{
 "ocl_version": "0.1.0",
 "name": "COL/216/10",
 "slug": "col-216-10",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.921139430558696,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 206.390034121727,
   "end_elevation_m": 206.9884569103382,
   "min_gradient_pct": 1.8151603200408317
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.83903767676558,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 206.15328578003522,
   "end_elevation_m": 206.9884569103382,
   "min_gradient_pct": 2.5978414443822353
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.618193278619742,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 70.0,
   "end_distance_m": 75.0,
   "start_elevation_m": 205.9499321596299,
   "end_elevation_m": 207.18084182356088,
   "min_gradient_pct": 2.8305585281094636
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.747105619070567,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 206.15328578003522,
   "end_elevation_m": 208.42799634194228,
   "min_gradient_pct": 4.236673366430068
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.336746653362155,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 61.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 204.16064701126984,
   "end_elevation_m": 208.42799634194228,
   "min_gradient_pct": 8.696508263672342
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.179549046154875,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 61.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 204.16064701126984,
   "end_elevation_m": 209.45553427280856,
   "min_gradient_pct": 8.659232069652262
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.6553330884027,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 55.0,
   "end_distance_m": 105.0,
   "start_elevation_m": 203.01028527651903,
   "end_elevation_m": 212.83795182072038,
   "min_gradient_pct": 9.668427176822604
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.07833184262705,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 226.0,
   "start_elevation_m": 215.4953170365634,
   "end_elevation_m": 232.57364887919044,
   "min_gradient_pct": 14.468712401902708
  }
 ],
 "shape": {
  "ascent_concentration": 0.319,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 117.0,
  "shape_class": "sustained"
 },
 "length_m": 241.1913394396496,
 "start_elevation_m": 197.4217529296875,
 "end_elevation_m": 233.50519955963168,
 "endpoint_gain_m": 36.08344662994418,
 "overall_gradient_pct": 14.96050675524894,
 "accumulated_ascent_m": 36.09365352149695,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.618193278619742,
   "start_distance_m": 70.0,
   "end_distance_m": 75.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 205.9499321596299,
   "end_elevation_m": 207.18084182356088,
   "start_xy": [
    405071.06020272576,
    411382.0997624789
   ],
   "end_xy": [
    405072.4594826211,
    411377.299552507
   ]
  },
  "max_10m": {
   "gradient_pct": 22.747105619070567,
   "start_distance_m": 71.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 206.15328578003522,
   "end_elevation_m": 208.42799634194228,
   "start_xy": [
    405071.34005870484,
    411381.13972048456
   ],
   "end_xy": [
    405074.13861849555,
    411371.5393005407
   ]
  },
  "max_20m": {
   "gradient_pct": 21.336746653362155,
   "start_distance_m": 61.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 71.0,
   "start_elevation_m": 204.16064701126984,
   "end_elevation_m": 208.42799634194228,
   "start_xy": [
    405068.5414989141,
    411390.74014042836
   ],
   "end_xy": [
    405074.13861849555,
    411371.5393005407
   ]
  },
  "max_25m": {
   "gradient_pct": 21.179549046154875,
   "start_distance_m": 61.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 73.5,
   "start_elevation_m": 204.16064701126984,
   "end_elevation_m": 209.45553427280856,
   "start_xy": [
    405068.5414989141,
    411390.74014042836
   ],
   "end_xy": [
    405075.5378983909,
    411366.7390905688
   ]
  },
  "max_50m": {
   "gradient_pct": 19.6553330884027,
   "start_distance_m": 55.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 80.0,
   "start_elevation_m": 203.01028527651903,
   "end_elevation_m": 212.83795182072038,
   "start_xy": [
    405066.86236303975,
    411396.50039239466
   ],
   "end_xy": [
    405080.8551619932,
    411348.4982926755
   ]
  },
  "max_100m": {
   "gradient_pct": 17.07833184262705,
   "start_distance_m": 126.0,
   "end_distance_m": 226.0,
   "midpoint_distance_m": 176.0,
   "start_elevation_m": 215.4953170365634,
   "end_elevation_m": 232.57364887919044,
   "start_xy": [
    405087.4589881403,
    411328.7490362469
   ],
   "end_xy": [
    405175.258062552,
    411282.5831114111
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.8305585281094636,
   "start_distance_m": 234.0,
   "end_distance_m": 239.0,
   "midpoint_distance_m": 236.5,
   "start_elevation_m": 233.2828572248601,
   "end_elevation_m": 233.42438515126557,
   "start_xy": [
    405183.2267805222,
    411281.8763342812
   ],
   "end_xy": [
    405188.20722925354,
    411281.43459857494
   ]
  },
  "min_10m": {
   "gradient_pct": 4.236673366430068,
   "start_distance_m": 231.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 236.0,
   "start_elevation_m": 233.0748829337369,
   "end_elevation_m": 233.4985502703799,
   "start_xy": [
    405180.23851128336,
    411282.1413757049
   ],
   "end_xy": [
    405190.19940874615,
    411281.2579042925
   ]
  },
  "min_20m": {
   "gradient_pct": 8.696508263672342,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 197.4217529296875,
   "end_elevation_m": 199.16105458242197,
   "start_xy": [
    405078.0,
    411449.0
   ],
   "end_xy": [
    405071.88482295483,
    411429.95782024803
   ]
  },
  "min_25m": {
   "gradient_pct": 8.659232069652262,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 197.4217529296875,
   "end_elevation_m": 199.58656094710057,
   "start_xy": [
    405078.0,
    411449.0
   ],
   "end_xy": [
    405070.3560286935,
    411425.19727531006
   ]
  },
  "min_50m": {
   "gradient_pct": 9.668427176822604,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 197.4217529296875,
   "end_elevation_m": 202.2559665180988,
   "start_xy": [
    405078.0,
    411449.0
   ],
   "end_xy": [
    405065.4630831444,
    411401.30060236657
   ]
  },
  "min_100m": {
   "gradient_pct": 14.468712401902708,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 197.4217529296875,
   "end_elevation_m": 211.8904653315902,
   "start_xy": [
    405078.0,
    411449.0
   ],
   "end_xy": [
    405079.4558820978,
    411353.29850264743
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.921139430558696,
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 73.0,
   "start_elevation_m": 206.390034121727,
   "end_elevation_m": 206.9884569103382,
   "start_xy": [
    405071.6199146839,
    411380.17967849015
   ],
   "end_xy": [
    405072.179626642,
    411378.2595945014
   ]
  },
  "max_3m": {
   "gradient_pct": 27.83903767676558,
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 206.15328578003522,
   "end_elevation_m": 206.9884569103382,
   "start_xy": [
    405071.34005870484,
    411381.13972048456
   ],
   "end_xy": [
    405072.179626642,
    411378.2595945014
   ]
  }
 },
 "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": 0.086,
   "obstruction_max_height_m": 8.84,
   "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/SE0510.tif"
  ],
  "calculated_at": "2026-08-28T01:49:07+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27.osm.pbf",
  "osm_snapshot": "2026-08-26T20:22:15Z",
  "run_id": "chains-england-260827",
  "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": [
   "SE0510.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Marsden",
  "county": ""
 }
}