{
 "ocl_version": "0.1.0",
 "name": "Pattard Water to Exmansworthy",
 "slug": "discovered-lane-51-0014-4-4718",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 45.977120274529426,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 102.43368347891357,
   "end_elevation_m": 103.35322588440415,
   "min_gradient_pct": -12.542910821159126,
   "suppressed_max_gradient_pct": 73.70909841720135,
   "suppressed_location_m": [
    284.0,
    286.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 41.21545248549173,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 310.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 101.69808799048758,
   "end_elevation_m": 102.93455156505233,
   "min_gradient_pct": -9.986294807379181,
   "suppressed_max_gradient_pct": 56.40306660269422,
   "suppressed_location_m": [
    283.0,
    286.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 36.62917613582749,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 309.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 101.52176707761278,
   "end_elevation_m": 103.35322588440415,
   "min_gradient_pct": -9.970282631988994,
   "suppressed_max_gradient_pct": 48.24201893930251,
   "suppressed_location_m": [
    281.0,
    286.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.562585016295145,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 304.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 100.29696738277464,
   "end_elevation_m": 103.35322588440415,
   "min_gradient_pct": -6.519805264718173,
   "suppressed_max_gradient_pct": 38.14462011815479,
   "suppressed_location_m": [
    276.0,
    286.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.15007390803048,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 294.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 98.52321110279806,
   "end_elevation_m": 103.35322588440415,
   "min_gradient_pct": -3.9371101346668524,
   "suppressed_max_gradient_pct": 29.383159900385607,
   "suppressed_location_m": [
    266.0,
    286.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.586604117359798,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 301.0,
   "end_distance_m": 326.0,
   "start_elevation_m": 99.60376732357537,
   "end_elevation_m": 105.25041835291532,
   "min_gradient_pct": -3.3644886632163207,
   "suppressed_max_gradient_pct": 27.511154994612017,
   "suppressed_location_m": [
    261.0,
    286.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.573745158451743,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 232.0,
   "end_distance_m": 282.0,
   "start_elevation_m": 85.29464241030638,
   "end_elevation_m": 95.58151498953225,
   "min_gradient_pct": -2.2172543080635023,
   "suppressed_max_gradient_pct": 24.011023312553192,
   "suppressed_location_m": [
    264.0,
    314.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.964084484519644,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 289.0,
   "end_distance_m": 389.0,
   "start_elevation_m": 97.9381200245547,
   "end_elevation_m": 113.90220450907435,
   "min_gradient_pct": -0.28129935383805105,
   "suppressed_max_gradient_pct": 21.28899283963669,
   "suppressed_location_m": [
    239.0,
    339.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.542,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 151.0,
  "shape_class": "stepped"
 },
 "length_m": 1230.7422033263897,
 "start_elevation_m": 75.7879536296385,
 "end_elevation_m": 142.83423336792004,
 "endpoint_gain_m": 67.04627973828154,
 "overall_gradient_pct": 5.447629857582858,
 "accumulated_ascent_m": 71.59919586522345,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 36.62917613582749,
   "start_distance_m": 309.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 311.5,
   "start_elevation_m": 101.52176707761278,
   "end_elevation_m": 103.35322588440415,
   "start_xy": [
    226371.68944147936,
    125106.8768582385
   ],
   "end_xy": [
    226375.61380387124,
    125109.97514445882
   ]
  },
  "max_10m": {
   "gradient_pct": 30.562585016295145,
   "start_distance_m": 304.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 309.0,
   "start_elevation_m": 100.29696738277464,
   "end_elevation_m": 103.35322588440415,
   "start_xy": [
    226367.76469515866,
    125103.77905859664
   ],
   "end_xy": [
    226375.61380387124,
    125109.97514445882
   ]
  },
  "max_20m": {
   "gradient_pct": 24.15007390803048,
   "start_distance_m": 294.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 304.0,
   "start_elevation_m": 98.52321110279806,
   "end_elevation_m": 103.35322588440415,
   "start_xy": [
    226359.91526395173,
    125097.58338138359
   ],
   "end_xy": [
    226375.61380387124,
    125109.97514445882
   ]
  },
  "max_25m": {
   "gradient_pct": 22.586604117359798,
   "start_distance_m": 301.0,
   "end_distance_m": 326.0,
   "midpoint_distance_m": 313.5,
   "start_elevation_m": 99.60376732357537,
   "end_elevation_m": 105.25041835291532,
   "start_xy": [
    226365.40962232466,
    125101.92066397321
   ],
   "end_xy": [
    226385.2853913456,
    125117.07756250315
   ]
  },
  "max_50m": {
   "gradient_pct": 20.573745158451743,
   "start_distance_m": 232.0,
   "end_distance_m": 282.0,
   "midpoint_distance_m": 257.0,
   "start_elevation_m": 85.29464241030638,
   "end_elevation_m": 95.58151498953225,
   "start_xy": [
    226319.40285510902,
    125052.38515381805
   ],
   "end_xy": [
    226350.49577586816,
    125090.14878504764
   ]
  },
  "max_100m": {
   "gradient_pct": 15.964084484519644,
   "start_distance_m": 289.0,
   "end_distance_m": 389.0,
   "midpoint_distance_m": 339.0,
   "start_elevation_m": 97.9381200245547,
   "end_elevation_m": 113.90220450907435,
   "start_xy": [
    226355.99051778822,
    125094.48558154255
   ],
   "end_xy": [
    226434.91730221722,
    125155.72843623978
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.970282631988994,
   "start_distance_m": 976.0,
   "end_distance_m": 981.0,
   "midpoint_distance_m": 978.5,
   "start_elevation_m": 133.57871135005996,
   "end_elevation_m": 133.0801972184605,
   "start_xy": [
    226614.48966739466,
    125595.96823428977
   ],
   "end_xy": [
    226613.30972121737,
    125600.82701261317
   ]
  },
  "min_10m": {
   "gradient_pct": -6.519805264718173,
   "start_distance_m": 972.0,
   "end_distance_m": 982.0,
   "midpoint_distance_m": 977.0,
   "start_elevation_m": 133.69726358486818,
   "end_elevation_m": 133.04528305839636,
   "start_xy": [
    226615.4336701916,
    125592.08122277033
   ],
   "end_xy": [
    226613.0936713731,
    125601.80310746918
   ]
  },
  "min_20m": {
   "gradient_pct": -3.9371101346668524,
   "start_distance_m": 75.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 85.0,
   "start_elevation_m": 80.22303757072658,
   "end_elevation_m": 79.4356155437932,
   "start_xy": [
    226166.6632484422,
    125017.64671291731
   ],
   "end_xy": [
    226186.3870636055,
    125020.91428521898
   ]
  },
  "min_25m": {
   "gradient_pct": -3.3644886632163207,
   "start_distance_m": 957.0,
   "end_distance_m": 982.0,
   "midpoint_distance_m": 969.5,
   "start_elevation_m": 133.88640522420044,
   "end_elevation_m": 133.04528305839636,
   "start_xy": [
    226620.73993250314,
    125578.2178222768
   ],
   "end_xy": [
    226613.0936713731,
    125601.80310746918
   ]
  },
  "min_50m": {
   "gradient_pct": -2.2172543080635023,
   "start_distance_m": 931.0,
   "end_distance_m": 981.0,
   "midpoint_distance_m": 956.0,
   "start_elevation_m": 134.18882437249226,
   "end_elevation_m": 133.0801972184605,
   "start_xy": [
    226631.18603025275,
    125554.54199808919
   ],
   "end_xy": [
    226613.30972121737,
    125600.82701261317
   ]
  },
  "min_100m": {
   "gradient_pct": -0.28129935383805105,
   "start_distance_m": 882.0,
   "end_distance_m": 982.0,
   "midpoint_distance_m": 932.0,
   "start_elevation_m": 133.32658241223442,
   "end_elevation_m": 133.04528305839636,
   "start_xy": [
    226647.63859328514,
    125508.41700957033
   ],
   "end_xy": [
    226613.0936713731,
    125601.80310746918
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 45.977120274529426,
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 102.43368347891357,
   "end_elevation_m": 103.35322588440415,
   "start_xy": [
    226374.04419204095,
    125108.7356612298
   ],
   "end_xy": [
    226375.61380387124,
    125109.97514445882
   ]
  },
  "max_3m": {
   "gradient_pct": 41.21545248549173,
   "start_distance_m": 310.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 311.5,
   "start_elevation_m": 101.69808799048758,
   "end_elevation_m": 102.93455156505233,
   "start_xy": [
    226372.47436000124,
    125107.496457122
   ],
   "end_xy": [
    226374.8289812638,
    125109.3554239825
   ]
  }
 },
 "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": 0.065,
   "obstruction_max_height_m": 16.38,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    283.0,
    288.0
   ]
  ],
  "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/SS2520.tif",
   "data/cache/england/bulk_dtm_1m/SS2525.tif"
  ],
  "calculated_at": "2026-08-19T18:21:32+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": [
   "SS2520.tif",
   "SS2525.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.4% over 200 m (Terrain 50), gain 57.2 m over 1163 m way. EXTENDED by graph walk: +2 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. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (51.0014, -4.4718)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.0014, -4.4718)'"
 },
 "area": {
  "place": "Hartland",
  "county": "Devon"
 }
}