{
 "ocl_version": "0.1.0",
 "name": "Girt Lane",
 "slug": "girt-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.693647873872806,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 276.0,
   "end_distance_m": 278.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 208.7305006017929,
   "min_gradient_pct": -11.604217473517053
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.850384859886805,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 276.0,
   "end_distance_m": 279.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 208.97213919011205,
   "min_gradient_pct": -8.048010006923315
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.2202995917645,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 276.0,
   "end_distance_m": 281.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 209.45764262390367,
   "min_gradient_pct": -5.086274133677193
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.743020068758938,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 276.0,
   "end_distance_m": 286.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 210.57092965119134,
   "min_gradient_pct": -1.575149536600975
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.275375189735342,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 264.0,
   "end_distance_m": 284.0,
   "start_elevation_m": 205.69537892350164,
   "end_elevation_m": 210.1504539614487,
   "min_gradient_pct": -0.4567943027453225
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.109358146774184,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 262.0,
   "end_distance_m": 287.0,
   "start_elevation_m": 205.2755269624026,
   "end_elevation_m": 210.80286649909615,
   "min_gradient_pct": 0.37300593861539255
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.849833363678158,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 242.0,
   "end_distance_m": 292.0,
   "start_elevation_m": 200.90123438724154,
   "end_elevation_m": 211.82615106908062,
   "min_gradient_pct": 0.8351554111577002
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.58274860105834,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 238.0,
   "end_distance_m": 338.0,
   "start_elevation_m": 200.14709156959654,
   "end_elevation_m": 220.72984017065488,
   "min_gradient_pct": 1.4681882374747772
  }
 ],
 "shape": {
  "ascent_concentration": 0.472,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 188.0,
  "shape_class": "stepped"
 },
 "length_m": 512.9999999999966,
 "start_elevation_m": 184.18224953979487,
 "end_elevation_m": 236.29893686374044,
 "endpoint_gain_m": 52.11668732394557,
 "overall_gradient_pct": 10.159198308761388,
 "accumulated_ascent_m": 53.686066395518566,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.2202995917645,
   "start_distance_m": 276.0,
   "end_distance_m": 281.0,
   "midpoint_distance_m": 278.5,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 209.45764262390367,
   "start_xy": [
    259847.92731796627,
    147225.36830306862
   ],
   "end_xy": [
    259851.8926685672,
    147222.3226513138
   ]
  },
  "max_10m": {
   "gradient_pct": 23.743020068758938,
   "start_distance_m": 276.0,
   "end_distance_m": 286.0,
   "midpoint_distance_m": 281.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 210.57092965119134,
   "start_xy": [
    259847.92731796627,
    147225.36830306862
   ],
   "end_xy": [
    259855.8580191681,
    147219.27699955896
   ]
  },
  "max_20m": {
   "gradient_pct": 22.275375189735342,
   "start_distance_m": 264.0,
   "end_distance_m": 284.0,
   "midpoint_distance_m": 274.0,
   "start_elevation_m": 205.69537892350164,
   "end_elevation_m": 210.1504539614487,
   "start_xy": [
    259840.7204921405,
    147234.57171879613
   ],
   "end_xy": [
    259854.27187892774,
    147220.49526026088
   ]
  },
  "max_25m": {
   "gradient_pct": 22.109358146774184,
   "start_distance_m": 262.0,
   "end_distance_m": 287.0,
   "midpoint_distance_m": 274.5,
   "start_elevation_m": 205.2755269624026,
   "end_elevation_m": 210.80286649909615,
   "start_xy": [
    259839.83687174154,
    147236.36593589297
   ],
   "end_xy": [
    259856.6510892883,
    147218.66786920797
   ]
  },
  "max_50m": {
   "gradient_pct": 21.849833363678158,
   "start_distance_m": 242.0,
   "end_distance_m": 292.0,
   "midpoint_distance_m": 267.0,
   "start_elevation_m": 200.90123438724154,
   "end_elevation_m": 211.82615106908062,
   "start_xy": [
    259834.7206826937,
    147255.33283164632
   ],
   "end_xy": [
    259860.40922338524,
    147215.42957801805
   ]
  },
  "max_100m": {
   "gradient_pct": 20.58274860105834,
   "start_distance_m": 238.0,
   "end_distance_m": 338.0,
   "midpoint_distance_m": 288.0,
   "start_elevation_m": 200.14709156959654,
   "end_elevation_m": 220.72984017065488,
   "start_xy": [
    259832.89810454776,
    147258.89347890514
   ],
   "end_xy": [
    259888.1646678429,
    147178.8440199302
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.086274133677193,
   "start_distance_m": 54.0,
   "end_distance_m": 59.0,
   "midpoint_distance_m": 56.5,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 188.27024155926745,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259720.14579669363,
    147395.8322214849
   ]
  },
  "min_10m": {
   "gradient_pct": -1.575149536600975,
   "start_distance_m": 54.0,
   "end_distance_m": 64.0,
   "midpoint_distance_m": 59.0,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 188.3670403122912,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259722.88525725206,
    147391.64947647127
   ]
  },
  "min_20m": {
   "gradient_pct": -0.4567943027453225,
   "start_distance_m": 54.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 64.0,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 188.43319640540224,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259728.5435160009,
    147383.42598506267
   ]
  },
  "min_25m": {
   "gradient_pct": 0.37300593861539255,
   "start_distance_m": 54.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 66.5,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 188.61780675060515,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259731.9866482732,
    147379.80040370853
   ]
  },
  "min_50m": {
   "gradient_pct": 0.8351554111577002,
   "start_distance_m": 54.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 79.0,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 188.94213297153016,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259746.53367923904,
    147359.58750922448
   ]
  },
  "min_100m": {
   "gradient_pct": 1.4681882374747772,
   "start_distance_m": 54.0,
   "end_distance_m": 154.0,
   "midpoint_distance_m": 104.0,
   "start_elevation_m": 188.5245552659513,
   "end_elevation_m": 189.99274350342608,
   "start_xy": [
    259717.4063361352,
    147400.01496649848
   ],
   "end_xy": [
    259773.21905828125,
    147317.40293258455
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.693647873872806,
   "start_distance_m": 276.0,
   "end_distance_m": 278.0,
   "midpoint_distance_m": 277.0,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 208.7305006017929,
   "start_xy": [
    259847.92731796627,
    147225.36830306862
   ],
   "end_xy": [
    259849.51345820664,
    147224.1500423667
   ]
  },
  "max_3m": {
   "gradient_pct": 25.850384859886805,
   "start_distance_m": 276.0,
   "end_distance_m": 279.0,
   "midpoint_distance_m": 277.5,
   "start_elevation_m": 208.19662764431544,
   "end_elevation_m": 208.97213919011205,
   "start_xy": [
    259847.92731796627,
    147225.36830306862
   ],
   "end_xy": [
    259850.30652832682,
    147223.5409120157
   ]
  }
 },
 "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": 0.006,
   "obstruction_max_height_m": 3.16,
   "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/SS5545.tif"
  ],
  "calculated_at": "2026-09-05T06:57:07+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-27-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": [
   "SS5545.tif"
  ],
  "route_summit_trim_m": 127.8,
  "route_summit_trim_loss_m": 5.9,
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "The Rawn's",
  "county": "Devon"
 }
}