{
 "ocl_version": "0.1.0",
 "name": "Lane near Garthbeibio",
 "slug": "discovered-lane-52-6953-3-5021",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 52.11533066504472,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 115.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 195.2592711184974,
   "end_elevation_m": 196.3015777317983,
   "min_gradient_pct": -14.56988885560122
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 47.51212439074569,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 115.0,
   "end_distance_m": 118.0,
   "start_elevation_m": 195.2592711184974,
   "end_elevation_m": 196.68463485021977,
   "min_gradient_pct": -11.303469533056424
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 40.480604027857794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 114.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 194.89102353414364,
   "end_elevation_m": 196.91505373553653,
   "min_gradient_pct": -4.413439459174242
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.846760863998384,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 113.0,
   "end_distance_m": 123.0,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 197.7627449293143,
   "min_gradient_pct": -4.1446964578577195
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.172713921728217,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 113.0,
   "end_distance_m": 133.0,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 199.5126116272601,
   "min_gradient_pct": -3.044737433964997,
   "suppressed_max_gradient_pct": 25.763801630842096,
   "suppressed_location_m": [
    151.0,
    171.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.480438714039792,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 200.5481785214244,
   "min_gradient_pct": -2.7560496883521637,
   "suppressed_max_gradient_pct": 24.87145012411247,
   "suppressed_location_m": [
    147.0,
    172.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.594302343684035,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 114.0,
   "end_distance_m": 164.0,
   "start_elevation_m": 194.89102353414364,
   "end_elevation_m": 206.18817470598566,
   "min_gradient_pct": 0.3522892387144907
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.496944632127224,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 67.0,
   "end_distance_m": 167.0,
   "start_elevation_m": 191.37748387515757,
   "end_elevation_m": 206.8744285072848,
   "min_gradient_pct": 5.514387189648119,
   "suppressed_max_gradient_pct": 20.896264171813414,
   "suppressed_location_m": [
    103.0,
    203.0
   ]
  }
 ],
 "length_m": 322.4546730826731,
 "start_elevation_m": 186.85236445228665,
 "end_elevation_m": 221.16097176110839,
 "endpoint_gain_m": 34.308607308821735,
 "overall_gradient_pct": 10.639823259756406,
 "accumulated_ascent_m": 36.89209280686998,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 40.480604027857794,
   "start_distance_m": 114.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 116.5,
   "start_elevation_m": 194.89102353414364,
   "end_elevation_m": 196.91505373553653,
   "start_xy": [
    298724.1118010274,
    311880.97486169706
   ],
   "end_xy": [
    298720.01882456976,
    311883.84671540465
   ]
  },
  "max_10m": {
   "gradient_pct": 30.846760863998384,
   "start_distance_m": 113.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 118.0,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 197.7627449293143,
   "start_xy": [
    298724.5505843571,
    311880.23775067856
   ],
   "end_xy": [
    298716.74444340373,
    311886.1441983707
   ]
  },
  "max_20m": {
   "gradient_pct": 24.172713921728217,
   "start_distance_m": 113.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 199.5126116272601,
   "start_xy": [
    298724.5505843571,
    311880.23775067856
   ],
   "end_xy": [
    298707.76857367664,
    311890.5399128883
   ]
  },
  "max_25m": {
   "gradient_pct": 23.480438714039792,
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 125.5,
   "start_elevation_m": 194.67806884291446,
   "end_elevation_m": 200.5481785214244,
   "start_xy": [
    298724.5505843571,
    311880.23775067856
   ],
   "end_xy": [
    298703.2626053322,
    311892.70699601516
   ]
  },
  "max_50m": {
   "gradient_pct": 22.594302343684035,
   "start_distance_m": 114.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 139.0,
   "start_elevation_m": 194.89102353414364,
   "end_elevation_m": 206.18817470598566,
   "start_xy": [
    298724.1118010274,
    311880.97486169706
   ],
   "end_xy": [
    298679.8315699409,
    311903.9758282747
   ]
  },
  "max_100m": {
   "gradient_pct": 15.496944632127224,
   "start_distance_m": 67.0,
   "end_distance_m": 167.0,
   "midpoint_distance_m": 117.0,
   "start_elevation_m": 191.37748387515757,
   "end_elevation_m": 206.8744285072848,
   "start_xy": [
    298755.56204312056,
    311851.40958876547
   ],
   "end_xy": [
    298677.1279889342,
    311905.2760781508
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.413439459174242,
   "start_distance_m": 296.0,
   "end_distance_m": 301.0,
   "midpoint_distance_m": 298.5,
   "start_elevation_m": 221.69907767515255,
   "end_elevation_m": 221.47840570219384,
   "start_xy": [
    298551.98010446655,
    311919.8099929543
   ],
   "end_xy": [
    298547.0026155164,
    311920.2839167365
   ]
  },
  "min_10m": {
   "gradient_pct": -4.1446964578577195,
   "start_distance_m": 293.0,
   "end_distance_m": 303.0,
   "midpoint_distance_m": 298.0,
   "start_elevation_m": 221.8353660586124,
   "end_elevation_m": 221.42089641282664,
   "start_xy": [
    298554.96659783664,
    311919.52563868504
   ],
   "end_xy": [
    298545.0116199364,
    311920.47348624934
   ]
  },
  "min_20m": {
   "gradient_pct": -3.044737433964997,
   "start_distance_m": 293.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 303.0,
   "start_elevation_m": 221.8353660586124,
   "end_elevation_m": 221.2264185718194,
   "start_xy": [
    298554.96659783664,
    311919.52563868504
   ],
   "end_xy": [
    298535.13568198873,
    311921.95686085225
   ]
  },
  "min_25m": {
   "gradient_pct": -2.7560496883521637,
   "start_distance_m": 291.0,
   "end_distance_m": 316.0,
   "midpoint_distance_m": 303.5,
   "start_elevation_m": 221.86398920136233,
   "end_elevation_m": 221.1749767792743,
   "start_xy": [
    298556.95759341674,
    311919.3360691722
   ],
   "end_xy": [
    298532.1943802935,
    311922.54740664846
   ]
  },
  "min_50m": {
   "gradient_pct": 0.3522892387144907,
   "start_distance_m": 271.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 296.0,
   "start_elevation_m": 220.9742318110388,
   "end_elevation_m": 221.15037643039605,
   "start_xy": [
    298575.5585243096,
    311912.68982381275
   ],
   "end_xy": [
    298527.29221080133,
    311923.5316496421
   ]
  },
  "min_100m": {
   "gradient_pct": 5.514387189648119,
   "start_distance_m": 222.0,
   "end_distance_m": 322.0,
   "midpoint_distance_m": 272.0,
   "start_elevation_m": 215.6422222006516,
   "end_elevation_m": 221.1566093902997,
   "start_xy": [
    298623.1500582152,
    311907.498644681
   ],
   "end_xy": [
    298526.31177690293,
    311923.7284982408
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 52.11533066504472,
   "start_distance_m": 115.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 116.0,
   "start_elevation_m": 195.2592711184974,
   "end_elevation_m": 196.3015777317983,
   "start_xy": [
    298723.29320573586,
    311881.54923243856
   ],
   "end_xy": [
    298721.6560151528,
    311882.6979739216
   ]
  },
  "max_3m": {
   "gradient_pct": 47.51212439074569,
   "start_distance_m": 115.0,
   "end_distance_m": 118.0,
   "midpoint_distance_m": 116.5,
   "start_elevation_m": 195.2592711184974,
   "end_elevation_m": 196.68463485021977,
   "start_xy": [
    298723.29320573586,
    311881.54923243856
   ],
   "end_xy": [
    298720.8374198613,
    311883.2723446631
   ]
  }
 },
 "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": 0.173,
   "obstruction_max_height_m": 16.62,
   "flagged_windows_m": [
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.019,
   "windows_resited": [
    20.0,
    25.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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_8_298311_20210222dtm.tif"
  ],
  "calculated_at": "2026-08-12T01:19:14+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",
  "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_8_298311_20210222dtm.tif"
  ],
  "elevation_capture_dates": [
   "22-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.0% over 200 m (Terrain 50), gain 26.1 m over 209 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ROAD-REVIEW: way 406599938: unnamed service way; way 406599938: service way, surface untagged; way 712381960: unnamed service way; way 712381960: service way, surface untagged",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.6953, -3.5021)'"
 },
 "area": {
  "place": "Foel",
  "county": "Powys - Powys"
 },
 "reported_claims": [],
 "confidence": "U",
 "shape": {
  "ascent_concentration": 0.501,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 109.0,
  "shape_class": "stepped"
 }
}