{
 "ocl_version": "0.1.0",
 "name": "Pen-y-Ffridd",
 "slug": "pen-y-ffridd",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.834179476769293,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 696.0,
   "end_distance_m": 698.0,
   "start_elevation_m": 194.71067705430627,
   "end_elevation_m": 195.24736064384166,
   "min_gradient_pct": -2.2724819548358255
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.287060099231855,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 695.0,
   "end_distance_m": 698.0,
   "start_elevation_m": 194.5487488408647,
   "end_elevation_m": 195.24736064384166,
   "min_gradient_pct": 1.9065675787942382
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.45356989669267,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 693.0,
   "end_distance_m": 698.0,
   "start_elevation_m": 194.17468214900703,
   "end_elevation_m": 195.24736064384166,
   "min_gradient_pct": 2.304467297838073
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 18.731992294263762,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 692.0,
   "end_distance_m": 702.0,
   "start_elevation_m": 194.02646662254057,
   "end_elevation_m": 195.89966585196694,
   "min_gradient_pct": 2.7210408221731086
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 17.32003932097001,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 682.0,
   "end_distance_m": 702.0,
   "start_elevation_m": 192.43565798777294,
   "end_elevation_m": 195.89966585196694,
   "min_gradient_pct": 3.3136561005481724
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 17.00018522530752,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 677.0,
   "end_distance_m": 702.0,
   "start_elevation_m": 191.64961954564006,
   "end_elevation_m": 195.89966585196694,
   "min_gradient_pct": 3.5701358056503523
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.085166419639734,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 652.0,
   "end_distance_m": 702.0,
   "start_elevation_m": 187.85708264214708,
   "end_elevation_m": 195.89966585196694,
   "min_gradient_pct": 4.204518123093237
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.534833336425068,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 511.0,
   "end_distance_m": 611.0,
   "start_elevation_m": 168.61673319565668,
   "end_elevation_m": 183.15156653208174,
   "min_gradient_pct": 5.041450264010706
  }
 ],
 "length_m": 1508.8343810039112,
 "start_elevation_m": 127.41564196185348,
 "end_elevation_m": 281.57095018872025,
 "endpoint_gain_m": 154.15530822686677,
 "overall_gradient_pct": 10.216847532616448,
 "accumulated_ascent_m": 154.318176280824,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.45356989669267,
   "start_distance_m": 693.0,
   "end_distance_m": 698.0,
   "midpoint_distance_m": 695.5,
   "start_elevation_m": 194.17468214900703,
   "end_elevation_m": 195.24736064384166,
   "start_xy": [
    257998.26365907292,
    365744.82361955545
   ],
   "end_xy": [
    258000.15906180473,
    365740.1968011579
   ]
  },
  "max_10m": {
   "gradient_pct": 18.731992294263762,
   "start_distance_m": 692.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 697.0,
   "start_elevation_m": 194.02646662254057,
   "end_elevation_m": 195.89966585196694,
   "start_xy": [
    257997.88457852657,
    365745.748983235
   ],
   "end_xy": [
    258001.6753839902,
    365736.4953464398
   ]
  },
  "max_20m": {
   "gradient_pct": 17.32003932097001,
   "start_distance_m": 682.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 692.0,
   "start_elevation_m": 192.43565798777294,
   "end_elevation_m": 195.89966585196694,
   "start_xy": [
    257993.27078032936,
    365754.53040128795
   ],
   "end_xy": [
    258001.6753839902,
    365736.4953464398
   ]
  },
  "max_25m": {
   "gradient_pct": 17.00018522530752,
   "start_distance_m": 677.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 689.5,
   "start_elevation_m": 191.64961954564006,
   "end_elevation_m": 195.89966585196694,
   "start_xy": [
    257990.23278171616,
    365758.50161828357
   ],
   "end_xy": [
    258001.6753839902,
    365736.4953464398
   ]
  },
  "max_50m": {
   "gradient_pct": 16.085166419639734,
   "start_distance_m": 652.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 677.0,
   "start_elevation_m": 187.85708264214708,
   "end_elevation_m": 195.89966585196694,
   "start_xy": [
    257975.04278865008,
    365778.35770326154
   ],
   "end_xy": [
    258001.6753839902,
    365736.4953464398
   ]
  },
  "max_100m": {
   "gradient_pct": 14.534833336425068,
   "start_distance_m": 511.0,
   "end_distance_m": 611.0,
   "midpoint_distance_m": 561.0,
   "start_elevation_m": 168.61673319565668,
   "end_elevation_m": 183.15156653208174,
   "start_xy": [
    257892.2272273341,
    365884.3221444227
   ],
   "end_xy": [
    257944.6535481695,
    365804.7422726119
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.304467297838073,
   "start_distance_m": 9.0,
   "end_distance_m": 14.0,
   "midpoint_distance_m": 11.5,
   "start_elevation_m": 127.71901558841307,
   "end_elevation_m": 127.83423895330498,
   "start_xy": [
    257536.45139493595,
    366206.1668576648
   ],
   "end_xy": [
    257539.93439212258,
    366202.5795563675
   ]
  },
  "min_10m": {
   "gradient_pct": 2.7210408221731086,
   "start_distance_m": 400.0,
   "end_distance_m": 410.0,
   "midpoint_distance_m": 405.0,
   "start_elevation_m": 160.22577702682216,
   "end_elevation_m": 160.49788110903947,
   "start_xy": [
    257807.41697925958,
    365933.49730536185
   ],
   "end_xy": [
    257811.49988686302,
    365924.36878601304
   ]
  },
  "min_20m": {
   "gradient_pct": 3.3136561005481724,
   "start_distance_m": 400.0,
   "end_distance_m": 420.0,
   "midpoint_distance_m": 410.0,
   "start_elevation_m": 160.22577702682216,
   "end_elevation_m": 160.8885082469318,
   "start_xy": [
    257807.41697925958,
    365933.49730536185
   ],
   "end_xy": [
    257815.58279446643,
    365915.2402666642
   ]
  },
  "min_25m": {
   "gradient_pct": 3.5701358056503523,
   "start_distance_m": 393.0,
   "end_distance_m": 418.0,
   "midpoint_distance_m": 405.5,
   "start_elevation_m": 159.91112795338998,
   "end_elevation_m": 160.80366190480257,
   "start_xy": [
    257804.55894393718,
    365939.88726890605
   ],
   "end_xy": [
    257814.76621294575,
    365917.065970534
   ]
  },
  "min_50m": {
   "gradient_pct": 4.204518123093237,
   "start_distance_m": 384.0,
   "end_distance_m": 434.0,
   "midpoint_distance_m": 409.0,
   "start_elevation_m": 159.41909405568202,
   "end_elevation_m": 161.52135311722864,
   "start_xy": [
    257800.35827115443,
    365947.84206182894
   ],
   "end_xy": [
    257823.35597296833,
    365903.7449054581
   ]
  },
  "min_100m": {
   "gradient_pct": 5.041450264010706,
   "start_distance_m": 348.0,
   "end_distance_m": 448.0,
   "midpoint_distance_m": 398.0,
   "start_elevation_m": 157.3061403313558,
   "end_elevation_m": 162.3475905953665,
   "start_xy": [
    257782.1221966925,
    365978.67534967285
   ],
   "end_xy": [
    257833.97273255745,
    365894.8344474166
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.834179476769293,
   "start_distance_m": 696.0,
   "end_distance_m": 698.0,
   "midpoint_distance_m": 697.0,
   "start_elevation_m": 194.71067705430627,
   "end_elevation_m": 195.24736064384166,
   "start_xy": [
    257999.400900712,
    365742.0475285169
   ],
   "end_xy": [
    258000.15906180473,
    365740.1968011579
   ]
  },
  "max_3m": {
   "gradient_pct": 23.287060099231855,
   "start_distance_m": 695.0,
   "end_distance_m": 698.0,
   "midpoint_distance_m": 696.5,
   "start_elevation_m": 194.5487488408647,
   "end_elevation_m": 195.24736064384166,
   "start_xy": [
    257999.02182016565,
    365742.97289219644
   ],
   "end_xy": [
    258000.15906180473,
    365740.1968011579
   ]
  }
 },
 "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": 0.035,
   "obstruction_max_height_m": 9.86,
   "flagged_windows_m": [
    5
   ]
  },
  "review": [],
  "extent": [
   "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_257365_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_257366_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_258365_20210302dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_11_258366_20210302dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:11:07+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_11_257365_20210302dtm.tif",
   "wg_del_11_257366_20210302dtm.tif",
   "wg_del_11_258365_20210302dtm.tif",
   "wg_del_11_258366_20210302dtm.tif"
  ],
  "elevation_capture_dates": [
   "02-03-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.5% over 200 m (Terrain 50), gain 80.2 m over 754 m way. EXTENDED by graph walk: +13 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): discovered-lane-53-1715-4-1288 ADOPTED (notable slice 2026-08-11): endurance."
 },
 "area": {
  "place": "Rhiwlas",
  "county": "Gwynedd - Gwynedd"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.31,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 }
}