{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.9918, -4.4082)",
 "slug": "discovered-lane-51-9918-4-4082",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.821308260858416,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 470.0,
   "end_distance_m": 472.0,
   "start_elevation_m": 130.51405006426234,
   "end_elevation_m": 131.3904762294795,
   "min_gradient_pct": -66.30934490396214,
   "suppressed_max_gradient_pct": 50.164835603656854,
   "suppressed_location_m": [
    64.0,
    66.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.078745484734476,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 470.0,
   "end_distance_m": 473.0,
   "start_elevation_m": 130.51405006426234,
   "end_elevation_m": 131.56641242880437,
   "min_gradient_pct": -53.089635539511924,
   "suppressed_max_gradient_pct": 45.78359565590896,
   "suppressed_location_m": [
    657.0,
    660.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.061427048526866,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 677.0,
   "end_distance_m": 682.0,
   "start_elevation_m": 149.63344233716154,
   "end_elevation_m": 150.93651368958788,
   "min_gradient_pct": -27.221857437349968,
   "suppressed_max_gradient_pct": 42.23105976628062,
   "suppressed_location_m": [
    656.0,
    661.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.927206319374193,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1155.0,
   "end_distance_m": 1165.0,
   "start_elevation_m": 188.8823330966681,
   "end_elevation_m": 191.07505372860552,
   "min_gradient_pct": -16.453195795601516
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.680788002691003,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1145.0,
   "end_distance_m": 1165.0,
   "start_elevation_m": 186.73889612806732,
   "end_elevation_m": 191.07505372860552,
   "min_gradient_pct": -15.033340749204172
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.29462447167623,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1140.0,
   "end_distance_m": 1165.0,
   "start_elevation_m": 185.75139761068647,
   "end_elevation_m": 191.07505372860552,
   "min_gradient_pct": -14.642282338104906
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.010392448796264,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1124.0,
   "end_distance_m": 1174.0,
   "start_elevation_m": 182.36350869773588,
   "end_elevation_m": 192.86870492213401,
   "min_gradient_pct": -10.282937461380527
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.29186740303163,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1099.0,
   "end_distance_m": 1199.0,
   "start_elevation_m": 177.49595122018155,
   "end_elevation_m": 197.78781862321318,
   "min_gradient_pct": -2.7833217894958864
  }
 ],
 "shape": {
  "ascent_concentration": 0.351,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 236.0,
  "shape_class": "sustained"
 },
 "length_m": 1318.6110672034872,
 "start_elevation_m": 106.52691086978918,
 "end_elevation_m": 214.1972517714848,
 "endpoint_gain_m": 107.67034090169561,
 "overall_gradient_pct": 8.16543585744681,
 "accumulated_ascent_m": 124.01235883556856,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.061427048526866,
   "start_distance_m": 677.0,
   "end_distance_m": 682.0,
   "midpoint_distance_m": 679.5,
   "start_elevation_m": 149.63344233716154,
   "end_elevation_m": 150.93651368958788,
   "start_xy": [
    234907.77115862074,
    235862.81918647597
   ],
   "end_xy": [
    234906.99915230405,
    235857.8791459508
   ]
  },
  "max_10m": {
   "gradient_pct": 21.927206319374193,
   "start_distance_m": 1155.0,
   "end_distance_m": 1165.0,
   "midpoint_distance_m": 1160.0,
   "start_elevation_m": 188.8823330966681,
   "end_elevation_m": 191.07505372860552,
   "start_xy": [
    234805.8647910827,
    235465.0376109545
   ],
   "end_xy": [
    234796.9486958847,
    235460.50956255416
   ]
  },
  "max_20m": {
   "gradient_pct": 21.680788002691003,
   "start_distance_m": 1145.0,
   "end_distance_m": 1165.0,
   "midpoint_distance_m": 1155.0,
   "start_elevation_m": 186.73889612806732,
   "end_elevation_m": 191.07505372860552,
   "start_xy": [
    234814.74718584868,
    235469.62991004728
   ],
   "end_xy": [
    234796.9486958847,
    235460.50956255416
   ]
  },
  "max_25m": {
   "gradient_pct": 21.29462447167623,
   "start_distance_m": 1140.0,
   "end_distance_m": 1165.0,
   "midpoint_distance_m": 1152.5,
   "start_elevation_m": 185.75139761068647,
   "end_elevation_m": 191.07505372860552,
   "start_xy": [
    234819.13791811702,
    235472.02186886096
   ],
   "end_xy": [
    234796.9486958847,
    235460.50956255416
   ]
  },
  "max_50m": {
   "gradient_pct": 21.010392448796264,
   "start_distance_m": 1124.0,
   "end_distance_m": 1174.0,
   "midpoint_distance_m": 1149.0,
   "start_elevation_m": 182.36350869773588,
   "end_elevation_m": 192.86870492213401,
   "start_xy": [
    234833.18684980558,
    235479.67872671626
   ],
   "end_xy": [
    234788.92461458943,
    235456.43352122224
   ]
  },
  "max_100m": {
   "gradient_pct": 20.29186740303163,
   "start_distance_m": 1099.0,
   "end_distance_m": 1199.0,
   "midpoint_distance_m": 1149.0,
   "start_elevation_m": 177.49595122018155,
   "end_elevation_m": 197.78781862321318,
   "start_xy": [
    234855.13513779224,
    235491.6483499471
   ],
   "end_xy": [
    234766.63536618074,
    235445.11144829585
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -27.221857437349968,
   "start_distance_m": 85.0,
   "end_distance_m": 90.0,
   "midpoint_distance_m": 87.5,
   "start_elevation_m": 108.62714951655713,
   "end_elevation_m": 107.26605664468963,
   "start_xy": [
    234867.94956350222,
    236437.93430924698
   ],
   "end_xy": [
    234868.70451792498,
    236432.99163348755
   ]
  },
  "min_10m": {
   "gradient_pct": -16.453195795601516,
   "start_distance_m": 1018.0,
   "end_distance_m": 1028.0,
   "midpoint_distance_m": 1023.0,
   "start_elevation_m": 175.91875999464494,
   "end_elevation_m": 174.2734404150848,
   "start_xy": [
    234922.4080698128,
    235533.1355169045
   ],
   "end_xy": [
    234916.13892614638,
    235525.34715227818
   ]
  },
  "min_20m": {
   "gradient_pct": -15.033340749204172,
   "start_distance_m": 1007.0,
   "end_distance_m": 1027.0,
   "midpoint_distance_m": 1017.0,
   "start_elevation_m": 177.42912845053178,
   "end_elevation_m": 174.42246030069094,
   "start_xy": [
    234929.68570549015,
    235541.3639037209
   ],
   "end_xy": [
    234916.75524102047,
    235526.13465208295
   ]
  },
  "min_25m": {
   "gradient_pct": -14.642282338104906,
   "start_distance_m": 1005.0,
   "end_distance_m": 1030.0,
   "midpoint_distance_m": 1017.5,
   "start_elevation_m": 177.643370931633,
   "end_elevation_m": 173.98280034710677,
   "start_xy": [
    234931.35129804938,
    235542.470453805
   ],
   "end_xy": [
    234914.9060671696,
    235523.772332678
   ]
  },
  "min_50m": {
   "gradient_pct": -10.282937461380527,
   "start_distance_m": 998.0,
   "end_distance_m": 1048.0,
   "midpoint_distance_m": 1023.0,
   "start_elevation_m": 178.07697872882918,
   "end_elevation_m": 172.9355099981389,
   "start_xy": [
    234937.74641220574,
    235545.18115521318
   ],
   "end_xy": [
    234901.96498872444,
    235511.31431130687
   ]
  },
  "min_100m": {
   "gradient_pct": -2.7833217894958864,
   "start_distance_m": 958.0,
   "end_distance_m": 1058.0,
   "midpoint_distance_m": 1008.0,
   "start_elevation_m": 175.15428799959682,
   "end_elevation_m": 172.37096621010093,
   "start_xy": [
    234930.7932531296,
    235584.55844000657
   ],
   "end_xy": [
    234893.34635134577,
    235506.31630452166
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.821308260858416,
   "start_distance_m": 470.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 471.0,
   "start_elevation_m": 130.51405006426234,
   "end_elevation_m": 131.3904762294795,
   "start_xy": [
    234951.53118364312,
    236063.86434820318
   ],
   "end_xy": [
    234951.5791629157,
    236061.86492379202
   ]
  },
  "max_3m": {
   "gradient_pct": 35.078745484734476,
   "start_distance_m": 470.0,
   "end_distance_m": 473.0,
   "midpoint_distance_m": 471.5,
   "start_elevation_m": 130.51405006426234,
   "end_elevation_m": 131.56641242880437,
   "start_xy": [
    234951.53118364312,
    236063.86434820318
   ],
   "end_xy": [
    234951.60218746652,
    236060.8651888958
   ]
  }
 },
 "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": 0.071,
   "windows_resited": [
    2.0
   ],
   "windows_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.086,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 2,
   "windows_masked": [
    {
     "window_m": 5.0,
     "start_m": 656.0,
     "end_m": 661.0,
     "raw_pct": 42.23,
     "reason": "hump"
    },
    {
     "window_m": 5.0,
     "start_m": 665.0,
     "end_m": 670.0,
     "raw_pct": 29.48,
     "reason": "mask-edge+short-step"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.4,
   "obstruction_max_height_m": 33.15,
   "flagged_windows_m": [
    2,
    3
   ]
  },
  "excluded_ranges_m": [
   [
    65.0,
    70.0
   ],
   [
    357.0,
    397.0
   ],
   [
    514.0,
    554.0
   ],
   [
    648.0,
    672.0
   ]
  ],
  "review": [],
  "extent": [
   "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_14_234235_20210321dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_14_234236_20210321dtm.tif"
  ],
  "calculated_at": "2026-09-15T21:26:31+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-260915-dogleg-all",
  "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_14_234235_20210321dtm.tif",
   "wg_del_14_234236_20210321dtm.tif"
  ],
  "elevation_capture_dates": [
   "21-03-2021"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "structure_mask_ranges_m": [
   [
    362.1,
    392.1
   ],
   [
    519.9,
    549.9
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Cwmpengraig",
  "county": "Sir Gaerfyrddin - Carmarthenshire"
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    1009.0,
    1166.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}