{
 "ocl_version": "0.1.0",
 "name": "Margery Lane",
 "slug": "margery-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.54666790506434,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 238.0,
   "end_distance_m": 240.0,
   "start_elevation_m": 159.86228981624484,
   "end_elevation_m": 160.71322317434613,
   "min_gradient_pct": -14.806850227262203
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 35.82097863145369,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 213.0,
   "end_distance_m": 216.0,
   "start_elevation_m": 154.86545019807775,
   "end_elevation_m": 155.94007955702136,
   "min_gradient_pct": -10.057942818327584
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 35.245351310561546,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 212.0,
   "end_distance_m": 217.0,
   "start_elevation_m": 154.5183622461675,
   "end_elevation_m": 156.28062981169558,
   "min_gradient_pct": -5.552128130204892
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.724618235143794,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 209.0,
   "end_distance_m": 219.0,
   "start_elevation_m": 153.82663980260915,
   "end_elevation_m": 156.79910162612353,
   "min_gradient_pct": -0.5617986944909603
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.41935577088907,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 210.0,
   "end_distance_m": 230.0,
   "start_elevation_m": 154.05781743230958,
   "end_elevation_m": 159.1416885864874,
   "min_gradient_pct": 0.7096292625394085
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.17322670049998,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 208.0,
   "end_distance_m": 233.0,
   "start_elevation_m": 153.70809640862484,
   "end_elevation_m": 159.75140308374984,
   "min_gradient_pct": 0.9909233005147371
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.43963195846402,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 183.0,
   "end_distance_m": 233.0,
   "start_elevation_m": 150.03158710451783,
   "end_elevation_m": 159.75140308374984,
   "min_gradient_pct": 1.8346730286678508
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.189106110395556,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 240.0,
   "start_elevation_m": 144.52411706395057,
   "end_elevation_m": 160.71322317434613,
   "min_gradient_pct": 2.1004764052405847
  }
 ],
 "shape": {
  "ascent_concentration": 0.419,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 163.0,
  "shape_class": "sustained"
 },
 "length_m": 740.0000000000061,
 "start_elevation_m": 133.4036697416249,
 "end_elevation_m": 196.15154176980343,
 "endpoint_gain_m": 62.747872028178534,
 "overall_gradient_pct": 8.479442165970003,
 "accumulated_ascent_m": 63.73038260518797,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 35.245351310561546,
   "start_distance_m": 212.0,
   "end_distance_m": 217.0,
   "midpoint_distance_m": 214.5,
   "start_elevation_m": 154.5183622461675,
   "end_elevation_m": 156.28062981169558,
   "start_xy": [
    356689.331239711,
    208205.53109259586
   ],
   "end_xy": [
    356685.9293797439,
    208201.86675789993
   ]
  },
  "max_10m": {
   "gradient_pct": 29.724618235143794,
   "start_distance_m": 209.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 214.0,
   "start_elevation_m": 153.82663980260915,
   "end_elevation_m": 156.79910162612353,
   "start_xy": [
    356691.3723556913,
    208207.72969341345
   ],
   "end_xy": [
    356684.56863575696,
    208200.40102402156
   ]
  },
  "max_20m": {
   "gradient_pct": 25.41935577088907,
   "start_distance_m": 210.0,
   "end_distance_m": 230.0,
   "midpoint_distance_m": 220.0,
   "start_elevation_m": 154.05781743230958,
   "end_elevation_m": 159.1416885864874,
   "start_xy": [
    356690.6919836979,
    208206.99682647426
   ],
   "end_xy": [
    356676.64088111196,
    208192.81563278387
   ]
  },
  "max_25m": {
   "gradient_pct": 24.17322670049998,
   "start_distance_m": 208.0,
   "end_distance_m": 233.0,
   "midpoint_distance_m": 220.5,
   "start_elevation_m": 153.70809640862484,
   "end_elevation_m": 159.75140308374984,
   "start_xy": [
    356692.0527276847,
    208208.46256035264
   ],
   "end_xy": [
    356674.30377557944,
    208190.93469213363
   ]
  },
  "max_50m": {
   "gradient_pct": 19.43963195846402,
   "start_distance_m": 183.0,
   "end_distance_m": 233.0,
   "midpoint_distance_m": 208.0,
   "start_elevation_m": 150.03158710451783,
   "end_elevation_m": 159.75140308374984,
   "start_xy": [
    356709.06202752044,
    208226.78423383235
   ],
   "end_xy": [
    356674.30377557944,
    208190.93469213363
   ]
  },
  "max_100m": {
   "gradient_pct": 16.189106110395556,
   "start_distance_m": 140.0,
   "end_distance_m": 240.0,
   "midpoint_distance_m": 190.0,
   "start_elevation_m": 144.52411706395057,
   "end_elevation_m": 160.71322317434613,
   "start_xy": [
    356735.1677673105,
    208260.89136542834
   ],
   "end_xy": [
    356668.85052933684,
    208186.54583061635
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.552128130204892,
   "start_distance_m": 425.0,
   "end_distance_m": 430.0,
   "midpoint_distance_m": 427.5,
   "start_elevation_m": 178.62838578354382,
   "end_elevation_m": 178.35077937703358,
   "start_xy": [
    356566.15793399455,
    208035.56164818504
   ],
   "end_xy": [
    356563.0902155107,
    208031.61334433354
   ]
  },
  "min_10m": {
   "gradient_pct": -0.5617986944909603,
   "start_distance_m": 425.0,
   "end_distance_m": 435.0,
   "midpoint_distance_m": 430.0,
   "start_elevation_m": 178.62838578354382,
   "end_elevation_m": 178.57220591409472,
   "start_xy": [
    356566.15793399455,
    208035.56164818504
   ],
   "end_xy": [
    356560.283130387,
    208027.52396111254
   ]
  },
  "min_20m": {
   "gradient_pct": 0.7096292625394085,
   "start_distance_m": 720.0,
   "end_distance_m": 740.0,
   "midpoint_distance_m": 730.0,
   "start_elevation_m": 196.00961591729555,
   "end_elevation_m": 196.15154176980343,
   "start_xy": [
    356426.149779137,
    207783.7404774665
   ],
   "end_xy": [
    356421.847376481,
    207764.28731096323
   ]
  },
  "min_25m": {
   "gradient_pct": 0.9909233005147371,
   "start_distance_m": 681.0,
   "end_distance_m": 706.0,
   "midpoint_distance_m": 693.5,
   "start_elevation_m": 195.14388044721156,
   "end_elevation_m": 195.39161127234024,
   "start_xy": [
    356442.5234647614,
    207818.70378993466
   ],
   "end_xy": [
    356429.92014619376,
    207797.22321948202
   ]
  },
  "min_50m": {
   "gradient_pct": 1.8346730286678508,
   "start_distance_m": 690.0,
   "end_distance_m": 740.0,
   "midpoint_distance_m": 715.0,
   "start_elevation_m": 195.2342052554695,
   "end_elevation_m": 196.15154176980343,
   "start_xy": [
    356437.74305896426,
    207811.07832467576
   ],
   "end_xy": [
    356421.847376481,
    207764.28731096323
   ]
  },
  "min_100m": {
   "gradient_pct": 2.1004764052405847,
   "start_distance_m": 638.0,
   "end_distance_m": 738.0,
   "midpoint_distance_m": 688.0,
   "start_elevation_m": 194.03071047766332,
   "end_elevation_m": 196.1311868829039,
   "start_xy": [
    356473.0674674311,
    207848.68554316158
   ],
   "end_xy": [
    356422.00355985056,
    207766.2812033262
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.54666790506434,
   "start_distance_m": 238.0,
   "end_distance_m": 240.0,
   "midpoint_distance_m": 239.0,
   "start_elevation_m": 159.86228981624484,
   "end_elevation_m": 160.71322317434613,
   "start_xy": [
    356670.4085996919,
    208187.79979104985
   ],
   "end_xy": [
    356668.85052933684,
    208186.54583061635
   ]
  },
  "max_3m": {
   "gradient_pct": 35.82097863145369,
   "start_distance_m": 213.0,
   "end_distance_m": 216.0,
   "midpoint_distance_m": 214.5,
   "start_elevation_m": 154.86545019807775,
   "end_elevation_m": 155.94007955702136,
   "start_xy": [
    356688.6508677176,
    208204.79822565668
   ],
   "end_xy": [
    356686.60975173727,
    208202.59962483912
   ]
  }
 },
 "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": 0.023,
   "obstruction_max_height_m": 5.93,
   "flagged_windows_m": []
  },
  "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/SO5505.tif"
  ],
  "calculated_at": "2026-08-19T17:20:48+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": [
   "SO5505.tif"
  ],
  "route_summit_trim_m": 1139.0,
  "route_summit_trim_loss_m": 12.6,
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.7% over 200 m (Terrain 50), gain 45.6 m over 1794 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 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.",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Clearwell",
  "county": "Gloucestershire"
 }
}