{
 "ocl_version": "0.1.0",
 "name": "Llancowrid to Goetre Hill",
 "slug": "discovered-lane-52-5191-3-1886",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.53068146521343,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded",
    "no_bench_excluded"
   ],
   "start_distance_m": 1313.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 216.80853859849998,
   "end_elevation_m": 217.55915222780425,
   "min_gradient_pct": -37.9968354692366,
   "suppressed_max_gradient_pct": 58.235396632663594,
   "suppressed_location_m": [
    1882.0,
    1884.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.0201903707557,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded",
    "no_bench_excluded"
   ],
   "start_distance_m": 1312.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 216.50854651668158,
   "end_elevation_m": 217.55915222780425,
   "min_gradient_pct": -33.13347525321338,
   "suppressed_max_gradient_pct": 52.503917315789295,
   "suppressed_location_m": [
    1881.0,
    1884.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.980496766131523,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded",
    "no_bench_excluded"
   ],
   "start_distance_m": 1313.0,
   "end_distance_m": 1318.0,
   "start_elevation_m": 216.80853859849998,
   "end_elevation_m": 218.40756343680656,
   "min_gradient_pct": -24.429846898077585,
   "suppressed_max_gradient_pct": 40.09762069596718,
   "suppressed_location_m": [
    1879.0,
    1884.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.807348674359275,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1310.0,
   "end_distance_m": 1320.0,
   "start_elevation_m": 216.12250227000573,
   "end_elevation_m": 219.10323713744165,
   "min_gradient_pct": -14.976668195123466,
   "suppressed_max_gradient_pct": 31.99920103717716,
   "suppressed_location_m": [
    1878.0,
    1888.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.927348701944567,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1306.0,
   "end_distance_m": 1326.0,
   "start_elevation_m": 214.96349990400861,
   "end_elevation_m": 220.34896964439753,
   "min_gradient_pct": -11.193370668142961,
   "suppressed_max_gradient_pct": 27.252939158375966,
   "suppressed_location_m": [
    1881.0,
    1901.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.38068184738586,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1306.0,
   "end_distance_m": 1331.0,
   "start_elevation_m": 214.96349990400861,
   "end_elevation_m": 221.55867036585508,
   "min_gradient_pct": -11.049854712137403
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.922078365503353,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1292.0,
   "end_distance_m": 1342.0,
   "start_elevation_m": 212.39992579240126,
   "end_elevation_m": 223.36096497515294,
   "min_gradient_pct": -10.064077992286457
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.463492169881846,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1243.0,
   "end_distance_m": 1343.0,
   "start_elevation_m": 206.0282197071308,
   "end_elevation_m": 223.49171187701265,
   "min_gradient_pct": -8.652421590868641
  }
 ],
 "length_m": 2355.37145844582,
 "start_elevation_m": 181.32420536880272,
 "end_elevation_m": 280.9719497822255,
 "endpoint_gain_m": 99.6477444134228,
 "overall_gradient_pct": 4.230659417057506,
 "accumulated_ascent_m": 146.43009809268113,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.980496766131523,
   "start_distance_m": 1313.0,
   "end_distance_m": 1318.0,
   "midpoint_distance_m": 1315.5,
   "start_elevation_m": 216.80853859849998,
   "end_elevation_m": 218.40756343680656,
   "start_xy": [
    319297.0139786288,
    292099.0718089461
   ],
   "end_xy": [
    319292.29165855004,
    292100.71488322126
   ]
  },
  "max_10m": {
   "gradient_pct": 29.807348674359275,
   "start_distance_m": 1310.0,
   "end_distance_m": 1320.0,
   "midpoint_distance_m": 1315.0,
   "start_elevation_m": 216.12250227000573,
   "end_elevation_m": 219.10323713744165,
   "start_xy": [
    319299.97057470796,
    292098.5797640527
   ],
   "end_xy": [
    319290.40273051854,
    292101.37211293133
   ]
  },
  "max_20m": {
   "gradient_pct": 26.927348701944567,
   "start_distance_m": 1306.0,
   "end_distance_m": 1326.0,
   "midpoint_distance_m": 1316.0,
   "start_elevation_m": 214.96349990400861,
   "end_elevation_m": 220.34896964439753,
   "start_xy": [
    319303.92312384315,
    292097.9654715052
   ],
   "end_xy": [
    319284.8032793267,
    292103.4663662078
   ]
  },
  "max_25m": {
   "gradient_pct": 26.38068184738586,
   "start_distance_m": 1306.0,
   "end_distance_m": 1331.0,
   "midpoint_distance_m": 1318.5,
   "start_elevation_m": 214.96349990400861,
   "end_elevation_m": 221.55867036585508,
   "start_xy": [
    319303.92312384315,
    292097.9654715052
   ],
   "end_xy": [
    319280.88379890815,
    292106.5708264263
   ]
  },
  "max_50m": {
   "gradient_pct": 21.922078365503353,
   "start_distance_m": 1292.0,
   "end_distance_m": 1342.0,
   "midpoint_distance_m": 1317.0,
   "start_elevation_m": 212.39992579240126,
   "end_elevation_m": 223.36096497515294,
   "start_xy": [
    319317.7570458163,
    292095.8154475889
   ],
   "end_xy": [
    319274.2457957783,
    292115.16197426035
   ]
  },
  "max_100m": {
   "gradient_pct": 17.463492169881846,
   "start_distance_m": 1243.0,
   "end_distance_m": 1343.0,
   "midpoint_distance_m": 1293.0,
   "start_elevation_m": 206.0282197071308,
   "end_elevation_m": 223.49171187701265,
   "start_xy": [
    319365.5545383223,
    292085.20082787954
   ],
   "end_xy": [
    319273.7225201291,
    292116.0141377394
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -24.429846898077585,
   "start_distance_m": 1854.0,
   "end_distance_m": 1859.0,
   "midpoint_distance_m": 1856.5,
   "start_elevation_m": 249.60704675276787,
   "end_elevation_m": 248.385554407864,
   "start_xy": [
    319013.2212619021,
    292440.76953519223
   ],
   "end_xy": [
    319008.2379308339,
    292440.3615995787
   ]
  },
  "min_10m": {
   "gradient_pct": -14.976668195123466,
   "start_distance_m": 1957.0,
   "end_distance_m": 1967.0,
   "midpoint_distance_m": 1962.0,
   "start_elevation_m": 263.5184375709965,
   "end_elevation_m": 262.0207707514842,
   "start_xy": [
    319060.4437798404,
    292514.2450720382
   ],
   "end_xy": [
    319067.35611880705,
    292521.4713829927
   ]
  },
  "min_20m": {
   "gradient_pct": -11.193370668142961,
   "start_distance_m": 1431.0,
   "end_distance_m": 1451.0,
   "midpoint_distance_m": 1441.0,
   "start_elevation_m": 222.9835876339161,
   "end_elevation_m": 220.7449135002875,
   "start_xy": [
    319278.9764779955,
    292199.60133139475
   ],
   "end_xy": [
    319275.9377691847,
    292219.2972213156
   ]
  },
  "min_25m": {
   "gradient_pct": -11.049854712137403,
   "start_distance_m": 1433.0,
   "end_distance_m": 1458.0,
   "midpoint_distance_m": 1445.5,
   "start_elevation_m": 222.70289436234134,
   "end_elevation_m": 219.940430684307,
   "start_xy": [
    319278.98902863037,
    292201.60129201476
   ],
   "end_xy": [
    319273.77492923324,
    292225.9154366598
   ]
  },
  "min_50m": {
   "gradient_pct": -10.064077992286457,
   "start_distance_m": 883.0,
   "end_distance_m": 933.0,
   "midpoint_distance_m": 908.0,
   "start_elevation_m": 210.28937788440172,
   "end_elevation_m": 205.2573388882585,
   "start_xy": [
    319553.4076805197,
    291873.35106916877
   ],
   "end_xy": [
    319506.489551451,
    291889.36825657735
   ]
  },
  "min_100m": {
   "gradient_pct": -8.652421590868641,
   "start_distance_m": 861.0,
   "end_distance_m": 961.0,
   "midpoint_distance_m": 911.0,
   "start_elevation_m": 211.97053689304474,
   "end_elevation_m": 203.3181153021761,
   "start_xy": [
    319575.2941535882,
    291871.11896329693
   ],
   "end_xy": [
    319480.6003930637,
    291899.8734403735
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.53068146521343,
   "start_distance_m": 1313.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1314.0,
   "start_elevation_m": 216.80853859849998,
   "end_elevation_m": 217.55915222780425,
   "start_xy": [
    319297.0139786288,
    292099.0718089461
   ],
   "end_xy": [
    319295.1250505973,
    292099.72903865617
   ]
  },
  "max_3m": {
   "gradient_pct": 35.0201903707557,
   "start_distance_m": 1312.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1313.5,
   "start_elevation_m": 216.50854651668158,
   "end_elevation_m": 217.55915222780425,
   "start_xy": [
    319297.99430014036,
    292098.8869103265
   ],
   "end_xy": [
    319295.1250505973,
    292099.72903865617
   ]
  }
 },
 "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": 0.474,
   "obstruction_max_height_m": 22.89,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.027,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    1584.0,
    1589.0
   ],
   [
    1881.0,
    1886.0
   ],
   [
    1890.0,
    1940.0
   ]
  ],
  "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_13_318291_20210316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_318292_20210316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_319291_20210316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_13_319292_20210316dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:08:38+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_13_318291_20210316dtm.tif",
   "wg_del_13_318292_20210316dtm.tif",
   "wg_del_13_319291_20210316dtm.tif",
   "wg_del_13_319292_20210316dtm.tif"
  ],
  "elevation_capture_dates": [
   "17-03-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.9% over 200 m (Terrain 50), gain 68.6 m over 1862 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 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 (52.5191, -3.1886)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.5191, -3.1886)'"
 },
 "area": {
  "place": "Cwmberllan Dingle",
  "county": "Powys - Powys"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.458,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 166.0,
  "shape_class": "stepped"
 }
}