{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (52.9964, -3.9324)",
 "slug": "discovered-lane-52-9964-3-9324",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.11530036562499,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 443.0,
   "end_distance_m": 445.0,
   "start_elevation_m": 258.97837825103016,
   "end_elevation_m": 259.40068425834266,
   "min_gradient_pct": -0.5100788709796689
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.09958166684578,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 443.0,
   "end_distance_m": 446.0,
   "start_elevation_m": 258.97837825103016,
   "end_elevation_m": 259.61136570103554,
   "min_gradient_pct": -0.1497690002490041
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 20.532240992682773,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 452.0,
   "end_distance_m": 457.0,
   "start_elevation_m": 260.78514176216623,
   "end_elevation_m": 261.8117538118004,
   "min_gradient_pct": -0.1798799642068616
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.277938786330196,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 447.0,
   "end_distance_m": 457.0,
   "start_elevation_m": 259.78395993316735,
   "end_elevation_m": 261.8117538118004,
   "min_gradient_pct": 0.6121185375482696
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.186528488730744,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 437.0,
   "end_distance_m": 457.0,
   "start_elevation_m": 257.7744481140542,
   "end_elevation_m": 261.8117538118004,
   "min_gradient_pct": 1.2573551183950826
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.023943538874846,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 434.0,
   "end_distance_m": 459.0,
   "start_elevation_m": 257.1938761804182,
   "end_elevation_m": 262.1998620651369,
   "min_gradient_pct": 1.7002856068100982
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.57086515910686,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 415.0,
   "end_distance_m": 465.0,
   "start_elevation_m": 253.92417096684525,
   "end_elevation_m": 263.2096035463987,
   "min_gradient_pct": 2.8444115334708044
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.20563872854916,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 365.0,
   "end_distance_m": 465.0,
   "start_elevation_m": 246.00396481784952,
   "end_elevation_m": 263.2096035463987,
   "min_gradient_pct": 3.227402451165915
  }
 ],
 "shape": {
  "ascent_concentration": 0.454,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 211.0,
  "shape_class": "stepped"
 },
 "length_m": 465.6785152905024,
 "start_elevation_m": 219.8996617913529,
 "end_elevation_m": 263.3268696132825,
 "endpoint_gain_m": 43.427207821929585,
 "overall_gradient_pct": 9.325576850982392,
 "accumulated_ascent_m": 43.46082187898941,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 20.532240992682773,
   "start_distance_m": 452.0,
   "end_distance_m": 457.0,
   "midpoint_distance_m": 454.5,
   "start_elevation_m": 260.78514176216623,
   "end_elevation_m": 261.8117538118004,
   "start_xy": [
    270413.9452730346,
    346283.11311961495
   ],
   "end_xy": [
    270416.0276073374,
    346287.6588741014
   ]
  },
  "max_10m": {
   "gradient_pct": 20.277938786330196,
   "start_distance_m": 447.0,
   "end_distance_m": 457.0,
   "midpoint_distance_m": 452.0,
   "start_elevation_m": 259.78395993316735,
   "end_elevation_m": 261.8117538118004,
   "start_xy": [
    270411.8909460886,
    346278.554656122
   ],
   "end_xy": [
    270416.0276073374,
    346287.6588741014
   ]
  },
  "max_20m": {
   "gradient_pct": 20.186528488730744,
   "start_distance_m": 437.0,
   "end_distance_m": 457.0,
   "midpoint_distance_m": 447.0,
   "start_elevation_m": 257.7744481140542,
   "end_elevation_m": 261.8117538118004,
   "start_xy": [
    270407.79125652375,
    346269.4336613587
   ],
   "end_xy": [
    270416.0276073374,
    346287.6588741014
   ]
  },
  "max_25m": {
   "gradient_pct": 20.023943538874846,
   "start_distance_m": 434.0,
   "end_distance_m": 459.0,
   "midpoint_distance_m": 446.5,
   "start_elevation_m": 257.1938761804182,
   "end_elevation_m": 262.1998620651369,
   "start_xy": [
    270406.5613496543,
    346266.69736292976
   ],
   "end_xy": [
    270416.8605410585,
    346289.47717589606
   ]
  },
  "max_50m": {
   "gradient_pct": 18.57086515910686,
   "start_distance_m": 415.0,
   "end_distance_m": 465.0,
   "midpoint_distance_m": 440.0,
   "start_elevation_m": 253.92417096684525,
   "end_elevation_m": 263.2096035463987,
   "start_xy": [
    270399.3495399368,
    346249.1472982931
   ],
   "end_xy": [
    270419.36050297023,
    346294.9315485148
   ]
  },
  "max_100m": {
   "gradient_pct": 17.20563872854916,
   "start_distance_m": 365.0,
   "end_distance_m": 465.0,
   "midpoint_distance_m": 415.0,
   "start_elevation_m": 246.00396481784952,
   "end_elevation_m": 263.2096035463987,
   "start_xy": [
    270399.09488792025,
    346199.6509833606
   ],
   "end_xy": [
    270419.36050297023,
    346294.9315485148
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.1798799642068616,
   "start_distance_m": 151.0,
   "end_distance_m": 156.0,
   "midpoint_distance_m": 153.5,
   "start_elevation_m": 227.5986441786854,
   "end_elevation_m": 227.58965018047505,
   "start_xy": [
    270407.36465406726,
    345986.00301990105
   ],
   "end_xy": [
    270407.4305856208,
    345991.00258518517
   ]
  },
  "min_10m": {
   "gradient_pct": 0.6121185375482696,
   "start_distance_m": 150.0,
   "end_distance_m": 160.0,
   "midpoint_distance_m": 155.0,
   "start_elevation_m": 227.58288473966917,
   "end_elevation_m": 227.644096593424,
   "start_xy": [
    270407.35146775655,
    345985.0031068442
   ],
   "end_xy": [
    270407.48499156465,
    345995.00221209996
   ]
  },
  "min_20m": {
   "gradient_pct": 1.2573551183950826,
   "start_distance_m": 147.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 157.0,
   "start_elevation_m": 227.53802941696256,
   "end_elevation_m": 227.78950044064158,
   "start_xy": [
    270407.34180877905,
    345982.00316297676
   ],
   "end_xy": [
    270407.6060508627,
    346002.00116521074
   ]
  },
  "min_25m": {
   "gradient_pct": 1.7002856068100982,
   "start_distance_m": 147.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 159.5,
   "start_elevation_m": 227.53802941696256,
   "end_elevation_m": 227.96310081866508,
   "start_xy": [
    270407.34180877905,
    345982.00316297676
   ],
   "end_xy": [
    270407.69252178987,
    346007.0004174327
   ]
  },
  "min_50m": {
   "gradient_pct": 2.8444115334708044,
   "start_distance_m": 127.0,
   "end_distance_m": 177.0,
   "midpoint_distance_m": 152.0,
   "start_elevation_m": 226.75998395799178,
   "end_elevation_m": 228.18218972472718,
   "start_xy": [
    270407.33170442673,
    345962.0031655292
   ],
   "end_xy": [
    270407.77899271704,
    346011.99966965464
   ]
  },
  "min_100m": {
   "gradient_pct": 3.227402451165915,
   "start_distance_m": 136.0,
   "end_distance_m": 236.0,
   "midpoint_distance_m": 186.0,
   "start_elevation_m": 227.15368642568382,
   "end_elevation_m": 230.38108887684973,
   "start_xy": [
    270407.3362513853,
    345971.0031643806
   ],
   "end_xy": [
    270407.42818584986,
    346070.9734277047
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.11530036562499,
   "start_distance_m": 443.0,
   "end_distance_m": 445.0,
   "midpoint_distance_m": 444.0,
   "start_elevation_m": 258.97837825103016,
   "end_elevation_m": 259.40068425834266,
   "start_xy": [
    270410.25107026263,
    346274.9062582167
   ],
   "end_xy": [
    270411.0710081756,
    346276.73045716935
   ]
  },
  "max_3m": {
   "gradient_pct": 21.09958166684578,
   "start_distance_m": 443.0,
   "end_distance_m": 446.0,
   "midpoint_distance_m": 444.5,
   "start_elevation_m": 258.97837825103016,
   "end_elevation_m": 259.61136570103554,
   "start_xy": [
    270410.25107026263,
    346274.9062582167
   ],
   "end_xy": [
    270411.4809771321,
    346277.6425566457
   ]
  }
 },
 "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": 0.045,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.017,
   "obstruction_max_height_m": 5.02,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    228.0,
    248.0
   ]
  ],
  "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_20_270345_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_270346_20220111dtm.tif"
  ],
  "calculated_at": "2026-09-04T22:06:27+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": "hunt-wales-260905",
  "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_270345_20220111dtm.tif",
   "wg_del_20_270346_20220111dtm.tif"
  ],
  "elevation_capture_dates": [
   "11-01-2022"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Blaenau Ffestiniog",
  "county": "Gwynedd - Gwynedd"
 }
}