{
 "ocl_version": "0.1.0",
 "name": "Llanrwst Road",
 "slug": "llanrwst-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.74560560624707,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 297.0,
   "end_distance_m": 299.0,
   "start_elevation_m": 26.53223961563552,
   "end_elevation_m": 27.28715172776046,
   "min_gradient_pct": -28.617828535468703,
   "suppressed_max_gradient_pct": 88.37039691929753,
   "suppressed_location_m": [
    335.0,
    337.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.8404722743204,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 297.0,
   "end_distance_m": 300.0,
   "start_elevation_m": 26.53223961563552,
   "end_elevation_m": 27.54745378386513,
   "min_gradient_pct": -12.946119585477808,
   "suppressed_max_gradient_pct": 77.96023355597488,
   "suppressed_location_m": [
    334.0,
    337.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.715811153722484,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 651.0,
   "end_distance_m": 656.0,
   "start_elevation_m": 59.345297710355055,
   "end_elevation_m": 60.68108826804118,
   "min_gradient_pct": -11.45913281199654,
   "suppressed_max_gradient_pct": 58.48941760971314,
   "suppressed_location_m": [
    332.0,
    337.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.145512704699513,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 646.0,
   "end_distance_m": 656.0,
   "start_elevation_m": 58.16653699757123,
   "end_elevation_m": 60.68108826804118,
   "min_gradient_pct": -5.796231034701691,
   "suppressed_max_gradient_pct": 40.32134604462314,
   "suppressed_location_m": [
    738.0,
    748.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.23353928935336,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1189.0,
   "end_distance_m": 1209.0,
   "start_elevation_m": 118.24559232181332,
   "end_elevation_m": 122.29230017968399,
   "min_gradient_pct": -1.2587347310407893,
   "suppressed_max_gradient_pct": 33.02652788946844,
   "suppressed_location_m": [
    733.0,
    753.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 19.629319210690937,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 1184.0,
   "end_distance_m": 1209.0,
   "start_elevation_m": 117.38497037701126,
   "end_elevation_m": 122.29230017968399,
   "min_gradient_pct": -1.1367729712034773,
   "suppressed_max_gradient_pct": 28.848759576477846,
   "suppressed_location_m": [
    728.0,
    753.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.77767196282224,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1160.0,
   "end_distance_m": 1210.0,
   "start_elevation_m": 114.52433702206875,
   "end_elevation_m": 122.41317300347987,
   "min_gradient_pct": -0.8429077597296484,
   "suppressed_max_gradient_pct": 21.956196520967698,
   "suppressed_location_m": [
    703.0,
    753.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.376137181222107,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1109.0,
   "end_distance_m": 1209.0,
   "start_elevation_m": 107.91616299846189,
   "end_elevation_m": 122.29230017968399,
   "min_gradient_pct": -0.6030264695711303,
   "suppressed_max_gradient_pct": 17.781348217656195,
   "suppressed_location_m": [
    653.0,
    753.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.334,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 122.0,
  "shape_class": "sustained"
 },
 "length_m": 1222.426305467115,
 "start_elevation_m": 12.545178098172851,
 "end_elevation_m": 123.92000687560984,
 "endpoint_gain_m": 111.37482877743699,
 "overall_gradient_pct": 9.110964667508387,
 "accumulated_ascent_m": 118.45514411722914,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.715811153722484,
   "start_distance_m": 651.0,
   "end_distance_m": 656.0,
   "midpoint_distance_m": 653.5,
   "start_elevation_m": 59.345297710355055,
   "end_elevation_m": 60.68108826804118,
   "start_xy": [
    283704.50546789385,
    379136.24376750895
   ],
   "end_xy": [
    283706.5723597763,
    379131.69097153464
   ]
  },
  "max_10m": {
   "gradient_pct": 25.145512704699513,
   "start_distance_m": 646.0,
   "end_distance_m": 656.0,
   "midpoint_distance_m": 651.0,
   "start_elevation_m": 58.16653699757123,
   "end_elevation_m": 60.68108826804118,
   "start_xy": [
    283702.43937944126,
    379140.7969281574
   ],
   "end_xy": [
    283706.5723597763,
    379131.69097153464
   ]
  },
  "max_20m": {
   "gradient_pct": 20.23353928935336,
   "start_distance_m": 1189.0,
   "end_distance_m": 1209.0,
   "midpoint_distance_m": 1199.0,
   "start_elevation_m": 118.24559232181332,
   "end_elevation_m": 122.29230017968399,
   "start_xy": [
    283869.1320631453,
    378650.913049597
   ],
   "end_xy": [
    283851.0828072795,
    378646.1077904315
   ]
  },
  "max_25m": {
   "gradient_pct": 19.629319210690937,
   "start_distance_m": 1184.0,
   "end_distance_m": 1209.0,
   "midpoint_distance_m": 1196.5,
   "start_elevation_m": 117.38497037701126,
   "end_elevation_m": 122.29230017968399,
   "start_xy": [
    283871.002238359,
    378655.5501208481
   ],
   "end_xy": [
    283851.0828072795,
    378646.1077904315
   ]
  },
  "max_50m": {
   "gradient_pct": 15.77767196282224,
   "start_distance_m": 1160.0,
   "end_distance_m": 1210.0,
   "midpoint_distance_m": 1185.0,
   "start_elevation_m": 114.52433702206875,
   "end_elevation_m": 122.41317300347987,
   "start_xy": [
    283884.9173212834,
    378670.0260006314
   ],
   "end_xy": [
    283850.75529114594,
    378645.1846569669
   ]
  },
  "max_100m": {
   "gradient_pct": 14.376137181222107,
   "start_distance_m": 1109.0,
   "end_distance_m": 1209.0,
   "midpoint_distance_m": 1159.0,
   "start_elevation_m": 107.91616299846189,
   "end_elevation_m": 122.29230017968399,
   "start_xy": [
    283881.8393197161,
    378720.93302672706
   ],
   "end_xy": [
    283851.0828072795,
    378646.1077904315
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -11.45913281199654,
   "start_distance_m": 835.0,
   "end_distance_m": 840.0,
   "midpoint_distance_m": 837.5,
   "start_elevation_m": 84.09987204746764,
   "end_elevation_m": 83.52691540686781,
   "start_xy": [
    283800.63199287327,
    378979.62197777914
   ],
   "end_xy": [
    283803.3328676674,
    378975.414214957
   ]
  },
  "min_10m": {
   "gradient_pct": -5.796231034701691,
   "start_distance_m": 629.0,
   "end_distance_m": 639.0,
   "midpoint_distance_m": 634.0,
   "start_elevation_m": 57.56054821902996,
   "end_elevation_m": 56.98092511555979,
   "start_xy": [
    283693.7691205891,
    379155.27386550483
   ],
   "end_xy": [
    283699.54631927045,
    379147.1711098161
   ]
  },
  "min_20m": {
   "gradient_pct": -1.2587347310407893,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 12.545178098172851,
   "end_elevation_m": 12.293431151964693,
   "start_xy": [
    283245.409,
    379388.129
   ],
   "end_xy": [
    283264.6447512826,
    379393.60492915945
   ]
  },
  "min_25m": {
   "gradient_pct": -1.1367729712034773,
   "start_distance_m": 1.0,
   "end_distance_m": 26.0,
   "midpoint_distance_m": 13.5,
   "start_elevation_m": 12.532333857716937,
   "end_elevation_m": 12.248140614916068,
   "start_xy": [
    283246.3707499775,
    379388.40292878775
   ],
   "end_xy": [
    283270.4153640076,
    379395.2481036779
   ]
  },
  "min_50m": {
   "gradient_pct": -0.8429077597296484,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 12.545178098172851,
   "end_elevation_m": 12.123724218308027,
   "start_xy": [
    283245.409,
    379388.129
   ],
   "end_xy": [
    283293.49976669834,
    379401.8139341038
   ]
  },
  "min_100m": {
   "gradient_pct": -0.6030264695711303,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 12.545178098172851,
   "end_elevation_m": 11.94215162860172,
   "start_xy": [
    283245.409,
    379388.129
   ],
   "end_xy": [
    283341.6018758203,
    379415.4589647598
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.74560560624707,
   "start_distance_m": 297.0,
   "end_distance_m": 299.0,
   "midpoint_distance_m": 298.0,
   "start_elevation_m": 26.53223961563552,
   "end_elevation_m": 27.28715172776046,
   "start_xy": [
    283527.45989989693,
    379432.06448459113
   ],
   "end_xy": [
    283529.2324611701,
    379431.1381873782
   ]
  },
  "max_3m": {
   "gradient_pct": 33.8404722743204,
   "start_distance_m": 297.0,
   "end_distance_m": 300.0,
   "midpoint_distance_m": 298.5,
   "start_elevation_m": 26.53223961563552,
   "end_elevation_m": 27.54745378386513,
   "start_xy": [
    283527.45989989693,
    379432.06448459113
   ],
   "end_xy": [
    283530.11833338736,
    379430.6742580605
   ]
  }
 },
 "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": 0.014,
   "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": 0.089,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.12,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 269.0,
     "end_m": 294.0,
     "raw_pct": 22.55,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 270.0,
     "end_m": 290.0,
     "raw_pct": 22.88,
     "reason": "hump"
    },
    {
     "window_m": 5.0,
     "start_m": 735.0,
     "end_m": 740.0,
     "raw_pct": 38.02,
     "reason": "mask-edge"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.633,
   "obstruction_max_height_m": 25.99,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    267.0,
    296.0
   ],
   [
    333.0,
    370.0
   ],
   [
    733.0,
    750.0
   ],
   [
    770.0,
    830.0
   ]
  ],
  "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_19_283378_20211221dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_19_283379_20211221dtm.tif"
  ],
  "calculated_at": "2026-09-15T21:26:30+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": "retro-260915-dogleg-all",
  "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_19_283378_20211221dtm.tif",
   "wg_del_19_283379_20211221dtm.tif"
  ],
  "elevation_capture_dates": [
   "22-12-2021"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bron-y-Nant",
  "county": "Conwy - Conwy"
 }
}