{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (52.3768, -4.0125)",
 "slug": "discovered-lane-52-3768-4-0125",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.62946650104783,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 203.0,
   "end_distance_m": 205.0,
   "start_elevation_m": 135.86677093148825,
   "end_elevation_m": 136.4593602615092,
   "min_gradient_pct": -0.3840335406735562
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.080615923645798,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 202.0,
   "end_distance_m": 205.0,
   "start_elevation_m": 135.58694178379983,
   "end_elevation_m": 136.4593602615092,
   "min_gradient_pct": 0.5827124339025621
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.62780405616411,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 162.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 126.73163896940866,
   "end_elevation_m": 128.11302917221687,
   "min_gradient_pct": 1.5552257185666463
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.1583271410438,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 157.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 125.39719645811249,
   "end_elevation_m": 128.11302917221687,
   "min_gradient_pct": 3.6149487341864983
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.410469394838003,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 147.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 122.83093529324927,
   "end_elevation_m": 128.11302917221687,
   "min_gradient_pct": 3.620118289489085
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.178686443645574,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 151.0,
   "end_distance_m": 176.0,
   "start_elevation_m": 123.86310321687205,
   "end_elevation_m": 130.40777482778344,
   "min_gradient_pct": 4.281987377025416
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 25.10400921668335,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 130.0,
   "end_distance_m": 180.0,
   "start_elevation_m": 118.81889155210628,
   "end_elevation_m": 131.37089616044796,
   "min_gradient_pct": 4.511344594033886
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.23639374129044,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 108.0,
   "end_distance_m": 208.0,
   "start_elevation_m": 114.76658933708626,
   "end_elevation_m": 137.0029830783767,
   "min_gradient_pct": 7.794017891957964
  }
 ],
 "shape": {
  "ascent_concentration": 0.418,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 126.0,
  "shape_class": "sustained"
 },
 "length_m": 211.35345481671652,
 "start_elevation_m": 105.57529425512263,
 "end_elevation_m": 137.06304476922745,
 "endpoint_gain_m": 31.487750514104818,
 "overall_gradient_pct": 14.898148005865654,
 "accumulated_ascent_m": 31.709777867185608,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.62780405616411,
   "start_distance_m": 162.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 164.5,
   "start_elevation_m": 126.73163896940866,
   "end_elevation_m": 128.11302917221687,
   "start_xy": [
    263127.7078333087,
    277366.85865022073
   ],
   "end_xy": [
    263125.1670124179,
    277362.5523497871
   ]
  },
  "max_10m": {
   "gradient_pct": 27.1583271410438,
   "start_distance_m": 157.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 162.0,
   "start_elevation_m": 125.39719645811249,
   "end_elevation_m": 128.11302917221687,
   "start_xy": [
    263130.24874524813,
    277371.16489696584
   ],
   "end_xy": [
    263125.1670124179,
    277362.5523497871
   ]
  },
  "max_20m": {
   "gradient_pct": 26.410469394838003,
   "start_distance_m": 147.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 157.0,
   "start_elevation_m": 122.83093529324927,
   "end_elevation_m": 128.11302917221687,
   "start_xy": [
    263135.3369368442,
    277379.7735743062
   ],
   "end_xy": [
    263125.1670124179,
    277362.5523497871
   ]
  },
  "max_25m": {
   "gradient_pct": 26.178686443645574,
   "start_distance_m": 151.0,
   "end_distance_m": 176.0,
   "midpoint_distance_m": 163.5,
   "start_elevation_m": 123.86310321687205,
   "end_elevation_m": 130.40777482778344,
   "start_xy": [
    263133.2977225165,
    277376.3324622229
   ],
   "end_xy": [
    263120.59373973584,
    277354.80088762316
   ]
  },
  "max_50m": {
   "gradient_pct": 25.10400921668335,
   "start_distance_m": 130.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 155.0,
   "start_elevation_m": 118.81889155210628,
   "end_elevation_m": 131.37089616044796,
   "start_xy": [
    263145.22159205517,
    277393.6030887629
   ],
   "end_xy": [
    263118.5609839487,
    277351.35590583424
   ]
  },
  "max_100m": {
   "gradient_pct": 22.23639374129044,
   "start_distance_m": 108.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 158.0,
   "start_elevation_m": 114.76658933708626,
   "end_elevation_m": 137.0029830783767,
   "start_xy": [
    263157.8770257481,
    277411.5800368035
   ],
   "end_xy": [
    263104.3329696027,
    277327.2402772203
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 1.5552257185666463,
   "start_distance_m": 6.0,
   "end_distance_m": 11.0,
   "midpoint_distance_m": 8.5,
   "start_elevation_m": 106.72409100815779,
   "end_elevation_m": 106.80185229408612,
   "start_xy": [
    263211.4540647516,
    277491.9790651058
   ],
   "end_xy": [
    263210.7041221264,
    277487.0877118721
   ]
  },
  "min_10m": {
   "gradient_pct": 3.6149487341864983,
   "start_distance_m": 16.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 21.0,
   "start_elevation_m": 107.08661979263695,
   "end_elevation_m": 107.4481146660556,
   "start_xy": [
    263208.34005849605,
    277482.681897537
   ],
   "end_xy": [
    263202.84759916854,
    277474.3661868795
   ]
  },
  "min_20m": {
   "gradient_pct": 3.620118289489085,
   "start_distance_m": 6.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 16.0,
   "start_elevation_m": 106.72409100815779,
   "end_elevation_m": 107.4481146660556,
   "start_xy": [
    263211.4540647516,
    277491.9790651058
   ],
   "end_xy": [
    263202.84759916854,
    277474.3661868795
   ]
  },
  "min_25m": {
   "gradient_pct": 4.281987377025416,
   "start_distance_m": 6.0,
   "end_distance_m": 31.0,
   "midpoint_distance_m": 18.5,
   "start_elevation_m": 106.72409100815779,
   "end_elevation_m": 107.79458785241414,
   "start_xy": [
    263211.4540647516,
    277491.9790651058
   ],
   "end_xy": [
    263199.7767196601,
    277470.42034171306
   ]
  },
  "min_50m": {
   "gradient_pct": 4.511344594033886,
   "start_distance_m": 6.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 31.0,
   "start_elevation_m": 106.72409100815779,
   "end_elevation_m": 108.97976330517473,
   "start_xy": [
    263211.4540647516,
    277491.9790651058
   ],
   "end_xy": [
    263179.5765805053,
    277455.92004270025
   ]
  },
  "min_100m": {
   "gradient_pct": 7.794017891957964,
   "start_distance_m": 5.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 55.0,
   "start_elevation_m": 106.61420541402136,
   "end_elevation_m": 114.40822330597932,
   "start_xy": [
    263211.52405301045,
    277492.97661292047
   ],
   "end_xy": [
    263159.07053166727,
    277414.33240721235
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.62946650104783,
   "start_distance_m": 203.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 204.0,
   "start_elevation_m": 135.86677093148825,
   "end_elevation_m": 136.4593602615092,
   "start_xy": [
    263106.87379075255,
    277331.5465780092
   ],
   "end_xy": [
    263105.85774253734,
    277329.8238923714
   ]
  },
  "max_3m": {
   "gradient_pct": 29.080615923645798,
   "start_distance_m": 202.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 203.5,
   "start_elevation_m": 135.58694178379983,
   "end_elevation_m": 136.4593602615092,
   "start_xy": [
    263107.3817736609,
    277332.4079451221
   ],
   "end_xy": [
    263105.85774253734,
    277329.8238923714
   ]
  }
 },
 "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": 0.122,
   "obstruction_max_height_m": 16.18,
   "flagged_windows_m": [
    2,
    3,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "8f4becd2ed8ab26772f5cd961ca7d1d0c2823252",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "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-valley-260921-uk",
   "road_pbf": "batch-wales-chunk000.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_23_263277_20220117dtm.tif"
  ],
  "calculated_at": "2026-09-22T00:04:18+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/valley-260921/uk/batch-wales-chunk000.pbf",
  "osm_snapshot": "",
  "run_id": "remeasure-valley-260921-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_23_263277_20220117dtm.tif"
  ],
  "elevation_capture_dates": [
   "17-01-2022"
  ],
  "route_base_cut_m": 150.0,
  "climb_origin": "discovered",
  "structure_own_ways": 1,
  "structure_own_ways_source": "map-matched to the road network: the entry carried no way list, so the ways the route runs along were found by geometry (ukclimb.batch.own_ways_by_geometry)",
  "prior_doc": {
   "slug": "discovered-lane-52-3768-4-0125",
   "calculated_at": "2026-09-04T22:08:44+00:00",
   "code_git_sha": null,
   "analysis_version": "0.1.0",
   "run_id": "hunt-wales-260905",
   "path": "/root/uk-climbs/output/valley-260921/uk/priors/discovered-lane-52-3768-4-0125/discovered-lane-52-3768-4-0125.json",
   "spans": 0,
   "sources": []
  },
  "carriageway": {
   "stations": 15,
   "stations_resolved": 15,
   "width_median_m": 3.25,
   "width_p10_m": 2.2,
   "width_min_m": 1.25,
   "width_max_m": 7.25,
   "bounded_share": 0.067,
   "unbounded_share": 0.933,
   "confidence_median": 0.0,
   "width_median_bounded_m": 2.0,
   "window_m": [
    151.0,
    176.0
   ],
   "width_at_max25_m": 3.25,
   "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": 15,
    "stations_resolved": 15,
    "width_median_m": 2.75,
    "width_p10_m": 2.25,
    "width_min_m": 2.0,
    "width_max_m": 4.25,
    "bounded_share": 1.0,
    "unbounded_share": 0.0,
    "confidence_median": 1.0,
    "width_median_bounded_m": 2.75,
    "window_m": [
     151.0,
     176.0
    ],
    "width_at_max25_m": 2.75,
    "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": "2026-09-22",
   "why": "valley-crossing extent re-measure 2026-09-22: low-to-summit (150.0 m -> 360.0 m)",
   "published_max25_pct": 26.16,
   "max25_pct": 26.18
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Y Gors",
  "county": "Sir Ceredigion - Ceredigion"
 }
}