{
 "ocl_version": "0.1.0",
 "name": "Low Fremington to High Fremington",
 "slug": "discovered-lane-54-3877-1-9308",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.928675199721624,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 56.0,
   "end_distance_m": 58.0,
   "start_elevation_m": 186.86067414744542,
   "end_elevation_m": 187.51924765143985,
   "min_gradient_pct": -16.988451769964286,
   "suppressed_max_gradient_pct": 60.64915082750133,
   "suppressed_location_m": [
    337.0,
    339.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.247248847745368,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 55.0,
   "end_distance_m": 58.0,
   "start_elevation_m": 186.5818301860075,
   "end_elevation_m": 187.51924765143985,
   "min_gradient_pct": -14.643908285276552,
   "suppressed_max_gradient_pct": 51.31131299600327,
   "suppressed_location_m": [
    337.0,
    340.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.892287487001227,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 53.0,
   "end_distance_m": 58.0,
   "start_elevation_m": 185.9746332770898,
   "end_elevation_m": 187.51924765143985,
   "min_gradient_pct": -12.821851922886367
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.47207915064496,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 53.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 185.9746332770898,
   "end_elevation_m": 188.9218411921543,
   "min_gradient_pct": -11.28240643199149
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.681196529964723,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 43.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 183.78560188616134,
   "end_elevation_m": 188.9218411921543,
   "min_gradient_pct": -11.113782099742764
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.779679025426844,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 39.0,
   "end_distance_m": 64.0,
   "start_elevation_m": 182.94366432674724,
   "end_elevation_m": 189.13858408310395,
   "min_gradient_pct": -10.055016138986957
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.03423164299909,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 83.0,
   "end_distance_m": 133.0,
   "start_elevation_m": 191.41974076579982,
   "end_elevation_m": 201.43685658729936,
   "min_gradient_pct": -7.436288512042438
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.38654347352957,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 181.9217894644248,
   "end_elevation_m": 201.30833293795436,
   "min_gradient_pct": -6.107640045024766
  }
 ],
 "shape": {
  "ascent_concentration": 0.491,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 74.0,
  "shape_class": "stepped"
 },
 "length_m": 412.2050550922756,
 "start_elevation_m": 178.49357667438193,
 "end_elevation_m": 211.89841354431215,
 "endpoint_gain_m": 33.40483686993022,
 "overall_gradient_pct": 8.103936731792935,
 "accumulated_ascent_m": 40.49359582652676,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.892287487001227,
   "start_distance_m": 53.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 55.5,
   "start_elevation_m": 185.9746332770898,
   "end_elevation_m": 187.51924765143985,
   "start_xy": [
    404527.22646538966,
    499086.7585931715
   ],
   "end_xy": [
    404529.18911551655,
    499091.35728912574
   ]
  },
  "max_10m": {
   "gradient_pct": 29.47207915064496,
   "start_distance_m": 53.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 58.0,
   "start_elevation_m": 185.9746332770898,
   "end_elevation_m": 188.9218411921543,
   "start_xy": [
    404527.22646538966,
    499086.7585931715
   ],
   "end_xy": [
    404531.01724773715,
    499096.00764652266
   ]
  },
  "max_20m": {
   "gradient_pct": 25.681196529964723,
   "start_distance_m": 43.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 53.0,
   "start_elevation_m": 183.78560188616134,
   "end_elevation_m": 188.9218411921543,
   "start_xy": [
    404523.19527948654,
    499077.61100870115
   ],
   "end_xy": [
    404531.01724773715,
    499096.00764652266
   ]
  },
  "max_25m": {
   "gradient_pct": 24.779679025426844,
   "start_distance_m": 39.0,
   "end_distance_m": 64.0,
   "midpoint_distance_m": 51.5,
   "start_elevation_m": 182.94366432674724,
   "end_elevation_m": 189.13858408310395,
   "start_xy": [
    404521.36244758463,
    499074.05562866246
   ],
   "end_xy": [
    404531.34127144335,
    499096.95369548426
   ]
  },
  "max_50m": {
   "gradient_pct": 20.03423164299909,
   "start_distance_m": 83.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 108.0,
   "start_elevation_m": 191.41974076579982,
   "end_elevation_m": 201.43685658729936,
   "start_xy": [
    404537.50104677706,
    499114.92714981997
   ],
   "end_xy": [
    404575.97653613903,
    499141.43321263924
   ]
  },
  "max_100m": {
   "gradient_pct": 19.38654347352957,
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 181.9217894644248,
   "end_elevation_m": 201.30833293795436,
   "start_xy": [
    404518.1549917563,
    499067.8337135948
   ],
   "end_xy": [
    404574.97674711404,
    499141.41267230094
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.821851922886367,
   "start_distance_m": 264.0,
   "end_distance_m": 269.0,
   "midpoint_distance_m": 266.5,
   "start_elevation_m": 206.78831107819036,
   "end_elevation_m": 206.14721848204604,
   "start_xy": [
    404678.71083383524,
    499075.3903086716
   ],
   "end_xy": [
    404679.5097842133,
    499070.4632585441
   ]
  },
  "min_10m": {
   "gradient_pct": -11.28240643199149,
   "start_distance_m": 250.0,
   "end_distance_m": 260.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 208.25628682869643,
   "end_elevation_m": 207.12804618549728,
   "start_xy": [
    404677.8106742307,
    499089.3493840836
   ],
   "end_xy": [
    404678.2420310086,
    499079.3586918488
   ]
  },
  "min_20m": {
   "gradient_pct": -11.113782099742764,
   "start_distance_m": 250.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 260.0,
   "start_elevation_m": 208.25628682869643,
   "end_elevation_m": 206.03353040874788,
   "start_xy": [
    404677.8106742307,
    499089.3493840836
   ],
   "end_xy": [
    404679.8741162222,
    499069.53198941686
   ]
  },
  "min_25m": {
   "gradient_pct": -10.055016138986957,
   "start_distance_m": 250.0,
   "end_distance_m": 275.0,
   "midpoint_distance_m": 262.5,
   "start_elevation_m": 208.25628682869643,
   "end_elevation_m": 205.7425327939497,
   "start_xy": [
    404677.8106742307,
    499089.3493840836
   ],
   "end_xy": [
    404682.05916305305,
    499065.09046111867
   ]
  },
  "min_50m": {
   "gradient_pct": -7.436288512042438,
   "start_distance_m": 250.0,
   "end_distance_m": 300.0,
   "midpoint_distance_m": 275.0,
   "start_elevation_m": 208.25628682869643,
   "end_elevation_m": 204.5381425726752,
   "start_xy": [
    404677.8106742307,
    499089.3493840836
   ],
   "end_xy": [
    404700.5131391553,
    499048.3339091807
   ]
  },
  "min_100m": {
   "gradient_pct": -6.107640045024766,
   "start_distance_m": 237.0,
   "end_distance_m": 337.0,
   "midpoint_distance_m": 287.0,
   "start_elevation_m": 208.335140690882,
   "end_elevation_m": 202.22750064585725,
   "start_xy": [
    404665.04430984036,
    499090.8781183689
   ],
   "end_xy": [
    404728.9407010322,
    499025.12866899295
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.928675199721624,
   "start_distance_m": 56.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 57.0,
   "start_elevation_m": 186.86067414744542,
   "end_elevation_m": 187.51924765143985,
   "start_xy": [
    404528.4040554658,
    499089.517810744
   ],
   "end_xy": [
    404529.18911551655,
    499091.35728912574
   ]
  },
  "max_3m": {
   "gradient_pct": 31.247248847745368,
   "start_distance_m": 55.0,
   "end_distance_m": 58.0,
   "midpoint_distance_m": 56.5,
   "start_elevation_m": 186.5818301860075,
   "end_elevation_m": 187.51924765143985,
   "start_xy": [
    404528.01152544044,
    499088.59807155316
   ],
   "end_xy": [
    404529.18911551655,
    499091.35728912574
   ]
  }
 },
 "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": 0.027,
   "obstruction_max_height_m": 10.89,
   "flagged_windows_m": [
    5,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.015,
   "windows_resited": [
    2.0,
    3.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    336.0,
    341.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "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/SE0095.tif"
  ],
  "calculated_at": "2026-08-16T00:47:41+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.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": [
   "SE0095.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.2% over 200 m (Terrain 50), gain 22.7 m over 337 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (54.3877, -1.9308)'"
 },
 "area": {
  "place": "Grinton",
  "county": "North Yorkshire"
 }
}