{
 "ocl_version": "0.1.0",
 "name": "Cefngorwydd to Tirabad",
 "slug": "discovered-street-52-0829-3-5964",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.491192441986584,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1189.0,
   "end_distance_m": 1191.0,
   "start_elevation_m": 246.76660015644939,
   "end_elevation_m": 247.69642400528912,
   "min_gradient_pct": -81.68162756425374,
   "suppressed_max_gradient_pct": 85.16558494021353,
   "suppressed_location_m": [
    2601.0,
    2603.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.6468553048068,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1188.0,
   "end_distance_m": 1191.0,
   "start_elevation_m": 246.3870183461449,
   "end_elevation_m": 247.69642400528912,
   "min_gradient_pct": -81.74144948169821,
   "suppressed_max_gradient_pct": 78.29358496590164,
   "suppressed_location_m": [
    2600.0,
    2603.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.884516585794017,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1187.0,
   "end_distance_m": 1192.0,
   "start_elevation_m": 246.21220334609217,
   "end_elevation_m": 247.75642917538187,
   "min_gradient_pct": -72.33235978664766,
   "suppressed_max_gradient_pct": 67.4519914423604,
   "suppressed_location_m": [
    2600.0,
    2605.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.08224705781629,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1327.0,
   "end_distance_m": 1337.0,
   "start_elevation_m": 260.27759870555707,
   "end_elevation_m": 262.7858234113387,
   "min_gradient_pct": -50.3905437253286,
   "suppressed_max_gradient_pct": 49.56836926522158,
   "suppressed_location_m": [
    2600.0,
    2610.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.23011045559656,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2656.0,
   "end_distance_m": 2676.0,
   "start_elevation_m": 267.9583683606073,
   "end_elevation_m": 272.00439045172664,
   "min_gradient_pct": -28.202878875843993,
   "suppressed_max_gradient_pct": 33.83570295349898,
   "suppressed_location_m": [
    2599.0,
    2619.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.057284125103024,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2660.0,
   "end_distance_m": 2685.0,
   "start_elevation_m": 268.700532750976,
   "end_elevation_m": 273.71485378225174,
   "min_gradient_pct": -25.92833216636393,
   "suppressed_max_gradient_pct": 27.9806318755775,
   "suppressed_location_m": [
    2593.0,
    2618.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.71995703462835,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2653.0,
   "end_distance_m": 2703.0,
   "start_elevation_m": 267.39478196964836,
   "end_elevation_m": 277.25476048696254,
   "min_gradient_pct": -21.355182148626735,
   "suppressed_max_gradient_pct": 22.479606451288646,
   "suppressed_location_m": [
    2568.0,
    2618.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.83363101123416,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 2639.0,
   "end_distance_m": 2739.0,
   "start_elevation_m": 264.90890723124414,
   "end_elevation_m": 281.7425382424783,
   "min_gradient_pct": -18.263365081955243,
   "suppressed_max_gradient_pct": 18.70926594003018,
   "suppressed_location_m": [
    2518.0,
    2618.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.408,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 198.0,
  "shape_class": "sustained"
 },
 "length_m": 5390.966486164447,
 "start_elevation_m": 197.1045596669922,
 "end_elevation_m": 289.5830366210915,
 "endpoint_gain_m": 92.47847695409928,
 "overall_gradient_pct": 1.715434091297712,
 "accumulated_ascent_m": 234.4795475061562,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.884516585794017,
   "start_distance_m": 1187.0,
   "end_distance_m": 1192.0,
   "midpoint_distance_m": 1189.5,
   "start_elevation_m": 246.21220334609217,
   "end_elevation_m": 247.75642917538187,
   "start_xy": [
    290900.81501521636,
    244221.48145761542
   ],
   "end_xy": [
    290900.1365413752,
    244216.52770416506
   ]
  },
  "max_10m": {
   "gradient_pct": 25.08224705781629,
   "start_distance_m": 1327.0,
   "end_distance_m": 1337.0,
   "midpoint_distance_m": 1332.0,
   "start_elevation_m": 260.27759870555707,
   "end_elevation_m": 262.7858234113387,
   "start_xy": [
    290815.57039228006,
    244122.37783848503
   ],
   "end_xy": [
    290809.9261894839,
    244114.12296266554
   ]
  },
  "max_20m": {
   "gradient_pct": 20.23011045559656,
   "start_distance_m": 2656.0,
   "end_distance_m": 2676.0,
   "midpoint_distance_m": 2666.0,
   "start_elevation_m": 267.9583683606073,
   "end_elevation_m": 272.00439045172664,
   "start_xy": [
    290454.1391697017,
    243016.6703830164
   ],
   "end_xy": [
    290470.2977045596,
    243004.8847243056
   ]
  },
  "max_25m": {
   "gradient_pct": 20.057284125103024,
   "start_distance_m": 2660.0,
   "end_distance_m": 2685.0,
   "midpoint_distance_m": 2672.5,
   "start_elevation_m": 268.700532750976,
   "end_elevation_m": 273.71485378225174,
   "start_xy": [
    290457.3708766733,
    243014.31325127426
   ],
   "end_xy": [
    290477.5690452456,
    242999.58117788573
   ]
  },
  "max_50m": {
   "gradient_pct": 19.71995703462835,
   "start_distance_m": 2653.0,
   "end_distance_m": 2703.0,
   "midpoint_distance_m": 2678.0,
   "start_elevation_m": 267.39478196964836,
   "end_elevation_m": 277.25476048696254,
   "start_xy": [
    290451.7153894731,
    243018.43823182303
   ],
   "end_xy": [
    290488.84396875516,
    242986.0488782558
   ]
  },
  "max_100m": {
   "gradient_pct": 16.83363101123416,
   "start_distance_m": 2639.0,
   "end_distance_m": 2739.0,
   "midpoint_distance_m": 2689.0,
   "start_elevation_m": 264.90890723124414,
   "end_elevation_m": 281.7425382424783,
   "start_xy": [
    290440.4044150726,
    243026.68819292058
   ],
   "end_xy": [
    290456.49440555397,
    242981.332057866
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -72.33235978664766,
   "start_distance_m": 2627.0,
   "end_distance_m": 2632.0,
   "midpoint_distance_m": 2629.5,
   "start_elevation_m": 268.37403099167204,
   "end_elevation_m": 264.75741300233966,
   "start_xy": [
    290432.61927989626,
    243018.63379573688
   ],
   "end_xy": [
    290435.7996824824,
    243022.4919091865
   ]
  },
  "min_10m": {
   "gradient_pct": -50.3905437253286,
   "start_distance_m": 2622.0,
   "end_distance_m": 2632.0,
   "midpoint_distance_m": 2627.0,
   "start_elevation_m": 269.7964673748725,
   "end_elevation_m": 264.75741300233966,
   "start_xy": [
    290429.1935235834,
    243015.4777925954
   ],
   "end_xy": [
    290435.7996824824,
    243022.4919091865
   ]
  },
  "min_20m": {
   "gradient_pct": -28.202878875843993,
   "start_distance_m": 2418.0,
   "end_distance_m": 2438.0,
   "midpoint_distance_m": 2428.0,
   "start_elevation_m": 248.84644317891724,
   "end_elevation_m": 243.20586740374844,
   "start_xy": [
    290409.3871016218,
    243196.03940675658
   ],
   "end_xy": [
    290411.5008799949,
    243176.15142191676
   ]
  },
  "min_25m": {
   "gradient_pct": -25.92833216636393,
   "start_distance_m": 2413.0,
   "end_distance_m": 2438.0,
   "midpoint_distance_m": 2425.5,
   "start_elevation_m": 249.68795044533942,
   "end_elevation_m": 243.20586740374844,
   "start_xy": [
    290408.8586570285,
    243201.01140296654
   ],
   "end_xy": [
    290411.5008799949,
    243176.15142191676
   ]
  },
  "min_50m": {
   "gradient_pct": -21.355182148626735,
   "start_distance_m": 2388.0,
   "end_distance_m": 2438.0,
   "midpoint_distance_m": 2413.0,
   "start_elevation_m": 253.8834584780618,
   "end_elevation_m": 243.20586740374844,
   "start_xy": [
    290399.77306650876,
    243224.1466083176
   ],
   "end_xy": [
    290411.5008799949,
    243176.15142191676
   ]
  },
  "min_100m": {
   "gradient_pct": -18.263365081955243,
   "start_distance_m": 2338.0,
   "end_distance_m": 2438.0,
   "midpoint_distance_m": 2388.0,
   "start_elevation_m": 261.4692324857037,
   "end_elevation_m": 243.20586740374844,
   "start_xy": [
    290371.5793564432,
    243264.50628851194
   ],
   "end_xy": [
    290411.5008799949,
    243176.15142191676
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.491192441986584,
   "start_distance_m": 1189.0,
   "end_distance_m": 1191.0,
   "midpoint_distance_m": 1190.0,
   "start_elevation_m": 246.76660015644939,
   "end_elevation_m": 247.69642400528912,
   "start_xy": [
    290900.5436256799,
    244219.49995623526
   ],
   "end_xy": [
    290900.2722361434,
    244217.51845485513
   ]
  },
  "max_3m": {
   "gradient_pct": 43.6468553048068,
   "start_distance_m": 1188.0,
   "end_distance_m": 1191.0,
   "midpoint_distance_m": 1189.5,
   "start_elevation_m": 246.3870183461449,
   "end_elevation_m": 247.69642400528912,
   "start_xy": [
    290900.67932044814,
    244220.49070692534
   ],
   "end_xy": [
    290900.2722361434,
    244217.51845485513
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.008,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.014,
   "windows_resited": [
    20.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.286,
   "obstruction_max_height_m": 26.05,
   "flagged_windows_m": [
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    1181.0,
    1186.0
   ],
   [
    1340.0,
    1370.0
   ],
   [
    2598.0,
    2635.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 4559.0,
  "trailing_descent_m": 21.5
 },
 "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_28_288241_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_288242_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_288243_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_288244_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_289241_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_289242_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_289243_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_289244_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_290241_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_290242_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_290243_20220316dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_28_290244_20220316dtm.tif"
  ],
  "calculated_at": "2026-08-27T06:15:59+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",
  "run_id": "chains-wales-pilot-260827",
  "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_28_288241_20220316dtm.tif",
   "wg_del_28_288242_20220316dtm.tif",
   "wg_del_28_288243_20220316dtm.tif",
   "wg_del_28_288244_20220316dtm.tif",
   "wg_del_28_289241_20220316dtm.tif",
   "wg_del_28_289242_20220316dtm.tif",
   "wg_del_28_289243_20220316dtm.tif",
   "wg_del_28_289244_20220316dtm.tif",
   "wg_del_28_290241_20220316dtm.tif",
   "wg_del_28_290242_20220316dtm.tif",
   "wg_del_28_290243_20220316dtm.tif",
   "wg_del_28_290244_20220316dtm.tif"
  ],
  "elevation_capture_dates": [
   "17-03-2022"
  ],
  "climb_origin": "discovered",
  "naming_note": "auto-named from gazetteer; was discovered-street-52-0829-3-5964",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Cefn-gorwydd",
  "county": "Powys - Powys"
 }
}