{
 "ocl_version": "0.1.0",
 "name": "Ty Canol Lane",
 "slug": "ty-canol-lane-2",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 39.74728533619327,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1501.0,
   "end_distance_m": 1503.0,
   "start_elevation_m": 248.18301105306193,
   "end_elevation_m": 248.9779567597858,
   "min_gradient_pct": -4.012450834318315
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.35034716232136,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1500.0,
   "end_distance_m": 1503.0,
   "start_elevation_m": 247.88744634491616,
   "end_elevation_m": 248.9779567597858,
   "min_gradient_pct": -3.495163674794336
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.83923711193495,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1501.0,
   "end_distance_m": 1506.0,
   "start_elevation_m": 248.18301105306193,
   "end_elevation_m": 249.57497290865868,
   "min_gradient_pct": -0.3154843347624592
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.76197177653529,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1499.0,
   "end_distance_m": 1509.0,
   "start_elevation_m": 247.70370556527422,
   "end_elevation_m": 249.97990274292775,
   "min_gradient_pct": 2.108012578270859
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 18.966113997188287,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 48.0,
   "end_distance_m": 68.0,
   "start_elevation_m": 85.80059680375977,
   "end_elevation_m": 89.59381960319743,
   "min_gradient_pct": 2.755083633379627
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 18.862189775217246,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 55.0,
   "end_distance_m": 80.0,
   "start_elevation_m": 87.1177100564312,
   "end_elevation_m": 91.83325750023552,
   "min_gradient_pct": 2.959026065049102
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.70477177413767,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 43.0,
   "end_distance_m": 93.0,
   "start_elevation_m": 84.96487465317321,
   "end_elevation_m": 93.81726054024205,
   "min_gradient_pct": 3.2447839290456386
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.481701063804252,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 43.0,
   "end_distance_m": 143.0,
   "start_elevation_m": 84.96487465317321,
   "end_elevation_m": 101.44657571697746,
   "min_gradient_pct": 3.595790029158593
  }
 ],
 "length_m": 2032.86577848957,
 "start_elevation_m": 78.6575804805289,
 "end_elevation_m": 288.68439772057997,
 "endpoint_gain_m": 210.02681724005106,
 "overall_gradient_pct": 10.331563424521914,
 "accumulated_ascent_m": 210.58833339576,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.83923711193495,
   "start_distance_m": 1501.0,
   "end_distance_m": 1506.0,
   "midpoint_distance_m": 1503.5,
   "start_elevation_m": 248.18301105306193,
   "end_elevation_m": 249.57497290865868,
   "start_xy": [
    319543.9869095555,
    190053.3349648373
   ],
   "end_xy": [
    319540.26209789206,
    190056.6704974892
   ]
  },
  "max_10m": {
   "gradient_pct": 22.76197177653529,
   "start_distance_m": 1499.0,
   "end_distance_m": 1509.0,
   "midpoint_distance_m": 1504.0,
   "start_elevation_m": 247.70370556527422,
   "end_elevation_m": 249.97990274292775,
   "start_xy": [
    319545.47683422087,
    190052.00075177653
   ],
   "end_xy": [
    319538.027210894,
    190058.67181708035
   ]
  },
  "max_20m": {
   "gradient_pct": 18.966113997188287,
   "start_distance_m": 48.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 58.0,
   "start_elevation_m": 85.80059680375977,
   "end_elevation_m": 89.59381960319743,
   "start_xy": [
    320751.0492479927,
    189373.04913996145
   ],
   "end_xy": [
    320731.45784686686,
    189377.0712043475
   ]
  },
  "max_25m": {
   "gradient_pct": 18.862189775217246,
   "start_distance_m": 55.0,
   "end_distance_m": 80.0,
   "midpoint_distance_m": 67.5,
   "start_elevation_m": 87.1177100564312,
   "end_elevation_m": 91.83325750023552,
   "start_xy": [
    320744.1922575987,
    189374.45686249656
   ],
   "end_xy": [
    320719.536725706,
    189378.3907223277
   ]
  },
  "max_50m": {
   "gradient_pct": 17.70477177413767,
   "start_distance_m": 43.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 68.0,
   "start_elevation_m": 84.96487465317321,
   "end_elevation_m": 93.81726054024205,
   "start_xy": [
    320755.8531885194,
    189371.696354743
   ],
   "end_xy": [
    320706.65984684386,
    189377.16376021196
   ]
  },
  "max_100m": {
   "gradient_pct": 16.481701063804252,
   "start_distance_m": 43.0,
   "end_distance_m": 143.0,
   "midpoint_distance_m": 93.0,
   "start_elevation_m": 84.96487465317321,
   "end_elevation_m": 101.44657571697746,
   "start_xy": [
    320755.8531885194,
    189371.696354743
   ],
   "end_xy": [
    320659.887548842,
    189386.62689915058
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.3154843347624592,
   "start_distance_m": 1527.0,
   "end_distance_m": 1532.0,
   "midpoint_distance_m": 1529.5,
   "start_elevation_m": 251.52880216431151,
   "end_elevation_m": 251.5130279475734,
   "start_xy": [
    319528.23591605684,
    190073.48785008412
   ],
   "end_xy": [
    319525.9289173572,
    190077.92381187383
   ]
  },
  "min_10m": {
   "gradient_pct": 2.108012578270859,
   "start_distance_m": 1922.0,
   "end_distance_m": 1932.0,
   "midpoint_distance_m": 1927.0,
   "start_elevation_m": 282.6638632084988,
   "end_elevation_m": 282.8746644663259,
   "start_xy": [
    319196.13294433843,
    190279.1356391612
   ],
   "end_xy": [
    319188.4666355479,
    190285.55651990525
   ]
  },
  "min_20m": {
   "gradient_pct": 2.755083633379627,
   "start_distance_m": 1920.0,
   "end_distance_m": 1940.0,
   "midpoint_distance_m": 1930.0,
   "start_elevation_m": 282.61234760847316,
   "end_elevation_m": 283.1633643351491,
   "start_xy": [
    319197.66620609653,
    190277.8514630124
   ],
   "end_xy": [
    319182.3335885156,
    190290.69322450046
   ]
  },
  "min_25m": {
   "gradient_pct": 2.959026065049102,
   "start_distance_m": 1920.0,
   "end_distance_m": 1945.0,
   "midpoint_distance_m": 1932.5,
   "start_elevation_m": 282.61234760847316,
   "end_elevation_m": 283.35210412473543,
   "start_xy": [
    319197.66620609653,
    190277.8514630124
   ],
   "end_xy": [
    319178.50043412036,
    190293.9036648725
   ]
  },
  "min_50m": {
   "gradient_pct": 3.2447839290456386,
   "start_distance_m": 1920.0,
   "end_distance_m": 1970.0,
   "midpoint_distance_m": 1945.0,
   "start_elevation_m": 282.61234760847316,
   "end_elevation_m": 284.234739572996,
   "start_xy": [
    319197.66620609653,
    190277.8514630124
   ],
   "end_xy": [
    319158.1048692229,
    190308.33793783368
   ]
  },
  "min_100m": {
   "gradient_pct": 3.595790029158593,
   "start_distance_m": 1879.0,
   "end_distance_m": 1979.0,
   "midpoint_distance_m": 1929.0,
   "start_elevation_m": 280.9719936009088,
   "end_elevation_m": 284.56778363006737,
   "start_xy": [
    319231.70077593747,
    190255.0556393464
   ],
   "end_xy": [
    319150.690355979,
    190313.4394075588
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 39.74728533619327,
   "start_distance_m": 1501.0,
   "end_distance_m": 1503.0,
   "midpoint_distance_m": 1502.0,
   "start_elevation_m": 248.18301105306193,
   "end_elevation_m": 248.9779567597858,
   "start_xy": [
    319543.9869095555,
    190053.3349648373
   ],
   "end_xy": [
    319542.49698489014,
    190054.66917789806
   ]
  },
  "max_3m": {
   "gradient_pct": 36.35034716232136,
   "start_distance_m": 1500.0,
   "end_distance_m": 1503.0,
   "midpoint_distance_m": 1501.5,
   "start_elevation_m": 247.88744634491616,
   "end_elevation_m": 248.9779567597858,
   "start_xy": [
    319544.73187188816,
    190052.66785830693
   ],
   "end_xy": [
    319542.49698489014,
    190054.66917789806
   ]
  }
 },
 "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": 0.49,
   "obstruction_max_height_m": 25.63,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "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_3_319189_20201201dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_3_319190_20201201dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_3_320189_20201201dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_3_320190_20201201dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:11:27+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_3_319189_20201201dtm.tif",
   "wg_del_3_319190_20201201dtm.tif",
   "wg_del_3_320189_20201201dtm.tif",
   "wg_del_3_320190_20201201dtm.tif"
  ],
  "elevation_capture_dates": [
   "01-12-2020"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 16.5% over 200 m (Terrain 50), gain 206.8 m over 2025 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): endurance."
 },
 "area": {
  "place": "Machen",
  "county": "Caerffili - Caerphilly"
 },
 "reported_claims": [],
 "confidence": "B",
 "shape": {
  "ascent_concentration": 0.31,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 335.0,
  "shape_class": "sustained"
 }
}