{
 "ocl_version": "0.1.0",
 "name": "St Michael Caerhays to Trevarrick",
 "slug": "discovered-lane-50-2529-4-8346",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 43.90721541767846,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 942.0,
   "end_distance_m": 944.0,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 23.470394754781807,
   "min_gradient_pct": -68.21207231165545,
   "suppressed_max_gradient_pct": 56.804550409871624,
   "suppressed_location_m": [
    885.0,
    887.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 37.95152818694376,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 942.0,
   "end_distance_m": 945.0,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 23.73079629203655,
   "min_gradient_pct": -59.91543267699816,
   "suppressed_max_gradient_pct": 48.51864600674697,
   "suppressed_location_m": [
    884.0,
    887.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.715490698852733,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 942.0,
   "end_distance_m": 947.0,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 24.178024981370875,
   "min_gradient_pct": -46.975181565918405,
   "suppressed_max_gradient_pct": 39.36825449908838,
   "suppressed_location_m": [
    883.0,
    888.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.673910696839396,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 137.0,
   "end_distance_m": 147.0,
   "start_elevation_m": 14.629227877700595,
   "end_elevation_m": 17.096618947384535,
   "min_gradient_pct": -40.03586950951345,
   "suppressed_max_gradient_pct": 28.478286264684876,
   "suppressed_location_m": [
    883.0,
    893.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.63663631448594,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2768.0,
   "end_distance_m": 2788.0,
   "start_elevation_m": 62.339491626230426,
   "end_elevation_m": 66.86681888912761,
   "min_gradient_pct": -27.082435953657154
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.070710265934537,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2766.0,
   "end_distance_m": 2791.0,
   "start_elevation_m": 61.89727431873134,
   "end_elevation_m": 67.41495188521498,
   "min_gradient_pct": -24.131638760690436
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.38518113487305,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2741.0,
   "end_distance_m": 2791.0,
   "start_elevation_m": 58.22236131777845,
   "end_elevation_m": 67.41495188521498,
   "min_gradient_pct": -16.710500974613893
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.055659450128665,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2718.0,
   "end_distance_m": 2818.0,
   "start_elevation_m": 55.94898214043659,
   "end_elevation_m": 70.00464159056526,
   "min_gradient_pct": -12.359214352412422
  }
 ],
 "shape": {
  "ascent_concentration": 0.335,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 70.0,
  "shape_class": "sustained"
 },
 "length_m": 3238.2655892597772,
 "start_elevation_m": 13.569863712894886,
 "end_elevation_m": 80.73879728126511,
 "endpoint_gain_m": 67.16893356837022,
 "overall_gradient_pct": 2.0742255913519467,
 "accumulated_ascent_m": 153.950665448234,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.715490698852733,
   "start_distance_m": 942.0,
   "end_distance_m": 947.0,
   "midpoint_distance_m": 944.5,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 24.178024981370875,
   "start_xy": [
    196852.37058176674,
    43055.821524687686
   ],
   "end_xy": [
    196855.10170690308,
    43051.63333262861
   ]
  },
  "max_10m": {
   "gradient_pct": 24.673910696839396,
   "start_distance_m": 137.0,
   "end_distance_m": 147.0,
   "midpoint_distance_m": 142.0,
   "start_elevation_m": 14.629227877700595,
   "end_elevation_m": 17.096618947384535,
   "start_xy": [
    196218.94856712644,
    43207.25982228416
   ],
   "end_xy": [
    196228.18576145728,
    43203.429127152616
   ]
  },
  "max_20m": {
   "gradient_pct": 22.63663631448594,
   "start_distance_m": 2768.0,
   "end_distance_m": 2788.0,
   "midpoint_distance_m": 2778.0,
   "start_elevation_m": 62.339491626230426,
   "end_elevation_m": 66.86681888912761,
   "start_xy": [
    198389.62298721875,
    43107.74827987038
   ],
   "end_xy": [
    198407.42590917298,
    43100.688718376325
   ]
  },
  "max_25m": {
   "gradient_pct": 22.070710265934537,
   "start_distance_m": 2766.0,
   "end_distance_m": 2791.0,
   "midpoint_distance_m": 2778.5,
   "start_elevation_m": 61.89727431873134,
   "end_elevation_m": 67.41495188521498,
   "start_xy": [
    198387.70414480977,
    43107.184326211005
   ],
   "end_xy": [
    198410.18642643752,
    43099.522028761276
   ]
  },
  "max_50m": {
   "gradient_pct": 18.38518113487305,
   "start_distance_m": 2741.0,
   "end_distance_m": 2791.0,
   "midpoint_distance_m": 2766.0,
   "start_elevation_m": 58.22236131777845,
   "end_elevation_m": 67.41495188521498,
   "start_xy": [
    198365.06399805468,
    43096.751414733626
   ],
   "end_xy": [
    198410.18642643752,
    43099.522028761276
   ]
  },
  "max_100m": {
   "gradient_pct": 14.055659450128665,
   "start_distance_m": 2718.0,
   "end_distance_m": 2818.0,
   "midpoint_distance_m": 2768.0,
   "start_elevation_m": 55.94898214043659,
   "end_elevation_m": 70.00464159056526,
   "start_xy": [
    198344.00255717424,
    43087.52058006946
   ],
   "end_xy": [
    198436.3865462364,
    43094.05823516875
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -46.975181565918405,
   "start_distance_m": 2630.0,
   "end_distance_m": 2635.0,
   "midpoint_distance_m": 2632.5,
   "start_elevation_m": 61.92219156826364,
   "end_elevation_m": 59.57343248996772,
   "start_xy": [
    198261.86353247485,
    43096.54525683588
   ],
   "end_xy": [
    198266.51589645358,
    43094.713453653756
   ]
  },
  "min_10m": {
   "gradient_pct": -40.03586950951345,
   "start_distance_m": 2624.0,
   "end_distance_m": 2634.0,
   "midpoint_distance_m": 2629.0,
   "start_elevation_m": 63.827025549964176,
   "end_elevation_m": 59.82343859901283,
   "start_xy": [
    198256.28057120924,
    43098.74310565651
   ],
   "end_xy": [
    198265.58554273553,
    43095.08011688084
   ]
  },
  "min_20m": {
   "gradient_pct": -27.082435953657154,
   "start_distance_m": 2623.0,
   "end_distance_m": 2643.0,
   "midpoint_distance_m": 2633.0,
   "start_elevation_m": 63.98009741463852,
   "end_elevation_m": 58.56361022390709,
   "start_xy": [
    198255.35006690837,
    43099.10938657154
   ],
   "end_xy": [
    198273.9599637382,
    43091.78329172912
   ]
  },
  "min_25m": {
   "gradient_pct": -24.131638760690436,
   "start_distance_m": 2622.0,
   "end_distance_m": 2647.0,
   "midpoint_distance_m": 2634.5,
   "start_elevation_m": 64.14474076285767,
   "end_elevation_m": 58.11183107268506,
   "start_xy": [
    198254.41941864646,
    43099.475301584745
   ],
   "end_xy": [
    198277.68202030618,
    43090.31826940607
   ]
  },
  "min_50m": {
   "gradient_pct": -16.710500974613893,
   "start_distance_m": 2622.0,
   "end_distance_m": 2672.0,
   "midpoint_distance_m": 2647.0,
   "start_elevation_m": 64.14474076285767,
   "end_elevation_m": 55.78949027555072,
   "start_xy": [
    198254.41941864646,
    43099.475301584745
   ],
   "end_xy": [
    198300.95311621513,
    43081.18362267673
   ]
  },
  "min_100m": {
   "gradient_pct": -12.359214352412422,
   "start_distance_m": 2577.0,
   "end_distance_m": 2677.0,
   "midpoint_distance_m": 2627.0,
   "start_elevation_m": 67.78862688737908,
   "end_elevation_m": 55.42941253496666,
   "start_xy": [
    198220.36403512425,
    43089.9379875897
   ],
   "end_xy": [
    198305.66525416772,
    43079.51157381547
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 43.90721541767846,
   "start_distance_m": 942.0,
   "end_distance_m": 944.0,
   "midpoint_distance_m": 943.0,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 23.470394754781807,
   "start_xy": [
    196852.37058176674,
    43055.821524687686
   ],
   "end_xy": [
    196853.46284256174,
    43054.1461244199
   ]
  },
  "max_3m": {
   "gradient_pct": 37.95152818694376,
   "start_distance_m": 942.0,
   "end_distance_m": 945.0,
   "midpoint_distance_m": 943.5,
   "start_elevation_m": 22.59225044642824,
   "end_elevation_m": 23.73079629203655,
   "start_xy": [
    196852.37058176674,
    43055.821524687686
   ],
   "end_xy": [
    196854.00908055704,
    43053.3084945031
   ]
  }
 },
 "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": 0.141,
   "obstruction_max_height_m": 20.53,
   "flagged_windows_m": [
    2,
    3,
    5,
    10
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    883.0,
    888.0
   ],
   [
    2630.0,
    2636.0
   ]
  ],
  "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/SW9540.tif"
  ],
  "calculated_at": "2026-08-19T18:07:50+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": [
   "SW9540.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.3% over 200 m (Terrain 50), gain 45.9 m over 2604 m way. EXTENDED by graph walk: +1 segment(s) at base, +2 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 (50.2529, -4.8346)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.2529, -4.8346)'"
 },
 "area": {
  "place": "St Michael Caerhays",
  "county": "Cornwall"
 }
}