{
 "ocl_version": "0.1.0",
 "name": "Brynteg",
 "slug": "brynteg",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 31.918236527413058,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 94.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 187.77277040762905,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": -2.103535040753002
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.57714393228245,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 93.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 187.55382082020884,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": -1.3532370144019978
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.21145403425203,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 91.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 187.1005624364647,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": -0.742986886853032
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.50422656745303,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 86.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 185.960712481432,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": 1.2995616806699672
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.348790928917452,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 76.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 183.94137695239382,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": 6.347547495731334
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.432992243715034,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 182.80288707724856,
   "end_elevation_m": 188.41113513817731,
   "min_gradient_pct": 8.093355559093652
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.14426719795352,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 67.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 182.0774025669209,
   "end_elevation_m": 192.64953616589767,
   "min_gradient_pct": 11.681986027918299
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.82255901938194,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 173.70103705641642,
   "end_elevation_m": 190.52359607579837,
   "min_gradient_pct": 16.257061807784964
  }
 ],
 "shape": {
  "ascent_concentration": 0.32,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 68.0,
  "shape_class": "sustained"
 },
 "length_m": 119.09411384308116,
 "start_elevation_m": 172.4592830379476,
 "end_elevation_m": 192.81483315696624,
 "endpoint_gain_m": 20.35555011901863,
 "overall_gradient_pct": 17.09198671719341,
 "accumulated_ascent_m": 20.4839891546479,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.21145403425203,
   "start_distance_m": 91.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 93.5,
   "start_elevation_m": 187.1005624364647,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262560.2108071817,
    367013.25107568403
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  },
  "max_10m": {
   "gradient_pct": 24.50422656745303,
   "start_distance_m": 86.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 91.0,
   "start_elevation_m": 185.960712481432,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262555.2128161902,
    367013.1093504249
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  },
  "max_20m": {
   "gradient_pct": 22.348790928917452,
   "start_distance_m": 76.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 86.0,
   "start_elevation_m": 183.94137695239382,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262545.66387337545,
    367011.436435266
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  },
  "max_25m": {
   "gradient_pct": 22.432992243715034,
   "start_distance_m": 71.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 83.5,
   "start_elevation_m": 182.80288707724856,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262541.52089806716,
    367008.63719329814
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  },
  "max_50m": {
   "gradient_pct": 21.14426719795352,
   "start_distance_m": 67.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 92.0,
   "start_elevation_m": 182.0774025669209,
   "end_elevation_m": 192.64953616589767,
   "start_xy": [
    262538.2065178205,
    367006.39779972384
   ],
   "end_xy": [
    262583.97657143284,
    367023.0816316389
   ]
  },
  "max_100m": {
   "gradient_pct": 16.82255901938194,
   "start_distance_m": 7.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 57.0,
   "start_elevation_m": 173.70103705641642,
   "end_elevation_m": 190.52359607579837,
   "start_xy": [
    262517.97514565417,
    366952.25061842985
   ],
   "end_xy": [
    262574.97787934454,
    367018.72003322764
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.742986886853032,
   "start_distance_m": 45.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 47.5,
   "start_elevation_m": 179.96584290845772,
   "end_elevation_m": 179.92869356411506,
   "start_xy": [
    262526.340852175,
    366989.12181942834
   ],
   "end_xy": [
    262528.04334276833,
    366993.8230454152
   ]
  },
  "min_10m": {
   "gradient_pct": 1.2995616806699672,
   "start_distance_m": 43.0,
   "end_distance_m": 53.0,
   "midpoint_distance_m": 48.0,
   "start_elevation_m": 179.90189672141332,
   "end_elevation_m": 180.03185288948032,
   "start_xy": [
    262525.6598559377,
    366987.24132903357
   ],
   "end_xy": [
    262529.0648371243,
    366996.6437810073
   ]
  },
  "min_20m": {
   "gradient_pct": 6.347547495731334,
   "start_distance_m": 39.0,
   "end_distance_m": 59.0,
   "midpoint_distance_m": 49.0,
   "start_elevation_m": 179.4692487012167,
   "end_elevation_m": 180.73875820036298,
   "start_xy": [
    262524.29786346306,
    366983.4803482441
   ],
   "end_xy": [
    262531.5777573272,
    367001.9190125753
   ]
  },
  "min_25m": {
   "gradient_pct": 8.093355559093652,
   "start_distance_m": 37.0,
   "end_distance_m": 62.0,
   "midpoint_distance_m": 49.5,
   "start_elevation_m": 179.19591648239697,
   "end_elevation_m": 181.21925537217038,
   "start_xy": [
    262523.6168672257,
    366981.59985784936
   ],
   "end_xy": [
    262534.0635425121,
    367003.598557756
   ]
  },
  "min_50m": {
   "gradient_pct": 11.681986027918299,
   "start_distance_m": 20.0,
   "end_distance_m": 70.0,
   "midpoint_distance_m": 45.0,
   "start_elevation_m": 176.74691806720847,
   "end_elevation_m": 182.58791108116762,
   "start_xy": [
    262519.8139875834,
    366965.1199097996
   ],
   "end_xy": [
    262540.6923030055,
    367008.0773449046
   ]
  },
  "min_100m": {
   "gradient_pct": 16.257061807784964,
   "start_distance_m": 19.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 69.0,
   "start_elevation_m": 176.5516838885218,
   "end_elevation_m": 192.80874569630677,
   "start_xy": [
    262519.67253820424,
    366964.1299643096
   ],
   "end_xy": [
    262585.77630985045,
    367023.95395132113
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 31.918236527413058,
   "start_distance_m": 94.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 95.0,
   "start_elevation_m": 187.77277040762905,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262563.20960177656,
    367013.33611083956
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  },
  "max_3m": {
   "gradient_pct": 28.57714393228245,
   "start_distance_m": 93.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 94.5,
   "start_elevation_m": 187.55382082020884,
   "end_elevation_m": 188.41113513817731,
   "start_xy": [
    262562.2100035783,
    367013.3077657877
   ],
   "end_xy": [
    262565.0793180475,
    367013.9222749753
   ]
  }
 },
 "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": 0.041,
   "obstruction_max_height_m": 2.67,
   "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_11_262366_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_262367_20210302dtm.tif"
  ],
  "calculated_at": "2026-08-27T06:14:37+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_11_262366_20210302dtm.tif",
   "wg_del_11_262367_20210302dtm.tif"
  ],
  "elevation_capture_dates": [
   "02-03-2021"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Bethesda",
  "county": "Gwynedd - Gwynedd"
 }
}