "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": 0.597,
   "obstruction_max_height_m": 24.03,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.034,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    142.0,
    183.0
   ],
   [
    403.0,
    408.0
   ],
   [
    428.0,
    433.0
   ],
   [
    1058.0,
    1064.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ]
 },
 "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_324213_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_325213_20220112dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_326213_20220112dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:07:06+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_324213_20220112dtm.tif",
   "wg_del_20_325213_20220112dtm.tif",
   "wg_del_20_326213_20220112dtm.tif"
  ],
  "elevation_capture_dates": [
   "12-01-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.7% over 200 m (Terrain 50), gain 170.4 m over 1603 m way. EXTENDED by graph walk: +4 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): endurance. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.8118, -3.0856)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.8118, -3.0856)'"
 },
 "area": {
  "place": "Cwm Llanwenarth",
  "county": "Sir Fynwy - Monmouthshire"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.36,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 227.0,
  "shape_class": "sustained"
 }
}