{
 "ocl_version": "0.1.0",
 "name": "Hedgend Road",
 "slug": "hedgend-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 42.95979578791673,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 625.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 156.9744275718112,
   "min_gradient_pct": -17.80073127333992,
   "suppressed_max_gradient_pct": 58.762530190593054,
   "suppressed_location_m": [
    1016.0,
    1018.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 38.85673365900667,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 625.0,
   "end_distance_m": 628.0,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 157.28093366582306,
   "min_gradient_pct": -14.575902046806277,
   "suppressed_max_gradient_pct": 52.92109250011663,
   "suppressed_location_m": [
    1015.0,
    1018.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.66684057481473,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "suppression_unstable"
   ],
   "start_distance_m": 625.0,
   "end_distance_m": 630.0,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 157.8485736847936,
   "min_gradient_pct": -12.596304103417992,
   "suppressed_max_gradient_pct": 45.286910006807375,
   "suppressed_location_m": [
    1014.0,
    1019.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.688743863534285,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 930.0,
   "end_distance_m": 940.0,
   "start_elevation_m": 188.74006270187317,
   "end_elevation_m": 191.3089370882266,
   "min_gradient_pct": -8.807423674129495,
   "suppressed_max_gradient_pct": 31.544876077210517,
   "suppressed_location_m": [
    1010.0,
    1020.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.675537819158848,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 926.0,
   "end_distance_m": 946.0,
   "start_elevation_m": 187.79290197047177,
   "end_elevation_m": 192.12800953430354,
   "min_gradient_pct": -3.8056288465709542,
   "suppressed_max_gradient_pct": 25.112746636101093,
   "suppressed_location_m": [
    889.0,
    909.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.772926303273607,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 929.0,
   "end_distance_m": 954.0,
   "start_elevation_m": 188.503535275126,
   "end_elevation_m": 193.9467668509444,
   "min_gradient_pct": -3.4548842006325913,
   "suppressed_max_gradient_pct": 23.639812448579164,
   "suppressed_location_m": [
    964.0,
    989.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.525496708691094,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 906.0,
   "end_distance_m": 956.0,
   "start_elevation_m": 186.53014257192262,
   "end_elevation_m": 194.29289092626817,
   "min_gradient_pct": -3.2123527991125798,
   "suppressed_max_gradient_pct": 20.943836649144085,
   "suppressed_location_m": [
    927.0,
    977.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.633212135870936,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "texture_excluded"
   ],
   "start_distance_m": 589.0,
   "end_distance_m": 689.0,
   "start_elevation_m": 151.9067956194711,
   "end_elevation_m": 165.54000775534203,
   "min_gradient_pct": -2.3033725221052634,
   "suppressed_max_gradient_pct": 19.4428546696395,
   "suppressed_location_m": [
    926.0,
    1026.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.399,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 218.0,
  "shape_class": "sustained"
 },
 "length_m": 1342.1644204398717,
 "start_elevation_m": 106.58674338554401,
 "end_elevation_m": 217.7076647768565,
 "endpoint_gain_m": 111.12092139131248,
 "overall_gradient_pct": 8.279233132621298,
 "accumulated_ascent_m": 118.08792835330769,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.66684057481473,
   "start_distance_m": 625.0,
   "end_distance_m": 630.0,
   "midpoint_distance_m": 627.5,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 157.8485736847936,
   "start_xy": [
    318988.3530042784,
    102631.42982674018
   ],
   "end_xy": [
    318993.2956756739,
    102632.18480974367
   ]
  },
  "max_10m": {
   "gradient_pct": 25.688743863534285,
   "start_distance_m": 930.0,
   "end_distance_m": 940.0,
   "midpoint_distance_m": 935.0,
   "start_elevation_m": 188.74006270187317,
   "end_elevation_m": 191.3089370882266,
   "start_xy": [
    319229.33685427124,
    102707.55609126798
   ],
   "end_xy": [
    319238.57803334144,
    102711.37716529916
   ]
  },
  "max_20m": {
   "gradient_pct": 21.675537819158848,
   "start_distance_m": 926.0,
   "end_distance_m": 946.0,
   "midpoint_distance_m": 936.0,
   "start_elevation_m": 187.79290197047177,
   "end_elevation_m": 192.12800953430354,
   "start_xy": [
    319225.6403908453,
    102706.02764183107
   ],
   "end_xy": [
    319243.9342015026,
    102714.07649165075
   ]
  },
  "max_25m": {
   "gradient_pct": 21.772926303273607,
   "start_distance_m": 929.0,
   "end_distance_m": 954.0,
   "midpoint_distance_m": 941.5,
   "start_elevation_m": 188.503535275126,
   "end_elevation_m": 193.9467668509444,
   "start_xy": [
    319228.41271564004,
    102707.17403395509
   ],
   "end_xy": [
    319251.0281988021,
    102717.77449024415
   ]
  },
  "max_50m": {
   "gradient_pct": 15.525496708691094,
   "start_distance_m": 906.0,
   "end_distance_m": 956.0,
   "midpoint_distance_m": 931.0,
   "start_elevation_m": 186.53014257192262,
   "end_elevation_m": 194.29289092626817,
   "start_xy": [
    319207.1581491742,
    102698.38521318673
   ],
   "end_xy": [
    319252.8014799716,
    102718.6994082922
   ]
  },
  "max_100m": {
   "gradient_pct": 13.633212135870936,
   "start_distance_m": 589.0,
   "end_distance_m": 689.0,
   "midpoint_distance_m": 639.0,
   "start_elevation_m": 151.9067956194711,
   "end_elevation_m": 165.54000775534203,
   "start_xy": [
    318953.03971748066,
    102631.98802086404
   ],
   "end_xy": [
    319049.8883343655,
    102648.3647769361
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.596304103417992,
   "start_distance_m": 773.0,
   "end_distance_m": 778.0,
   "midpoint_distance_m": 775.5,
   "start_elevation_m": 173.81850044361684,
   "end_elevation_m": 173.18868523844594,
   "start_xy": [
    319107.5996840627,
    102621.0477458424
   ],
   "end_xy": [
    319110.2210488207,
    102625.30549637183
   ]
  },
  "min_10m": {
   "gradient_pct": -8.807423674129495,
   "start_distance_m": 768.0,
   "end_distance_m": 778.0,
   "midpoint_distance_m": 773.0,
   "start_elevation_m": 174.0694276058589,
   "end_elevation_m": 173.18868523844594,
   "start_xy": [
    319104.97869518073,
    102616.78976391983
   ],
   "end_xy": [
    319110.2210488207,
    102625.30549637183
   ]
  },
  "min_20m": {
   "gradient_pct": -3.8056288465709542,
   "start_distance_m": 1316.0,
   "end_distance_m": 1336.0,
   "midpoint_distance_m": 1326.0,
   "start_elevation_m": 218.63980708714737,
   "end_elevation_m": 217.87868131783318,
   "start_xy": [
    319552.7248239869,
    102726.00317162345
   ],
   "end_xy": [
    319568.88513263286,
    102714.21994663273
   ]
  },
  "min_25m": {
   "gradient_pct": -3.4548842006325913,
   "start_distance_m": 1307.0,
   "end_distance_m": 1332.0,
   "midpoint_distance_m": 1319.5,
   "start_elevation_m": 218.79878019814086,
   "end_elevation_m": 217.9350591479827,
   "start_xy": [
    319545.4521715433,
    102731.30491826854
   ],
   "end_xy": [
    319565.65278513683,
    102716.57619994358
   ]
  },
  "min_50m": {
   "gradient_pct": -3.2123527991125798,
   "start_distance_m": 1284.0,
   "end_distance_m": 1334.0,
   "midpoint_distance_m": 1309.0,
   "start_elevation_m": 219.50722653238842,
   "end_elevation_m": 217.90105013283213,
   "start_xy": [
    319526.8677762958,
    102744.85557176419
   ],
   "end_xy": [
    319567.2689588848,
    102715.39807328816
   ]
  },
  "min_100m": {
   "gradient_pct": -2.3033725221052634,
   "start_distance_m": 1242.0,
   "end_distance_m": 1342.0,
   "midpoint_distance_m": 1292.0,
   "start_elevation_m": 220.0211372609228,
   "end_elevation_m": 217.71776473881755,
   "start_xy": [
    319492.73439503164,
    102769.3255345377
   ],
   "end_xy": [
    319573.73314296716,
    102710.68486635057
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 42.95979578791673,
   "start_distance_m": 625.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 626.0,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 156.9744275718112,
   "start_xy": [
    318988.3530042784,
    102631.42982674018
   ],
   "end_xy": [
    318990.33007025917,
    102631.73183681408
   ]
  },
  "max_3m": {
   "gradient_pct": 38.85673365900667,
   "start_distance_m": 625.0,
   "end_distance_m": 628.0,
   "midpoint_distance_m": 626.5,
   "start_elevation_m": 156.11523165605286,
   "end_elevation_m": 157.28093366582306,
   "start_xy": [
    318988.3530042784,
    102631.42982674018
   ],
   "end_xy": [
    318991.31860969454,
    102631.8827996598
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.009,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    100.0
   ],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.055,
   "windows_resited": [],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "texture_suppression": {
   "masked_fraction": 0.063,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 5.0,
     "start_m": 964.0,
     "end_m": 969.0,
     "raw_pct": 38.25,
     "reason": "short-step"
    }
   ],
   "advisory": [],
   "unresolved": [],
   "unstable": [
    {
     "window_m": 5.0,
     "start_m": 625.0,
     "end_m": 630.0,
     "raw_pct": 34.67,
     "reason": "hump+short-step",
     "perturbations": [
      "phase+0.000/mask+0",
      "phase+0.333/mask+1",
      "phase+0.667/mask-1"
     ],
     "perturbation_reasons": [
      "hump+short-step",
      "",
      ""
     ]
    }
   ]
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.121,
   "obstruction_max_height_m": 20.22,
   "flagged_windows_m": [
    10,
    20,
    25,
    50
   ]
  },
  "excluded_ranges_m": [
   [
    900.0,
    905.0
   ],
   [
    962.0,
    971.0
   ],
   [
    1015.0,
    1020.0
   ],
   [
    1030.0,
    1060.0
   ],
   [
    1080.0,
    1110.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "extent": [
   "descends_at_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "cd1381c557ec0196a6c481fc125290b249b285c2",
   "code_git_dirty": "true",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:faa4beed0662d2f6",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "remeasure-260920-uk",
   "road_pbf": "batch-england-chunk032.pbf",
   "region_key": "england",
   "crs": "EPSG:27700",
   "elevation_provider_key": "england",
   "authority": "os-open-roads",
   "registry_pbf": "england-2026-08-27.osm.pbf"
  },
  "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/dtm_1m/E318000_N102000_2000m.tif"
  ],
  "calculated_at": "2026-09-21T01:59:39+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/remeasure-260920/uk/batch-england-chunk032.pbf",
  "osm_snapshot": "",
  "run_id": "remeasure-260920-uk",
  "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": [
   "E318000_N102000_2000m.tif"
  ],
  "climb_origin": "discovered",
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "suppression_unstable": [
   5.0
  ],
  "carriageway": {
   "stations": 60,
   "stations_resolved": 60,
   "width_median_m": 6.25,
   "width_p10_m": 3.2,
   "width_min_m": 1.5,
   "width_max_m": 12.0,
   "bounded_share": 0.15,
   "unbounded_share": 0.85,
   "confidence_median": 0.0,
   "width_median_bounded_m": 3.75,
   "window_m": [
    929.0,
    954.0
   ],
   "width_at_max25_m": 3.75,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 60,
    "stations_resolved": 60,
    "width_median_m": 3.88,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.883,
    "unbounded_share": 0.117,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.75,
    "window_m": [
     929.0,
     954.0
    ],
    "width_at_max25_m": 2.75,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "remeasured": {
   "on": "2026-09-21",
   "why": "corpus re-measure 2026-09-21: a mask that exists today reaching a page published before it did; fallers only (Peter: fold the fallers)",
   "published_max25_pct": 23.67,
   "max25_pct": 21.77
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Monkton",
  "county": "Devon"
 }
}