{
 "ocl_version": "0.1.0",
 "name": "Shatton Lane",
 "slug": "shatton-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.532684169787785,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 171.0,
   "end_distance_m": 173.0,
   "start_elevation_m": 170.14339992096586,
   "end_elevation_m": 170.81405360436162,
   "min_gradient_pct": -5.433741391811964
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.974142584125236,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 180.0,
   "end_distance_m": 183.0,
   "start_elevation_m": 171.5007220494843,
   "end_elevation_m": 172.39994632700805,
   "min_gradient_pct": -2.296891903419388
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.452764643191585,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1005.0,
   "end_distance_m": 1010.0,
   "start_elevation_m": 292.69302575082145,
   "end_elevation_m": 293.965663982981,
   "min_gradient_pct": -0.4251938019768886
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.654568227257755,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 999.0,
   "end_distance_m": 1009.0,
   "start_elevation_m": 291.3676409672121,
   "end_elevation_m": 293.73309778993786,
   "min_gradient_pct": 1.127324412770463
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.42116172047389,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 989.0,
   "end_distance_m": 1009.0,
   "start_elevation_m": 289.2488654458431,
   "end_elevation_m": 293.73309778993786,
   "min_gradient_pct": 3.7127209306115105
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.058049237264413,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 562.0,
   "end_distance_m": 587.0,
   "start_elevation_m": 222.00158622202122,
   "end_elevation_m": 227.51609853133732,
   "min_gradient_pct": 3.910222321406536
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.940354651789562,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 960.0,
   "end_distance_m": 1010.0,
   "start_elevation_m": 283.49548665708625,
   "end_elevation_m": 293.965663982981,
   "min_gradient_pct": 5.3758467974152495
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.773459720289992,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 558.0,
   "end_distance_m": 658.0,
   "start_elevation_m": 221.26322067447813,
   "end_elevation_m": 241.03668039476813,
   "min_gradient_pct": 6.5967363736379525
  }
 ],
 "shape": {
  "ascent_concentration": 0.316,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 342.0,
  "shape_class": "sustained"
 },
 "length_m": 1108.0429874426097,
 "start_elevation_m": 159.00501690381054,
 "end_elevation_m": 308.13307597656376,
 "endpoint_gain_m": 149.12805907275322,
 "overall_gradient_pct": 13.458688946441006,
 "accumulated_ascent_m": 149.491895213669,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.452764643191585,
   "start_distance_m": 1005.0,
   "end_distance_m": 1010.0,
   "midpoint_distance_m": 1007.5,
   "start_elevation_m": 292.69302575082145,
   "end_elevation_m": 293.965663982981,
   "start_xy": [
    420085.4089581074,
    381554.36872178863
   ],
   "end_xy": [
    420088.2185855353,
    381550.23278284626
   ]
  },
  "max_10m": {
   "gradient_pct": 23.654568227257755,
   "start_distance_m": 999.0,
   "end_distance_m": 1009.0,
   "midpoint_distance_m": 1004.0,
   "start_elevation_m": 291.3676409672121,
   "end_elevation_m": 293.73309778993786,
   "start_xy": [
    420081.8065652048,
    381559.16663521825
   ],
   "end_xy": [
    420087.65674833057,
    381551.0600304815
   ]
  },
  "max_20m": {
   "gradient_pct": 22.42116172047389,
   "start_distance_m": 989.0,
   "end_distance_m": 1009.0,
   "midpoint_distance_m": 999.0,
   "start_elevation_m": 289.2488654458431,
   "end_elevation_m": 293.73309778993786,
   "start_xy": [
    420075.78444271395,
    381567.149994542
   ],
   "end_xy": [
    420087.65674833057,
    381551.0600304815
   ]
  },
  "max_25m": {
   "gradient_pct": 22.058049237264413,
   "start_distance_m": 562.0,
   "end_distance_m": 587.0,
   "midpoint_distance_m": 574.5,
   "start_elevation_m": 222.00158622202122,
   "end_elevation_m": 227.51609853133732,
   "start_xy": [
    419822.759848862,
    381846.9238816805
   ],
   "end_xy": [
    419819.77764558914,
    381822.10239225015
   ]
  },
  "max_50m": {
   "gradient_pct": 20.940354651789562,
   "start_distance_m": 960.0,
   "end_distance_m": 1010.0,
   "midpoint_distance_m": 985.0,
   "start_elevation_m": 283.49548665708625,
   "end_elevation_m": 293.965663982981,
   "start_xy": [
    420059.4701147716,
    381590.99577912106
   ],
   "end_xy": [
    420088.2185855353,
    381550.23278284626
   ]
  },
  "max_100m": {
   "gradient_pct": 19.773459720289992,
   "start_distance_m": 558.0,
   "end_distance_m": 658.0,
   "midpoint_distance_m": 608.0,
   "start_elevation_m": 221.26322067447813,
   "end_elevation_m": 241.03668039476813,
   "start_xy": [
    419823.2376277459,
    381850.8952445973
   ],
   "end_xy": [
    419831.52808257943,
    381761.6514231958
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.4251938019768886,
   "start_distance_m": 38.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 40.5,
   "start_elevation_m": 161.47838343044245,
   "end_elevation_m": 161.4571237403436,
   "start_xy": [
    419915.5063597393,
    382352.08620264503
   ],
   "end_xy": [
    419910.621526985,
    382351.019242833
   ]
  },
  "min_10m": {
   "gradient_pct": 1.127324412770463,
   "start_distance_m": 36.0,
   "end_distance_m": 46.0,
   "midpoint_distance_m": 41.0,
   "start_elevation_m": 161.3618611525088,
   "end_elevation_m": 161.47459359378584,
   "start_xy": [
    419917.4604586237,
    382352.5122279292
   ],
   "end_xy": [
    419907.9593052793,
    382349.8998359513
   ]
  },
  "min_20m": {
   "gradient_pct": 3.7127209306115105,
   "start_distance_m": 134.0,
   "end_distance_m": 154.0,
   "midpoint_distance_m": 144.0,
   "start_elevation_m": 168.36311005516694,
   "end_elevation_m": 169.10565424128924,
   "start_xy": [
    419881.346980182,
    382269.00911966723
   ],
   "end_xy": [
    419882.63871896395,
    382249.0508805397
   ]
  },
  "min_25m": {
   "gradient_pct": 3.910222321406536,
   "start_distance_m": 132.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 144.5,
   "start_elevation_m": 168.2443788445047,
   "end_elevation_m": 169.22193442485633,
   "start_xy": [
    419881.28952500335,
    382271.0066376836
   ],
   "end_xy": [
    419882.3755415649,
    382246.0762878897
   ]
  },
  "min_50m": {
   "gradient_pct": 5.3758467974152495,
   "start_distance_m": 110.0,
   "end_distance_m": 160.0,
   "midpoint_distance_m": 135.0,
   "start_elevation_m": 166.77863369016865,
   "end_elevation_m": 169.46655708887627,
   "start_xy": [
    419882.1838190198,
    382292.98549670464
   ],
   "end_xy": [
    419881.9315471148,
    382243.1093249765
   ]
  },
  "min_100m": {
   "gradient_pct": 6.5967363736379525,
   "start_distance_m": 71.0,
   "end_distance_m": 171.0,
   "midpoint_distance_m": 121.0,
   "start_elevation_m": 163.5466635473279,
   "end_elevation_m": 170.14339992096586,
   "start_xy": [
    419898.1686521144,
    382326.8968957878
   ],
   "end_xy": [
    419880.3035674644,
    382232.2304609614
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.532684169787785,
   "start_distance_m": 171.0,
   "end_distance_m": 173.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 170.14339992096586,
   "end_elevation_m": 170.81405360436162,
   "start_xy": [
    419880.3035674644,
    382232.2304609614
   ],
   "end_xy": [
    419880.00757116434,
    382230.252485686
   ]
  },
  "max_3m": {
   "gradient_pct": 29.974142584125236,
   "start_distance_m": 180.0,
   "end_distance_m": 183.0,
   "midpoint_distance_m": 181.5,
   "start_elevation_m": 171.5007220494843,
   "end_elevation_m": 172.39994632700805,
   "start_xy": [
    419877.83886634535,
    382223.6133480019
   ],
   "end_xy": [
    419876.8098643592,
    382220.7953425588
   ]
  }
 },
 "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": 0.014,
   "obstruction_max_height_m": 8.01,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "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/SK1580.tif",
   "data/cache/england/bulk_dtm_1m/SK2080.tif"
  ],
  "calculated_at": "2026-08-19T18:46:40+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": [
   "SK1580.tif",
   "SK2080.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.3% over 200 m (Terrain 50), gain 146.1 m over 1063 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Shatton",
  "county": "Derbyshire"
 }
}