{
 "ocl_version": "0.1.0",
 "name": "Sunningvale Avenue",
 "slug": "sunningvale-avenue",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.55843262463719,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 96.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 164.04572395726245,
   "end_elevation_m": 164.9768926097552,
   "min_gradient_pct": -13.796165430241558
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.96740855098642,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "start_elevation_m": 163.6578703532256,
   "end_elevation_m": 164.9768926097552,
   "min_gradient_pct": -11.810602679803614
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.95335730555473,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 95.0,
   "end_distance_m": 100.0,
   "start_elevation_m": 163.6578703532256,
   "end_elevation_m": 165.60553821850334,
   "min_gradient_pct": -9.405125243419548
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 32.09700243240576,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 92.0,
   "end_distance_m": 102.0,
   "start_elevation_m": 162.94698118439337,
   "end_elevation_m": 166.15668142763394,
   "min_gradient_pct": -3.8794965055691932
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 29.31486655181729,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 82.0,
   "end_distance_m": 102.0,
   "start_elevation_m": 160.29370811727048,
   "end_elevation_m": 166.15668142763394,
   "min_gradient_pct": 4.28528733787175
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.23778390106213,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 82.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 160.29370811727048,
   "end_elevation_m": 167.10315409253602,
   "min_gradient_pct": 5.519052319883713
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.79678015424037,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 57.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 156.70476401541583,
   "end_elevation_m": 167.10315409253602,
   "min_gradient_pct": 8.095990805006409
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.04410684338106,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 14.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 151.8439084596486,
   "end_elevation_m": 167.88801530302965,
   "min_gradient_pct": 10.535319905886809
  }
 ],
 "shape": {
  "ascent_concentration": 0.373,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 93.0,
  "shape_class": "sustained"
 },
 "length_m": 246.98518993450725,
 "start_elevation_m": 150.33195077891293,
 "end_elevation_m": 181.80724788085925,
 "endpoint_gain_m": 31.475297101946325,
 "overall_gradient_pct": 12.743799379344402,
 "accumulated_ascent_m": 32.196391628115435,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.95335730555473,
   "start_distance_m": 95.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 97.5,
   "start_elevation_m": 163.6578703532256,
   "end_elevation_m": 165.60553821850334,
   "start_xy": [
    541379.0595314129,
    159866.1222889241
   ],
   "end_xy": [
    541379.2496646452,
    159871.11867255167
   ]
  },
  "max_10m": {
   "gradient_pct": 32.09700243240576,
   "start_distance_m": 92.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 97.0,
   "start_elevation_m": 162.94698118439337,
   "end_elevation_m": 166.15668142763394,
   "start_xy": [
    541378.9454514736,
    159863.12445874754
   ],
   "end_xy": [
    541379.325717938,
    159873.1172260027
   ]
  },
  "max_20m": {
   "gradient_pct": 29.31486655181729,
   "start_distance_m": 82.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 92.0,
   "start_elevation_m": 160.29370811727048,
   "end_elevation_m": 166.15668142763394,
   "start_xy": [
    541378.565185009,
    159853.13169149237
   ],
   "end_xy": [
    541379.325717938,
    159873.1172260027
   ]
  },
  "max_25m": {
   "gradient_pct": 27.23778390106213,
   "start_distance_m": 82.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 94.5,
   "start_elevation_m": 160.29370811727048,
   "end_elevation_m": 167.10315409253602,
   "start_xy": [
    541378.565185009,
    159853.13169149237
   ],
   "end_xy": [
    541379.5158511703,
    159878.1136096303
   ]
  },
  "max_50m": {
   "gradient_pct": 20.79678015424037,
   "start_distance_m": 57.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 156.70476401541583,
   "end_elevation_m": 167.10315409253602,
   "start_xy": [
    541377.6145188478,
    159828.14977335444
   ],
   "end_xy": [
    541379.5158511703,
    159878.1136096303
   ]
  },
  "max_100m": {
   "gradient_pct": 16.04410684338106,
   "start_distance_m": 14.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 64.0,
   "start_elevation_m": 151.8439084596486,
   "end_elevation_m": 167.88801530302965,
   "start_xy": [
    541375.9793730504,
    159785.18087415723
   ],
   "end_xy": [
    541379.7820376955,
    159885.1085467089
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.405125243419548,
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 118.5,
   "start_elevation_m": 167.81930853751484,
   "end_elevation_m": 167.34905227534387,
   "start_xy": [
    541379.8580909884,
    159887.10710015995
   ],
   "end_xy": [
    541380.0482242206,
    159892.10348378753
   ]
  },
  "min_10m": {
   "gradient_pct": -3.8794965055691932,
   "start_distance_m": 113.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 118.0,
   "start_elevation_m": 167.72798888379234,
   "end_elevation_m": 167.34003923323542,
   "start_xy": [
    541379.744011049,
    159884.1092699834
   ],
   "end_xy": [
    541380.1242775136,
    159894.10203723857
   ]
  },
  "min_20m": {
   "gradient_pct": 4.28528733787175,
   "start_distance_m": 114.0,
   "end_distance_m": 134.0,
   "midpoint_distance_m": 124.0,
   "start_elevation_m": 167.88801530302965,
   "end_elevation_m": 168.745072770604,
   "start_xy": [
    541379.7820376955,
    159885.1085467089
   ],
   "end_xy": [
    541380.5425706245,
    159905.09408121926
   ]
  },
  "min_25m": {
   "gradient_pct": 5.519052319883713,
   "start_distance_m": 111.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 167.54550748247016,
   "end_elevation_m": 168.92527056244109,
   "start_xy": [
    541379.6679577561,
    159882.11071653236
   ],
   "end_xy": [
    541380.6186239175,
    159907.0926346703
   ]
  },
  "min_50m": {
   "gradient_pct": 8.095990805006409,
   "start_distance_m": 114.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 139.0,
   "start_elevation_m": 167.88801530302965,
   "end_elevation_m": 171.93601070553285,
   "start_xy": [
    541379.7820376955,
    159885.1085467089
   ],
   "end_xy": [
    541381.9412063333,
    159935.05998976878
   ]
  },
  "min_100m": {
   "gradient_pct": 10.535319905886809,
   "start_distance_m": 107.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 157.0,
   "start_elevation_m": 167.10315409253602,
   "end_elevation_m": 177.63847399842282,
   "start_xy": [
    541379.5158511703,
    159878.1136096303
   ],
   "end_xy": [
    541384.4459987754,
    159977.98697446164
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.55843262463719,
   "start_distance_m": 96.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 97.0,
   "start_elevation_m": 164.04572395726245,
   "end_elevation_m": 164.9768926097552,
   "start_xy": [
    541379.0975580594,
    159867.1215656496
   ],
   "end_xy": [
    541379.1736113522,
    159869.12011910064
   ]
  },
  "max_3m": {
   "gradient_pct": 43.96740855098642,
   "start_distance_m": 95.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 96.5,
   "start_elevation_m": 163.6578703532256,
   "end_elevation_m": 164.9768926097552,
   "start_xy": [
    541379.0595314129,
    159866.1222889241
   ],
   "end_xy": [
    541379.1736113522,
    159869.12011910064
   ]
  }
 },
 "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": 0.02,
   "obstruction_max_height_m": 7.41,
   "flagged_windows_m": []
  },
  "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/england/bulk_dtm_1m/TQ4055.tif",
   "data/cache/england/bulk_dtm_1m/TQ4060.tif"
  ],
  "calculated_at": "2026-08-15T11:49:55+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": [
   "TQ4055.tif",
   "TQ4060.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.1% over 200 m (Terrain 50), gain 28.1 m over 215 m way. EXTENDED by graph walk: +0 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": "Biggin Hill",
  "county": "Greater London"
 }
}