{
 "ocl_version": "0.1.0",
 "name": "Marsden Lane",
 "slug": "marsden-lane-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.84066928082308,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1364.0,
   "end_distance_m": 1366.0,
   "start_elevation_m": 253.7329233565118,
   "end_elevation_m": 254.44973674212827,
   "min_gradient_pct": -105.72937373313351,
   "suppressed_max_gradient_pct": 116.83649218226577,
   "suppressed_location_m": [
    0.0,
    2.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.12459273353545,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 860.0,
   "end_distance_m": 863.0,
   "start_elevation_m": 189.7699386999329,
   "end_elevation_m": 190.73367648193897,
   "min_gradient_pct": -93.91961289128119,
   "suppressed_max_gradient_pct": 86.81302361370437,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.181071705201248,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1060.0,
   "end_distance_m": 1065.0,
   "start_elevation_m": 227.12114804538805,
   "end_elevation_m": 228.38020163064812,
   "min_gradient_pct": -58.2963972657916,
   "suppressed_max_gradient_pct": 57.19743473081735,
   "suppressed_location_m": [
    71.0,
    76.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.898646645168867,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 1060.0,
   "end_distance_m": 1070.0,
   "start_elevation_m": 227.12114804538805,
   "end_elevation_m": 229.61101270990494,
   "min_gradient_pct": -28.484120219922318,
   "suppressed_max_gradient_pct": 31.809972279409067,
   "suppressed_location_m": [
    71.0,
    81.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.724368479829906,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1050.0,
   "end_distance_m": 1070.0,
   "start_elevation_m": 224.66613901393896,
   "end_elevation_m": 229.61101270990494,
   "min_gradient_pct": -13.095331396463905
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.673962353129014,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1046.0,
   "end_distance_m": 1071.0,
   "start_elevation_m": 223.68110927549645,
   "end_elevation_m": 229.8495998637787,
   "min_gradient_pct": -12.484739069821103
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 24.031838542489876,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1030.0,
   "end_distance_m": 1080.0,
   "start_elevation_m": 219.98703638149317,
   "end_elevation_m": 232.0029556527381,
   "min_gradient_pct": -11.747310260879829
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.358773239313933,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1000.0,
   "end_distance_m": 1100.0,
   "start_elevation_m": 213.92201549373186,
   "end_elevation_m": 236.2807887330458,
   "min_gradient_pct": -9.903138793494179
  }
 ],
 "shape": {
  "ascent_concentration": 0.395,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 },
 "length_m": 2062.159456907973,
 "start_elevation_m": 152.46732144817628,
 "end_elevation_m": 299.47141335497963,
 "endpoint_gain_m": 147.00409190680335,
 "overall_gradient_pct": 7.128648146696817,
 "accumulated_ascent_m": 180.00687357569362,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.181071705201248,
   "start_distance_m": 1060.0,
   "end_distance_m": 1065.0,
   "midpoint_distance_m": 1062.5,
   "start_elevation_m": 227.12114804538805,
   "end_elevation_m": 228.38020163064812,
   "start_xy": [
    405619.30324351194,
    412965.1032345537
   ],
   "end_xy": [
    405618.9268916813,
    412970.08905036456
   ]
  },
  "max_10m": {
   "gradient_pct": 24.898646645168867,
   "start_distance_m": 1060.0,
   "end_distance_m": 1070.0,
   "midpoint_distance_m": 1065.0,
   "start_elevation_m": 227.12114804538805,
   "end_elevation_m": 229.61101270990494,
   "start_xy": [
    405619.30324351194,
    412965.1032345537
   ],
   "end_xy": [
    405618.5505398506,
    412975.0748661754
   ]
  },
  "max_20m": {
   "gradient_pct": 24.724368479829906,
   "start_distance_m": 1050.0,
   "end_distance_m": 1070.0,
   "midpoint_distance_m": 1060.0,
   "start_elevation_m": 224.66613901393896,
   "end_elevation_m": 229.61101270990494,
   "start_xy": [
    405620.05594717327,
    412955.13160293206
   ],
   "end_xy": [
    405618.5505398506,
    412975.0748661754
   ]
  },
  "max_25m": {
   "gradient_pct": 24.673962353129014,
   "start_distance_m": 1046.0,
   "end_distance_m": 1071.0,
   "midpoint_distance_m": 1058.5,
   "start_elevation_m": 223.68110927549645,
   "end_elevation_m": 229.8495998637787,
   "start_xy": [
    405620.35702863784,
    412951.1429502834
   ],
   "end_xy": [
    405618.47555455397,
    412976.0720508097
   ]
  },
  "max_50m": {
   "gradient_pct": 24.031838542489876,
   "start_distance_m": 1030.0,
   "end_distance_m": 1080.0,
   "midpoint_distance_m": 1055.0,
   "start_elevation_m": 219.98703638149317,
   "end_elevation_m": 232.0029556527381,
   "start_xy": [
    405622.02024573047,
    412935.23085816304
   ],
   "end_xy": [
    405617.8010152207,
    412985.0467372492
   ]
  },
  "max_100m": {
   "gradient_pct": 22.358773239313933,
   "start_distance_m": 1000.0,
   "end_distance_m": 1100.0,
   "midpoint_distance_m": 1050.0,
   "start_elevation_m": 213.92201549373186,
   "end_elevation_m": 236.2807887330458,
   "start_xy": [
    405623.0703885424,
    412905.40567136725
   ],
   "end_xy": [
    405616.47420317534,
    413004.9898340727
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -58.2963972657916,
   "start_distance_m": 59.0,
   "end_distance_m": 64.0,
   "midpoint_distance_m": 61.5,
   "start_elevation_m": 156.03140763264472,
   "end_elevation_m": 153.11658776935514,
   "start_xy": [
    406402.91748544254,
    413122.1804637207
   ],
   "end_xy": [
    406401.07980400726,
    413126.8242243753
   ]
  },
  "min_10m": {
   "gradient_pct": -28.484120219922318,
   "start_distance_m": 58.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 63.0,
   "start_elevation_m": 156.03765244404912,
   "end_elevation_m": 153.18924042205688,
   "start_xy": [
    406403.2312292608,
    413121.2309560501
   ],
   "end_xy": [
    406399.4584275595,
    413130.48088110174
   ]
  },
  "min_20m": {
   "gradient_pct": -13.095331396463905,
   "start_distance_m": 51.0,
   "end_distance_m": 71.0,
   "midpoint_distance_m": 61.0,
   "start_elevation_m": 155.80709341658803,
   "end_elevation_m": 153.18802713729525,
   "start_xy": [
    406404.6054086187,
    413114.391848745
   ],
   "end_xy": [
    406398.2423952237,
    413133.2233736465
   ]
  },
  "min_25m": {
   "gradient_pct": -12.484739069821103,
   "start_distance_m": 536.0,
   "end_distance_m": 561.0,
   "midpoint_distance_m": 548.5,
   "start_elevation_m": 187.84219442231085,
   "end_elevation_m": 184.72100965485558,
   "start_xy": [
    405979.7701624721,
    413069.0307542752
   ],
   "end_xy": [
    405964.74549094855,
    413049.0492817167
   ]
  },
  "min_50m": {
   "gradient_pct": -11.747310260879829,
   "start_distance_m": 506.0,
   "end_distance_m": 556.0,
   "midpoint_distance_m": 531.0,
   "start_elevation_m": 191.2155260165892,
   "end_elevation_m": 185.34187088614928,
   "start_xy": [
    405997.9288390857,
    413092.8729134367
   ],
   "end_xy": [
    405967.75042525324,
    413053.04557622835
   ]
  },
  "min_100m": {
   "gradient_pct": -9.903138793494179,
   "start_distance_m": 498.0,
   "end_distance_m": 598.0,
   "midpoint_distance_m": 548.0,
   "start_elevation_m": 191.96395642081387,
   "end_elevation_m": 182.0608176273197,
   "start_xy": [
    406004.5524634244,
    413097.3592928923
   ],
   "end_xy": [
    405942.75728497666,
    413019.5078292908
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.84066928082308,
   "start_distance_m": 1364.0,
   "end_distance_m": 1366.0,
   "midpoint_distance_m": 1365.0,
   "start_elevation_m": 253.7329233565118,
   "end_elevation_m": 254.44973674212827,
   "start_xy": [
    405594.0756760504,
    413264.24371989595
   ],
   "end_xy": [
    405593.57427518547,
    413266.1798493267
   ]
  },
  "max_3m": {
   "gradient_pct": 32.12459273353545,
   "start_distance_m": 860.0,
   "end_distance_m": 863.0,
   "midpoint_distance_m": 861.5,
   "start_elevation_m": 189.7699386999329,
   "end_elevation_m": 190.73367648193897,
   "start_xy": [
    405721.8504132062,
    412893.535805571
   ],
   "end_xy": [
    405718.96252825245,
    412892.85631365556
   ]
  }
 },
 "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": 0.036,
   "obstruction_max_height_m": 8.3,
   "flagged_windows_m": [
    2,
    5,
    10
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.019,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    4.0
   ],
   [
    57.0,
    64.0
   ],
   [
    70.0,
    77.0
   ],
   [
    468.0,
    473.0
   ],
   [
    1352.0,
    1357.0
   ],
   [
    1416.0,
    1421.0
   ]
  ],
  "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/SE0510.tif"
  ],
  "calculated_at": "2026-08-15T19:11:39+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": [
   "SE0510.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.8% over 200 m (Terrain 50), gain 79.8 m over 866 m way. EXTENDED by graph walk: +7 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): marsden-lane"
 },
 "area": {
  "place": "Lingards Wood",
  "county": ""
 }
}