{
 "ocl_version": "0.1.0",
 "name": "Hill Street",
 "slug": "hill-street-3",
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.98066703549887,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "no_bench_excluded"
   ],
   "start_distance_m": 635.0,
   "end_distance_m": 637.0,
   "start_elevation_m": 304.2355727969559,
   "end_elevation_m": 304.9151861376659,
   "min_gradient_pct": -11.168413514141662,
   "suppressed_max_gradient_pct": 36.41681120392093,
   "suppressed_location_m": [
    603.0,
    605.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.59413592849114,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 634.0,
   "end_distance_m": 637.0,
   "start_elevation_m": 303.93736205981116,
   "end_elevation_m": 304.9151861376659,
   "min_gradient_pct": -7.864983557838438
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.09363172101223,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 12.0,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 235.04355131199213,
   "min_gradient_pct": -7.419945914266464
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 28.27571892436481,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 17.0,
   "end_distance_m": 27.0,
   "start_elevation_m": 236.37391745749238,
   "end_elevation_m": 239.20148934992886,
   "min_gradient_pct": -2.9388313479387307
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.06309811993671,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 27.0,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 239.20148934992886,
   "min_gradient_pct": -1.470417182927406
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.903052442117655,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 32.0,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 240.56463283647093,
   "min_gradient_pct": -1.339956188450742
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 25.91370195528697,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5.0,
   "end_distance_m": 55.0,
   "start_elevation_m": 233.08041126375718,
   "end_elevation_m": 246.03726224140067,
   "min_gradient_pct": -0.5726689952474544
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.107385715160632,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3.0,
   "end_distance_m": 103.0,
   "start_elevation_m": 232.8568387033849,
   "end_elevation_m": 251.96422441854554,
   "min_gradient_pct": 0.7288725292283971
  }
 ],
 "length_m": 1696.8673606064572,
 "start_elevation_m": 232.8953696823118,
 "end_elevation_m": 378.8757909432976,
 "endpoint_gain_m": 145.9804212609858,
 "overall_gradient_pct": 8.602936484606118,
 "accumulated_ascent_m": 149.01535473221298,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.09363172101223,
   "start_distance_m": 7.0,
   "end_distance_m": 12.0,
   "midpoint_distance_m": 9.5,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 235.04355131199213,
   "start_xy": [
    312974.54644100956,
    201632.88517704874
   ],
   "end_xy": [
    312978.5718448132,
    201635.85100310866
   ]
  },
  "max_10m": {
   "gradient_pct": 28.27571892436481,
   "start_distance_m": 17.0,
   "end_distance_m": 27.0,
   "midpoint_distance_m": 22.0,
   "start_elevation_m": 236.37391745749238,
   "end_elevation_m": 239.20148934992886,
   "start_xy": [
    312982.59724861686,
    201638.8168291686
   ],
   "end_xy": [
    312990.6480562241,
    201644.74848128844
   ]
  },
  "max_20m": {
   "gradient_pct": 28.06309811993671,
   "start_distance_m": 7.0,
   "end_distance_m": 27.0,
   "midpoint_distance_m": 17.0,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 239.20148934992886,
   "start_xy": [
    312974.54644100956,
    201632.88517704874
   ],
   "end_xy": [
    312990.6480562241,
    201644.74848128844
   ]
  },
  "max_25m": {
   "gradient_pct": 27.903052442117655,
   "start_distance_m": 7.0,
   "end_distance_m": 32.0,
   "midpoint_distance_m": 19.5,
   "start_elevation_m": 233.58886972594152,
   "end_elevation_m": 240.56463283647093,
   "start_xy": [
    312974.54644100956,
    201632.88517704874
   ],
   "end_xy": [
    312994.6734600277,
    201647.71430734836
   ]
  },
  "max_50m": {
   "gradient_pct": 25.91370195528697,
   "start_distance_m": 5.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 30.0,
   "start_elevation_m": 233.08041126375718,
   "end_elevation_m": 246.03726224140067,
   "start_xy": [
    312972.93627948815,
    201631.69884662476
   ],
   "end_xy": [
    313012.71404562384,
    201661.97434773404
   ]
  },
  "max_100m": {
   "gradient_pct": 19.107385715160632,
   "start_distance_m": 3.0,
   "end_distance_m": 103.0,
   "midpoint_distance_m": 53.0,
   "start_elevation_m": 232.8568387033849,
   "end_elevation_m": 251.96422441854554,
   "start_xy": [
    312971.3268229369,
    201630.51156684992
   ],
   "end_xy": [
    313010.78764468466,
    201702.84262883363
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.419945914266464,
   "start_distance_m": 281.0,
   "end_distance_m": 286.0,
   "midpoint_distance_m": 283.5,
   "start_elevation_m": 258.04548642416887,
   "end_elevation_m": 257.67448912845555,
   "start_xy": [
    312914.36271132214,
    201850.72769791272
   ],
   "end_xy": [
    312911.51662376686,
    201854.79788636678
   ]
  },
  "min_10m": {
   "gradient_pct": -2.9388313479387307,
   "start_distance_m": 223.0,
   "end_distance_m": 233.0,
   "midpoint_distance_m": 228.0,
   "start_elevation_m": 257.3253326128875,
   "end_elevation_m": 257.03144947809363,
   "start_xy": [
    312944.7906891577,
    201801.47278966088
   ],
   "end_xy": [
    312940.1009070059,
    201810.30050194613
   ]
  },
  "min_20m": {
   "gradient_pct": -1.470417182927406,
   "start_distance_m": 1598.0,
   "end_distance_m": 1618.0,
   "midpoint_distance_m": 1608.0,
   "start_elevation_m": 377.819042651319,
   "end_elevation_m": 377.52495921473354,
   "start_xy": [
    313463.9383013688,
    201937.84556872235
   ],
   "end_xy": [
    313473.05761027284,
    201954.8801596769
   ]
  },
  "min_25m": {
   "gradient_pct": -1.339956188450742,
   "start_distance_m": 1598.0,
   "end_distance_m": 1623.0,
   "midpoint_distance_m": 1610.5,
   "start_elevation_m": 377.819042651319,
   "end_elevation_m": 377.48405360420634,
   "start_xy": [
    313463.9383013688,
    201937.84556872235
   ],
   "end_xy": [
    313473.15260910126,
    201959.8792571177
   ]
  },
  "min_50m": {
   "gradient_pct": -0.5726689952474544,
   "start_distance_m": 1589.0,
   "end_distance_m": 1639.0,
   "midpoint_distance_m": 1614.0,
   "start_elevation_m": 377.76011415072725,
   "end_elevation_m": 377.4737796531035,
   "start_xy": [
    313458.95319061796,
    201930.37237271792
   ],
   "end_xy": [
    313469.9054872726,
    201975.49428134464
   ]
  },
  "min_100m": {
   "gradient_pct": 0.7288725292283971,
   "start_distance_m": 1586.0,
   "end_distance_m": 1686.0,
   "midpoint_distance_m": 1636.0,
   "start_elevation_m": 377.7349668897898,
   "end_elevation_m": 378.4638394190182,
   "start_xy": [
    313457.4936981234,
    201927.75132680874
   ],
   "end_xy": [
    313445.36954257864,
    202005.45619025774
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.98066703549887,
   "start_distance_m": 635.0,
   "end_distance_m": 637.0,
   "midpoint_distance_m": 636.0,
   "start_elevation_m": 304.2355727969559,
   "end_elevation_m": 304.9151861376659,
   "start_xy": [
    313196.9303222438,
    201655.57786848466
   ],
   "end_xy": [
    313198.4916527815,
    201654.32796970793
   ]
  },
  "max_3m": {
   "gradient_pct": 32.59413592849114,
   "start_distance_m": 634.0,
   "end_distance_m": 637.0,
   "midpoint_distance_m": 635.5,
   "start_elevation_m": 303.93736205981116,
   "end_elevation_m": 304.9151861376659,
   "start_xy": [
    313196.14965697494,
    201656.20281787304
   ],
   "end_xy": [
    313198.4916527815,
    201654.32796970793
   ]
  }
 },
 "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": 0.426,
   "obstruction_max_height_m": 28.54,
   "flagged_windows_m": [
    2,
    3
   ]
  },
  "no_bench_suppression": {
   "masked_fraction": 0.018,
   "windows_resited": [
    2.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    600.0,
    630.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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_10_312201_20210227dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_10_312202_20210227dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_10_313201_20210227dtm.tif",
   "data/cache/wales/dtm_1m/wg_del_10_313202_20210227dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:10:41+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_10_312201_20210227dtm.tif",
   "wg_del_10_312202_20210227dtm.tif",
   "wg_del_10_313201_20210227dtm.tif",
   "wg_del_10_313202_20210227dtm.tif"
  ],
  "elevation_capture_dates": [
   "27-02-2021"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.5% over 200 m (Terrain 50), gain 26.2 m over 286 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): cefn-road ADOPTED (notable slice 2026-08-11): qualified-steep."
 },
 "area": {
  "place": "Cwm Ysgwydd-gwyn",
  "county": "Caerffili - Caerphilly"
 },
 "reported_claims": [],
 "confidence": "A",
 "shape": {
  "ascent_concentration": 0.409,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 175.0,
  "shape_class": "sustained"
 }
}