{
 "ocl_version": "0.1.0",
 "name": "Boode Road",
 "slug": "boode-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 40.152541826460464,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 617.0,
   "end_distance_m": 619.0,
   "start_elevation_m": 69.91884527510278,
   "end_elevation_m": 70.72189611163199,
   "min_gradient_pct": -26.449393585021852
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.58072640825338,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 616.0,
   "end_distance_m": 619.0,
   "start_elevation_m": 69.62447431938439,
   "end_elevation_m": 70.72189611163199,
   "min_gradient_pct": -22.37392258498403
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.708950297957813,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 585.0,
   "end_distance_m": 590.0,
   "start_elevation_m": 64.48387579850547,
   "end_elevation_m": 65.86932331340336,
   "min_gradient_pct": -18.777040610136737
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.951632760036887,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 546.0,
   "end_distance_m": 556.0,
   "start_elevation_m": 59.35353551846444,
   "end_elevation_m": 61.94869879446813,
   "min_gradient_pct": -15.197752988247828
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.676165689201824,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 536.0,
   "end_distance_m": 556.0,
   "start_elevation_m": 57.413465656627764,
   "end_elevation_m": 61.94869879446813,
   "min_gradient_pct": -14.265139792432038
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.840307407642285,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 533.0,
   "end_distance_m": 558.0,
   "start_elevation_m": 56.91517635767366,
   "end_elevation_m": 62.12525320958423,
   "min_gradient_pct": -14.185780709548085
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.83555917873923,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 944.0,
   "end_distance_m": 994.0,
   "start_elevation_m": 76.82054268724796,
   "end_elevation_m": 85.73832227661758,
   "min_gradient_pct": -13.585137651475819
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.912675006825637,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 894.0,
   "end_distance_m": 994.0,
   "start_elevation_m": 68.82564726979194,
   "end_elevation_m": 85.73832227661758,
   "min_gradient_pct": -11.33155815151951
  }
 ],
 "shape": {
  "ascent_concentration": 0.47,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 194.0,
  "shape_class": "stepped"
 },
 "length_m": 2398.8691544983635,
 "start_elevation_m": 29.3400687030793,
 "end_elevation_m": 124.23432277859543,
 "endpoint_gain_m": 94.89425407551613,
 "overall_gradient_pct": 3.955791165081691,
 "accumulated_ascent_m": 130.34336807688646,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.708950297957813,
   "start_distance_m": 585.0,
   "end_distance_m": 590.0,
   "midpoint_distance_m": 587.5,
   "start_elevation_m": 64.48387579850547,
   "end_elevation_m": 65.86932331340336,
   "start_xy": [
    249707.59639409656,
    137389.13211232552
   ],
   "end_xy": [
    249710.645398561,
    137393.09488468905
   ]
  },
  "max_10m": {
   "gradient_pct": 25.951632760036887,
   "start_distance_m": 546.0,
   "end_distance_m": 556.0,
   "midpoint_distance_m": 551.0,
   "start_elevation_m": 59.35353551846444,
   "end_elevation_m": 61.94869879446813,
   "start_xy": [
    249677.64734347272,
    137364.307107835
   ],
   "end_xy": [
    249685.53822801876,
    137370.44819197903
   ]
  },
  "max_20m": {
   "gradient_pct": 22.676165689201824,
   "start_distance_m": 536.0,
   "end_distance_m": 556.0,
   "midpoint_distance_m": 546.0,
   "start_elevation_m": 57.413465656627764,
   "end_elevation_m": 61.94869879446813,
   "start_xy": [
    249669.8310657594,
    137358.0696572482
   ],
   "end_xy": [
    249685.53822801876,
    137370.44819197903
   ]
  },
  "max_25m": {
   "gradient_pct": 20.840307407642285,
   "start_distance_m": 533.0,
   "end_distance_m": 558.0,
   "midpoint_distance_m": 545.5,
   "start_elevation_m": 56.91517635767366,
   "end_elevation_m": 62.12525320958423,
   "start_xy": [
    249667.48639834343,
    137356.1981516193
   ],
   "end_xy": [
    249687.13943710062,
    137371.64657782545
   ]
  },
  "max_50m": {
   "gradient_pct": 17.83555917873923,
   "start_distance_m": 944.0,
   "end_distance_m": 994.0,
   "midpoint_distance_m": 969.0,
   "start_elevation_m": 76.82054268724796,
   "end_elevation_m": 85.73832227661758,
   "start_xy": [
    249844.4302746878,
    137692.51594178675
   ],
   "end_xy": [
    249856.7478297399,
    137740.9482740983
   ]
  },
  "max_100m": {
   "gradient_pct": 16.912675006825637,
   "start_distance_m": 894.0,
   "end_distance_m": 994.0,
   "midpoint_distance_m": 944.0,
   "start_elevation_m": 68.82564726979194,
   "end_elevation_m": 85.73832227661758,
   "start_xy": [
    249829.1750500972,
    137644.93468496006
   ],
   "end_xy": [
    249856.7478297399,
    137740.9482740983
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.777040610136737,
   "start_distance_m": 1206.0,
   "end_distance_m": 1211.0,
   "midpoint_distance_m": 1208.5,
   "start_elevation_m": 100.61835196889656,
   "end_elevation_m": 99.67949993838972,
   "start_xy": [
    249995.55283312377,
    137876.0017341606
   ],
   "end_xy": [
    249995.5169187283,
    137881.0011059758
   ]
  },
  "min_10m": {
   "gradient_pct": -15.197752988247828,
   "start_distance_m": 734.0,
   "end_distance_m": 744.0,
   "midpoint_distance_m": 739.0,
   "start_elevation_m": 63.432526288725725,
   "end_elevation_m": 61.91275098990094,
   "start_xy": [
    249801.2945832442,
    137500.76404352544
   ],
   "end_xy": [
    249808.8066070787,
    137507.3645433095
   ]
  },
  "min_20m": {
   "gradient_pct": -14.265139792432038,
   "start_distance_m": 720.0,
   "end_distance_m": 740.0,
   "midpoint_distance_m": 730.0,
   "start_elevation_m": 65.31800533880316,
   "end_elevation_m": 62.46497738031675,
   "start_xy": [
    249790.75336976384,
    137491.55085697823
   ],
   "end_xy": [
    249805.8126442384,
    137504.71209682454
   ]
  },
  "min_25m": {
   "gradient_pct": -14.185780709548085,
   "start_distance_m": 720.0,
   "end_distance_m": 745.0,
   "midpoint_distance_m": 732.5,
   "start_elevation_m": 65.31800533880316,
   "end_elevation_m": 61.77156016141614,
   "start_xy": [
    249790.75336976384,
    137491.55085697823
   ],
   "end_xy": [
    249809.54929154683,
    137508.03418484033
   ]
  },
  "min_50m": {
   "gradient_pct": -13.585137651475819,
   "start_distance_m": 708.0,
   "end_distance_m": 758.0,
   "midpoint_distance_m": 733.0,
   "start_elevation_m": 66.90687205272727,
   "end_elevation_m": 60.11430322698936,
   "start_xy": [
    249781.69988813525,
    137483.67492363745
   ],
   "end_xy": [
    249819.28569195437,
    137516.64715394736
   ]
  },
  "min_100m": {
   "gradient_pct": -11.33155815151951,
   "start_distance_m": 679.0,
   "end_distance_m": 779.0,
   "midpoint_distance_m": 729.0,
   "start_elevation_m": 69.03350955708565,
   "end_elevation_m": 57.70195140556614,
   "start_xy": [
    249759.56252196012,
    137464.94161361238
   ],
   "end_xy": [
    249830.9123059756,
    137533.03224694871
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 40.152541826460464,
   "start_distance_m": 617.0,
   "end_distance_m": 619.0,
   "midpoint_distance_m": 618.0,
   "start_elevation_m": 69.91884527510278,
   "end_elevation_m": 70.72189611163199,
   "start_xy": [
    249721.74417025637,
    137417.57710892663
   ],
   "end_xy": [
    249722.41200282774,
    137419.46231430548
   ]
  },
  "max_3m": {
   "gradient_pct": 36.58072640825338,
   "start_distance_m": 616.0,
   "end_distance_m": 619.0,
   "midpoint_distance_m": 617.5,
   "start_elevation_m": 69.62447431938439,
   "end_elevation_m": 70.72189611163199,
   "start_xy": [
    249721.41022907497,
    137416.63451502306
   ],
   "end_xy": [
    249722.41200282774,
    137419.46231430548
   ]
  }
 },
 "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": 0.019,
   "obstruction_max_height_m": 6.26,
   "flagged_windows_m": [
    2,
    3
   ]
  },
  "review": [],
  "extent": [
   "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/SS4535.tif",
   "data/cache/england/bulk_dtm_1m/SS5035.tif"
  ],
  "calculated_at": "2026-08-19T18:05:28+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": [
   "SS4535.tif",
   "SS5035.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.7% over 200 m (Terrain 50), gain 81.8 m over 2013 m way. EXTENDED by graph walk: +3 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."
 },
 "area": {
  "place": "Braunton",
  "county": "Devon"
 }
}