{
 "ocl_version": "0.1.0",
 "name": "High Road",
 "slug": "high-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 47.28782200906494,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 470.0,
   "end_distance_m": 472.0,
   "start_elevation_m": 55.08280367422731,
   "end_elevation_m": 56.028560114408606,
   "min_gradient_pct": -45.97580846332221
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 42.024189849343685,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 486.0,
   "end_distance_m": 489.0,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 58.74854644113716,
   "min_gradient_pct": -37.4862786126504
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 37.67716678750645,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 486.0,
   "end_distance_m": 491.0,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 59.37167908503217,
   "min_gradient_pct": -27.82165300621685
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 27.926085801927485,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 486.0,
   "end_distance_m": 496.0,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 60.280429325849596,
   "min_gradient_pct": -15.894669488771811
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.11018323012874,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 485.0,
   "end_distance_m": 505.0,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 61.948095222432485,
   "min_gradient_pct": -11.76860944961966
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.477110856250594,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 485.0,
   "end_distance_m": 510.0,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 62.695336290469385,
   "min_gradient_pct": -10.724827251009458
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.325774886468366,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 470.0,
   "end_distance_m": 520.0,
   "start_elevation_m": 55.08280367422731,
   "end_elevation_m": 64.74569111746149,
   "min_gradient_pct": -6.88447637986708
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.548090548312572,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 485.0,
   "end_distance_m": 585.0,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 71.87414912471931,
   "min_gradient_pct": -1.278137755545437
  }
 ],
 "shape": {
  "ascent_concentration": 0.419,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 79.0,
  "shape_class": "sustained"
 },
 "length_m": 1014.8364070490389,
 "start_elevation_m": 28.94028325727833,
 "end_elevation_m": 94.18415222930957,
 "endpoint_gain_m": 65.24386897203124,
 "overall_gradient_pct": 6.429003583124163,
 "accumulated_ascent_m": 78.06977669271187,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 37.67716678750645,
   "start_distance_m": 486.0,
   "end_distance_m": 491.0,
   "midpoint_distance_m": 488.5,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 59.37167908503217,
   "start_xy": [
    251754.46681012312,
    49010.23019884821
   ],
   "end_xy": [
    251750.39273987515,
    49007.33158788661
   ]
  },
  "max_10m": {
   "gradient_pct": 27.926085801927485,
   "start_distance_m": 486.0,
   "end_distance_m": 496.0,
   "midpoint_distance_m": 491.0,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 60.280429325849596,
   "start_xy": [
    251754.46681012312,
    49010.23019884821
   ],
   "end_xy": [
    251746.50979196242,
    49004.18310840427
   ]
  },
  "max_20m": {
   "gradient_pct": 23.11018323012874,
   "start_distance_m": 485.0,
   "end_distance_m": 505.0,
   "midpoint_distance_m": 495.0,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 61.948095222432485,
   "start_xy": [
    251755.2818204077,
    49010.80964519812
   ],
   "end_xy": [
    251739.56467225647,
    48998.45900978643
   ]
  },
  "max_25m": {
   "gradient_pct": 21.477110856250594,
   "start_distance_m": 485.0,
   "end_distance_m": 510.0,
   "midpoint_distance_m": 497.5,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 62.695336290469385,
   "start_xy": [
    251755.2818204077,
    49010.80964519812
   ],
   "end_xy": [
    251735.7068986041,
    48995.27819625935
   ]
  },
  "max_50m": {
   "gradient_pct": 19.325774886468366,
   "start_distance_m": 470.0,
   "end_distance_m": 520.0,
   "midpoint_distance_m": 495.0,
   "start_elevation_m": 55.08280367422731,
   "end_elevation_m": 64.74569111746149,
   "start_xy": [
    251767.5045425588,
    49019.50476005418
   ],
   "end_xy": [
    251727.99019115823,
    48988.917974807555
   ]
  },
  "max_100m": {
   "gradient_pct": 14.548090548312572,
   "start_distance_m": 485.0,
   "end_distance_m": 585.0,
   "midpoint_distance_m": 535.0,
   "start_elevation_m": 57.32605857640674,
   "end_elevation_m": 71.87414912471931,
   "start_xy": [
    251755.2818204077,
    49010.80964519812
   ],
   "end_xy": [
    251679.89530144964,
    49001.741670415075
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -27.82165300621685,
   "start_distance_m": 334.0,
   "end_distance_m": 339.0,
   "midpoint_distance_m": 336.5,
   "start_elevation_m": 54.22380944488777,
   "end_elevation_m": 52.83272679457693,
   "start_xy": [
    251863.08554801674,
    49115.77843638685
   ],
   "end_xy": [
    251859.6686748234,
    49112.128097399225
   ]
  },
  "min_10m": {
   "gradient_pct": -15.894669488771811,
   "start_distance_m": 330.0,
   "end_distance_m": 340.0,
   "midpoint_distance_m": 335.0,
   "start_elevation_m": 54.41885181039448,
   "end_elevation_m": 52.8293848615173,
   "start_xy": [
    251865.81865365332,
    49118.69907480544
   ],
   "end_xy": [
    251858.9852294163,
    49111.398095862234
   ]
  },
  "min_20m": {
   "gradient_pct": -11.76860944961966,
   "start_distance_m": 334.0,
   "end_distance_m": 354.0,
   "midpoint_distance_m": 344.0,
   "start_elevation_m": 54.22380944488777,
   "end_elevation_m": 51.87008755496384,
   "start_xy": [
    251863.08554801674,
    49115.77843638685
   ],
   "end_xy": [
    251849.418876247,
    49101.176312368865
   ]
  },
  "min_25m": {
   "gradient_pct": -10.724827251009458,
   "start_distance_m": 330.0,
   "end_distance_m": 355.0,
   "midpoint_distance_m": 342.5,
   "start_elevation_m": 54.41885181039448,
   "end_elevation_m": 51.737644997642114,
   "start_xy": [
    251865.81865365332,
    49118.69907480544
   ],
   "end_xy": [
    251848.73543068295,
    49100.44631097885
   ]
  },
  "min_50m": {
   "gradient_pct": -6.88447637986708,
   "start_distance_m": 320.0,
   "end_distance_m": 370.0,
   "midpoint_distance_m": 345.0,
   "start_elevation_m": 55.02839720451945,
   "end_elevation_m": 51.58615901458591,
   "start_xy": [
    251872.88371742316,
    49125.72042747076
   ],
   "end_xy": [
    251838.48513323607,
    49089.49499306346
   ]
  },
  "min_100m": {
   "gradient_pct": -1.278137755545437,
   "start_distance_m": 308.0,
   "end_distance_m": 408.0,
   "midpoint_distance_m": 358.0,
   "start_elevation_m": 54.393044367310424,
   "end_elevation_m": 53.11490661176499,
   "start_xy": [
    251883.13299879298,
    49131.96159879666
   ],
   "end_xy": [
    251812.51826662087,
    49061.751135627
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 47.28782200906494,
   "start_distance_m": 470.0,
   "end_distance_m": 472.0,
   "midpoint_distance_m": 471.0,
   "start_elevation_m": 55.08280367422731,
   "end_elevation_m": 56.028560114408606,
   "start_xy": [
    251767.5045425588,
    49019.50476005418
   ],
   "end_xy": [
    251765.87472728963,
    49018.34557893004
   ]
  },
  "max_3m": {
   "gradient_pct": 42.024189849343685,
   "start_distance_m": 486.0,
   "end_distance_m": 489.0,
   "midpoint_distance_m": 487.5,
   "start_elevation_m": 57.48782074565685,
   "end_elevation_m": 58.74854644113716,
   "start_xy": [
    251754.46681012312,
    49010.23019884821
   ],
   "end_xy": [
    251752.02210186239,
    49008.491406108384
   ]
  }
 },
 "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": 0.07,
   "obstruction_max_height_m": 19.07,
   "flagged_windows_m": [
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.006,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    334.0,
    339.0
   ]
  ],
  "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/SX5045.tif"
  ],
  "calculated_at": "2026-08-19T18:36:29+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": [
   "SX5045.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.0% over 200 m (Terrain 50), gain 20.8 m over 382 m way. EXTENDED by graph walk: +2 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-50-3226-4-0854 ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Wembury",
  "county": "Devon"
 }
}