{
 "ocl_version": "0.1.0",
 "name": "Tremail to Trevivian",
 "slug": "discovered-lane-50-6466-4-5928",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.319531697131254,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 220.0,
   "end_distance_m": 222.0,
   "start_elevation_m": 239.21918862715407,
   "end_elevation_m": 240.1055792610967,
   "min_gradient_pct": -39.76454613758165
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.533595436229085,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 219.0,
   "end_distance_m": 222.0,
   "start_elevation_m": 238.88957139800982,
   "end_elevation_m": 240.1055792610967,
   "min_gradient_pct": -25.51372488699049
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.337549089034155,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 219.0,
   "end_distance_m": 224.0,
   "start_elevation_m": 238.88957139800982,
   "end_elevation_m": 240.80644885246153,
   "min_gradient_pct": -19.337000470350745
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.920926082226174,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 215.0,
   "end_distance_m": 225.0,
   "start_elevation_m": 238.2036189594088,
   "end_elevation_m": 240.99571156763142,
   "min_gradient_pct": -11.145185238653426
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.013521927374626,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 205.0,
   "end_distance_m": 225.0,
   "start_elevation_m": 236.1930071821565,
   "end_elevation_m": 240.99571156763142,
   "min_gradient_pct": -9.16712847358852
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.40248928113715,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 200.0,
   "end_distance_m": 225.0,
   "start_elevation_m": 235.39508924734713,
   "end_elevation_m": 240.99571156763142,
   "min_gradient_pct": -8.913993264615328
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.941369517606518,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 174.0,
   "end_distance_m": 224.0,
   "start_elevation_m": 231.33576409365827,
   "end_elevation_m": 240.80644885246153,
   "min_gradient_pct": -7.171000320930148
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.060972344642494,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "start_elevation_m": 226.6430083537058,
   "end_elevation_m": 242.7039806983483,
   "min_gradient_pct": -5.103042891010261
  }
 ],
 "shape": {
  "ascent_concentration": 0.406,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 102.0,
  "shape_class": "sustained"
 },
 "length_m": 1545.2414771097333,
 "start_elevation_m": 218.7450878926997,
 "end_elevation_m": 271.76232050952154,
 "endpoint_gain_m": 53.01723261682184,
 "overall_gradient_pct": 3.4309998406195312,
 "accumulated_ascent_m": 78.9487241415749,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.337549089034155,
   "start_distance_m": 219.0,
   "end_distance_m": 224.0,
   "midpoint_distance_m": 221.5,
   "start_elevation_m": 238.88957139800982,
   "end_elevation_m": 240.80644885246153,
   "start_xy": [
    216882.41675678876,
    86325.35101310065
   ],
   "end_xy": [
    216881.32257778695,
    86320.47220511442
   ]
  },
  "max_10m": {
   "gradient_pct": 27.920926082226174,
   "start_distance_m": 215.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 220.0,
   "start_elevation_m": 238.2036189594088,
   "end_elevation_m": 240.99571156763142,
   "start_xy": [
    216883.29157169664,
    86329.25417797221
   ],
   "end_xy": [
    216881.10385182814,
    86319.49642106314
   ]
  },
  "max_20m": {
   "gradient_pct": 24.013521927374626,
   "start_distance_m": 205.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 215.0,
   "start_elevation_m": 236.1930071821565,
   "end_elevation_m": 240.99571156763142,
   "start_xy": [
    216885.47971822676,
    86339.0118414205
   ],
   "end_xy": [
    216881.10385182814,
    86319.49642106314
   ]
  },
  "max_25m": {
   "gradient_pct": 22.40248928113715,
   "start_distance_m": 200.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 212.5,
   "start_elevation_m": 235.39508924734713,
   "end_elevation_m": 240.99571156763142,
   "start_xy": [
    216886.57274569574,
    86343.89090733498
   ],
   "end_xy": [
    216881.10385182814,
    86319.49642106314
   ]
  },
  "max_50m": {
   "gradient_pct": 18.941369517606518,
   "start_distance_m": 174.0,
   "end_distance_m": 224.0,
   "midpoint_distance_m": 199.0,
   "start_elevation_m": 231.33576409365827,
   "end_elevation_m": 240.80644885246153,
   "start_xy": [
    216892.26077437223,
    86369.26109138325
   ],
   "end_xy": [
    216881.32257778695,
    86320.47220511442
   ]
  },
  "max_100m": {
   "gradient_pct": 16.060972344642494,
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 187.0,
   "start_elevation_m": 226.6430083537058,
   "end_elevation_m": 242.7039806983483,
   "start_xy": [
    216905.2301994608,
    86403.704015829
   ],
   "end_xy": [
    216878.74683863285,
    86307.73018213689
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -19.337000470350745,
   "start_distance_m": 483.0,
   "end_distance_m": 488.0,
   "midpoint_distance_m": 485.5,
   "start_elevation_m": 239.98919988638693,
   "end_elevation_m": 239.0223498628694,
   "start_xy": [
    216732.81710112805,
    86157.05298561511
   ],
   "end_xy": [
    216733.57627307082,
    86152.11177174434
   ]
  },
  "min_10m": {
   "gradient_pct": -11.145185238653426,
   "start_distance_m": 613.0,
   "end_distance_m": 623.0,
   "midpoint_distance_m": 618.0,
   "start_elevation_m": 240.81178188475917,
   "end_elevation_m": 239.69726336089383,
   "start_xy": [
    216676.95042568975,
    86046.4152239031
   ],
   "end_xy": [
    216672.2395096197,
    86037.59438107134
   ]
  },
  "min_20m": {
   "gradient_pct": -9.16712847358852,
   "start_distance_m": 417.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 427.0,
   "start_elevation_m": 242.9872688093752,
   "end_elevation_m": 241.1538431146575,
   "start_xy": [
    216773.3041450909,
    86197.69457946718
   ],
   "end_xy": [
    216753.52870013996,
    86194.94681523321
   ]
  },
  "min_25m": {
   "gradient_pct": -8.913993264615328,
   "start_distance_m": 417.0,
   "end_distance_m": 442.0,
   "midpoint_distance_m": 429.5,
   "start_elevation_m": 242.9872688093752,
   "end_elevation_m": 240.75877049322136,
   "start_xy": [
    216773.3041450909,
    86197.69457946718
   ],
   "end_xy": [
    216748.88191641928,
    86193.10090113962
   ]
  },
  "min_50m": {
   "gradient_pct": -7.171000320930148,
   "start_distance_m": 405.0,
   "end_distance_m": 455.0,
   "midpoint_distance_m": 430.0,
   "start_elevation_m": 243.6961027215286,
   "end_elevation_m": 240.11060256106353,
   "start_xy": [
    216785.21658172624,
    86199.14158204524
   ],
   "end_xy": [
    216741.07795358766,
    86183.6516908591
   ]
  },
  "min_100m": {
   "gradient_pct": -5.103042891010261,
   "start_distance_m": 399.0,
   "end_distance_m": 499.0,
   "midpoint_distance_m": 449.0,
   "start_elevation_m": 243.84304170291915,
   "end_elevation_m": 238.7399988119089,
   "start_xy": [
    216791.17375868934,
    86199.85696549033
   ],
   "end_xy": [
    216734.39030402267,
    86141.21028346916
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.319531697131254,
   "start_distance_m": 220.0,
   "end_distance_m": 222.0,
   "midpoint_distance_m": 221.0,
   "start_elevation_m": 239.21918862715407,
   "end_elevation_m": 240.1055792610967,
   "start_xy": [
    216882.19760413072,
    86324.37532251856
   ],
   "end_xy": [
    216881.75973159418,
    86322.42384420149
   ]
  },
  "max_3m": {
   "gradient_pct": 40.533595436229085,
   "start_distance_m": 219.0,
   "end_distance_m": 222.0,
   "midpoint_distance_m": 220.5,
   "start_elevation_m": 238.88957139800982,
   "end_elevation_m": 240.1055792610967,
   "start_xy": [
    216882.41675678876,
    86325.35101310065
   ],
   "end_xy": [
    216881.75973159418,
    86322.42384420149
   ]
  }
 },
 "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": 0.069,
   "obstruction_max_height_m": 15.93,
   "flagged_windows_m": []
  },
  "review": [
   "short_window_divergence"
  ],
  "extent": []
 },
 "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/SX1585.tif"
  ],
  "calculated_at": "2026-08-19T18:16:01+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": [
   "SX1585.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.9% over 200 m (Terrain 50), gain 24.6 m over 671 m way. EXTENDED by graph walk: +0 segment(s) at base, +3 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 (50.6466, -4.5928)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.6466, -4.5928)'"
 },
 "area": {
  "place": "Tremail",
  "county": "Cornwall"
 }
}