{
 "ocl_version": "0.1.0",
 "name": "Bryncethin Road",
 "slug": "bryncethin-road",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.89282510010872,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1485.0,
   "end_distance_m": 1487.0,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 248.10257246715074,
   "min_gradient_pct": -21.900925361674695,
   "suppressed_max_gradient_pct": 49.48584186330578,
   "suppressed_location_m": [
    1421.0,
    1423.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.19153780338828,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1485.0,
   "end_distance_m": 1488.0,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 248.5204620992502,
   "min_gradient_pct": -17.459469888790597,
   "suppressed_max_gradient_pct": 44.09680193830923,
   "suppressed_location_m": [
    1421.0,
    1424.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.96336713889855,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1484.0,
   "end_distance_m": 1489.0,
   "start_elevation_m": 247.07533439910435,
   "end_elevation_m": 248.87350275604928,
   "min_gradient_pct": -9.101504058028809,
   "suppressed_max_gradient_pct": 43.733367577215176,
   "suppressed_location_m": [
    1421.0,
    1426.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.682661086392727,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1494.0,
   "end_distance_m": 1504.0,
   "start_elevation_m": 249.5760159078941,
   "end_elevation_m": 252.74428201653336,
   "min_gradient_pct": -4.023892678440575,
   "suppressed_max_gradient_pct": 36.435988544309055,
   "suppressed_location_m": [
    1416.0,
    1426.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 29.27536122866485,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1485.0,
   "end_distance_m": 1505.0,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 253.07978821088153,
   "min_gradient_pct": 0.8169322978318405
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 28.150356897440815,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1480.0,
   "end_distance_m": 1505.0,
   "start_elevation_m": 246.04219898652133,
   "end_elevation_m": 253.07978821088153,
   "min_gradient_pct": 0.9330601746207776
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 26.510840294964108,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1466.0,
   "end_distance_m": 1516.0,
   "start_elevation_m": 242.3740768903269,
   "end_elevation_m": 255.62949703780896,
   "min_gradient_pct": 1.590193575345495
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.728121608825347,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1422.0,
   "end_distance_m": 1522.0,
   "start_elevation_m": 236.74300024090155,
   "end_elevation_m": 256.4711218497269,
   "min_gradient_pct": 2.4775689405049945,
   "suppressed_max_gradient_pct": 20.86901532846292,
   "suppressed_location_m": [
    1418.0,
    1518.0
   ]
  }
 ],
 "length_m": 1634.7946988015888,
 "start_elevation_m": 116.68595457722499,
 "end_elevation_m": 262.7561696689428,
 "endpoint_gain_m": 146.07021509171778,
 "overall_gradient_pct": 8.93508005615609,
 "accumulated_ascent_m": 150.01708954181436,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.96336713889855,
   "start_distance_m": 1484.0,
   "end_distance_m": 1489.0,
   "midpoint_distance_m": 1486.5,
   "start_elevation_m": 247.07533439910435,
   "end_elevation_m": 248.87350275604928,
   "start_xy": [
    269161.5259930271,
    211717.81031613506
   ],
   "end_xy": [
    269160.79839192744,
    211712.86385844066
   ]
  },
  "max_10m": {
   "gradient_pct": 31.682661086392727,
   "start_distance_m": 1494.0,
   "end_distance_m": 1504.0,
   "midpoint_distance_m": 1499.0,
   "start_elevation_m": 249.5760159078941,
   "end_elevation_m": 252.74428201653336,
   "start_xy": [
    269160.0788324983,
    211707.9159059118
   ],
   "end_xy": [
    269158.6397136399,
    211698.02000085407
   ]
  },
  "max_20m": {
   "gradient_pct": 29.27536122866485,
   "start_distance_m": 1485.0,
   "end_distance_m": 1505.0,
   "midpoint_distance_m": 1495.0,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 253.07978821088153,
   "start_xy": [
    269161.37403947074,
    211716.82222046374
   ],
   "end_xy": [
    269158.4958017541,
    211697.0304103483
   ]
  },
  "max_25m": {
   "gradient_pct": 28.150356897440815,
   "start_distance_m": 1480.0,
   "end_distance_m": 1505.0,
   "midpoint_distance_m": 1492.5,
   "start_elevation_m": 246.04219898652133,
   "end_elevation_m": 253.07978821088153,
   "start_xy": [
    269162.4112558117,
    211721.71112500018
   ],
   "end_xy": [
    269158.4958017541,
    211697.0304103483
   ]
  },
  "max_50m": {
   "gradient_pct": 26.510840294964108,
   "start_distance_m": 1466.0,
   "end_distance_m": 1516.0,
   "midpoint_distance_m": 1491.0,
   "start_elevation_m": 242.3740768903269,
   "end_elevation_m": 255.62949703780896,
   "start_xy": [
    269165.5096755578,
    211735.3639560281
   ],
   "end_xy": [
    269156.91277100996,
    211686.1449147848
   ]
  },
  "max_100m": {
   "gradient_pct": 19.728121608825347,
   "start_distance_m": 1422.0,
   "end_distance_m": 1522.0,
   "midpoint_distance_m": 1472.0,
   "start_elevation_m": 236.74300024090155,
   "end_elevation_m": 256.4711218497269,
   "start_xy": [
    269178.0544017677,
    211776.8950820729
   ],
   "end_xy": [
    269156.04929969495,
    211680.20737175015
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.101504058028809,
   "start_distance_m": 1435.0,
   "end_distance_m": 1440.0,
   "midpoint_distance_m": 1437.5,
   "start_elevation_m": 239.51972187035776,
   "end_elevation_m": 239.06464666745632,
   "start_xy": [
    269172.3704621385,
    211765.5952247328
   ],
   "end_xy": [
    269171.2638836577,
    211760.71921365138
   ]
  },
  "min_10m": {
   "gradient_pct": -4.023892678440575,
   "start_distance_m": 1523.0,
   "end_distance_m": 1533.0,
   "midpoint_distance_m": 1528.0,
   "start_elevation_m": 256.54071766111434,
   "end_elevation_m": 256.1383283932703,
   "start_xy": [
    269155.9053878091,
    211679.21778124437
   ],
   "end_xy": [
    269154.4662689508,
    211669.32187618664
   ]
  },
  "min_20m": {
   "gradient_pct": 0.8169322978318405,
   "start_distance_m": 1102.0,
   "end_distance_m": 1122.0,
   "midpoint_distance_m": 1112.0,
   "start_elevation_m": 204.0206771712862,
   "end_elevation_m": 204.18406363085256,
   "start_xy": [
    269281.54212342727,
    212038.93576426656
   ],
   "end_xy": [
    269293.4134954987,
    212022.84009636674
   ]
  },
  "min_25m": {
   "gradient_pct": 0.9330601746207776,
   "start_distance_m": 1098.0,
   "end_distance_m": 1123.0,
   "midpoint_distance_m": 1110.5,
   "start_elevation_m": 203.96609524435138,
   "end_elevation_m": 204.19936028800657,
   "start_xy": [
    269279.167849013,
    212042.1548978465
   ],
   "end_xy": [
    269294.0070641023,
    212022.03531297174
   ]
  },
  "min_50m": {
   "gradient_pct": 1.590193575345495,
   "start_distance_m": 1087.0,
   "end_distance_m": 1137.0,
   "midpoint_distance_m": 1112.0,
   "start_elevation_m": 203.681959034267,
   "end_elevation_m": 204.47705582193976,
   "start_xy": [
    269272.63859437365,
    212051.00751519142
   ],
   "end_xy": [
    269302.3170245523,
    212010.76834544187
   ]
  },
  "min_100m": {
   "gradient_pct": 2.4775689405049945,
   "start_distance_m": 602.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 652.0,
   "start_elevation_m": 169.31167156408935,
   "end_elevation_m": 171.78924050459435,
   "start_xy": [
    269304.96704509686,
    212523.43134490272
   ],
   "end_xy": [
    269295.9867062434,
    212423.83753590946
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.89282510010872,
   "start_distance_m": 1485.0,
   "end_distance_m": 1487.0,
   "midpoint_distance_m": 1486.0,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 248.10257246715074,
   "start_xy": [
    269161.37403947074,
    211716.82222046374
   ],
   "end_xy": [
    269161.0862156991,
    211714.84303945221
   ]
  },
  "max_3m": {
   "gradient_pct": 43.19153780338828,
   "start_distance_m": 1485.0,
   "end_distance_m": 1488.0,
   "midpoint_distance_m": 1486.5,
   "start_elevation_m": 247.22471596514856,
   "end_elevation_m": 248.5204620992502,
   "start_xy": [
    269161.37403947074,
    211716.82222046374
   ],
   "end_xy": [
    269160.94230381324,
    211713.85344894644
   ]
  }
 },
 "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": 0.312,
   "obstruction_max_height_m": 16.36,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.02,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    1390.0,
    1421.0
   ]
  ],
  "review": [],
  "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_21_269211_20220113dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_21_269212_20220113dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_21_269213_20220113dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:06:14+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_21_269211_20220113dtm.tif",
   "wg_del_21_269212_20220113dtm.tif",
   "wg_del_21_269213_20220113dtm.tif"
  ],
  "elevation_capture_dates": [
   "13-01-2022"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.0% over 200 m (Terrain 50), gain 139.0 m over 1550 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. ADOPTED (notable slice 2026-08-11): qualified-steep."
 },
 "area": {
  "place": "Cwm Garnant",
  "county": "Castell-nedd Port Talbot - Neath Port Talbot"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.388,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 142.0,
  "shape_class": "sustained"
 }
}