{
 "ocl_version": "0.1.0",
 "name": "Lane near Boscastle",
 "slug": "discovered-lane-50-6770-4-6868",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.23878636171008,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 310.0,
   "end_distance_m": 312.0,
   "start_elevation_m": 152.50517915129183,
   "end_elevation_m": 153.44995487852603,
   "min_gradient_pct": -40.385811690720175,
   "suppressed_max_gradient_pct": 59.84727046508738,
   "suppressed_location_m": [
    299.0,
    301.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.62454580945988,
   "diagnostic": true,
   "flags": [
    "placement_excluded"
   ],
   "start_distance_m": 310.0,
   "end_distance_m": 313.0,
   "start_elevation_m": 152.50517915129183,
   "end_elevation_m": 153.81391552557562,
   "min_gradient_pct": -28.077471475118426,
   "suppressed_max_gradient_pct": 51.81991339476232,
   "suppressed_location_m": [
    264.0,
    267.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.27762905738143,
   "diagnostic": false,
   "flags": [
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 489.0,
   "end_distance_m": 494.0,
   "start_elevation_m": 176.50945270443466,
   "end_elevation_m": 178.27333415730374,
   "min_gradient_pct": -13.30944893861954,
   "suppressed_max_gradient_pct": 47.31947676283767,
   "suppressed_location_m": [
    263.0,
    268.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.040804162774748,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "placement_excluded"
   ],
   "start_distance_m": 102.0,
   "end_distance_m": 112.0,
   "start_elevation_m": 117.11641190343491,
   "end_elevation_m": 119.62049231971238,
   "min_gradient_pct": -9.076294754005403,
   "suppressed_max_gradient_pct": 34.23129268056414,
   "suppressed_location_m": [
    294.0,
    304.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.283519350441082,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 489.0,
   "end_distance_m": 509.0,
   "start_elevation_m": 176.50945270443466,
   "end_elevation_m": 180.76615657452288,
   "min_gradient_pct": -2.9824007854209356,
   "suppressed_max_gradient_pct": 24.14312500796811,
   "suppressed_location_m": [
    285.0,
    305.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 19.356078614745343,
   "diagnostic": false,
   "flags": [
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 196.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 132.839264544513,
   "end_elevation_m": 137.67828419819932,
   "min_gradient_pct": -0.5411492612561233,
   "suppressed_max_gradient_pct": 22.03531389113573,
   "suppressed_location_m": [
    252.0,
    277.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.32269973545101,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 171.0,
   "end_distance_m": 221.0,
   "start_elevation_m": 128.51693433047382,
   "end_elevation_m": 137.67828419819932,
   "min_gradient_pct": 1.1856236026491729,
   "suppressed_max_gradient_pct": 20.054224818547823,
   "suppressed_location_m": [
    255.0,
    305.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.28917796658247,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 146.0,
   "end_distance_m": 246.0,
   "start_elevation_m": 124.3195965108713,
   "end_elevation_m": 141.60877447745378,
   "min_gradient_pct": 1.5849807896278492,
   "suppressed_max_gradient_pct": 18.629264899863415,
   "suppressed_location_m": [
    204.0,
    304.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.418,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 170.0,
  "shape_class": "sustained"
 },
 "length_m": 1598.784420743557,
 "start_elevation_m": 102.27320070999153,
 "end_elevation_m": 244.96002430549552,
 "endpoint_gain_m": 142.686823595504,
 "overall_gradient_pct": 8.924706905083784,
 "accumulated_ascent_m": 158.2134802463411,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.27762905738143,
   "start_distance_m": 489.0,
   "end_distance_m": 494.0,
   "midpoint_distance_m": 491.5,
   "start_elevation_m": 176.50945270443466,
   "end_elevation_m": 178.27333415730374,
   "start_xy": [
    210219.73368130054,
    90099.82346129756
   ],
   "end_xy": [
    210219.8106871211,
    90094.82405493142
   ]
  },
  "max_10m": {
   "gradient_pct": 25.040804162774748,
   "start_distance_m": 102.0,
   "end_distance_m": 112.0,
   "midpoint_distance_m": 107.0,
   "start_elevation_m": 117.11641190343491,
   "end_elevation_m": 119.62049231971238,
   "start_xy": [
    210045.44094577714,
    90430.88937508935
   ],
   "end_xy": [
    210050.07989447052,
    90422.0304730584
   ]
  },
  "max_20m": {
   "gradient_pct": 21.283519350441082,
   "start_distance_m": 489.0,
   "end_distance_m": 509.0,
   "midpoint_distance_m": 499.0,
   "start_elevation_m": 176.50945270443466,
   "end_elevation_m": 180.76615657452288,
   "start_xy": [
    210219.73368130054,
    90099.82346129756
   ],
   "end_xy": [
    210220.12309102723,
    90079.83028734816
   ]
  },
  "max_25m": {
   "gradient_pct": 19.356078614745343,
   "start_distance_m": 196.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 208.5,
   "start_elevation_m": 132.839264544513,
   "end_elevation_m": 137.67828419819932,
   "start_xy": [
    210078.6403746448,
    90343.91459047454
   ],
   "end_xy": [
    210080.84367982726,
    90319.01841705131
   ]
  },
  "max_50m": {
   "gradient_pct": 18.32269973545101,
   "start_distance_m": 171.0,
   "end_distance_m": 221.0,
   "midpoint_distance_m": 196.0,
   "start_elevation_m": 128.51693433047382,
   "end_elevation_m": 137.67828419819932,
   "start_xy": [
    210074.5611325328,
    90368.44698549129
   ],
   "end_xy": [
    210080.84367982726,
    90319.01841705131
   ]
  },
  "max_100m": {
   "gradient_pct": 17.28917796658247,
   "start_distance_m": 146.0,
   "end_distance_m": 246.0,
   "midpoint_distance_m": 196.0,
   "start_elevation_m": 124.3195965108713,
   "end_elevation_m": 141.60877447745378,
   "start_xy": [
    210065.38948042513,
    90391.68924992357
   ],
   "end_xy": [
    210083.31282740648,
    90294.18955921898
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.30944893861954,
   "start_distance_m": 820.0,
   "end_distance_m": 825.0,
   "midpoint_distance_m": 822.5,
   "start_elevation_m": 209.69500242970142,
   "end_elevation_m": 209.02952998277044,
   "start_xy": [
    210267.57143229418,
    89772.89183448865
   ],
   "end_xy": [
    210267.85717078712,
    89767.90214711562
   ]
  },
  "min_10m": {
   "gradient_pct": -9.076294754005403,
   "start_distance_m": 817.0,
   "end_distance_m": 827.0,
   "midpoint_distance_m": 822.0,
   "start_elevation_m": 209.91969231905213,
   "end_elevation_m": 209.0120628436516,
   "start_xy": [
    210267.3055500939,
    89775.88002872345
   ],
   "end_xy": [
    210267.90318044263,
    89765.90267640789
   ]
  },
  "min_20m": {
   "gradient_pct": -2.9824007854209356,
   "start_distance_m": 808.0,
   "end_distance_m": 828.0,
   "midpoint_distance_m": 818.0,
   "start_elevation_m": 209.73248980977354,
   "end_elevation_m": 209.13600965268935,
   "start_xy": [
    210266.5104321606,
    89784.84483600031
   ],
   "end_xy": [
    210267.92617436152,
    89764.90294080299
   ]
  },
  "min_25m": {
   "gradient_pct": -0.5411492612561233,
   "start_distance_m": 1250.0,
   "end_distance_m": 1275.0,
   "midpoint_distance_m": 1262.5,
   "start_elevation_m": 236.9198319998306,
   "end_elevation_m": 236.78454468451656,
   "start_xy": [
    210413.67297463786,
    89380.64145434354
   ],
   "end_xy": [
    210424.14086858035,
    89357.94211305371
   ]
  },
  "min_50m": {
   "gradient_pct": 1.1856236026491729,
   "start_distance_m": 1249.0,
   "end_distance_m": 1299.0,
   "midpoint_distance_m": 1274.0,
   "start_elevation_m": 236.9070023006703,
   "end_elevation_m": 237.4998141019949,
   "start_xy": [
    210413.30210108415,
    89381.57013771648
   ],
   "end_xy": [
    210438.28327531484,
    89338.6532196019
   ]
  },
  "min_100m": {
   "gradient_pct": 1.5849807896278492,
   "start_distance_m": 1343.0,
   "end_distance_m": 1443.0,
   "midpoint_distance_m": 1393.0,
   "start_elevation_m": 239.2257998498385,
   "end_elevation_m": 240.81078063946634,
   "start_xy": [
    210465.5713499067,
    89304.13712527926
   ],
   "end_xy": [
    210528.4913138373,
    89226.43683905047
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.23878636171008,
   "start_distance_m": 310.0,
   "end_distance_m": 312.0,
   "midpoint_distance_m": 311.0,
   "start_elevation_m": 152.50517915129183,
   "end_elevation_m": 153.44995487852603,
   "start_xy": [
    210112.83083715252,
    90238.31834133339
   ],
   "end_xy": [
    210113.95794518836,
    90236.66618311065
   ]
  },
  "max_3m": {
   "gradient_pct": 43.62454580945988,
   "start_distance_m": 310.0,
   "end_distance_m": 313.0,
   "midpoint_distance_m": 311.5,
   "start_elevation_m": 152.50517915129183,
   "end_elevation_m": 153.81391552557562,
   "start_xy": [
    210112.83083715252,
    90238.31834133339
   ],
   "end_xy": [
    210114.52184031362,
    90235.8403367038
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.008,
   "windows_resited": [
    2.0,
    10.0,
    20.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "placement_suppression": {
   "masked_fraction": 0.027,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.094,
   "obstruction_max_height_m": 8.55,
   "flagged_windows_m": [
    2,
    5,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    260.0,
    290.0
   ],
   [
    298.0,
    309.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/SX1085.tif",
   "data/cache/england/bulk_dtm_1m/SX0590.tif",
   "data/cache/england/bulk_dtm_1m/SX1090.tif"
  ],
  "calculated_at": "2026-08-31T05:49:06+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",
  "run_id": "placement-mask-260831",
  "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": [
   "SX1085.tif",
   "SX0590.tif",
   "SX1090.tif"
  ],
  "climb_origin": "discovered",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.6770, -4.6868)'",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Boscastle",
  "county": "Cornwall"
 }
}