{
 "ocl_version": "0.1.0",
 "name": "Belmont Road",
 "slug": "belmont-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 15.29355237397887,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 53.116581721881744,
   "end_elevation_m": 53.42245276936132,
   "min_gradient_pct": -3.6419140297805797
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 15.163810057051089,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 52.96753846764979,
   "end_elevation_m": 53.42245276936132,
   "min_gradient_pct": -2.1539665872457667
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 15.006159362657456,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 76.0,
   "start_elevation_m": 52.96753846764979,
   "end_elevation_m": 53.71784643578266,
   "min_gradient_pct": -2.2921583609944207
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 14.878279551287932,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "start_elevation_m": 52.37728613781108,
   "end_elevation_m": 53.865114092939876,
   "min_gradient_pct": -1.0935835790424875
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 14.406822115416773,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 51.264869057504136,
   "end_elevation_m": 54.14623348058749,
   "min_gradient_pct": 1.3626825380594454
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 14.036278235190279,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 60.0,
   "end_distance_m": 85.0,
   "start_elevation_m": 51.3949297783826,
   "end_elevation_m": 54.90399933718017,
   "min_gradient_pct": 1.9333973656099772
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 12.549472076180777,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 41.0,
   "end_distance_m": 91.0,
   "start_elevation_m": 49.35112579667225,
   "end_elevation_m": 55.62586183476264,
   "min_gradient_pct": 2.242863796287139
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 11.409472062713881,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "start_elevation_m": 49.244093242409846,
   "end_elevation_m": 60.65356530512373,
   "min_gradient_pct": 2.712249705457495
  }
 ],
 "shape": {
  "ascent_concentration": 0.439,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 51.0,
  "shape_class": "sustained"
 },
 "length_m": 379.2961489055394,
 "start_elevation_m": 47.8418251443472,
 "end_elevation_m": 72.59196848056752,
 "endpoint_gain_m": 24.75014333622032,
 "overall_gradient_pct": 6.525282001316638,
 "accumulated_ascent_m": 25.020573770137034,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 15.006159362657456,
   "start_distance_m": 71.0,
   "end_distance_m": 76.0,
   "midpoint_distance_m": 73.5,
   "start_elevation_m": 52.96753846764979,
   "end_elevation_m": 53.71784643578266,
   "start_xy": [
    201433.2427550167,
    52024.81833607857
   ],
   "end_xy": [
    201438.00420032206,
    52026.344323825615
   ]
  },
  "max_10m": {
   "gradient_pct": 14.878279551287932,
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "midpoint_distance_m": 72.0,
   "start_elevation_m": 52.37728613781108,
   "end_elevation_m": 53.865114092939876,
   "start_xy": [
    201429.43359877242,
    52023.597545880926
   ],
   "end_xy": [
    201438.95648938313,
    52026.649521375024
   ]
  },
  "max_20m": {
   "gradient_pct": 14.406822115416773,
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 69.0,
   "start_elevation_m": 51.264869057504136,
   "end_elevation_m": 54.14623348058749,
   "start_xy": [
    201421.7655511504,
    52021.348537520746
   ],
   "end_xy": [
    201440.86106750526,
    52027.25991647385
   ]
  },
  "max_25m": {
   "gradient_pct": 14.036278235190279,
   "start_distance_m": 60.0,
   "end_distance_m": 85.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 51.3949297783826,
   "end_elevation_m": 54.90399933718017,
   "start_xy": [
    201422.7465321785,
    52021.54264115926
   ],
   "end_xy": [
    201446.57480187167,
    52029.091101770304
   ]
  },
  "max_50m": {
   "gradient_pct": 12.549472076180777,
   "start_distance_m": 41.0,
   "end_distance_m": 91.0,
   "midpoint_distance_m": 66.0,
   "start_elevation_m": 49.35112579667225,
   "end_elevation_m": 55.62586183476264,
   "start_xy": [
    201404.08381339777,
    52018.03372166595
   ],
   "end_xy": [
    201452.27230273714,
    52030.96928523211
   ]
  },
  "max_100m": {
   "gradient_pct": 11.409472062713881,
   "start_distance_m": 40.0,
   "end_distance_m": 140.0,
   "midpoint_distance_m": 90.0,
   "start_elevation_m": 49.244093242409846,
   "end_elevation_m": 60.65356530512373,
   "start_xy": [
    201403.08577704444,
    52017.97108431747
   ],
   "end_xy": [
    201492.04982326413,
    52055.063463973376
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.2921583609944207,
   "start_distance_m": 18.0,
   "end_distance_m": 23.0,
   "midpoint_distance_m": 20.5,
   "start_elevation_m": 48.44710942722013,
   "end_elevation_m": 48.332501509170406,
   "start_xy": [
    201384.30488053418,
    52028.56693564912
   ],
   "end_xy": [
    201388.2996582977,
    52025.57765935125
   ]
  },
  "min_10m": {
   "gradient_pct": -1.0935835790424875,
   "start_distance_m": 13.0,
   "end_distance_m": 23.0,
   "midpoint_distance_m": 18.0,
   "start_elevation_m": 48.441859867074655,
   "end_elevation_m": 48.332501509170406,
   "start_xy": [
    201380.45241371915,
    52031.75417574659
   ],
   "end_xy": [
    201388.2996582977,
    52025.57765935125
   ]
  },
  "min_20m": {
   "gradient_pct": 1.3626825380594454,
   "start_distance_m": 9.0,
   "end_distance_m": 29.0,
   "midpoint_distance_m": 19.0,
   "start_elevation_m": 48.340489562026775,
   "end_elevation_m": 48.613026069638664,
   "start_xy": [
    201377.37044026708,
    52034.30396782456
   ],
   "end_xy": [
    201393.39785891888,
    52022.414061648255
   ]
  },
  "min_25m": {
   "gradient_pct": 1.9333973656099772,
   "start_distance_m": 9.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 21.5,
   "start_elevation_m": 48.340489562026775,
   "end_elevation_m": 48.82383890342927,
   "start_xy": [
    201377.37044026708,
    52034.30396782456
   ],
   "end_xy": [
    201397.6463594365,
    52019.77773022909
   ]
  },
  "min_50m": {
   "gradient_pct": 2.242863796287139,
   "start_distance_m": 204.0,
   "end_distance_m": 254.0,
   "midpoint_distance_m": 229.0,
   "start_elevation_m": 65.76173000229433,
   "end_elevation_m": 66.8831619004379,
   "start_xy": [
    201535.52481725442,
    52100.78499696092
   ],
   "end_xy": [
    201577.85285499593,
    52127.38603720933
   ]
  },
  "min_100m": {
   "gradient_pct": 2.712249705457495,
   "start_distance_m": 205.0,
   "end_distance_m": 305.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 65.77382841465631,
   "end_elevation_m": 68.4860781201138,
   "start_xy": [
    201536.36594726073,
    52101.325829941154
   ],
   "end_xy": [
    201621.65316620044,
    52153.317928811884
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 15.29355237397887,
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 73.0,
   "start_elevation_m": 53.116581721881744,
   "end_elevation_m": 53.42245276936132,
   "start_xy": [
    201434.19504407776,
    52025.12353362798
   ],
   "end_xy": [
    201436.0996221999,
    52025.7339287268
   ]
  },
  "max_3m": {
   "gradient_pct": 15.163810057051089,
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 52.96753846764979,
   "end_elevation_m": 53.42245276936132,
   "start_xy": [
    201433.2427550167,
    52024.81833607857
   ],
   "end_xy": [
    201436.0996221999,
    52025.7339287268
   ]
  }
 },
 "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": 0.01,
   "obstruction_max_height_m": 9.22,
   "flagged_windows_m": []
  },
  "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/england/bulk_dtm_1m/SX0050.tif"
  ],
  "calculated_at": "2026-08-14T23:45:32+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "elevation_provider": "Environment Agency",
  "elevation_dataset": "EA LIDAR Composite DTM 1m (2022)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Environment Agency",
  "elevation_coverage_id": "13787b9a-26a4-4775-8523-806d13af58fc__Lidar_Composite_Elevation_DTM_1m",
  "elevation_tile_ids": [
   "SX0050.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 8.6% over 200 m (Terrain 50), gain 22.2 m over 312 m way. EXTENDED by graph walk: +1 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
 },
 "area": {
  "place": "St Austell",
  "county": "Cornwall"
 }
}