{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (53.1348, -3.4401)",
 "slug": "discovered-lane-53-1348-3-4401",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.71726246141827,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 332.0,
   "end_distance_m": 334.0,
   "start_elevation_m": 204.5721690855894,
   "end_elevation_m": 205.46651433481776,
   "min_gradient_pct": -13.50960086712405
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.182169319661966,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 330.0,
   "end_distance_m": 333.0,
   "start_elevation_m": 203.83836699865662,
   "end_elevation_m": 205.10383207824648,
   "min_gradient_pct": -6.343699685956494
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.486892204405194,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 328.0,
   "end_distance_m": 333.0,
   "start_elevation_m": 203.17948746802622,
   "end_elevation_m": 205.10383207824648,
   "min_gradient_pct": -5.475468832393062
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.52864689677557,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 326.0,
   "end_distance_m": 336.0,
   "start_elevation_m": 202.71412937346042,
   "end_elevation_m": 205.86699406313798,
   "min_gradient_pct": -4.5192488774839035
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 29.409235792521997,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 803.0,
   "end_distance_m": 823.0,
   "start_elevation_m": 261.49029354715486,
   "end_elevation_m": 267.37214070565926,
   "min_gradient_pct": -3.3356080148620038
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.397085217104404,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 802.0,
   "end_distance_m": 827.0,
   "start_elevation_m": 261.258397571551,
   "end_elevation_m": 268.3576688758271,
   "min_gradient_pct": -3.0683620547362125
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 25.660464569454575,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 790.0,
   "end_distance_m": 840.0,
   "start_elevation_m": 258.5523169309926,
   "end_elevation_m": 271.3825492157199,
   "min_gradient_pct": -2.2888405511128553
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.95458652161329,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 753.0,
   "end_distance_m": 853.0,
   "start_elevation_m": 252.660558452268,
   "end_elevation_m": 273.6151449738813,
   "min_gradient_pct": -1.4277732752632062
  }
 ],
 "shape": {
  "ascent_concentration": 0.492,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 245.0,
  "shape_class": "stepped"
 },
 "length_m": 855.9999999999835,
 "start_elevation_m": 192.01802550696962,
 "end_elevation_m": 273.7637705216341,
 "endpoint_gain_m": 81.7457450146645,
 "overall_gradient_pct": 9.549736567133886,
 "accumulated_ascent_m": 86.19891241089184,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.486892204405194,
   "start_distance_m": 328.0,
   "end_distance_m": 333.0,
   "midpoint_distance_m": 330.5,
   "start_elevation_m": 203.17948746802622,
   "end_elevation_m": 205.10383207824648,
   "start_xy": [
    304288.7084984908,
    361114.48866889236
   ],
   "end_xy": [
    304284.24197326385,
    361112.2414160724
   ]
  },
  "max_10m": {
   "gradient_pct": 31.52864689677557,
   "start_distance_m": 326.0,
   "end_distance_m": 336.0,
   "midpoint_distance_m": 331.0,
   "start_elevation_m": 202.71412937346042,
   "end_elevation_m": 205.86699406313798,
   "start_xy": [
    304290.4951432474,
    361115.3875016346
   ],
   "end_xy": [
    304281.5767753794,
    361110.867768787
   ]
  },
  "max_20m": {
   "gradient_pct": 29.409235792521997,
   "start_distance_m": 803.0,
   "end_distance_m": 823.0,
   "midpoint_distance_m": 813.0,
   "start_elevation_m": 261.49029354715486,
   "end_elevation_m": 267.37214070565926,
   "start_xy": [
    303989.7564498075,
    360933.46371088264
   ],
   "end_xy": [
    303970.88873489643,
    360939.3946334054
   ]
  },
  "max_25m": {
   "gradient_pct": 28.397085217104404,
   "start_distance_m": 802.0,
   "end_distance_m": 827.0,
   "midpoint_distance_m": 814.5,
   "start_elevation_m": 261.258397571551,
   "end_elevation_m": 268.3576688758271,
   "start_xy": [
    303990.73791335884,
    360933.2720628288
   ],
   "end_xy": [
    303967.4073963701,
    360941.3644753903
   ]
  },
  "max_50m": {
   "gradient_pct": 25.660464569454575,
   "start_distance_m": 790.0,
   "end_distance_m": 840.0,
   "midpoint_distance_m": 815.0,
   "start_elevation_m": 258.5523169309926,
   "end_elevation_m": 271.3825492157199,
   "start_xy": [
    304002.6275653363,
    360931.653178416
   ],
   "end_xy": [
    303957.41145770624,
    360949.6280646082
   ]
  },
  "max_100m": {
   "gradient_pct": 20.95458652161329,
   "start_distance_m": 753.0,
   "end_distance_m": 853.0,
   "midpoint_distance_m": 803.0,
   "start_elevation_m": 252.660558452268,
   "end_elevation_m": 273.6151449738813,
   "start_xy": [
    304037.4059105654,
    360919.212207336
   ],
   "end_xy": [
    303947.65271894814,
    360958.216834367
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.475468832393062,
   "start_distance_m": 51.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 53.5,
   "start_elevation_m": 193.7832954380314,
   "end_elevation_m": 193.50952199641173,
   "start_xy": [
    304471.98867493065,
    361296.08809499914
   ],
   "end_xy": [
    304470.29964654683,
    361291.382015978
   ]
  },
  "min_10m": {
   "gradient_pct": -4.5192488774839035,
   "start_distance_m": 49.0,
   "end_distance_m": 59.0,
   "midpoint_distance_m": 54.0,
   "start_elevation_m": 193.8672473255875,
   "end_elevation_m": 193.4153224378391,
   "start_xy": [
    304472.6644502525,
    361297.97046786343
   ],
   "end_xy": [
    304469.285508848,
    361288.5586271063
   ]
  },
  "min_20m": {
   "gradient_pct": -3.3356080148620038,
   "start_distance_m": 40.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 194.0644753296526,
   "end_elevation_m": 193.3973537266802,
   "start_xy": [
    304475.70566405717,
    361306.44106472714
   ],
   "end_xy": [
    304468.948664755,
    361287.6170666699
   ]
  },
  "min_25m": {
   "gradient_pct": -3.0683620547362125,
   "start_distance_m": 40.0,
   "end_distance_m": 65.0,
   "midpoint_distance_m": 52.5,
   "start_elevation_m": 194.0644753296526,
   "end_elevation_m": 193.29738481596854,
   "start_xy": [
    304475.70566405717,
    361306.44106472714
   ],
   "end_xy": [
    304467.258751151,
    361282.9113051426
   ]
  },
  "min_50m": {
   "gradient_pct": -2.2888405511128553,
   "start_distance_m": 132.0,
   "end_distance_m": 182.0,
   "midpoint_distance_m": 157.0,
   "start_elevation_m": 192.95535573719368,
   "end_elevation_m": 191.81093546163726,
   "start_xy": [
    304441.17786398396,
    361221.39307205414
   ],
   "end_xy": [
    304415.3784598152,
    361178.5899879325
   ]
  },
  "min_100m": {
   "gradient_pct": -1.4277732752632062,
   "start_distance_m": 82.0,
   "end_distance_m": 182.0,
   "midpoint_distance_m": 132.0,
   "start_elevation_m": 193.23870873690046,
   "end_elevation_m": 191.81093546163726,
   "start_xy": [
    304461.51557248365,
    361266.9108097843
   ],
   "end_xy": [
    304415.3784598152,
    361178.5899879325
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.71726246141827,
   "start_distance_m": 332.0,
   "end_distance_m": 334.0,
   "midpoint_distance_m": 333.0,
   "start_elevation_m": 204.5721690855894,
   "end_elevation_m": 205.46651433481776,
   "start_xy": [
    304285.13539304596,
    361112.69063883275
   ],
   "end_xy": [
    304283.34874372464,
    361111.79181515385
   ]
  },
  "max_3m": {
   "gradient_pct": 42.182169319661966,
   "start_distance_m": 330.0,
   "end_distance_m": 333.0,
   "midpoint_distance_m": 331.5,
   "start_elevation_m": 203.83836699865662,
   "end_elevation_m": 205.10383207824648,
   "start_xy": [
    304286.92184937035,
    361113.5898457073
   ],
   "end_xy": [
    304284.24197326385,
    361112.2414160724
   ]
  }
 },
 "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": 0.371,
   "obstruction_max_height_m": 18.88,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_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_7_303360_20210211dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_7_303361_20210211dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_7_304360_20210211dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_7_304361_20210211dtm.tif"
  ],
  "calculated_at": "2026-09-15T04:03:09+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_7_303360_20210211dtm.tif",
   "wg_del_7_303361_20210211dtm.tif",
   "wg_del_7_304360_20210211dtm.tif",
   "wg_del_7_304361_20210211dtm.tif"
  ],
  "elevation_capture_dates": [
   "11-02-2021"
  ],
  "route_cut_m": 856.0,
  "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": "Pant-pastynog",
  "county": "Sir Ddinbych - Denbighshire"
 }
}