{
 "ocl_version": "0.1.0",
 "name": "Chesterfield Road",
 "slug": "chesterfield-road-6",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 55.23456672257652,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 771.0,
   "end_distance_m": 773.0,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 207.06143696851223,
   "min_gradient_pct": -13.163641429390793
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 51.5879195950987,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 771.0,
   "end_distance_m": 774.0,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 207.50438322191366,
   "min_gradient_pct": -11.564983928189084
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 48.01340343511413,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 771.0,
   "end_distance_m": 776.0,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 208.3574158058164,
   "min_gradient_pct": -8.9340669847752
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 36.01872860920878,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 770.0,
   "end_distance_m": 780.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 209.1836273651826,
   "min_gradient_pct": -6.958396537234535
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.325167478292997,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 770.0,
   "end_distance_m": 790.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 210.8467879999203,
   "min_gradient_pct": 2.3543710221267133
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.7424375908314,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 770.0,
   "end_distance_m": 795.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 211.76736390196956,
   "min_gradient_pct": 4.716751544318413
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.342018711970695,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 770.0,
   "end_distance_m": 820.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 215.75276386024706,
   "min_gradient_pct": 8.002668697686829
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.30999618649375,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 770.0,
   "end_distance_m": 870.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 223.89175069075546,
   "min_gradient_pct": 9.082785177195845
  }
 ],
 "shape": {
  "ascent_concentration": 0.319,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 253.0,
  "shape_class": "sustained"
 },
 "length_m": 1021.5190026698205,
 "start_elevation_m": 113.12452179589839,
 "end_elevation_m": 246.9702514250167,
 "endpoint_gain_m": 133.8457296291183,
 "overall_gradient_pct": 13.102617697693525,
 "accumulated_ascent_m": 134.98406122546805,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 48.01340343511413,
   "start_distance_m": 771.0,
   "end_distance_m": 776.0,
   "midpoint_distance_m": 773.5,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 208.3574158058164,
   "start_xy": [
    426611.76914818183,
    365862.47041239997
   ],
   "end_xy": [
    426614.69657753996,
    365866.39371623215
   ]
  },
  "max_10m": {
   "gradient_pct": 36.01872860920878,
   "start_distance_m": 770.0,
   "end_distance_m": 780.0,
   "midpoint_distance_m": 775.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 209.1836273651826,
   "start_xy": [
    426611.2423099976,
    365861.6204467961
   ],
   "end_xy": [
    426618.3025919828,
    365868.1248025494
   ]
  },
  "max_20m": {
   "gradient_pct": 26.325167478292997,
   "start_distance_m": 770.0,
   "end_distance_m": 790.0,
   "midpoint_distance_m": 780.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 210.8467879999203,
   "start_xy": [
    426611.2423099976,
    365861.6204467961
   ],
   "end_xy": [
    426627.73462475004,
    365867.3034608433
   ]
  },
  "max_25m": {
   "gradient_pct": 24.7424375908314,
   "start_distance_m": 770.0,
   "end_distance_m": 795.0,
   "midpoint_distance_m": 782.5,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 211.76736390196956,
   "start_xy": [
    426611.2423099976,
    365861.6204467961
   ],
   "end_xy": [
    426630.7864275671,
    365863.48048952693
   ]
  },
  "max_50m": {
   "gradient_pct": 20.342018711970695,
   "start_distance_m": 770.0,
   "end_distance_m": 820.0,
   "midpoint_distance_m": 795.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 215.75276386024706,
   "start_xy": [
    426611.2423099976,
    365861.6204467961
   ],
   "end_xy": [
    426641.11326517415,
    365840.72349217464
   ]
  },
  "max_100m": {
   "gradient_pct": 18.30999618649375,
   "start_distance_m": 770.0,
   "end_distance_m": 870.0,
   "midpoint_distance_m": 820.0,
   "start_elevation_m": 205.5817545042617,
   "end_elevation_m": 223.89175069075546,
   "start_xy": [
    426611.2423099976,
    365861.6204467961
   ],
   "end_xy": [
    426663.2290087063,
    365795.894110558
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.9340669847752,
   "start_distance_m": 759.0,
   "end_distance_m": 764.0,
   "midpoint_distance_m": 761.5,
   "start_elevation_m": 206.15731780576,
   "end_elevation_m": 205.71061445652123,
   "start_xy": [
    426611.50795263564,
    365850.63183216884
   ],
   "end_xy": [
    426611.3746416673,
    365855.6300546715
   ]
  },
  "min_10m": {
   "gradient_pct": -6.958396537234535,
   "start_distance_m": 759.0,
   "end_distance_m": 769.0,
   "midpoint_distance_m": 764.0,
   "start_elevation_m": 206.15731780576,
   "end_elevation_m": 205.46147815203653,
   "start_xy": [
    426611.50795263564,
    365850.63183216884
   ],
   "end_xy": [
    426611.24133069895,
    365860.62827717414
   ]
  },
  "min_20m": {
   "gradient_pct": 2.3543710221267133,
   "start_distance_m": 749.0,
   "end_distance_m": 769.0,
   "midpoint_distance_m": 759.0,
   "start_elevation_m": 204.9906039476112,
   "end_elevation_m": 205.46147815203653,
   "start_xy": [
    426611.7745745723,
    365840.6353871636
   ],
   "end_xy": [
    426611.24133069895,
    365860.62827717414
   ]
  },
  "min_25m": {
   "gradient_pct": 4.716751544318413,
   "start_distance_m": 745.0,
   "end_distance_m": 770.0,
   "midpoint_distance_m": 757.5,
   "start_elevation_m": 204.4025666181821,
   "end_elevation_m": 205.5817545042617,
   "start_xy": [
    426611.8812233469,
    365836.6368091615
   ],
   "end_xy": [
    426611.2423099976,
    365861.6204467961
   ]
  },
  "min_50m": {
   "gradient_pct": 8.002668697686829,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 113.12452179589839,
   "end_elevation_m": 117.1258561447418,
   "start_xy": [
    426005.516,
    366104.882
   ],
   "end_xy": [
    426055.47167631815,
    366106.4772558861
   ]
  },
  "min_100m": {
   "gradient_pct": 9.082785177195845,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 113.12452179589839,
   "end_elevation_m": 122.20730697309423,
   "start_xy": [
    426005.516,
    366104.882
   ],
   "end_xy": [
    426105.4297096947,
    366104.42911010346
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 55.23456672257652,
   "start_distance_m": 771.0,
   "end_distance_m": 773.0,
   "midpoint_distance_m": 772.0,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 207.06143696851223,
   "start_xy": [
    426611.76914818183,
    365862.47041239997
   ],
   "end_xy": [
    426612.82282455015,
    365864.1703436076
   ]
  },
  "max_3m": {
   "gradient_pct": 51.5879195950987,
   "start_distance_m": 771.0,
   "end_distance_m": 774.0,
   "midpoint_distance_m": 772.5,
   "start_elevation_m": 205.9567456340607,
   "end_elevation_m": 207.50438322191366,
   "start_xy": [
    426611.76914818183,
    365862.47041239997
   ],
   "end_xy": [
    426613.34966273437,
    365865.02030921145
   ]
  }
 },
 "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": 0.069,
   "obstruction_max_height_m": 11.83,
   "flagged_windows_m": []
  },
  "review": [
   "max5_over_45",
   "short_window_divergence"
  ],
  "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/england/bulk_dtm_1m/SK2565.tif"
  ],
  "calculated_at": "2026-08-15T17:49:27+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": [
   "SK2565.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.2% over 200 m (Terrain 50), gain 27.8 m over 218 m way. EXTENDED by graph walk: +3 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 3 overlapping proposal(s): chesterfield-road-5, chesterfield-road-8, chesterfield-road-9"
 },
 "area": {
  "place": "Tinkersley",
  "county": "Derbyshire"
 }
}