{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (51.8267, -2.4582)",
 "slug": "discovered-lane-51-8267-2-4582",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 36.32309674841423,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 44.0,
   "end_distance_m": 46.0,
   "start_elevation_m": 78.71231376812085,
   "end_elevation_m": 79.43877570308914,
   "min_gradient_pct": -14.302281231127978
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.01472025650062,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 43.0,
   "end_distance_m": 46.0,
   "start_elevation_m": 78.44833409539412,
   "end_elevation_m": 79.43877570308914,
   "min_gradient_pct": -11.839432736541275
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.408707880405075,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 85.78835486838695,
   "end_elevation_m": 87.0587902624072,
   "min_gradient_pct": -7.878890536400434
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.190216389746126,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 105.0,
   "end_distance_m": 115.0,
   "start_elevation_m": 84.87558652716145,
   "end_elevation_m": 87.29460816613606,
   "min_gradient_pct": -2.865969471832699
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.4689868315987,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 100.0,
   "end_distance_m": 120.0,
   "start_elevation_m": 83.82567018450479,
   "end_elevation_m": 88.31946755082453,
   "min_gradient_pct": 1.886291000624638
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.663293794490187,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 98.0,
   "end_distance_m": 123.0,
   "start_elevation_m": 83.45377437553694,
   "end_elevation_m": 88.86959782415948,
   "min_gradient_pct": 2.0055649157426387
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.812650017238298,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 85.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 81.60513830644592,
   "end_elevation_m": 90.51146331506507,
   "min_gradient_pct": 3.0374902308298886
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.704016989646732,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 91.0,
   "end_distance_m": 191.0,
   "start_elevation_m": 82.33938591564187,
   "end_elevation_m": 98.0434029052886,
   "min_gradient_pct": 7.116711123836353
  }
 ],
 "shape": {
  "ascent_concentration": 0.411,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 126.0,
  "shape_class": "sustained"
 },
 "length_m": 384.87298338961665,
 "start_elevation_m": 76.70895906066843,
 "end_elevation_m": 112.54113720529374,
 "endpoint_gain_m": 35.8321781446253,
 "overall_gradient_pct": 9.310130794073297,
 "accumulated_ascent_m": 36.771703466492895,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.408707880405075,
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 111.5,
   "start_elevation_m": 85.78835486838695,
   "end_elevation_m": 87.0587902624072,
   "start_xy": [
    368501.1139333768,
    214324.4264282855
   ],
   "end_xy": [
    368505.69063772017,
    214326.43696279117
   ]
  },
  "max_10m": {
   "gradient_pct": 24.190216389746126,
   "start_distance_m": 105.0,
   "end_distance_m": 115.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 84.87558652716145,
   "end_elevation_m": 87.29460816613606,
   "start_xy": [
    368497.4582731558,
    214322.8028063009
   ],
   "end_xy": [
    368506.6459178796,
    214326.73266503497
   ]
  },
  "max_20m": {
   "gradient_pct": 22.4689868315987,
   "start_distance_m": 100.0,
   "end_distance_m": 120.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 83.82567018450479,
   "end_elevation_m": 88.31946755082453,
   "start_xy": [
    368493.58800256165,
    214319.78562590232
   ],
   "end_xy": [
    368511.4223186768,
    214328.2111762541
   ]
  },
  "max_25m": {
   "gradient_pct": 21.663293794490187,
   "start_distance_m": 98.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 110.5,
   "start_elevation_m": 83.45377437553694,
   "end_elevation_m": 88.86959782415948,
   "start_xy": [
    368492.21516450954,
    214318.33121341522
   ],
   "end_xy": [
    368514.28815915505,
    214329.09828298553
   ]
  },
  "max_50m": {
   "gradient_pct": 17.812650017238298,
   "start_distance_m": 85.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 81.60513830644592,
   "end_elevation_m": 90.51146331506507,
   "start_xy": [
    368491.03605105914,
    214306.58804209705
   ],
   "end_xy": [
    368525.72035313695,
    214332.74486999397
   ]
  },
  "max_100m": {
   "gradient_pct": 15.704016989646732,
   "start_distance_m": 91.0,
   "end_distance_m": 191.0,
   "midpoint_distance_m": 141.0,
   "start_elevation_m": 82.33938591564187,
   "end_elevation_m": 98.0434029052886,
   "start_xy": [
    368489.91307325184,
    214312.44502649718
   ],
   "end_xy": [
    368540.16132725734,
    214381.12780172704
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.878890536400434,
   "start_distance_m": 29.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 31.5,
   "start_elevation_m": 78.69283264723606,
   "end_elevation_m": 78.29888812041604,
   "start_xy": [
    368512.4260817111,
    214254.99236721548
   ],
   "end_xy": [
    368510.1103388532,
    214259.4237704939
   ]
  },
  "min_10m": {
   "gradient_pct": -2.865969471832699,
   "start_distance_m": 29.0,
   "end_distance_m": 39.0,
   "midpoint_distance_m": 34.0,
   "start_elevation_m": 78.69283264723606,
   "end_elevation_m": 78.40623570005279,
   "start_xy": [
    368512.4260817111,
    214254.99236721548
   ],
   "end_xy": [
    368507.7945959953,
    214263.85517377232
   ]
  },
  "min_20m": {
   "gradient_pct": 1.886291000624638,
   "start_distance_m": 23.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 33.0,
   "start_elevation_m": 78.07107589526919,
   "end_elevation_m": 78.44833409539412,
   "start_xy": [
    368515.20497314056,
    214249.67468328137
   ],
   "end_xy": [
    368505.94200170896,
    214267.40029639506
   ]
  },
  "min_25m": {
   "gradient_pct": 2.0055649157426387,
   "start_distance_m": 216.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 228.5,
   "start_elevation_m": 100.11138089853011,
   "end_elevation_m": 100.61277212746577,
   "start_xy": [
    368553.3190638019,
    214400.1014616145
   ],
   "end_xy": [
    368575.0441181713,
    214412.446904217
   ]
  },
  "min_50m": {
   "gradient_pct": 3.0374902308298886,
   "start_distance_m": 204.0,
   "end_distance_m": 254.0,
   "midpoint_distance_m": 229.0,
   "start_elevation_m": 99.42953338755184,
   "end_elevation_m": 100.94827850296679,
   "start_xy": [
    368543.67118515505,
    214393.35595974218
   ],
   "end_xy": [
    368585.15379267343,
    214419.94938212403
   ]
  },
  "min_100m": {
   "gradient_pct": 7.116711123836353,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 76.70895906066843,
   "end_elevation_m": 83.82567018450479,
   "start_xy": [
    368532.261,
    214237.726
   ],
   "end_xy": [
    368493.58800256165,
    214319.78562590232
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 36.32309674841423,
   "start_distance_m": 44.0,
   "end_distance_m": 46.0,
   "midpoint_distance_m": 45.0,
   "start_elevation_m": 78.71231376812085,
   "end_elevation_m": 79.43877570308914,
   "start_xy": [
    368505.47885313735,
    214268.28657705075
   ],
   "end_xy": [
    368504.8259320669,
    214270.1766170698
   ]
  },
  "max_3m": {
   "gradient_pct": 33.01472025650062,
   "start_distance_m": 43.0,
   "end_distance_m": 46.0,
   "midpoint_distance_m": 44.5,
   "start_elevation_m": 78.44833409539412,
   "end_elevation_m": 79.43877570308914,
   "start_xy": [
    368505.94200170896,
    214267.40029639506
   ],
   "end_xy": [
    368504.8259320669,
    214270.1766170698
   ]
  }
 },
 "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": {
  "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/SO6510.tif"
  ],
  "calculated_at": "2026-09-01T05:21:10+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "run_id": "chunk-04-260901",
  "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": [
   "SO6510.tif"
  ],
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 28] No space left on device",
  "trimmed_from": "discovered-lane-51-8267-2-4582",
  "trim_cut_m": [
   [
    384.9,
    437.7
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Pope's Hill",
  "county": "Gloucestershire"
 }
}