{
 "ocl_version": "0.1.0",
 "name": "Lane near Dolgellau",
 "slug": "discovered-lane-52-7468-3-8823",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.480988651858524,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 155.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 41.20740992517664,
   "end_elevation_m": 41.65702969821381,
   "min_gradient_pct": -1.8598186056347998
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.822718720088357,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 154.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 41.00234813661116,
   "end_elevation_m": 41.65702969821381,
   "min_gradient_pct": 0.08085253215147266
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.27201324727011,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 152.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 40.593429035850306,
   "end_elevation_m": 41.65702969821381,
   "min_gradient_pct": 2.0361002072342416
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.495523643031177,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 193.0,
   "end_distance_m": 203.0,
   "start_elevation_m": 48.36976779840013,
   "end_elevation_m": 50.41932016270325,
   "min_gradient_pct": 3.9368261816766648
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.321757055321186,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 193.0,
   "end_distance_m": 213.0,
   "start_elevation_m": 48.36976779840013,
   "end_elevation_m": 52.43411920946437,
   "min_gradient_pct": 6.180456878344831
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.317088449731557,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 194.0,
   "end_distance_m": 219.0,
   "start_elevation_m": 48.58746239326027,
   "end_elevation_m": 53.66673450569316,
   "min_gradient_pct": 7.369868916572472
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.91235866292226,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 182.0,
   "end_distance_m": 232.0,
   "start_elevation_m": 46.24305518047782,
   "end_elevation_m": 56.19923451193895,
   "min_gradient_pct": 9.388487451960636
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.5867647351079,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "start_elevation_m": 35.83383896623769,
   "end_elevation_m": 55.42060370134559,
   "min_gradient_pct": 10.459127260893283
  }
 ],
 "length_m": 234.0884754588973,
 "start_elevation_m": 21.04543968810978,
 "end_elevation_m": 56.492843956907905,
 "endpoint_gain_m": 35.447404268798124,
 "overall_gradient_pct": 15.142737889726739,
 "accumulated_ascent_m": 35.48460064091082,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.27201324727011,
   "start_distance_m": 152.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 154.5,
   "start_elevation_m": 40.593429035850306,
   "end_elevation_m": 41.65702969821381,
   "start_xy": [
    273084.8338356738,
    318248.4593969558
   ],
   "end_xy": [
    273089.6671887272,
    318249.72776352306
   ]
  },
  "max_10m": {
   "gradient_pct": 20.495523643031177,
   "start_distance_m": 193.0,
   "end_distance_m": 203.0,
   "midpoint_distance_m": 198.0,
   "start_elevation_m": 48.36976779840013,
   "end_elevation_m": 50.41932016270325,
   "start_xy": [
    273120.37964602094,
    318267.37853195803
   ],
   "end_xy": [
    273127.8312133125,
    318274.04742578673
   ]
  },
  "max_20m": {
   "gradient_pct": 20.321757055321186,
   "start_distance_m": 193.0,
   "end_distance_m": 213.0,
   "midpoint_distance_m": 203.0,
   "start_elevation_m": 48.36976779840013,
   "end_elevation_m": 52.43411920946437,
   "start_xy": [
    273120.37964602094,
    318267.37853195803
   ],
   "end_xy": [
    273135.2827806041,
    318280.7163196155
   ]
  },
  "max_25m": {
   "gradient_pct": 20.317088449731557,
   "start_distance_m": 194.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 206.5,
   "start_elevation_m": 48.58746239326027,
   "end_elevation_m": 53.66673450569316,
   "start_xy": [
    273121.12480275007,
    318268.0454213409
   ],
   "end_xy": [
    273139.75372097903,
    318284.71765591274
   ]
  },
  "max_50m": {
   "gradient_pct": 19.91235866292226,
   "start_distance_m": 182.0,
   "end_distance_m": 232.0,
   "midpoint_distance_m": 207.0,
   "start_elevation_m": 46.24305518047782,
   "end_elevation_m": 56.19923451193895,
   "start_xy": [
    273112.1829220002,
    318260.0427487464
   ],
   "end_xy": [
    273149.4407584581,
    318293.3872178901
   ]
  },
  "max_100m": {
   "gradient_pct": 19.5867647351079,
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 35.83383896623769,
   "end_elevation_m": 55.42060370134559,
   "start_xy": [
    273061.09499394096,
    318245.02764865773
   ],
   "end_xy": [
    273146.4601315415,
    318290.7196603586
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.0361002072342416,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 21.147244698471493,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273094.0794897542,
    318153.4505986182
   ]
  },
  "min_10m": {
   "gradient_pct": 3.9368261816766648,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 21.439122306277447,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273090.77297950845,
    318157.2011972363
   ]
  },
  "min_20m": {
   "gradient_pct": 6.180456878344831,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 22.281531063778747,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273084.1599590169,
    318164.70239447267
   ]
  },
  "min_25m": {
   "gradient_pct": 7.369868916572472,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 22.8879069172529,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273080.8534487711,
    318168.45299309085
   ]
  },
  "min_50m": {
   "gradient_pct": 9.388487451960636,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 25.7396834140901,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273064.5667730541,
    318187.40021023294
   ]
  },
  "min_100m": {
   "gradient_pct": 10.459127260893283,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 21.04543968810978,
   "end_elevation_m": 31.504566949003063,
   "start_xy": [
    273097.386,
    318149.7
   ],
   "end_xy": [
    273041.97810422006,
    318231.37369267823
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.480988651858524,
   "start_distance_m": 155.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 156.0,
   "start_elevation_m": 41.20740992517664,
   "end_elevation_m": 41.65702969821381,
   "start_xy": [
    273087.74047815095,
    318249.19130629697
   ],
   "end_xy": [
    273089.6671887272,
    318249.72776352306
   ]
  },
  "max_3m": {
   "gradient_pct": 21.822718720088357,
   "start_distance_m": 154.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 155.5,
   "start_elevation_m": 41.00234813661116,
   "end_elevation_m": 41.65702969821381,
   "start_xy": [
    273086.7771228628,
    318248.92307768395
   ],
   "end_xy": [
    273089.6671887272,
    318249.72776352306
   ]
  }
 },
 "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": 0.0,
   "obstruction_max_height_m": 0.22,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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_22_273318_20220114dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:09:03+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_22_273318_20220114dtm.tif"
  ],
  "elevation_capture_dates": [
   "14-01-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.0% over 200 m (Terrain 50), gain 24.1 m over 181 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): clean-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.7468, -3.8823)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.7468, -3.8823)'"
 },
 "area": {
  "place": "Dolgellau",
  "county": "Gwynedd - Gwynedd"
 },
 "reported_claims": [],
 "confidence": "A",
 "shape": {
  "ascent_concentration": 0.328,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 169.0,
  "shape_class": "sustained"
 }
}