{
 "ocl_version": "0.1.0",
 "name": "St Johns Lane",
 "slug": "st-johns-lane",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 50.926891180380096,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 686.0,
   "end_distance_m": 688.0,
   "start_elevation_m": 73.05878284855648,
   "end_elevation_m": 74.07732067216408,
   "min_gradient_pct": -6.7132339624501824
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.66296660832395,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 685.0,
   "end_distance_m": 688.0,
   "start_elevation_m": 72.76743167391436,
   "end_elevation_m": 74.07732067216408,
   "min_gradient_pct": -5.829346666816093
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.81315247711149,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 744.0,
   "end_distance_m": 749.0,
   "start_elevation_m": 82.52289371223098,
   "end_elevation_m": 84.41355133608656,
   "min_gradient_pct": -5.5610083177344904
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.544212833911843,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 776.0,
   "end_distance_m": 786.0,
   "start_elevation_m": 88.34306688099423,
   "end_elevation_m": 91.29748816438541,
   "min_gradient_pct": -4.728129699067125
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.74847361962435,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 779.0,
   "end_distance_m": 799.0,
   "start_elevation_m": 89.00060921036783,
   "end_elevation_m": 94.3503039342927,
   "min_gradient_pct": -2.8780685792010274
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.323616567159434,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 776.0,
   "end_distance_m": 801.0,
   "start_elevation_m": 88.34306688099423,
   "end_elevation_m": 94.67397102278409,
   "min_gradient_pct": -2.585341285009065
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.927786122592465,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 744.0,
   "end_distance_m": 794.0,
   "start_elevation_m": 82.52289371223098,
   "end_elevation_m": 92.98678677352721,
   "min_gradient_pct": -1.4835312655607993
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.944397851198246,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "start_elevation_m": 76.97764169969514,
   "end_elevation_m": 95.92203955089339,
   "min_gradient_pct": -0.98650356569064,
   "suppressed_max_gradient_pct": 19.48808420344382,
   "suppressed_location_m": [
    702.0,
    802.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.423,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 93.0,
  "shape_class": "sustained"
 },
 "length_m": 1138.9301185478005,
 "start_elevation_m": 3.1981923491043203,
 "end_elevation_m": 108.8869480697631,
 "endpoint_gain_m": 105.68875572065878,
 "overall_gradient_pct": 9.279652368436603,
 "accumulated_ascent_m": 109.21819685596759,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.81315247711149,
   "start_distance_m": 744.0,
   "end_distance_m": 749.0,
   "midpoint_distance_m": 746.5,
   "start_elevation_m": 82.52289371223098,
   "end_elevation_m": 84.41355133608656,
   "start_xy": [
    240983.0670003055,
    53198.38310633088
   ],
   "end_xy": [
    240980.44641156378,
    53194.12487728037
   ]
  },
  "max_10m": {
   "gradient_pct": 29.544212833911843,
   "start_distance_m": 776.0,
   "end_distance_m": 786.0,
   "midpoint_distance_m": 781.0,
   "start_elevation_m": 88.34306688099423,
   "end_elevation_m": 91.29748816438541,
   "start_xy": [
    240966.29523235836,
    53171.13044040758
   ],
   "end_xy": [
    240961.0540548749,
    53162.61398230654
   ]
  },
  "max_20m": {
   "gradient_pct": 26.74847361962435,
   "start_distance_m": 779.0,
   "end_distance_m": 799.0,
   "midpoint_distance_m": 789.0,
   "start_elevation_m": 89.00060921036783,
   "end_elevation_m": 94.3503039342927,
   "start_xy": [
    240964.72287911334,
    53168.57550297726
   ],
   "end_xy": [
    240953.4371326993,
    53152.10872546345
   ]
  },
  "max_25m": {
   "gradient_pct": 25.323616567159434,
   "start_distance_m": 776.0,
   "end_distance_m": 801.0,
   "midpoint_distance_m": 788.5,
   "start_elevation_m": 88.34306688099423,
   "end_elevation_m": 94.67397102278409,
   "start_xy": [
    240966.29523235836,
    53171.13044040758
   ],
   "end_xy": [
    240952.18570059526,
    53150.548623643364
   ]
  },
  "max_50m": {
   "gradient_pct": 20.927786122592465,
   "start_distance_m": 744.0,
   "end_distance_m": 794.0,
   "midpoint_distance_m": 769.0,
   "start_elevation_m": 82.52289371223098,
   "end_elevation_m": 92.98678677352721,
   "start_xy": [
    240983.0670003055,
    53198.38310633088
   ],
   "end_xy": [
    240956.56571295933,
    53156.00898001367
   ]
  },
  "max_100m": {
   "gradient_pct": 18.944397851198246,
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 76.97764169969514,
   "end_elevation_m": 95.92203955089339,
   "start_xy": [
    241010.8225314514,
    53214.83711348867
   ],
   "end_xy": [
    240946.55425612722,
    53143.52816545296
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.5610083177344904,
   "start_distance_m": 1128.0,
   "end_distance_m": 1133.0,
   "midpoint_distance_m": 1130.5,
   "start_elevation_m": 109.09448177793469,
   "end_elevation_m": 108.81643136204796,
   "start_xy": [
    240725.77767864766,
    52915.29121248233
   ],
   "end_xy": [
    240722.5303768839,
    52911.489235200024
   ]
  },
  "min_10m": {
   "gradient_pct": -4.728129699067125,
   "start_distance_m": 1124.0,
   "end_distance_m": 1134.0,
   "midpoint_distance_m": 1129.0,
   "start_elevation_m": 109.24494442021866,
   "end_elevation_m": 108.77213145031195,
   "start_xy": [
    240728.37552005865,
    52918.33279430817
   ],
   "end_xy": [
    240721.88091653117,
    52910.72883974356
   ]
  },
  "min_20m": {
   "gradient_pct": -2.8780685792010274,
   "start_distance_m": 1114.0,
   "end_distance_m": 1134.0,
   "midpoint_distance_m": 1124.0,
   "start_elevation_m": 109.34774516615215,
   "end_elevation_m": 108.77213145031195,
   "start_xy": [
    240734.87012358615,
    52925.93674887277
   ],
   "end_xy": [
    240721.88091653117,
    52910.72883974356
   ]
  },
  "min_25m": {
   "gradient_pct": -2.585341285009065,
   "start_distance_m": 1109.0,
   "end_distance_m": 1134.0,
   "midpoint_distance_m": 1121.5,
   "start_elevation_m": 109.41846677156421,
   "end_elevation_m": 108.77213145031195,
   "start_xy": [
    240738.426501356,
    52929.44795001687
   ],
   "end_xy": [
    240721.88091653117,
    52910.72883974356
   ]
  },
  "min_50m": {
   "gradient_pct": -1.4835312655607993,
   "start_distance_m": 1085.0,
   "end_distance_m": 1135.0,
   "midpoint_distance_m": 1110.0,
   "start_elevation_m": 109.51442990846532,
   "end_elevation_m": 108.77266427568492,
   "start_xy": [
    240755.6919013202,
    52946.118461828904
   ],
   "end_xy": [
    240721.23145617842,
    52909.9684442871
   ]
  },
  "min_100m": {
   "gradient_pct": -0.98650356569064,
   "start_distance_m": 1034.0,
   "end_distance_m": 1134.0,
   "midpoint_distance_m": 1084.0,
   "start_elevation_m": 109.75863501600259,
   "end_elevation_m": 108.77213145031195,
   "start_xy": [
    240792.3808762442,
    52981.54329942948
   ],
   "end_xy": [
    240721.88091653117,
    52910.72883974356
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 50.926891180380096,
   "start_distance_m": 686.0,
   "end_distance_m": 688.0,
   "midpoint_distance_m": 687.0,
   "start_elevation_m": 73.05878284855648,
   "end_elevation_m": 74.07732067216408,
   "start_xy": [
    241033.5745145665,
    53222.475651590335
   ],
   "end_xy": [
    241031.6785159736,
    53221.83910674853
   ]
  },
  "max_3m": {
   "gradient_pct": 43.66296660832395,
   "start_distance_m": 685.0,
   "end_distance_m": 688.0,
   "midpoint_distance_m": 686.5,
   "start_elevation_m": 72.76743167391436,
   "end_elevation_m": 74.07732067216408,
   "start_xy": [
    241034.52251386296,
    53222.79392401124
   ],
   "end_xy": [
    241031.6785159736,
    53221.83910674853
   ]
  }
 },
 "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": 0.073,
   "obstruction_max_height_m": 10.32,
   "flagged_windows_m": [
    2,
    3,
    5,
    10
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    703.0,
    708.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/SX4050.tif"
  ],
  "calculated_at": "2026-08-15T01:08:43+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": [
   "SX4050.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.5% over 200 m (Terrain 50), gain 24.6 m over 220 m way. EXTENDED by graph walk: +5 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): discovered-lane-50-3565-4-2375"
 },
 "area": {
  "place": "St John",
  "county": "Cornwall"
 }
}