{
 "ocl_version": "0.1.0",
 "name": "Penrhiw Lane",
 "slug": "penrhiw-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.58485443415512,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 346.0,
   "end_distance_m": 348.0,
   "start_elevation_m": 84.41405296952071,
   "end_elevation_m": 85.30575005820381,
   "min_gradient_pct": -45.52499831320205
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.958293006883935,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 346.0,
   "end_distance_m": 349.0,
   "start_elevation_m": 84.41405296952071,
   "end_elevation_m": 85.49280175972723,
   "min_gradient_pct": -29.617297978911,
   "suppressed_max_gradient_pct": 38.4407215821137,
   "suppressed_location_m": [
    342.0,
    345.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.764202879444497,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 622.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 134.88626665910238,
   "end_elevation_m": 136.3744768030746,
   "min_gradient_pct": -2.4390330372025915,
   "suppressed_max_gradient_pct": 37.3568910936271,
   "suppressed_location_m": [
    343.0,
    348.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.39689455996671,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 618.0,
   "end_distance_m": 628.0,
   "start_elevation_m": 133.998408721712,
   "end_elevation_m": 136.43809817770867,
   "min_gradient_pct": -0.8434302867222954,
   "suppressed_max_gradient_pct": 25.835186178989886,
   "suppressed_location_m": [
    342.0,
    352.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.607202291518576,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 607.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 131.85303634477089,
   "end_elevation_m": 136.3744768030746,
   "min_gradient_pct": 0.3617898684588283
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.859113310749308,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 505.0,
   "end_distance_m": 530.0,
   "start_elevation_m": 110.80686090492259,
   "end_elevation_m": 116.27163923260991,
   "min_gradient_pct": 0.6694046413077785
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.420648512616225,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 505.0,
   "end_distance_m": 555.0,
   "start_elevation_m": 110.80686090492259,
   "end_elevation_m": 121.5171851612307,
   "min_gradient_pct": 3.116270755849328
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.786178026894223,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 527.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 115.58829877618038,
   "end_elevation_m": 136.3744768030746,
   "min_gradient_pct": 4.240135560779109
  }
 ],
 "shape": {
  "ascent_concentration": 0.332,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 476.0,
  "shape_class": "sustained"
 },
 "length_m": 809.0000000000109,
 "start_elevation_m": 48.35651567272936,
 "end_elevation_m": 167.04169972577955,
 "endpoint_gain_m": 118.6851840530502,
 "overall_gradient_pct": 14.670603714839134,
 "accumulated_ascent_m": 119.94832453015897,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.764202879444497,
   "start_distance_m": 622.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 624.5,
   "start_elevation_m": 134.88626665910238,
   "end_elevation_m": 136.3744768030746,
   "start_xy": [
    321073.6103999002,
    189659.24651435096
   ],
   "end_xy": [
    321075.04135852045,
    189664.03737574318
   ]
  },
  "max_10m": {
   "gradient_pct": 24.39689455996671,
   "start_distance_m": 618.0,
   "end_distance_m": 628.0,
   "midpoint_distance_m": 623.0,
   "start_elevation_m": 133.998408721712,
   "end_elevation_m": 136.43809817770867,
   "start_xy": [
    321072.4664222574,
    189655.41358923982
   ],
   "end_xy": [
    321075.3274214612,
    189664.99558657277
   ]
  },
  "max_20m": {
   "gradient_pct": 22.607202291518576,
   "start_distance_m": 607.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 617.0,
   "start_elevation_m": 131.85303634477089,
   "end_elevation_m": 136.3744768030746,
   "start_xy": [
    321069.3202781495,
    189644.87310652883
   ],
   "end_xy": [
    321075.04135852045,
    189664.03737574318
   ]
  },
  "max_25m": {
   "gradient_pct": 21.859113310749308,
   "start_distance_m": 505.0,
   "end_distance_m": 530.0,
   "midpoint_distance_m": 517.5,
   "start_elevation_m": 110.80686090492259,
   "end_elevation_m": 116.27163923260991,
   "start_xy": [
    321079.4034309809,
    189546.37335830106
   ],
   "end_xy": [
    321072.58972243953,
    189570.4182593827
   ]
  },
  "max_50m": {
   "gradient_pct": 21.420648512616225,
   "start_distance_m": 505.0,
   "end_distance_m": 555.0,
   "midpoint_distance_m": 530.0,
   "start_elevation_m": 110.80686090492259,
   "end_elevation_m": 121.5171851612307,
   "start_xy": [
    321079.4034309809,
    189546.37335830106
   ],
   "end_xy": [
    321066.5536928939,
    189594.67864270936
   ]
  },
  "max_100m": {
   "gradient_pct": 20.786178026894223,
   "start_distance_m": 527.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 577.0,
   "start_elevation_m": 115.58829877618038,
   "end_elevation_m": 136.3744768030746,
   "start_xy": [
    321073.3136266807,
    189567.50690921047
   ],
   "end_xy": [
    321075.04135852045,
    189664.03737574318
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.4390330372025915,
   "start_distance_m": 338.0,
   "end_distance_m": 343.0,
   "midpoint_distance_m": 340.5,
   "start_elevation_m": 83.55985715538259,
   "end_elevation_m": 83.43790550352246,
   "start_xy": [
    321143.29463358154,
    189396.02847348546
   ],
   "end_xy": [
    321143.0866303254,
    189400.94974452385
   ]
  },
  "min_10m": {
   "gradient_pct": -0.8434302867222954,
   "start_distance_m": 111.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 116.0,
   "start_elevation_m": 54.184343410141956,
   "end_elevation_m": 54.10000038146973,
   "start_xy": [
    321154.2468090502,
    189182.5317104054
   ],
   "end_xy": [
    321147.0,
    189186.02152665352
   ]
  },
  "min_20m": {
   "gradient_pct": 0.3617898684588283,
   "start_distance_m": 101.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 111.0,
   "start_elevation_m": 54.02764240777796,
   "end_elevation_m": 54.10000038146973,
   "start_xy": [
    321164.2238649774,
    189181.85470659475
   ],
   "end_xy": [
    321147.0,
    189186.02152665352
   ]
  },
  "min_25m": {
   "gradient_pct": 0.6694046413077785,
   "start_distance_m": 96.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 108.5,
   "start_elevation_m": 53.93264922114278,
   "end_elevation_m": 54.10000038146973,
   "start_xy": [
    321169.2123616238,
    189181.51574089137
   ],
   "end_xy": [
    321147.0,
    189186.02152665352
   ]
  },
  "min_50m": {
   "gradient_pct": 3.116270755849328,
   "start_distance_m": 73.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 98.0,
   "start_elevation_m": 52.65729432285466,
   "end_elevation_m": 54.215429700779325,
   "start_xy": [
    321192.15952911414,
    189179.95772947918
   ],
   "end_xy": [
    321147.0,
    189188.02152665352
   ]
  },
  "min_100m": {
   "gradient_pct": 4.240135560779109,
   "start_distance_m": 35.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 85.0,
   "start_elevation_m": 51.14876349246152,
   "end_elevation_m": 55.38889905324063,
   "start_xy": [
    321222.7208813168,
    189168.91690616604
   ],
   "end_xy": [
    321147.0,
    189200.02152665352
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.58485443415512,
   "start_distance_m": 346.0,
   "end_distance_m": 348.0,
   "midpoint_distance_m": 347.0,
   "start_elevation_m": 84.41405296952071,
   "end_elevation_m": 85.30575005820381,
   "start_xy": [
    321142.66372657043,
    189403.919787012
   ],
   "end_xy": [
    321142.3827434096,
    189405.89995052846
   ]
  },
  "max_3m": {
   "gradient_pct": 35.958293006883935,
   "start_distance_m": 346.0,
   "end_distance_m": 349.0,
   "midpoint_distance_m": 347.5,
   "start_elevation_m": 84.41405296952071,
   "end_elevation_m": 85.49280175972723,
   "start_xy": [
    321142.66372657043,
    189403.919787012
   ],
   "end_xy": [
    321142.24174207007,
    189406.88995993361
   ]
  }
 },
 "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": 0.058,
   "windows_resited": [
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.32,
   "obstruction_max_height_m": 14.94,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    299.0,
    345.0
   ]
  ],
  "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_3_320189_20201201dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_3_321189_20201201dtm.tif"
  ],
  "calculated_at": "2026-09-15T21:26:33+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_3_320189_20201201dtm.tif",
   "wg_del_3_321189_20201201dtm.tif"
  ],
  "elevation_capture_dates": [
   "01-12-2020"
  ],
  "route_cut_m": 809.0,
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "structure_mask_ranges_m": [
   [
    310.3,
    340.3
   ],
   [
    305.6,
    335.6
   ],
   [
    304.4,
    334.4
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Machen",
  "county": "Caerffili - Caerphilly"
 }
}