{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (52.5667, -2.9026)",
 "slug": "discovered-lane-52-5667-2-9026",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.653368191660775,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 564.0,
   "end_distance_m": 566.0,
   "start_elevation_m": 298.11823049240274,
   "end_elevation_m": 298.63129785623596,
   "min_gradient_pct": -25.149891307947314
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 25.068655916908256,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 563.0,
   "end_distance_m": 566.0,
   "start_elevation_m": 297.8792381787287,
   "end_elevation_m": 298.63129785623596,
   "min_gradient_pct": -22.133114604404607
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.477680266790003,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 562.0,
   "end_distance_m": 567.0,
   "start_elevation_m": 297.6328174657417,
   "end_elevation_m": 298.8567014790812,
   "min_gradient_pct": -18.354475685558782
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.354661964293655,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 560.0,
   "end_distance_m": 570.0,
   "start_elevation_m": 297.175326712877,
   "end_elevation_m": 299.51079290930636,
   "min_gradient_pct": -16.537367036252704
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.21593084613886,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 549.0,
   "end_distance_m": 569.0,
   "start_elevation_m": 294.8839938962072,
   "end_elevation_m": 299.32718006543496,
   "min_gradient_pct": -10.029347659006191
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.83299999824999,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 549.0,
   "end_distance_m": 574.0,
   "start_elevation_m": 294.8839938962072,
   "end_elevation_m": 300.3422438957697,
   "min_gradient_pct": -7.735008405481494
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.443159447794983,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 538.0,
   "end_distance_m": 588.0,
   "start_elevation_m": 292.74426581661413,
   "end_elevation_m": 302.9658455405116,
   "min_gradient_pct": -5.049979454576487
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.906827209999506,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 507.0,
   "end_distance_m": 607.0,
   "start_elevation_m": 287.3783726558792,
   "end_elevation_m": 306.2851998658787,
   "min_gradient_pct": -4.52718280307829
  }
 ],
 "shape": {
  "ascent_concentration": 0.433,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 200.0,
  "shape_class": "sustained"
 },
 "length_m": 2758.053168984572,
 "start_elevation_m": 259.86655398849535,
 "end_elevation_m": 422.69377949279874,
 "endpoint_gain_m": 162.82722550430339,
 "overall_gradient_pct": 5.903701470854937,
 "accumulated_ascent_m": 178.69619644963296,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.477680266790003,
   "start_distance_m": 562.0,
   "end_distance_m": 567.0,
   "midpoint_distance_m": 564.5,
   "start_elevation_m": 297.6328174657417,
   "end_elevation_m": 298.8567014790812,
   "start_xy": [
    338878.10825456626,
    296956.4436516803
   ],
   "end_xy": [
    338874.8722674215,
    296960.2552638325
   ]
  },
  "max_10m": {
   "gradient_pct": 23.354661964293655,
   "start_distance_m": 560.0,
   "end_distance_m": 570.0,
   "midpoint_distance_m": 565.0,
   "start_elevation_m": 297.175326712877,
   "end_elevation_m": 299.51079290930636,
   "start_xy": [
    338879.4026494242,
    296954.91900681943
   ],
   "end_xy": [
    338872.93067513464,
    296962.54223112384
   ]
  },
  "max_20m": {
   "gradient_pct": 22.21593084613886,
   "start_distance_m": 549.0,
   "end_distance_m": 569.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 294.8839938962072,
   "end_elevation_m": 299.32718006543496,
   "start_xy": [
    338886.52182114276,
    296946.5334600846
   ],
   "end_xy": [
    338873.57787256356,
    296961.7799086934
   ]
  },
  "max_25m": {
   "gradient_pct": 21.83299999824999,
   "start_distance_m": 549.0,
   "end_distance_m": 574.0,
   "midpoint_distance_m": 561.5,
   "start_elevation_m": 294.8839938962072,
   "end_elevation_m": 300.3422438957697,
   "start_xy": [
    338886.52182114276,
    296946.5334600846
   ],
   "end_xy": [
    338870.9503919642,
    296965.9690479117
   ]
  },
  "max_50m": {
   "gradient_pct": 20.443159447794983,
   "start_distance_m": 538.0,
   "end_distance_m": 588.0,
   "midpoint_distance_m": 563.0,
   "start_elevation_m": 292.74426581661413,
   "end_elevation_m": 302.9658455405116,
   "start_xy": [
    338893.6606887127,
    296938.1652382437
   ],
   "end_xy": [
    338865.41239509,
    296978.8271422737
   ]
  },
  "max_100m": {
   "gradient_pct": 18.906827209999506,
   "start_distance_m": 507.0,
   "end_distance_m": 607.0,
   "midpoint_distance_m": 557.0,
   "start_elevation_m": 287.3783726558792,
   "end_elevation_m": 306.2851998658787,
   "start_xy": [
    338917.2548493189,
    296918.4919086249
   ],
   "end_xy": [
    338857.8965421893,
    296996.27741319354
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.354475685558782,
   "start_distance_m": 2083.0,
   "end_distance_m": 2088.0,
   "midpoint_distance_m": 2085.5,
   "start_elevation_m": 390.79254821503343,
   "end_elevation_m": 389.8748244307555,
   "start_xy": [
    337569.75288446195,
    297625.4411337963
   ],
   "end_xy": [
    337564.95648751536,
    297626.8534285002
   ]
  },
  "min_10m": {
   "gradient_pct": -16.537367036252704,
   "start_distance_m": 2083.0,
   "end_distance_m": 2093.0,
   "midpoint_distance_m": 2088.0,
   "start_elevation_m": 390.79254821503343,
   "end_elevation_m": 389.13881151140816,
   "start_xy": [
    337569.75288446195,
    297625.4411337963
   ],
   "end_xy": [
    337560.1600905687,
    297628.26572320407
   ]
  },
  "min_20m": {
   "gradient_pct": -10.029347659006191,
   "start_distance_m": 2081.0,
   "end_distance_m": 2101.0,
   "midpoint_distance_m": 2091.0,
   "start_elevation_m": 390.8106219189902,
   "end_elevation_m": 388.80475238718896,
   "start_xy": [
    337571.6714432406,
    297624.87621591473
   ],
   "end_xy": [
    337552.4858554542,
    297630.52539473027
   ]
  },
  "min_25m": {
   "gradient_pct": -7.735008405481494,
   "start_distance_m": 2082.0,
   "end_distance_m": 2107.0,
   "midpoint_distance_m": 2094.5,
   "start_elevation_m": 390.8271526746739,
   "end_elevation_m": 388.89340057330355,
   "start_xy": [
    337570.71216385125,
    297625.1586748555
   ],
   "end_xy": [
    337546.7301791182,
    297632.2201483749
   ]
  },
  "min_50m": {
   "gradient_pct": -5.049979454576487,
   "start_distance_m": 1017.0,
   "end_distance_m": 1067.0,
   "midpoint_distance_m": 1042.0,
   "start_elevation_m": 346.45427903303084,
   "end_elevation_m": 343.9292893057426,
   "start_xy": [
    338500.68121233914,
    297181.00066766207
   ],
   "end_xy": [
    338452.626527022,
    297193.51725345646
   ]
  },
  "min_100m": {
   "gradient_pct": -4.52718280307829,
   "start_distance_m": 999.0,
   "end_distance_m": 1099.0,
   "midpoint_distance_m": 1049.0,
   "start_elevation_m": 347.20128933720537,
   "end_elevation_m": 342.6741065341271,
   "start_xy": [
    338518.3573484467,
    297177.6218591735
   ],
   "end_xy": [
    338424.3741101835,
    297208.44744084025
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.653368191660775,
   "start_distance_m": 564.0,
   "end_distance_m": 566.0,
   "midpoint_distance_m": 565.0,
   "start_elevation_m": 298.11823049240274,
   "end_elevation_m": 298.63129785623596,
   "start_xy": [
    338876.8138597084,
    296957.9682965412
   ],
   "end_xy": [
    338875.5194648504,
    296959.4929414021
   ]
  },
  "max_3m": {
   "gradient_pct": 25.068655916908256,
   "start_distance_m": 563.0,
   "end_distance_m": 566.0,
   "midpoint_distance_m": 564.5,
   "start_elevation_m": 297.8792381787287,
   "end_elevation_m": 298.63129785623596,
   "start_xy": [
    338877.46105713735,
    296957.20597411075
   ],
   "end_xy": [
    338875.5194648504,
    296959.4929414021
   ]
  }
 },
 "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": [
   "descends_at_start"
  ]
 },
 "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/SO3595.tif"
  ],
  "calculated_at": "2026-09-01T06:36:24+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-05-260901",
  "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": [
   "SO3595.tif"
  ],
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 28] No space left on device: 'data/cache/england/bulk_dsm_1m/SO3595.tmp.tif'",
  "trimmed_from": "discovered-lane-52-5667-2-9026",
  "trim_cut_m": [
   [
    2758.1,
    2893.3
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bridges",
  "county": "Shropshire"
 }
}