{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (52.6545, -4.0923)",
 "slug": "discovered-lane-52-6545-4-0923",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.79254814826842,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 598.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 103.59430840412546,
   "end_elevation_m": 104.35015936709082,
   "min_gradient_pct": -9.495686098124345,
   "suppressed_max_gradient_pct": 45.89491234774101,
   "suppressed_location_m": [
    433.0,
    435.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.614467888148646,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 597.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 103.34172533044637,
   "end_elevation_m": 104.35015936709082,
   "min_gradient_pct": -8.927663025516708,
   "suppressed_max_gradient_pct": 42.094442255380216,
   "suppressed_location_m": [
    432.0,
    435.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.539931215516845,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 595.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 102.82316280631498,
   "end_elevation_m": 104.35015936709082,
   "min_gradient_pct": -8.116055058133398,
   "suppressed_max_gradient_pct": 35.71026197428381,
   "suppressed_location_m": [
    432.0,
    437.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.953439141860855,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 592.0,
   "end_distance_m": 602.0,
   "start_elevation_m": 102.33644132198638,
   "end_elevation_m": 104.73178523617247,
   "min_gradient_pct": -7.771298314716724,
   "suppressed_max_gradient_pct": 30.179602874570293,
   "suppressed_location_m": [
    428.0,
    438.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.054696257729503,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 406.0,
   "start_elevation_m": 62.59867181623349,
   "end_elevation_m": 67.20961106777939,
   "min_gradient_pct": -5.798858930293793,
   "suppressed_max_gradient_pct": 26.45609884030577,
   "suppressed_location_m": [
    418.0,
    438.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.14041154805449,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 411.0,
   "start_elevation_m": 62.59867181623349,
   "end_elevation_m": 68.38377470324711,
   "min_gradient_pct": -4.781894806817519,
   "suppressed_max_gradient_pct": 25.60701981041666,
   "suppressed_location_m": [
    413.0,
    438.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.885851678462544,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 379.0,
   "end_distance_m": 429.0,
   "start_elevation_m": 61.04909113113515,
   "end_elevation_m": 72.49201697036642,
   "min_gradient_pct": -1.6185337189980942,
   "suppressed_max_gradient_pct": 24.308251506697644,
   "suppressed_location_m": [
    388.0,
    438.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.951147911393388,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 331.0,
   "end_distance_m": 431.0,
   "start_elevation_m": 51.93724495214426,
   "end_elevation_m": 72.88839286353765,
   "min_gradient_pct": 3.462702200192758,
   "suppressed_max_gradient_pct": 22.043681782816,
   "suppressed_location_m": [
    362.0,
    462.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.322,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 338.0,
  "shape_class": "sustained"
 },
 "length_m": 886.4866681193163,
 "start_elevation_m": 17.040606643296492,
 "end_elevation_m": 153.4286110109715,
 "endpoint_gain_m": 136.38800436767502,
 "overall_gradient_pct": 15.385229047721893,
 "accumulated_ascent_m": 138.060195041427,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.539931215516845,
   "start_distance_m": 595.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 597.5,
   "start_elevation_m": 102.82316280631498,
   "end_elevation_m": 104.35015936709082,
   "start_xy": [
    258525.42915940998,
    308366.98957692453
   ],
   "end_xy": [
    258530.42812179998,
    308367.0914058418
   ]
  },
  "max_10m": {
   "gradient_pct": 23.953439141860855,
   "start_distance_m": 592.0,
   "end_distance_m": 602.0,
   "midpoint_distance_m": 597.0,
   "start_elevation_m": 102.33644132198638,
   "end_elevation_m": 104.73178523617247,
   "start_xy": [
    258522.53135840988,
    308367.69591196976
   ],
   "end_xy": [
    258532.42771808972,
    308367.1315850799
   ]
  },
  "max_20m": {
   "gradient_pct": 23.054696257729503,
   "start_distance_m": 386.0,
   "end_distance_m": 406.0,
   "midpoint_distance_m": 396.0,
   "start_elevation_m": 62.59867181623349,
   "end_elevation_m": 67.20961106777939,
   "start_xy": [
    258382.03531175698,
    308513.1242436807
   ],
   "end_xy": [
    258396.86249592665,
    308499.70207713376
   ]
  },
  "max_25m": {
   "gradient_pct": 23.14041154805449,
   "start_distance_m": 386.0,
   "end_distance_m": 411.0,
   "midpoint_distance_m": 398.5,
   "start_elevation_m": 62.59867181623349,
   "end_elevation_m": 68.38377470324711,
   "start_xy": [
    258382.03531175698,
    308513.1242436807
   ],
   "end_xy": [
    258400.56908886766,
    308496.3463108904
   ]
  },
  "max_50m": {
   "gradient_pct": 22.885851678462544,
   "start_distance_m": 379.0,
   "end_distance_m": 429.0,
   "midpoint_distance_m": 404.0,
   "start_elevation_m": 61.04909113113515,
   "end_elevation_m": 72.49201697036642,
   "start_xy": [
    258376.84608250507,
    308517.822316652
   ],
   "end_xy": [
    258413.25866980018,
    308483.6003338885
   ]
  },
  "max_100m": {
   "gradient_pct": 20.951147911393388,
   "start_distance_m": 331.0,
   "end_distance_m": 431.0,
   "midpoint_distance_m": 381.0,
   "start_elevation_m": 51.93724495214426,
   "end_elevation_m": 72.88839286353765,
   "start_xy": [
    258345.27641820948,
    308553.7174571924
   ],
   "end_xy": [
    258414.62458825033,
    308482.13942105015
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.116055058133398,
   "start_distance_m": 28.0,
   "end_distance_m": 33.0,
   "midpoint_distance_m": 30.5,
   "start_elevation_m": 17.107603119660325,
   "end_elevation_m": 16.701800366753655,
   "start_xy": [
    258189.40520975145,
    308756.05713661166
   ],
   "end_xy": [
    258193.55235334826,
    308758.8501982189
   ]
  },
  "min_10m": {
   "gradient_pct": -7.771298314716724,
   "start_distance_m": 25.0,
   "end_distance_m": 35.0,
   "midpoint_distance_m": 30.0,
   "start_elevation_m": 17.360132898404462,
   "end_elevation_m": 16.58300306693279,
   "start_xy": [
    258186.91708867738,
    308754.38105497067
   ],
   "end_xy": [
    258195.21135955374,
    308759.9672023983
   ]
  },
  "min_20m": {
   "gradient_pct": -5.798858930293793,
   "start_distance_m": 21.0,
   "end_distance_m": 41.0,
   "midpoint_distance_m": 31.0,
   "start_elevation_m": 17.52840983568032,
   "end_elevation_m": 16.368638049621563,
   "start_xy": [
    258183.5990770393,
    308752.147047123
   ],
   "end_xy": [
    258199.9914919207,
    308763.5781287524
   ]
  },
  "min_25m": {
   "gradient_pct": -4.781894806817519,
   "start_distance_m": 15.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 27.5,
   "start_elevation_m": 17.583121188736172,
   "end_elevation_m": 16.387647487031792,
   "start_xy": [
    258177.82451865156,
    308751.5110269825
   ],
   "end_xy": [
    258199.23660161972,
    308762.9222776987
   ]
  },
  "min_50m": {
   "gradient_pct": -1.6185337189980942,
   "start_distance_m": 10.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 35.0,
   "start_elevation_m": 17.35119256437296,
   "end_elevation_m": 16.54192570487391,
   "start_xy": [
    258172.83236215782,
    308751.7909796989
   ],
   "end_xy": [
    258214.3947393252,
    308775.9676918975
   ]
  },
  "min_100m": {
   "gradient_pct": 3.462702200192758,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 17.040606643296492,
   "end_elevation_m": 20.50330884348925,
   "start_xy": [
    258162.848,
    308752.35
   ],
   "end_xy": [
    258242.63655259134,
    308755.1683036378
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.79254814826842,
   "start_distance_m": 598.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 599.0,
   "start_elevation_m": 103.59430840412546,
   "end_elevation_m": 104.35015936709082,
   "start_xy": [
    258528.42854223974,
    308367.0504108448
   ],
   "end_xy": [
    258530.42812179998,
    308367.0914058418
   ]
  },
  "max_3m": {
   "gradient_pct": 33.614467888148646,
   "start_distance_m": 597.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 598.5,
   "start_elevation_m": 103.34172533044637,
   "end_elevation_m": 104.35015936709082,
   "start_xy": [
    258527.42874217973,
    308367.0304148436
   ],
   "end_xy": [
    258530.42812179998,
    308367.0914058418
   ]
  }
 },
 "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": 0.007,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.194,
   "obstruction_max_height_m": 14.38,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    432.0,
    437.0
   ]
  ],
  "review": [],
  "extent": [
   "may_continue_beyond_end"
  ]
 },
 "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-chunk036.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_34_258308_20220114dtm.tif"
  ],
  "calculated_at": "2026-09-21T02:23:56+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/remeasure-260920/uk/batch-wales-chunk036.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_34_258308_20220114dtm.tif"
  ],
  "elevation_capture_dates": [
   "14-01-2022"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "carriageway": {
   "stations": 42,
   "stations_resolved": 42,
   "width_median_m": 3.0,
   "width_p10_m": 2.25,
   "width_min_m": 1.25,
   "width_max_m": 7.75,
   "bounded_share": 0.333,
   "unbounded_share": 0.667,
   "confidence_median": 0.0,
   "width_median_bounded_m": 2.5,
   "window_m": [
    386.0,
    411.0
   ],
   "width_at_max25_m": 3.5,
   "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": 42,
    "stations_resolved": 42,
    "width_median_m": 3.38,
    "width_p10_m": 1.0,
    "width_min_m": 0.75,
    "width_max_m": 12.0,
    "bounded_share": 0.905,
    "unbounded_share": 0.095,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.12,
    "window_m": [
     386.0,
     411.0
    ],
    "width_at_max25_m": 2.0,
    "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": 25.58,
   "max25_pct": 23.14
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Llangelynin",
  "county": "Gwynedd - Gwynedd"
 }
}