{
 "ocl_version": "0.1.0",
 "name": "Stoney Lane",
 "slug": "stoney-lane-3",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.27045603552392,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 18.0,
   "end_distance_m": 20.0,
   "start_elevation_m": 154.25354582260837,
   "end_elevation_m": 154.91895494331885,
   "min_gradient_pct": -31.552903522145925
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.359680168665705,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 18.0,
   "end_distance_m": 21.0,
   "start_elevation_m": 154.25354582260837,
   "end_elevation_m": 155.19433622766834,
   "min_gradient_pct": -22.36319514523757
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.093427336390505,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 16.0,
   "end_distance_m": 21.0,
   "start_elevation_m": 153.98966486084882,
   "end_elevation_m": 155.19433622766834,
   "min_gradient_pct": -14.606005684368029
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.173307093479252,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1629.0,
   "end_distance_m": 1639.0,
   "start_elevation_m": 242.1883411304037,
   "end_elevation_m": 244.30567183975162,
   "min_gradient_pct": -9.918475577246397
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.71566184580135,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1619.0,
   "end_distance_m": 1639.0,
   "start_elevation_m": 240.16253947059135,
   "end_elevation_m": 244.30567183975162,
   "min_gradient_pct": -3.5347581319022936
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.56868677719308,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1619.0,
   "end_distance_m": 1644.0,
   "start_elevation_m": 240.16253947059135,
   "end_elevation_m": 245.30471116488962,
   "min_gradient_pct": -2.9247316164430686
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.663642654609305,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1599.0,
   "end_distance_m": 1649.0,
   "start_elevation_m": 236.37691763964386,
   "end_elevation_m": 246.20873896694852,
   "min_gradient_pct": -2.16908628347727
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.11408572107578,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1580.0,
   "end_distance_m": 1680.0,
   "start_elevation_m": 233.71486994132164,
   "end_elevation_m": 250.82895566239742,
   "min_gradient_pct": -1.7196631450945574
  }
 ],
 "shape": {
  "ascent_concentration": 0.37,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 158.0,
  "shape_class": "sustained"
 },
 "length_m": 2299.3203592451464,
 "start_elevation_m": 153.58585937353413,
 "end_elevation_m": 281.49116661620894,
 "endpoint_gain_m": 127.90530724267481,
 "overall_gradient_pct": 5.562744083415387,
 "accumulated_ascent_m": 134.4634153303955,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.093427336390505,
   "start_distance_m": 16.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 18.5,
   "start_elevation_m": 153.98966486084882,
   "end_elevation_m": 155.19433622766834,
   "start_xy": [
    437306.7110252174,
    364274.8831217177
   ],
   "end_xy": [
    437308.52232838643,
    364279.3496370574
   ]
  },
  "max_10m": {
   "gradient_pct": 21.173307093479252,
   "start_distance_m": 1629.0,
   "end_distance_m": 1639.0,
   "midpoint_distance_m": 1634.0,
   "start_elevation_m": 242.1883411304037,
   "end_elevation_m": 244.30567183975162,
   "start_xy": [
    436332.34209758526,
    363384.52898286324
   ],
   "end_xy": [
    436324.7130974983,
    363390.82575412357
   ]
  },
  "max_20m": {
   "gradient_pct": 20.71566184580135,
   "start_distance_m": 1619.0,
   "end_distance_m": 1639.0,
   "midpoint_distance_m": 1629.0,
   "start_elevation_m": 240.16253947059135,
   "end_elevation_m": 244.30567183975162,
   "start_xy": [
    436340.59747126483,
    363378.88550827646
   ],
   "end_xy": [
    436324.7130974983,
    363390.82575412357
   ]
  },
  "max_25m": {
   "gradient_pct": 20.56868677719308,
   "start_distance_m": 1619.0,
   "end_distance_m": 1644.0,
   "midpoint_distance_m": 1631.5,
   "start_elevation_m": 240.16253947059135,
   "end_elevation_m": 245.30471116488962,
   "start_xy": [
    436340.59747126483,
    363378.88550827646
   ],
   "end_xy": [
    436321.72024854814,
    363394.8311074365
   ]
  },
  "max_50m": {
   "gradient_pct": 19.663642654609305,
   "start_distance_m": 1599.0,
   "end_distance_m": 1649.0,
   "midpoint_distance_m": 1624.0,
   "start_elevation_m": 236.37691763964386,
   "end_elevation_m": 246.20873896694852,
   "start_xy": [
    436357.712128049,
    363368.69345658686
   ],
   "end_xy": [
    436318.727399598,
    363398.8364607495
   ]
  },
  "max_100m": {
   "gradient_pct": 17.11408572107578,
   "start_distance_m": 1580.0,
   "end_distance_m": 1680.0,
   "midpoint_distance_m": 1630.0,
   "start_elevation_m": 233.71486994132164,
   "end_elevation_m": 250.82895566239742,
   "start_xy": [
    436375.14915293915,
    363361.14692341065
   ],
   "end_xy": [
    436299.89660538494,
    363423.45918318024
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -14.606005684368029,
   "start_distance_m": 39.0,
   "end_distance_m": 44.0,
   "midpoint_distance_m": 41.5,
   "start_elevation_m": 157.3239255061941,
   "end_elevation_m": 156.59362522197569,
   "start_xy": [
    437323.1497220857,
    364289.75767458166
   ],
   "end_xy": [
    437327.7952763875,
    364291.60668113356
   ]
  },
  "min_10m": {
   "gradient_pct": -9.918475577246397,
   "start_distance_m": 39.0,
   "end_distance_m": 49.0,
   "midpoint_distance_m": 44.0,
   "start_elevation_m": 157.3239255061941,
   "end_elevation_m": 156.33207794846945,
   "start_xy": [
    437323.1497220857,
    364289.75767458166
   ],
   "end_xy": [
    437332.4408306893,
    364293.4556876855
   ]
  },
  "min_20m": {
   "gradient_pct": -3.5347581319022936,
   "start_distance_m": 38.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 48.0,
   "start_elevation_m": 157.2994318110702,
   "end_elevation_m": 156.59248018468975,
   "start_xy": [
    437322.22061122535,
    364289.38787327125
   ],
   "end_xy": [
    437338.54952529795,
    364300.03905076097
   ]
  },
  "min_25m": {
   "gradient_pct": -2.9247316164430686,
   "start_distance_m": 233.0,
   "end_distance_m": 258.0,
   "midpoint_distance_m": 245.5,
   "start_elevation_m": 157.90450435865222,
   "end_elevation_m": 157.17332145454145,
   "start_xy": [
    437204.9802454073,
    364295.0233670438
   ],
   "end_xy": [
    437180.38312952337,
    364292.8572741485
   ]
  },
  "min_50m": {
   "gradient_pct": -2.16908628347727,
   "start_distance_m": 211.0,
   "end_distance_m": 261.0,
   "midpoint_distance_m": 236.0,
   "start_elevation_m": 158.1944983438536,
   "end_elevation_m": 157.10995520211497,
   "start_xy": [
    437226.9641118082,
    364294.180978732
   ],
   "end_xy": [
    437177.63596405264,
    364291.6518356904
   ]
  },
  "min_100m": {
   "gradient_pct": -1.7196631450945574,
   "start_distance_m": 164.0,
   "end_distance_m": 264.0,
   "midpoint_distance_m": 214.0,
   "start_elevation_m": 158.80802019892738,
   "end_elevation_m": 157.08835705383282,
   "start_xy": [
    437273.9085790202,
    364293.1890343148
   ],
   "end_xy": [
    437174.88879858184,
    364290.44639723236
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.27045603552392,
   "start_distance_m": 18.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 19.0,
   "start_elevation_m": 154.25354582260837,
   "end_elevation_m": 154.91895494331885,
   "start_xy": [
    437307.21387369616,
    364276.81887568126
   ],
   "end_xy": [
    437307.72049231816,
    364278.752092984
   ]
  },
  "max_3m": {
   "gradient_pct": 31.359680168665705,
   "start_distance_m": 18.0,
   "end_distance_m": 21.0,
   "midpoint_distance_m": 19.5,
   "start_elevation_m": 154.25354582260837,
   "end_elevation_m": 155.19433622766834,
   "start_xy": [
    437307.21387369616,
    364276.81887568126
   ],
   "end_xy": [
    437308.52232838643,
    364279.3496370574
   ]
  }
 },
 "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": 0.015,
   "obstruction_max_height_m": 10.47,
   "flagged_windows_m": []
  },
  "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/SK3560.tif"
  ],
  "calculated_at": "2026-09-05T01:57:55+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/mnt/HC_Volume_106794610/hunt-gb/regions/region-01.osm.pbf",
  "osm_snapshot": "",
  "run_id": "hunt-england-260905",
  "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": [
   "SK3560.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Alton",
  "county": "Derbyshire"
 }
}