{
 "ocl_version": "0.1.0",
 "name": "Merrymeet to Pengover Green",
 "slug": "discovered-lane-50-4601-4-4114",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.773498088596455,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1087.0,
   "end_distance_m": 1089.0,
   "start_elevation_m": 108.0136174376547,
   "end_elevation_m": 108.94908739942663,
   "min_gradient_pct": -52.60901947294769,
   "suppressed_max_gradient_pct": 54.3098839490078,
   "suppressed_location_m": [
    1534.0,
    1536.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.20592887980712,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1128.0,
   "end_distance_m": 1131.0,
   "start_elevation_m": 111.80108409922006,
   "end_elevation_m": 113.00726196561428,
   "min_gradient_pct": -40.238958566262305,
   "suppressed_max_gradient_pct": 48.32814985506909,
   "suppressed_location_m": [
    1534.0,
    1537.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.39329437429933,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1127.0,
   "end_distance_m": 1132.0,
   "start_elevation_m": 111.54793558648302,
   "end_elevation_m": 113.26760030519799,
   "min_gradient_pct": -25.96378042694738,
   "suppressed_max_gradient_pct": 35.262429261030945,
   "suppressed_location_m": [
    1532.0,
    1537.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.957977741258503,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 593.0,
   "end_distance_m": 603.0,
   "start_elevation_m": 118.58440573606765,
   "end_elevation_m": 121.2802035101935,
   "min_gradient_pct": -17.446352590429512
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.008850548583908,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 525.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 108.44421734425319,
   "end_elevation_m": 113.04598745396997,
   "min_gradient_pct": -15.54701511840399
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.759018991950317,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 530.0,
   "end_distance_m": 555.0,
   "start_elevation_m": 109.47257100800593,
   "end_elevation_m": 114.9123257559935,
   "min_gradient_pct": -15.053996535616875
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.738835520883782,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 526.0,
   "end_distance_m": 576.0,
   "start_elevation_m": 108.63091830572502,
   "end_elevation_m": 117.50033606616691,
   "min_gradient_pct": -14.24424791125236
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.992886288269219,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 517.0,
   "end_distance_m": 617.0,
   "start_elevation_m": 107.56200775617494,
   "end_elevation_m": 122.55489404444415,
   "min_gradient_pct": -12.934813777002406
  }
 ],
 "shape": {
  "ascent_concentration": 0.398,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 47.0,
  "shape_class": "sustained"
 },
 "length_m": 2318.209936883017,
 "start_elevation_m": 75.10010831994605,
 "end_elevation_m": 152.3479048338015,
 "endpoint_gain_m": 77.24779651385545,
 "overall_gradient_pct": 3.3322174702486222,
 "accumulated_ascent_m": 130.90874072190593,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.39329437429933,
   "start_distance_m": 1127.0,
   "end_distance_m": 1132.0,
   "midpoint_distance_m": 1129.5,
   "start_elevation_m": 111.54793558648302,
   "end_elevation_m": 113.26760030519799,
   "start_xy": [
    228849.0477704791,
    64766.01174305689
   ],
   "end_xy": [
    228849.2127503844,
    64761.014465635715
   ]
  },
  "max_10m": {
   "gradient_pct": 26.957977741258503,
   "start_distance_m": 593.0,
   "end_distance_m": 603.0,
   "midpoint_distance_m": 598.0,
   "start_elevation_m": 118.58440573606765,
   "end_elevation_m": 121.2802035101935,
   "start_xy": [
    229058.46482306815,
    65247.943812567224
   ],
   "end_xy": [
    229053.8996865974,
    65239.04665004745
   ]
  },
  "max_20m": {
   "gradient_pct": 23.008850548583908,
   "start_distance_m": 525.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 535.0,
   "start_elevation_m": 108.44421734425319,
   "end_elevation_m": 113.04598745396997,
   "start_xy": [
    229072.58827070956,
    65312.33352136753
   ],
   "end_xy": [
    229074.09229493912,
    65292.39015534356
   ]
  },
  "max_25m": {
   "gradient_pct": 21.759018991950317,
   "start_distance_m": 530.0,
   "end_distance_m": 555.0,
   "midpoint_distance_m": 542.5,
   "start_elevation_m": 109.47257100800593,
   "end_elevation_m": 114.9123257559935,
   "start_xy": [
    229072.9642588921,
    65307.34767846098
   ],
   "end_xy": [
    229073.82071944707,
    65282.49198847239
   ]
  },
  "max_50m": {
   "gradient_pct": 17.738835520883782,
   "start_distance_m": 526.0,
   "end_distance_m": 576.0,
   "midpoint_distance_m": 551.0,
   "start_elevation_m": 108.63091830572502,
   "end_elevation_m": 117.50033606616691,
   "start_xy": [
    229072.66328443834,
    65311.33633886643
   ],
   "end_xy": [
    229066.22583907392,
    65263.06884380657
   ]
  },
  "max_100m": {
   "gradient_pct": 14.992886288269219,
   "start_distance_m": 517.0,
   "end_distance_m": 617.0,
   "midpoint_distance_m": 567.0,
   "start_elevation_m": 107.56200775617494,
   "end_elevation_m": 122.55489404444415,
   "start_xy": [
    229070.74968969138,
    65320.11746768763
   ],
   "end_xy": [
    229047.50788558228,
    65226.59093457944
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -25.96378042694738,
   "start_distance_m": 1380.0,
   "end_distance_m": 1385.0,
   "midpoint_distance_m": 1382.5,
   "start_elevation_m": 114.29716886635056,
   "end_elevation_m": 112.99897984500319,
   "start_xy": [
    228804.86190312164,
    64519.03898262523
   ],
   "end_xy": [
    228804.89690226415,
    64514.039105120726
   ]
  },
  "min_10m": {
   "gradient_pct": -17.446352590429512,
   "start_distance_m": 1380.0,
   "end_distance_m": 1390.0,
   "midpoint_distance_m": 1385.0,
   "start_elevation_m": 114.29716886635056,
   "end_elevation_m": 112.55253360730761,
   "start_xy": [
    228804.86190312164,
    64519.03898262523
   ],
   "end_xy": [
    228804.93090145217,
    64509.03922111652
   ]
  },
  "min_20m": {
   "gradient_pct": -15.54701511840399,
   "start_distance_m": 999.0,
   "end_distance_m": 1019.0,
   "midpoint_distance_m": 1009.0,
   "start_elevation_m": 114.4385985451671,
   "end_elevation_m": 111.3291955214863,
   "start_xy": [
    228884.9031403916,
    64883.31468751717
   ],
   "end_xy": [
    228875.50742191717,
    64865.70946847215
   ]
  },
  "min_25m": {
   "gradient_pct": -15.053996535616875,
   "start_distance_m": 994.0,
   "end_distance_m": 1019.0,
   "midpoint_distance_m": 1006.5,
   "start_elevation_m": 115.09269465539052,
   "end_elevation_m": 111.3291955214863,
   "start_xy": [
    228887.0292999398,
    64887.840109283534
   ],
   "end_xy": [
    228875.50742191717,
    64865.70946847215
   ]
  },
  "min_50m": {
   "gradient_pct": -14.24424791125236,
   "start_distance_m": 974.0,
   "end_distance_m": 1024.0,
   "midpoint_distance_m": 999.0,
   "start_elevation_m": 117.81066567999274,
   "end_elevation_m": 110.68854172436656,
   "start_xy": [
    228895.53009937514,
    64905.94360007972
   ],
   "end_xy": [
    228872.76728067224,
    64861.5271695669
   ]
  },
  "min_100m": {
   "gradient_pct": -12.934813777002406,
   "start_distance_m": 959.0,
   "end_distance_m": 1059.0,
   "midpoint_distance_m": 1009.0,
   "start_elevation_m": 119.46996407571879,
   "end_elevation_m": 106.53515029871639,
   "start_xy": [
    228901.90623323538,
    64919.52096724243
   ],
   "end_xy": [
    228854.8663257443,
    64831.54177452366
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.773498088596455,
   "start_distance_m": 1087.0,
   "end_distance_m": 1089.0,
   "midpoint_distance_m": 1088.0,
   "start_elevation_m": 108.0136174376547,
   "end_elevation_m": 108.94908739942663,
   "start_xy": [
    228844.79989720095,
    64805.72456919429
   ],
   "end_xy": [
    228844.8518825144,
    64803.72524492668
   ]
  },
  "max_3m": {
   "gradient_pct": 40.20592887980712,
   "start_distance_m": 1128.0,
   "end_distance_m": 1131.0,
   "midpoint_distance_m": 1129.5,
   "start_elevation_m": 111.80108409922006,
   "end_elevation_m": 113.00726196561428,
   "start_xy": [
    228849.08075627746,
    64765.01228723646
   ],
   "end_xy": [
    228849.17976459194,
    64762.01392145634
   ]
  }
 },
 "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": 0.103,
   "obstruction_max_height_m": 11.07,
   "flagged_windows_m": [
    10
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    104.0,
    109.0
   ],
   [
    1533.0,
    1538.0
   ]
  ],
  "review": [],
  "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/SX2560.tif",
   "data/cache/england/bulk_dtm_1m/SX2565.tif"
  ],
  "calculated_at": "2026-08-19T18:12:21+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": [
   "SX2560.tif",
   "SX2565.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.1% over 200 m (Terrain 50), gain 48.7 m over 1620 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 (50.4601, -4.4114)'.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (50.4601, -4.4114)'"
 },
 "area": {
  "place": "Merrymeet",
  "county": "Cornwall"
 }
}