{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (52.9763, -3.8449)",
 "slug": "discovered-lane-52-9763-3-8449",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.43290206780796,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "structure_excluded_min",
    "texture_excluded"
   ],
   "start_distance_m": 1692.0,
   "end_distance_m": 1694.0,
   "start_elevation_m": 318.8259190089221,
   "end_elevation_m": 319.53457705027824,
   "min_gradient_pct": -21.897823097579305,
   "suppressed_max_gradient_pct": 53.94241689320154,
   "suppressed_location_m": [
    688.0,
    690.0
   ],
   "suppressed_min_gradient_pct": -88.18701510581377,
   "suppressed_min_location_m": [
    686.0,
    688.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.781996383542264,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "structure_excluded_min",
    "texture_excluded"
   ],
   "start_distance_m": 1801.0,
   "end_distance_m": 1804.0,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 333.40892187591743,
   "min_gradient_pct": -17.93612683137553,
   "suppressed_max_gradient_pct": 52.80666971409952,
   "suppressed_location_m": [
    688.0,
    691.0
   ],
   "suppressed_min_gradient_pct": -72.99835664036986,
   "suppressed_min_location_m": [
    685.0,
    688.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.712561190136284,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1801.0,
   "end_distance_m": 1806.0,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 333.651090043918,
   "min_gradient_pct": -11.84397297288001,
   "suppressed_max_gradient_pct": 38.73972903721267,
   "suppressed_location_m": [
    688.0,
    693.0
   ],
   "suppressed_min_gradient_pct": -43.44302664023871,
   "suppressed_min_location_m": [
    683.0,
    688.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 19.60374442393629,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min",
    "suppression_unstable",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1801.0,
   "end_distance_m": 1811.0,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 334.4758364268048,
   "min_gradient_pct": -6.792614774061576,
   "suppressed_max_gradient_pct": 31.504981535569527,
   "suppressed_location_m": [
    688.0,
    698.0
   ],
   "suppressed_min_gradient_pct": -19.53447391824625,
   "suppressed_min_location_m": [
    678.0,
    688.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 17.154246401945414,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 814.0,
   "end_distance_m": 834.0,
   "start_elevation_m": 230.24911918531885,
   "end_elevation_m": 233.67996846570793,
   "min_gradient_pct": -5.816129804593402,
   "suppressed_max_gradient_pct": 23.306222390750406,
   "suppressed_location_m": [
    688.0,
    708.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.605226699625177,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 814.0,
   "end_distance_m": 839.0,
   "start_elevation_m": 230.24911918531885,
   "end_elevation_m": 234.40042586022514,
   "min_gradient_pct": -5.273996595458129,
   "suppressed_max_gradient_pct": 21.070982848751783,
   "suppressed_location_m": [
    688.0,
    713.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.75997253543403,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 789.0,
   "end_distance_m": 839.0,
   "start_elevation_m": 226.52043959250813,
   "end_elevation_m": 234.40042586022514,
   "min_gradient_pct": -4.333553565467241,
   "suppressed_max_gradient_pct": 17.583631087367735,
   "suppressed_location_m": [
    1863.0,
    1913.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.663355383546131,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 782.0,
   "end_distance_m": 882.0,
   "start_elevation_m": 225.5759762229151,
   "end_elevation_m": 240.23933160646123,
   "min_gradient_pct": -3.768075198614895,
   "suppressed_max_gradient_pct": 15.726706917010517,
   "suppressed_location_m": [
    1855.0,
    1955.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.41,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 227.0,
  "shape_class": "sustained"
 },
 "length_m": 4495.9239303255745,
 "start_elevation_m": 172.08447117050298,
 "end_elevation_m": 475.1150400993367,
 "endpoint_gain_m": 303.0305689288337,
 "overall_gradient_pct": 6.74011779614095,
 "accumulated_ascent_m": 323.8087693571156,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.712561190136284,
   "start_distance_m": 1801.0,
   "end_distance_m": 1806.0,
   "midpoint_distance_m": 1803.5,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 333.651090043918,
   "start_xy": [
    276703.8013510195,
    346224.2663100316
   ],
   "end_xy": [
    276701.41229128244,
    346219.87400007795
   ]
  },
  "max_10m": {
   "gradient_pct": 19.60374442393629,
   "start_distance_m": 1801.0,
   "end_distance_m": 1811.0,
   "midpoint_distance_m": 1806.0,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 334.4758364268048,
   "start_xy": [
    276703.8013510195,
    346224.2663100316
   ],
   "end_xy": [
    276699.0234831561,
    346215.4815527428
   ]
  },
  "max_20m": {
   "gradient_pct": 17.154246401945414,
   "start_distance_m": 814.0,
   "end_distance_m": 834.0,
   "midpoint_distance_m": 824.0,
   "start_elevation_m": 230.24911918531885,
   "end_elevation_m": 233.67996846570793,
   "start_xy": [
    276641.99182695284,
    347195.53533755965
   ],
   "end_xy": [
    276643.6758249346,
    347175.606361489
   ]
  },
  "max_25m": {
   "gradient_pct": 16.605226699625177,
   "start_distance_m": 814.0,
   "end_distance_m": 839.0,
   "midpoint_distance_m": 826.5,
   "start_elevation_m": 230.24911918531885,
   "end_elevation_m": 234.40042586022514,
   "start_xy": [
    276641.99182695284,
    347195.53533755965
   ],
   "end_xy": [
    276644.0968453621,
    347170.62411927804
   ]
  },
  "max_50m": {
   "gradient_pct": 15.75997253543403,
   "start_distance_m": 789.0,
   "end_distance_m": 839.0,
   "midpoint_distance_m": 814.0,
   "start_elevation_m": 226.52043959250813,
   "end_elevation_m": 234.40042586022514,
   "start_xy": [
    276639.88600256876,
    347220.4464875474
   ],
   "end_xy": [
    276644.0968453621,
    347170.62411927804
   ]
  },
  "max_100m": {
   "gradient_pct": 14.663355383546131,
   "start_distance_m": 782.0,
   "end_distance_m": 882.0,
   "midpoint_distance_m": 832.0,
   "start_elevation_m": 225.5759762229151,
   "end_elevation_m": 240.23933160646123,
   "start_xy": [
    276639.2968688638,
    347227.42165169975
   ],
   "end_xy": [
    276647.71785168594,
    347127.7768555844
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -11.84397297288001,
   "start_distance_m": 982.0,
   "end_distance_m": 987.0,
   "midpoint_distance_m": 984.5,
   "start_elevation_m": 251.4848088923246,
   "end_elevation_m": 250.8926102436806,
   "start_xy": [
    276658.1758392179,
    347028.32599979267
   ],
   "end_xy": [
    276658.7027700372,
    347023.3538436475
   ]
  },
  "min_10m": {
   "gradient_pct": -6.792614774061576,
   "start_distance_m": 3710.0,
   "end_distance_m": 3720.0,
   "midpoint_distance_m": 3715.0,
   "start_elevation_m": 474.27161002568045,
   "end_elevation_m": 473.5923485482743,
   "start_xy": [
    276427.3597490309,
    344433.2878556207
   ],
   "end_xy": [
    276429.05343983974,
    344423.4323299281
   ]
  },
  "min_20m": {
   "gradient_pct": -5.816129804593402,
   "start_distance_m": 3700.0,
   "end_distance_m": 3720.0,
   "midpoint_distance_m": 3710.0,
   "start_elevation_m": 474.75557450919297,
   "end_elevation_m": 473.5923485482743,
   "start_xy": [
    276425.66668706323,
    344443.1434896629
   ],
   "end_xy": [
    276429.05343983974,
    344423.4323299281
   ]
  },
  "min_25m": {
   "gradient_pct": -5.273996595458129,
   "start_distance_m": 3695.0,
   "end_distance_m": 3720.0,
   "midpoint_distance_m": 3707.5,
   "start_elevation_m": 474.9108476971388,
   "end_elevation_m": 473.5923485482743,
   "start_xy": [
    276424.8153874716,
    344448.0704700454
   ],
   "end_xy": [
    276429.05343983974,
    344423.4323299281
   ]
  },
  "min_50m": {
   "gradient_pct": -4.333553565467241,
   "start_distance_m": 3732.0,
   "end_distance_m": 3782.0,
   "midpoint_distance_m": 3757.0,
   "start_elevation_m": 473.64133693566475,
   "end_elevation_m": 471.47456015293113,
   "start_xy": [
    276431.08539064263,
    344411.60561666853
   ],
   "end_xy": [
    276430.8978650667,
    344361.85983802273
   ]
  },
  "min_100m": {
   "gradient_pct": -3.768075198614895,
   "start_distance_m": 3696.0,
   "end_distance_m": 3796.0,
   "midpoint_distance_m": 3746.0,
   "start_elevation_m": 474.8908724942394,
   "end_elevation_m": 471.1227972956245,
   "start_xy": [
    276424.9894924391,
    344447.085748255
   ],
   "end_xy": [
    276429.99815817643,
    344347.88877906394
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.43290206780796,
   "start_distance_m": 1692.0,
   "end_distance_m": 1694.0,
   "midpoint_distance_m": 1693.0,
   "start_elevation_m": 318.8259190089221,
   "end_elevation_m": 319.53457705027824,
   "start_xy": [
    276732.98237380775,
    346328.8158927463
   ],
   "end_xy": [
    276732.56459408306,
    346326.86001448677
   ]
  },
  "max_3m": {
   "gradient_pct": 29.781996383542264,
   "start_distance_m": 1801.0,
   "end_distance_m": 1804.0,
   "midpoint_distance_m": 1802.5,
   "start_elevation_m": 332.51546198441116,
   "end_elevation_m": 333.40892187591743,
   "start_xy": [
    276703.8013510195,
    346224.2663100316
   ],
   "end_xy": [
    276702.3685094254,
    346221.63060099474
   ]
  }
 },
 "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": 0.027,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": [],
   "minima_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "minima_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.04,
   "windows_resited": [
    2.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "texture_windows": {
   "rounds": 2,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 995.0,
     "end_m": 1020.0,
     "raw_pct": 20.91,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 995.0,
     "end_m": 1015.0,
     "raw_pct": 21.03,
     "reason": "hump"
    },
    {
     "window_m": 25.0,
     "start_m": 690.0,
     "end_m": 715.0,
     "raw_pct": 17.65,
     "reason": "hump+mask-edge"
    },
    {
     "window_m": 20.0,
     "start_m": 690.0,
     "end_m": 710.0,
     "raw_pct": 19.22,
     "reason": "hump+mask-edge"
    },
    {
     "window_m": 10.0,
     "start_m": 690.0,
     "end_m": 700.0,
     "raw_pct": 24.34,
     "reason": "hump+mask-edge"
    }
   ],
   "advisory": [],
   "unresolved": [],
   "unstable": [
    {
     "window_m": 10.0,
     "start_m": 995.0,
     "end_m": 1005.0,
     "raw_pct": 25.04,
     "reason": "hump",
     "perturbations": [
      "phase+0.000/mask+0",
      "phase+0.333/mask+1",
      "phase+0.667/mask-1"
     ],
     "perturbation_reasons": [
      "hump",
      "",
      ""
     ]
    }
   ]
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.003,
   "obstruction_max_height_m": 5.31,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    684.0,
    717.0
   ],
   [
    993.0,
    1022.0
   ],
   [
    1678.0,
    1683.0
   ],
   [
    1841.0,
    1898.0
   ],
   [
    2340.0,
    2389.0
   ]
  ],
  "review": [],
  "extent": []
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "cd1381c557ec0196a6c481fc125290b249b285c2",
   "code_git_dirty": "true",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:faa4beed0662d2f6",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "remeasure-260920-uk",
   "road_pbf": "batch-wales-chunk039.pbf",
   "region_key": "wales",
   "crs": "EPSG:27700",
   "elevation_provider_key": "wales",
   "authority": "os-open-roads",
   "registry_pbf": "wales-2026-08-11.osm.pbf"
  },
  "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_276343_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_276344_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_276345_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_276346_20220111dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_20_276347_20220111dtm.tif"
  ],
  "calculated_at": "2026-09-21T02:23:46+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/remeasure-260920/uk/batch-wales-chunk039.pbf",
  "osm_snapshot": "",
  "run_id": "remeasure-260920-uk",
  "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_276343_20220111dtm.tif",
   "wg_del_20_276344_20220111dtm.tif",
   "wg_del_20_276345_20220111dtm.tif",
   "wg_del_20_276346_20220111dtm.tif",
   "wg_del_20_276347_20220111dtm.tif"
  ],
  "elevation_capture_dates": [
   "11-01-2022"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "structure_mask_ranges_m": [
   [
    1848.6,
    1878.6
   ],
   [
    1849.1,
    1879.1
   ],
   [
    1863.9,
    1893.9
   ],
   [
    1861.3,
    1891.3
   ],
   [
    1846.8,
    1876.8
   ],
   [
    1862.2,
    1892.2
   ],
   [
    1860.4,
    1890.4
   ],
   [
    1863.6,
    1893.6
   ],
   [
    1853.8,
    1883.8
   ],
   [
    1859.0,
    1889.0
   ],
   [
    1858.7,
    1888.7
   ],
   [
    1853.8,
    1883.8
   ],
   [
    1851.4,
    1881.4
   ],
   [
    1857.4,
    1887.4
   ],
   [
    1850.3,
    1880.3
   ],
   [
    1852.1,
    1882.1
   ],
   [
    2345.7,
    2375.7
   ],
   [
    2348.4,
    2378.4
   ],
   [
    2350.0,
    2380.0
   ],
   [
    2354.2,
    2384.2
   ]
  ],
  "suppression_unstable": [
   10.0
  ],
  "carriageway": {
   "stations": 186,
   "stations_resolved": 186,
   "width_median_m": 4.25,
   "width_p10_m": 2.5,
   "width_min_m": 1.0,
   "width_max_m": 9.25,
   "bounded_share": 0.435,
   "unbounded_share": 0.565,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.75,
   "window_m": [
    814.0,
    839.0
   ],
   "width_at_max25_m": 4.25,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 186,
    "stations_resolved": 186,
    "width_median_m": 7.0,
    "width_p10_m": 4.62,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.769,
    "unbounded_share": 0.231,
    "confidence_median": 1.0,
    "width_median_bounded_m": 6.25,
    "window_m": [
     814.0,
     839.0
    ],
    "width_at_max25_m": 5.0,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "remeasured": {
   "on": "2026-09-21",
   "why": "corpus re-measure 2026-09-21: a mask that exists today reaching a page published before it did; fallers only (Peter: fold the fallers)",
   "published_max25_pct": 17.69,
   "max25_pct": 16.61
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Cwm Penmachno",
  "county": "Conwy - Conwy"
 }
}