{
 "ocl_version": "0.1.0",
 "name": "Challick Lane",
 "slug": "challick-lane-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.59852896164267,
   "diagnostic": true,
   "flags": [
    "placement_excluded"
   ],
   "start_distance_m": 699.0,
   "end_distance_m": 701.0,
   "start_elevation_m": 190.7555672940299,
   "end_elevation_m": 191.68753787326276,
   "min_gradient_pct": -40.79201960225447,
   "suppressed_max_gradient_pct": 52.14763769787538,
   "suppressed_location_m": [
    113.0,
    115.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.97607322081092,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 699.0,
   "end_distance_m": 702.0,
   "start_elevation_m": 190.7555672940299,
   "end_elevation_m": 192.04484949065423,
   "min_gradient_pct": -33.78181359753967
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.195310703313226,
   "diagnostic": false,
   "flags": [
    "placement_excluded"
   ],
   "start_distance_m": 578.0,
   "end_distance_m": 583.0,
   "start_elevation_m": 173.9351273657603,
   "end_elevation_m": 175.84489290092597,
   "min_gradient_pct": -23.080098285085455,
   "suppressed_max_gradient_pct": 39.181409873092434,
   "suppressed_location_m": [
    167.0,
    172.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.295328677804036,
   "diagnostic": false,
   "flags": [
    "placement_excluded"
   ],
   "start_distance_m": 695.0,
   "end_distance_m": 705.0,
   "start_elevation_m": 189.79777104728228,
   "end_elevation_m": 192.82730391506269,
   "min_gradient_pct": -15.333380627209863,
   "suppressed_max_gradient_pct": 30.71324197528554,
   "suppressed_location_m": [
    164.0,
    174.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.743224894964357,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 685.0,
   "end_distance_m": 705.0,
   "start_elevation_m": 188.07865893606981,
   "end_elevation_m": 192.82730391506269,
   "min_gradient_pct": -7.102736837693584
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.820297666509873,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 681.0,
   "end_distance_m": 706.0,
   "start_elevation_m": 187.29761995628445,
   "end_elevation_m": 193.00269437291192,
   "min_gradient_pct": -6.84112615085246
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.559807207690596,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 657.0,
   "end_distance_m": 707.0,
   "start_elevation_m": 183.3799387489516,
   "end_elevation_m": 193.1598423527969,
   "min_gradient_pct": -1.2780075370645818
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.9149532538801,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 631.0,
   "end_distance_m": 731.0,
   "start_elevation_m": 179.7743298913207,
   "end_elevation_m": 196.6892831452008,
   "min_gradient_pct": 1.246213145757764
  }
 ],
 "shape": {
  "ascent_concentration": 0.332,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 241.0,
  "shape_class": "sustained"
 },
 "length_m": 1317.9999999999825,
 "start_elevation_m": 131.70842311941436,
 "end_elevation_m": 260.98407764386246,
 "endpoint_gain_m": 129.2756545244481,
 "overall_gradient_pct": 9.8084715117185,
 "accumulated_ascent_m": 138.1007738716758,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.195310703313226,
   "start_distance_m": 578.0,
   "end_distance_m": 583.0,
   "midpoint_distance_m": 580.5,
   "start_elevation_m": 173.9351273657603,
   "end_elevation_m": 175.84489290092597,
   "start_xy": [
    307117.29475161625,
    127487.89640460612
   ],
   "end_xy": [
    307113.97134955577,
    127491.63204360697
   ]
  },
  "max_10m": {
   "gradient_pct": 30.295328677804036,
   "start_distance_m": 695.0,
   "end_distance_m": 705.0,
   "midpoint_distance_m": 700.0,
   "start_elevation_m": 189.79777104728228,
   "end_elevation_m": 192.82730391506269,
   "start_xy": [
    307045.8888970916,
    127580.03827156132
   ],
   "end_xy": [
    307038.3769707622,
    127586.58417458124
   ]
  },
  "max_20m": {
   "gradient_pct": 23.743224894964357,
   "start_distance_m": 685.0,
   "end_distance_m": 705.0,
   "midpoint_distance_m": 695.0,
   "start_elevation_m": 188.07865893606981,
   "end_elevation_m": 192.82730391506269,
   "start_xy": [
    307051.2693088376,
    127571.60908598713
   ],
   "end_xy": [
    307038.3769707622,
    127586.58417458124
   ]
  },
  "max_25m": {
   "gradient_pct": 22.820297666509873,
   "start_distance_m": 681.0,
   "end_distance_m": 706.0,
   "midpoint_distance_m": 693.5,
   "start_elevation_m": 187.29761995628445,
   "end_elevation_m": 193.00269437291192,
   "start_xy": [
    307053.42147353594,
    127568.23741175745
   ],
   "end_xy": [
    307037.60675240215,
    127587.22195485514
   ]
  },
  "max_50m": {
   "gradient_pct": 19.559807207690596,
   "start_distance_m": 657.0,
   "end_distance_m": 707.0,
   "midpoint_distance_m": 682.0,
   "start_elevation_m": 183.3799387489516,
   "end_elevation_m": 193.1598423527969,
   "start_xy": [
    307066.33446172625,
    127548.00736637942
   ],
   "end_xy": [
    307036.836534042,
    127587.85973512904
   ]
  },
  "max_100m": {
   "gradient_pct": 16.9149532538801,
   "start_distance_m": 631.0,
   "end_distance_m": 731.0,
   "midpoint_distance_m": 681.0,
   "start_elevation_m": 179.7743298913207,
   "end_elevation_m": 196.6892831452008,
   "start_xy": [
    307081.6341340755,
    127527.10210025079
   ],
   "end_xy": [
    307015.93382011005,
    127586.4331013466
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -23.080098285085455,
   "start_distance_m": 190.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 192.5,
   "start_elevation_m": 149.77262385868468,
   "end_elevation_m": 148.6186189444304,
   "start_xy": [
    307433.21705582005,
    127678.7450446976
   ],
   "end_xy": [
    307428.5694469526,
    127676.90120852926
   ]
  },
  "min_10m": {
   "gradient_pct": -15.333380627209863,
   "start_distance_m": 191.0,
   "end_distance_m": 201.0,
   "midpoint_distance_m": 196.0,
   "start_elevation_m": 149.7437628580263,
   "end_elevation_m": 148.2104247953053,
   "start_xy": [
    307432.28753404657,
    127678.37627746393
   ],
   "end_xy": [
    307422.99231631175,
    127674.68860512726
   ]
  },
  "min_20m": {
   "gradient_pct": -7.102736837693584,
   "start_distance_m": 175.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 185.0,
   "start_elevation_m": 150.03916631196913,
   "end_elevation_m": 148.6186189444304,
   "start_xy": [
    307447.6058781877,
    127682.97386343838
   ],
   "end_xy": [
    307428.5694469526,
    127676.90120852926
   ]
  },
  "min_25m": {
   "gradient_pct": -6.84112615085246,
   "start_distance_m": 176.0,
   "end_distance_m": 201.0,
   "midpoint_distance_m": 188.5,
   "start_elevation_m": 149.92070633301842,
   "end_elevation_m": 148.2104247953053,
   "start_xy": [
    307446.64538626507,
    127682.6955555754
   ],
   "end_xy": [
    307422.99231631175,
    127674.68860512726
   ]
  },
  "min_50m": {
   "gradient_pct": -1.2780075370645818,
   "start_distance_m": 174.0,
   "end_distance_m": 224.0,
   "midpoint_distance_m": 199.0,
   "start_elevation_m": 149.98909235001096,
   "end_elevation_m": 149.35008858147867,
   "start_xy": [
    307448.56637011026,
    127683.25217130137
   ],
   "end_xy": [
    307401.6133155217,
    127666.20695875291
   ]
  },
  "min_100m": {
   "gradient_pct": 1.246213145757764,
   "start_distance_m": 175.0,
   "end_distance_m": 275.0,
   "midpoint_distance_m": 225.0,
   "start_elevation_m": 150.03916631196913,
   "end_elevation_m": 151.2853794577269,
   "start_xy": [
    307447.6058781877,
    127682.97386343838
   ],
   "end_xy": [
    307355.9215009239,
    127643.70762057563
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.59852896164267,
   "start_distance_m": 699.0,
   "end_distance_m": 701.0,
   "midpoint_distance_m": 700.0,
   "start_elevation_m": 190.7555672940299,
   "end_elevation_m": 191.68753787326276,
   "start_xy": [
    307042.99828092277,
    127582.75749293783
   ],
   "end_xy": [
    307041.4578442026,
    127584.03305348563
   ]
  },
  "max_3m": {
   "gradient_pct": 42.97607322081092,
   "start_distance_m": 699.0,
   "end_distance_m": 702.0,
   "midpoint_distance_m": 700.5,
   "start_elevation_m": 190.7555672940299,
   "end_elevation_m": 192.04484949065423,
   "start_xy": [
    307042.99828092277,
    127582.75749293783
   ],
   "end_xy": [
    307040.6876258425,
    127584.67083375953
   ]
  }
 },
 "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": {
  "placement_suppression": {
   "masked_fraction": 0.062,
   "windows_resited": [
    2.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.117,
   "obstruction_max_height_m": 22.4,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    100.0,
    150.0
   ],
   [
    170.0,
    200.0
   ]
  ],
  "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/england/bulk_dtm_1m/ST0525.tif"
  ],
  "calculated_at": "2026-09-05T06:20:59+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27-roads.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "summit-260905-summit-england-england-2026-08-27",
  "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": [
   "ST0525.tif"
  ],
  "route_summit_trim_m": 304.0,
  "route_summit_trim_loss_m": 45.2,
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Wiveliscombe",
  "county": "Somerset"
 }
}