{
 "ocl_version": "0.1.0",
 "name": "Greystones Road",
 "slug": "greystones-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.2098622700444,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 134.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 99.06171276488918,
   "end_elevation_m": 99.92591001029007,
   "min_gradient_pct": -18.39651820389605
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.00336665872533,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 133.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 98.69580901052831,
   "end_elevation_m": 99.92591001029007,
   "min_gradient_pct": -11.79740252585475
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 36.79197196817569,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 131.0,
   "end_distance_m": 136.0,
   "start_elevation_m": 98.08631141188128,
   "end_elevation_m": 99.92591001029007,
   "min_gradient_pct": -4.231918459115036
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.887380325609627,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 127.0,
   "end_distance_m": 137.0,
   "start_elevation_m": 97.39200222630103,
   "end_elevation_m": 100.080740258862,
   "min_gradient_pct": -0.2091388954784179
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.090480227172904,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 169.0,
   "end_distance_m": 189.0,
   "start_elevation_m": 104.43911480741207,
   "end_elevation_m": 108.85721085284665,
   "min_gradient_pct": 0.6969301986556786
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.34945073741187,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 168.0,
   "end_distance_m": 193.0,
   "start_elevation_m": 104.28272638995978,
   "end_elevation_m": 109.62008907431274,
   "min_gradient_pct": 0.8762433000795795
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.180068999300346,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 165.0,
   "end_distance_m": 215.0,
   "start_elevation_m": 103.81189835989545,
   "end_elevation_m": 113.40193285954562,
   "min_gradient_pct": 1.6360104819459593
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.42088696751739,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 349.0,
   "end_distance_m": 449.0,
   "start_elevation_m": 133.89787128919974,
   "end_elevation_m": 152.31875825671713,
   "min_gradient_pct": 1.9066199345645032
  }
 ],
 "shape": {
  "ascent_concentration": 0.38,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 344.0,
  "shape_class": "sustained"
 },
 "length_m": 1764.6945156291492,
 "start_elevation_m": 89.90154511517292,
 "end_elevation_m": 272.48557308105535,
 "endpoint_gain_m": 182.58402796588243,
 "overall_gradient_pct": 10.346494894658157,
 "accumulated_ascent_m": 184.10945607902966,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 36.79197196817569,
   "start_distance_m": 131.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 133.5,
   "start_elevation_m": 98.08631141188128,
   "end_elevation_m": 99.92591001029007,
   "start_xy": [
    403825.7047735105,
    425096.50142319914
   ],
   "end_xy": [
    403829.5380809072,
    425099.71168049856
   ]
  },
  "max_10m": {
   "gradient_pct": 26.887380325609627,
   "start_distance_m": 127.0,
   "end_distance_m": 137.0,
   "midpoint_distance_m": 132.0,
   "start_elevation_m": 97.39200222630103,
   "end_elevation_m": 100.080740258862,
   "start_xy": [
    403822.6386715148,
    425093.932568032
   ],
   "end_xy": [
    403830.3046583753,
    425100.35383203044
   ]
  },
  "max_20m": {
   "gradient_pct": 22.090480227172904,
   "start_distance_m": 169.0,
   "end_distance_m": 189.0,
   "midpoint_distance_m": 179.0,
   "start_elevation_m": 104.43911480741207,
   "end_elevation_m": 108.85721085284665,
   "start_xy": [
    403859.59109681164,
    425112.64018387545
   ],
   "end_xy": [
    403878.4074751035,
    425119.1604163983
   ]
  },
  "max_25m": {
   "gradient_pct": 21.34945073741187,
   "start_distance_m": 168.0,
   "end_distance_m": 193.0,
   "midpoint_distance_m": 180.5,
   "start_elevation_m": 104.28272638995978,
   "end_elevation_m": 109.62008907431274,
   "start_xy": [
    403858.6620694049,
    425112.27017295995
   ],
   "end_xy": [
    403882.0320503909,
    425117.74002148584
   ]
  },
  "max_50m": {
   "gradient_pct": 19.180068999300346,
   "start_distance_m": 165.0,
   "end_distance_m": 215.0,
   "midpoint_distance_m": 190.0,
   "start_elevation_m": 103.81189835989545,
   "end_elevation_m": 113.40193285954562,
   "start_xy": [
    403855.8753313358,
    425111.15927728126
   ],
   "end_xy": [
    403885.85985946795,
    425096.3728563377
   ]
  },
  "max_100m": {
   "gradient_pct": 18.42088696751739,
   "start_distance_m": 349.0,
   "end_distance_m": 449.0,
   "midpoint_distance_m": 399.0,
   "start_elevation_m": 133.89787128919974,
   "end_elevation_m": 152.31875825671713,
   "start_xy": [
    404004.2951166155,
    425059.4258885038
   ],
   "end_xy": [
    404098.6124985694,
    425033.26857298263
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.231918459115036,
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 118.5,
   "start_elevation_m": 97.08092791634097,
   "end_elevation_m": 96.86933199338522,
   "start_xy": [
    403814.4198544229,
    425086.6289802723
   ],
   "end_xy": [
    403818.05070140015,
    425090.0662915007
   ]
  },
  "min_10m": {
   "gradient_pct": -0.2091388954784179,
   "start_distance_m": 110.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 115.0,
   "start_elevation_m": 96.92377050696884,
   "end_elevation_m": 96.902856617421,
   "start_xy": [
    403810.070107616,
    425082.496220893
   ],
   "end_xy": [
    403817.3188781242,
    425089.38500279665
   ]
  },
  "min_20m": {
   "gradient_pct": 0.6969301986556786,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 89.90154511517292,
   "end_elevation_m": 90.04093115490406,
   "start_xy": [
    403759.813,
    425087.502
   ],
   "end_xy": [
    403772.1738905355,
    425071.7791392218
   ]
  },
  "min_25m": {
   "gradient_pct": 0.8762433000795795,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 89.90154511517292,
   "end_elevation_m": 90.12060594019282,
   "start_xy": [
    403759.813,
    425087.502
   ],
   "end_xy": [
    403775.2638373523,
    425067.84820712585
   ]
  },
  "min_50m": {
   "gradient_pct": 1.6360104819459593,
   "start_distance_m": 1701.0,
   "end_distance_m": 1751.0,
   "midpoint_distance_m": 1726.0,
   "start_elevation_m": 271.3644536870865,
   "end_elevation_m": 272.1824589280595,
   "start_xy": [
    405207.60713393404,
    425273.1180413673
   ],
   "end_xy": [
    405253.6810580358,
    425292.5070914384
   ]
  },
  "min_100m": {
   "gradient_pct": 1.9066199345645032,
   "start_distance_m": 1659.0,
   "end_distance_m": 1759.0,
   "midpoint_distance_m": 1709.0,
   "start_elevation_m": 270.46082054919145,
   "end_elevation_m": 272.36744048375596,
   "start_xy": [
    405169.53993001743,
    425255.3729706372
   ],
   "end_xy": [
    405261.0960411873,
    425295.51009119354
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.2098622700444,
   "start_distance_m": 134.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 135.0,
   "start_elevation_m": 99.06171276488918,
   "end_elevation_m": 99.92591001029007,
   "start_xy": [
    403828.0048403756,
    425098.42747916706
   ],
   "end_xy": [
    403829.5380809072,
    425099.71168049856
   ]
  },
  "max_3m": {
   "gradient_pct": 41.00336665872533,
   "start_distance_m": 133.0,
   "end_distance_m": 136.0,
   "midpoint_distance_m": 134.5,
   "start_elevation_m": 98.69580901052831,
   "end_elevation_m": 99.92591001029007,
   "start_xy": [
    403827.2380140421,
    425097.7856245307
   ],
   "end_xy": [
    403829.5380809072,
    425099.71168049856
   ]
  }
 },
 "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": 0.007,
   "obstruction_max_height_m": 7.08,
   "flagged_windows_m": []
  },
  "review": [
   "short_window_divergence"
  ],
  "extent": []
 },
 "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/SE0020.tif",
   "data/cache/england/bulk_dtm_1m/SE0025.tif",
   "data/cache/england/bulk_dtm_1m/SE0525.tif"
  ],
  "calculated_at": "2026-08-19T18:35:28+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SE0020.tif",
   "SE0025.tif",
   "SE0525.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.9% over 200 m (Terrain 50), gain 48.2 m over 362 m way. EXTENDED by graph walk: +6 segment(s) at base, +5 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 4 overlapping proposal(s): butts-green-road, danny-lane, discovered-lane-53-7191-1-9375, john-naylor-lane ADOPTED (England launch slice 2026-08-16): clean-steep,endurance."
 },
 "area": {
  "place": "Luddenden Foot",
  "county": ""
 }
}