{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.9682, -3.8728)",
 "slug": "discovered-lane-51-9682-3-8728",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 40.73706187920578,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 33.0,
   "end_distance_m": 35.0,
   "start_elevation_m": 64.3702853692518,
   "end_elevation_m": 65.18502660683592,
   "min_gradient_pct": -32.46807558884086,
   "suppressed_max_gradient_pct": 54.92835058744632,
   "suppressed_location_m": [
    85.0,
    87.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.85151047845242,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2592.0,
   "end_distance_m": 2595.0,
   "start_elevation_m": 178.3080182158247,
   "end_elevation_m": 179.29356353017826,
   "min_gradient_pct": -23.356398418351887,
   "suppressed_max_gradient_pct": 49.40514464159094,
   "suppressed_location_m": [
    84.0,
    87.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.096850491569626,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2591.0,
   "end_distance_m": 2596.0,
   "start_elevation_m": 178.02682274186722,
   "end_elevation_m": 179.4816652664457,
   "min_gradient_pct": -18.828240641930165,
   "suppressed_max_gradient_pct": 39.73417064218978,
   "suppressed_location_m": [
    93.0,
    98.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.02048694028582,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "start_elevation_m": 177.63121706103055,
   "end_elevation_m": 179.73326575505914,
   "min_gradient_pct": -15.553012663901313,
   "suppressed_max_gradient_pct": 31.268362375721637,
   "suppressed_location_m": [
    82.0,
    92.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 18.671229317760805,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 903.0,
   "end_distance_m": 923.0,
   "start_elevation_m": 175.99901989150698,
   "end_elevation_m": 179.73326575505914,
   "min_gradient_pct": -13.611023997269172,
   "suppressed_max_gradient_pct": 28.82739577703731,
   "suppressed_location_m": [
    78.0,
    98.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 17.92932171958779,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_unresolved"
   ],
   "start_distance_m": 486.0,
   "end_distance_m": 511.0,
   "start_elevation_m": 126.51366391164483,
   "end_elevation_m": 130.99599434154177,
   "min_gradient_pct": -13.168119780255665,
   "suppressed_max_gradient_pct": 26.99753830609262,
   "suppressed_location_m": [
    73.0,
    98.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.322029687458823,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 61.25917930300226,
   "end_elevation_m": 69.42019414673167,
   "min_gradient_pct": -11.028631254301501,
   "suppressed_max_gradient_pct": 23.317393977392754,
   "suppressed_location_m": [
    65.0,
    115.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.582752209180539,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 767.0,
   "end_distance_m": 867.0,
   "start_elevation_m": 157.9555157958091,
   "end_elevation_m": 170.53826800498965,
   "min_gradient_pct": -10.80813610190498,
   "suppressed_max_gradient_pct": 19.450718125586604,
   "suppressed_location_m": [
    14.0,
    114.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.508,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "stepped"
 },
 "length_m": 4493.466790553351,
 "start_elevation_m": 59.43058098326831,
 "end_elevation_m": 242.0746942151809,
 "endpoint_gain_m": 182.6441132319126,
 "overall_gradient_pct": 4.064659242967739,
 "accumulated_ascent_m": 276.467357040853,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.096850491569626,
   "start_distance_m": 2591.0,
   "end_distance_m": 2596.0,
   "midpoint_distance_m": 2593.5,
   "start_elevation_m": 178.02682274186722,
   "end_elevation_m": 179.4816652664457,
   "start_xy": [
    271860.15470461163,
    233754.4383717822
   ],
   "end_xy": [
    271859.39971521025,
    233759.38104220034
   ]
  },
  "max_10m": {
   "gradient_pct": 21.02048694028582,
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "midpoint_distance_m": 918.0,
   "start_elevation_m": 177.63121706103055,
   "end_elevation_m": 179.73326575505914,
   "start_xy": [
    271772.91915625223,
    232362.4500495067
   ],
   "end_xy": [
    271780.1131346827,
    232369.3960286571
   ]
  },
  "max_20m": {
   "gradient_pct": 18.671229317760805,
   "start_distance_m": 903.0,
   "end_distance_m": 923.0,
   "midpoint_distance_m": 913.0,
   "start_elevation_m": 175.99901989150698,
   "end_elevation_m": 179.73326575505914,
   "start_xy": [
    271765.7251778218,
    232355.5040703563
   ],
   "end_xy": [
    271780.1131346827,
    232369.3960286571
   ]
  },
  "max_25m": {
   "gradient_pct": 17.92932171958779,
   "start_distance_m": 486.0,
   "end_distance_m": 511.0,
   "midpoint_distance_m": 498.5,
   "start_elevation_m": 126.51366391164483,
   "end_elevation_m": 130.99599434154177,
   "start_xy": [
    271650.3331480401,
    231970.6148724288
   ],
   "end_xy": [
    271665.49427391455,
    231990.49300455034
   ]
  },
  "max_50m": {
   "gradient_pct": 16.322029687458823,
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 38.0,
   "start_elevation_m": 61.25917930300226,
   "end_elevation_m": 69.42019414673167,
   "start_xy": [
    271441.06601393555,
    231638.70437663607
   ],
   "end_xy": [
    271442.7149925516,
    231683.4834748361
   ]
  },
  "max_100m": {
   "gradient_pct": 12.582752209180539,
   "start_distance_m": 767.0,
   "end_distance_m": 867.0,
   "midpoint_distance_m": 817.0,
   "start_elevation_m": 157.9555157958091,
   "end_elevation_m": 170.53826800498965,
   "start_xy": [
    271735.1194911365,
    232228.59088915485
   ],
   "end_xy": [
    271744.57465792994,
    232328.14043699225
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.828240641930165,
   "start_distance_m": 1542.0,
   "end_distance_m": 1547.0,
   "midpoint_distance_m": 1544.5,
   "start_elevation_m": 176.96551141147285,
   "end_elevation_m": 176.02409937937634,
   "start_xy": [
    272080.81718409085,
    232892.28839373263
   ],
   "end_xy": [
    272084.26151604723,
    232895.91283473768
   ]
  },
  "min_10m": {
   "gradient_pct": -15.553012663901313,
   "start_distance_m": 1552.0,
   "end_distance_m": 1562.0,
   "midpoint_distance_m": 1557.0,
   "start_elevation_m": 175.79860787840914,
   "end_elevation_m": 174.243306612019,
   "start_xy": [
    272087.7064194055,
    232899.53673304647
   ],
   "end_xy": [
    272094.59570049786,
    232906.78502882572
   ]
  },
  "min_20m": {
   "gradient_pct": -13.611023997269172,
   "start_distance_m": 1542.0,
   "end_distance_m": 1562.0,
   "midpoint_distance_m": 1552.0,
   "start_elevation_m": 176.96551141147285,
   "end_elevation_m": 174.243306612019,
   "start_xy": [
    272080.81718409085,
    232892.28839373263
   ],
   "end_xy": [
    272094.59570049786,
    232906.78502882572
   ]
  },
  "min_25m": {
   "gradient_pct": -13.168119780255665,
   "start_distance_m": 1542.0,
   "end_distance_m": 1567.0,
   "midpoint_distance_m": 1554.5,
   "start_elevation_m": 176.96551141147285,
   "end_elevation_m": 173.67348146640893,
   "start_xy": [
    272080.81718409085,
    232892.28839373263
   ],
   "end_xy": [
    272098.0406024795,
    232910.40892568597
   ]
  },
  "min_50m": {
   "gradient_pct": -11.028631254301501,
   "start_distance_m": 1542.0,
   "end_distance_m": 1592.0,
   "midpoint_distance_m": 1567.0,
   "start_elevation_m": 176.96551141147285,
   "end_elevation_m": 171.4511957843221,
   "start_xy": [
    272080.81718409085,
    232892.28839373263
   ],
   "end_xy": [
    272115.26459331985,
    232928.5289160477
   ]
  },
  "min_100m": {
   "gradient_pct": -10.80813610190498,
   "start_distance_m": 1551.0,
   "end_distance_m": 1651.0,
   "midpoint_distance_m": 1601.0,
   "start_elevation_m": 175.89820202319157,
   "end_elevation_m": 165.0900659212866,
   "start_xy": [
    272087.0175385716,
    232898.81185843892
   ],
   "end_xy": [
    272150.5312882534,
    232975.3548114112
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 40.73706187920578,
   "start_distance_m": 33.0,
   "end_distance_m": 35.0,
   "midpoint_distance_m": 34.0,
   "start_elevation_m": 64.3702853692518,
   "end_elevation_m": 65.18502660683592,
   "start_xy": [
    271438.96297312685,
    231658.4561316784
   ],
   "end_xy": [
    271438.56209362997,
    231660.41554349568
   ]
  },
  "max_3m": {
   "gradient_pct": 32.85151047845242,
   "start_distance_m": 2592.0,
   "end_distance_m": 2595.0,
   "midpoint_distance_m": 2593.5,
   "start_elevation_m": 178.3080182158247,
   "end_elevation_m": 179.29356353017826,
   "start_xy": [
    271860.00373537804,
    233755.42691024177
   ],
   "end_xy": [
    271859.5506844638,
    233758.3925037438
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.001,
   "windows_resited": [
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.008,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "placement_suppression": {
   "masked_fraction": 0.015,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.062,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 4,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 203.0,
     "end_m": 228.0,
     "raw_pct": 23.53,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 67.0,
     "end_m": 87.0,
     "raw_pct": 25.0,
     "reason": "hump+mask-edge"
    },
    {
     "window_m": 10.0,
     "start_m": 77.0,
     "end_m": 87.0,
     "raw_pct": 30.67,
     "reason": "hump+mask-edge"
    },
    {
     "window_m": 5.0,
     "start_m": 82.0,
     "end_m": 87.0,
     "raw_pct": 39.51,
     "reason": "hump+mask-edge+short-step"
    },
    {
     "window_m": 25.0,
     "start_m": 514.0,
     "end_m": 539.0,
     "raw_pct": 22.28,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 876.0,
     "end_m": 896.0,
     "raw_pct": 23.81,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 877.0,
     "end_m": 887.0,
     "raw_pct": 29.82,
     "reason": "hump"
    },
    {
     "window_m": 5.0,
     "start_m": 184.0,
     "end_m": 189.0,
     "raw_pct": 35.78,
     "reason": "short-step"
    },
    {
     "window_m": 25.0,
     "start_m": 333.0,
     "end_m": 358.0,
     "raw_pct": 22.08,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 338.0,
     "end_m": 358.0,
     "raw_pct": 23.13,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 344.0,
     "end_m": 354.0,
     "raw_pct": 28.16,
     "reason": "hump"
    },
    {
     "window_m": 25.0,
     "start_m": 545.0,
     "end_m": 570.0,
     "raw_pct": 19.01,
     "reason": "mask-edge"
    },
    {
     "window_m": 20.0,
     "start_m": 95.0,
     "end_m": 115.0,
     "raw_pct": 22.81,
     "reason": "mask-edge"
    },
    {
     "window_m": 10.0,
     "start_m": 96.0,
     "end_m": 106.0,
     "raw_pct": 24.91,
     "reason": "mask-edge"
    },
    {
     "window_m": 5.0,
     "start_m": 2454.0,
     "end_m": 2459.0,
     "raw_pct": 31.33,
     "reason": "short-step"
    }
   ],
   "advisory": [],
   "unresolved": [
    {
     "window_m": 25.0,
     "start_m": 486.0,
     "end_m": 511.0,
     "pct": 17.93,
     "reason": "mask-edge"
    }
   ]
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.252,
   "obstruction_max_height_m": 20.2,
   "flagged_windows_m": [
    2,
    3,
    5,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    65.0,
    117.0
   ],
   [
    120.0,
    150.0
   ],
   [
    182.0,
    191.0
   ],
   [
    201.0,
    230.0
   ],
   [
    331.0,
    360.0
   ],
   [
    512.0,
    541.0
   ],
   [
    543.0,
    572.0
   ],
   [
    874.0,
    898.0
   ],
   [
    2452.0,
    2461.0
   ],
   [
    2990.0,
    3020.0
   ]
  ],
  "review": [
   "short_window_divergence",
   "texture_unresolved"
  ],
  "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_28_270231_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_270232_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_270233_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_270234_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_271231_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_271232_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_271233_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_271234_20220315dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_30_272231_20220323dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_30_272232_20220323dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_30_272233_20220323dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_30_272234_20220323dtm.tif"
  ],
  "calculated_at": "2026-09-15T04:04:09+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",
  "run_id": "retro-260914",
  "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_28_270231_20220315dtm.tif",
   "wg_del_28_270232_20220315dtm.tif",
   "wg_del_28_270233_20220315dtm.tif",
   "wg_del_28_270234_20220315dtm.tif",
   "wg_del_28_271231_20220315dtm.tif",
   "wg_del_28_271232_20220315dtm.tif",
   "wg_del_28_271233_20220315dtm.tif",
   "wg_del_28_271234_20220315dtm.tif",
   "wg_del_30_272231_20220323dtm.tif",
   "wg_del_30_272232_20220323dtm.tif",
   "wg_del_30_272233_20220323dtm.tif",
   "wg_del_30_272234_20220323dtm.tif"
  ],
  "elevation_capture_dates": [
   "15-03-2022",
   "23-03-2022"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Llanwrda",
  "county": "Sir Gaerfyrddin - Carmarthenshire"
 }
}