{
 "ocl_version": "0.1.0",
 "name": "Lane near Llangadfan",
 "slug": "discovered-lane-52-6948-3-4448",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 36.19708785580826,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 114.0,
   "end_distance_m": 116.0,
   "start_elevation_m": 215.01642077183877,
   "end_elevation_m": 215.74036252895493,
   "min_gradient_pct": -10.091995950857324
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.07758548970139,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 114.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 215.01642077183877,
   "end_elevation_m": 216.0987483365298,
   "min_gradient_pct": -9.168658783449738
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.21066988049347,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 112.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 214.38821484250514,
   "end_elevation_m": 216.0987483365298,
   "min_gradient_pct": -6.600753111072208
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.541669135523534,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 109.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 213.46206251018856,
   "end_elevation_m": 216.7162294237409,
   "min_gradient_pct": -5.710416198299697
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.2813288984714,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 99.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 211.05996364404663,
   "end_elevation_m": 216.7162294237409,
   "min_gradient_pct": -3.2028249605495773
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.320614046092487,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 94.0,
   "end_distance_m": 119.0,
   "start_elevation_m": 209.8860759122178,
   "end_elevation_m": 216.7162294237409,
   "min_gradient_pct": -2.5346746032212195
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.77994125018773,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 70.0,
   "end_distance_m": 120.0,
   "start_elevation_m": 204.96093853420663,
   "end_elevation_m": 216.8509091593005,
   "min_gradient_pct": -1.5146819210224862
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.10799036992188,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 199.50964200532553,
   "end_elevation_m": 219.6176323752474,
   "min_gradient_pct": 1.7368876517515162
  }
 ],
 "length_m": 545.6070381152059,
 "start_elevation_m": 196.26565030786134,
 "end_elevation_m": 252.1215610504152,
 "endpoint_gain_m": 55.855910742553874,
 "overall_gradient_pct": 10.237388237422223,
 "accumulated_ascent_m": 58.93031836489962,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.21066988049347,
   "start_distance_m": 112.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 114.5,
   "start_elevation_m": 214.38821484250514,
   "end_elevation_m": 216.0987483365298,
   "start_xy": [
    302385.13775731385,
    311703.0582226989
   ],
   "end_xy": [
    302390.109742874,
    311703.5867674843
   ]
  },
  "max_10m": {
   "gradient_pct": 32.541669135523534,
   "start_distance_m": 109.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 114.0,
   "start_elevation_m": 213.46206251018856,
   "end_elevation_m": 216.7162294237409,
   "start_xy": [
    302382.1545659778,
    311702.74109582766
   ],
   "end_xy": [
    302392.098537098,
    311703.7981853985
   ]
  },
  "max_20m": {
   "gradient_pct": 28.2813288984714,
   "start_distance_m": 99.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 109.0,
   "start_elevation_m": 211.05996364404663,
   "end_elevation_m": 216.7162294237409,
   "start_xy": [
    302372.21059485764,
    311701.6840062568
   ],
   "end_xy": [
    302392.098537098,
    311703.7981853985
   ]
  },
  "max_25m": {
   "gradient_pct": 27.320614046092487,
   "start_distance_m": 94.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 106.5,
   "start_elevation_m": 209.8860759122178,
   "end_elevation_m": 216.7162294237409,
   "start_xy": [
    302367.2386092975,
    311701.1554614714
   ],
   "end_xy": [
    302392.098537098,
    311703.7981853985
   ]
  },
  "max_50m": {
   "gradient_pct": 23.77994125018773,
   "start_distance_m": 70.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 95.0,
   "start_elevation_m": 204.96093853420663,
   "end_elevation_m": 216.8509091593005,
   "start_xy": [
    302343.3910187305,
    311698.4668138968
   ],
   "end_xy": [
    302393.09293421,
    311703.9038943556
   ]
  },
  "max_100m": {
   "gradient_pct": 20.10799036992188,
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 90.0,
   "start_elevation_m": 199.50964200532553,
   "end_elevation_m": 219.6176323752474,
   "start_xy": [
    302316.1789058052,
    311686.8848361179
   ],
   "end_xy": [
    302412.6380653017,
    311707.7763354133
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.600753111072208,
   "start_distance_m": 372.0,
   "end_distance_m": 377.0,
   "midpoint_distance_m": 374.5,
   "start_elevation_m": 246.37172616715262,
   "end_elevation_m": 246.041688511599,
   "start_xy": [
    302550.3377229436,
    311876.7692669396
   ],
   "end_xy": [
    302546.9376548588,
    311880.4153611351
   ]
  },
  "min_10m": {
   "gradient_pct": -5.710416198299697,
   "start_distance_m": 348.0,
   "end_distance_m": 358.0,
   "midpoint_distance_m": 353.0,
   "start_elevation_m": 246.6618619578637,
   "end_elevation_m": 246.09082033803372,
   "start_xy": [
    302551.4824316235,
    311855.3799992841
   ],
   "end_xy": [
    302555.3777964205,
    311864.0535462607
   ]
  },
  "min_20m": {
   "gradient_pct": -3.2028249605495773,
   "start_distance_m": 347.0,
   "end_distance_m": 367.0,
   "midpoint_distance_m": 357.0,
   "start_elevation_m": 246.69205773270494,
   "end_elevation_m": 246.05149274059502,
   "start_xy": [
    302550.6915271331,
    311854.76805967354
   ],
   "end_xy": [
    302552.8085638075,
    311872.42243528593
   ]
  },
  "min_25m": {
   "gradient_pct": -2.5346746032212195,
   "start_distance_m": 342.0,
   "end_distance_m": 367.0,
   "midpoint_distance_m": 354.5,
   "start_elevation_m": 246.68516139140033,
   "end_elevation_m": 246.05149274059502,
   "start_xy": [
    302546.737004681,
    311851.70836162043
   ],
   "end_xy": [
    302552.8085638075,
    311872.42243528593
   ]
  },
  "min_50m": {
   "gradient_pct": -1.5146819210224862,
   "start_distance_m": 343.0,
   "end_distance_m": 393.0,
   "midpoint_distance_m": 368.0,
   "start_elevation_m": 246.76442962773294,
   "end_elevation_m": 246.0070886672217,
   "start_xy": [
    302547.5279091715,
    311852.32030123106
   ],
   "end_xy": [
    302535.23110631626,
    311891.30856607633
   ]
  },
  "min_100m": {
   "gradient_pct": 1.7368876517515162,
   "start_distance_m": 337.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 246.4987293733693,
   "end_elevation_m": 248.2356170251208,
   "start_xy": [
    302542.78248222894,
    311848.6486635674
   ],
   "end_xy": [
    302557.4591277029,
    311922.2457017366
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 36.19708785580826,
   "start_distance_m": 114.0,
   "end_distance_m": 116.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 215.01642077183877,
   "end_elevation_m": 215.74036252895493,
   "start_xy": [
    302387.1265515379,
    311703.26964061306
   ],
   "end_xy": [
    302389.11534576194,
    311703.48105852725
   ]
  },
  "max_3m": {
   "gradient_pct": 36.07758548970139,
   "start_distance_m": 114.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 115.5,
   "start_elevation_m": 215.01642077183877,
   "end_elevation_m": 216.0987483365298,
   "start_xy": [
    302387.1265515379,
    311703.26964061306
   ],
   "end_xy": [
    302390.109742874,
    311703.5867674843
   ]
  }
 },
 "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": 0.166,
   "obstruction_max_height_m": 16.57,
   "flagged_windows_m": [
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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_302311_20210222dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_8_302312_20210222dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:08:58+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_302311_20210222dtm.tif",
   "wg_del_8_302312_20210222dtm.tif"
  ],
  "elevation_capture_dates": [
   "22-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.5% over 200 m (Terrain 50), gain 52.7 m over 497 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): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (52.6948, -3.4448)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.6948, -3.4448)'"
 },
 "area": {
  "place": "Llangadfan",
  "county": "Powys - Powys"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.432,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 144.0,
  "shape_class": "sustained"
 }
}