{
 "ocl_version": "0.1.0",
 "name": "Smith's Lane",
 "slug": "smith-s-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 30.7977190262136,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 5653.0,
   "end_distance_m": 5655.0,
   "start_elevation_m": 304.21911236263884,
   "end_elevation_m": 304.8350667431631,
   "min_gradient_pct": -31.067792559593954
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.440257997259703,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 5652.0,
   "end_distance_m": 5655.0,
   "start_elevation_m": 304.0118590032453,
   "end_elevation_m": 304.8350667431631,
   "min_gradient_pct": -24.331173211180612
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.339249381328557,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 918.0,
   "end_distance_m": 923.0,
   "start_elevation_m": 121.20502422884212,
   "end_elevation_m": 122.47198669790855,
   "min_gradient_pct": -18.056161940942275
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.27726661912601,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "start_elevation_m": 120.04426003599595,
   "end_elevation_m": 122.47198669790855,
   "min_gradient_pct": -10.213293046870149
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.740952174767912,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 904.0,
   "end_distance_m": 924.0,
   "start_elevation_m": 118.13777310979702,
   "end_elevation_m": 122.6859635447506,
   "min_gradient_pct": -9.22650654164812
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.10704419053252,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 899.0,
   "end_distance_m": 924.0,
   "start_elevation_m": 117.15920249711748,
   "end_elevation_m": 122.6859635447506,
   "min_gradient_pct": -8.93906764108874
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.354661083443034,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 875.0,
   "end_distance_m": 925.0,
   "start_elevation_m": 112.70790574375768,
   "end_elevation_m": 122.8852362854792,
   "min_gradient_pct": -8.096516391347222
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.242583861260016,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 846.0,
   "end_distance_m": 946.0,
   "start_elevation_m": 107.03796270617279,
   "end_elevation_m": 126.28054656743281,
   "min_gradient_pct": -7.154503489067679
  }
 ],
 "shape": {
  "ascent_concentration": 0.607,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 290.0,
  "shape_class": "stepped"
 },
 "length_m": 7635.813353306869,
 "start_elevation_m": 42.57041669158922,
 "end_elevation_m": 322.92914911498906,
 "endpoint_gain_m": 280.35873242339983,
 "overall_gradient_pct": 3.6716289339626647,
 "accumulated_ascent_m": 321.8837197631144,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.339249381328557,
   "start_distance_m": 918.0,
   "end_distance_m": 923.0,
   "midpoint_distance_m": 920.5,
   "start_elevation_m": 121.20502422884212,
   "end_elevation_m": 122.47198669790855,
   "start_xy": [
    479196.7394841707,
    504599.0439605083
   ],
   "end_xy": [
    479193.9239544286,
    504594.9303934445
   ]
  },
  "max_10m": {
   "gradient_pct": 24.27726661912601,
   "start_distance_m": 913.0,
   "end_distance_m": 923.0,
   "midpoint_distance_m": 918.0,
   "start_elevation_m": 120.04426003599595,
   "end_elevation_m": 122.47198669790855,
   "start_xy": [
    479199.9426348563,
    504602.88320857077
   ],
   "end_xy": [
    479193.9239544286,
    504594.9303934445
   ]
  },
  "max_20m": {
   "gradient_pct": 22.740952174767912,
   "start_distance_m": 904.0,
   "end_distance_m": 924.0,
   "midpoint_distance_m": 914.0,
   "start_elevation_m": 118.13777310979702,
   "end_elevation_m": 122.6859635447506,
   "start_xy": [
    479206.34046915866,
    504609.0384325922
   ],
   "end_xy": [
    479193.4128834277,
    504594.070854945
   ]
  },
  "max_25m": {
   "gradient_pct": 22.10704419053252,
   "start_distance_m": 899.0,
   "end_distance_m": 924.0,
   "midpoint_distance_m": 911.5,
   "start_elevation_m": 117.15920249711748,
   "end_elevation_m": 122.6859635447506,
   "start_xy": [
    479211.0838684205,
    504610.49730502686
   ],
   "end_xy": [
    479193.4128834277,
    504594.070854945
   ]
  },
  "max_50m": {
   "gradient_pct": 20.354661083443034,
   "start_distance_m": 875.0,
   "end_distance_m": 925.0,
   "midpoint_distance_m": 900.0,
   "start_elevation_m": 112.70790574375768,
   "end_elevation_m": 122.8852362854792,
   "start_xy": [
    479228.61675596674,
    504597.53327759035
   ],
   "end_xy": [
    479192.90181242686,
    504593.2113164455
   ]
  },
  "max_100m": {
   "gradient_pct": 19.242583861260016,
   "start_distance_m": 846.0,
   "end_distance_m": 946.0,
   "midpoint_distance_m": 896.0,
   "start_elevation_m": 107.03796270617279,
   "end_elevation_m": 126.28054656743281,
   "start_xy": [
    479246.8470958953,
    504579.4872150327
   ],
   "end_xy": [
    479181.6718950389,
    504575.48293162585
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.056161940942275,
   "start_distance_m": 5662.0,
   "end_distance_m": 5667.0,
   "midpoint_distance_m": 5664.5,
   "start_elevation_m": 305.1428385848935,
   "end_elevation_m": 304.2400304878464,
   "start_xy": [
    475967.16167615267,
    501399.46699339245
   ],
   "end_xy": [
    475962.9273435326,
    501396.82600461406
   ]
  },
  "min_10m": {
   "gradient_pct": -10.213293046870149,
   "start_distance_m": 5658.0,
   "end_distance_m": 5668.0,
   "midpoint_distance_m": 5663.0,
   "start_elevation_m": 305.24525471357384,
   "end_elevation_m": 304.2239254088868,
   "start_xy": [
    475970.46427388286,
    501401.72372736724
   ],
   "end_xy": [
    475962.0339827824,
    501396.37666446465
   ]
  },
  "min_20m": {
   "gradient_pct": -9.22650654164812,
   "start_distance_m": 7597.0,
   "end_distance_m": 7617.0,
   "midpoint_distance_m": 7607.0,
   "start_elevation_m": 326.1310760759818,
   "end_elevation_m": 324.2857747676522,
   "start_xy": [
    474600.53735018766,
    500124.14654271834
   ],
   "end_xy": [
    474591.9968099995,
    500106.061765327
   ]
  },
  "min_25m": {
   "gradient_pct": -8.93906764108874,
   "start_distance_m": 7594.0,
   "end_distance_m": 7619.0,
   "midpoint_distance_m": 7606.5,
   "start_elevation_m": 326.3738730921494,
   "end_elevation_m": 324.1391061818772,
   "start_xy": [
    474601.8184312158,
    500126.85925932706
   ],
   "end_xy": [
    474591.1427559807,
    500104.25328758784
   ]
  },
  "min_50m": {
   "gradient_pct": -8.096516391347222,
   "start_distance_m": 7580.0,
   "end_distance_m": 7630.0,
   "midpoint_distance_m": 7605.0,
   "start_elevation_m": 327.3873773137857,
   "end_elevation_m": 323.3391191181121,
   "start_xy": [
    474607.7968093475,
    500139.518603501
   ],
   "end_xy": [
    474586.44545887725,
    500094.3066600226
   ]
  },
  "min_100m": {
   "gradient_pct": -7.154503489067679,
   "start_distance_m": 7535.0,
   "end_distance_m": 7635.0,
   "midpoint_distance_m": 7585.0,
   "start_elevation_m": 330.14317164679846,
   "end_elevation_m": 322.9886681577308,
   "start_xy": [
    474627.0130247708,
    500180.2093526316
   ],
   "end_xy": [
    474584.3103238302,
    500089.78546567477
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 30.7977190262136,
   "start_distance_m": 5653.0,
   "end_distance_m": 5655.0,
   "midpoint_distance_m": 5654.0,
   "start_elevation_m": 304.21911236263884,
   "end_elevation_m": 304.8350667431631,
   "start_xy": [
    475974.59252104553,
    501404.54464483564
   ],
   "end_xy": [
    475972.94122218044,
    501403.41627784824
   ]
  },
  "max_3m": {
   "gradient_pct": 27.440257997259703,
   "start_distance_m": 5652.0,
   "end_distance_m": 5655.0,
   "midpoint_distance_m": 5653.5,
   "start_elevation_m": 304.0118590032453,
   "end_elevation_m": 304.8350667431631,
   "start_xy": [
    475975.4181704781,
    501405.1088283293
   ],
   "end_xy": [
    475972.94122218044,
    501403.41627784824
   ]
  }
 },
 "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": 0.005,
   "obstruction_max_height_m": 8.4,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_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/NZ7000.tif",
   "data/cache/england/bulk_dtm_1m/NZ7500.tif",
   "data/cache/england/bulk_dtm_1m/NZ7505.tif"
  ],
  "calculated_at": "2026-08-16T01:25:30+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": [
   "NZ7000.tif",
   "NZ7500.tif",
   "NZ7505.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.4% over 200 m (Terrain 50), gain 180.0 m over 6571 m way. EXTENDED by graph walk: +10 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 2 overlapping proposal(s): delves-lane, delves-lane-2"
 },
 "area": {
  "place": "Delves",
  "county": "North Yorkshire"
 }
}