{
 "ocl_version": "0.1.0",
 "name": "Iford Hill",
 "slug": "iford-hill",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.929661329461425,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 68.11935895131299,
   "end_elevation_m": 68.79795217790222,
   "min_gradient_pct": -62.85759536470117,
   "suppressed_max_gradient_pct": 104.56712872600065,
   "suppressed_location_m": [
    15.0,
    17.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.19454874811163,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 311.0,
   "end_distance_m": 314.0,
   "start_elevation_m": 67.83211571545887,
   "end_elevation_m": 68.79795217790222,
   "min_gradient_pct": -43.94285817838769,
   "suppressed_max_gradient_pct": 90.41651125072315,
   "suppressed_location_m": [
    14.0,
    17.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.098270104276992,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "start_elevation_m": 36.09936561935024,
   "end_elevation_m": 37.60427912456409,
   "min_gradient_pct": -28.48172986433816,
   "suppressed_max_gradient_pct": 67.60674874841541,
   "suppressed_location_m": [
    280.0,
    285.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.943710200332276,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 260.0,
   "end_distance_m": 270.0,
   "start_elevation_m": 59.27974762947285,
   "end_elevation_m": 61.77411864950608,
   "min_gradient_pct": -15.144296344195283,
   "suppressed_max_gradient_pct": 46.29636165029055,
   "suppressed_location_m": [
    278.0,
    288.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.47493858589118,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 250.0,
   "end_distance_m": 270.0,
   "start_elevation_m": 57.07913093232784,
   "end_elevation_m": 61.77411864950608,
   "min_gradient_pct": -1.0651722004361908,
   "suppressed_max_gradient_pct": 28.986077067289706,
   "suppressed_location_m": [
    267.0,
    287.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.78390113078649,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 246.0,
   "end_distance_m": 271.0,
   "start_elevation_m": 56.27834387173811,
   "end_elevation_m": 61.97431915443473,
   "min_gradient_pct": -0.9225801653381893,
   "suppressed_max_gradient_pct": 28.060556011029036,
   "suppressed_location_m": [
    262.0,
    287.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.560014167168333,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 219.0,
   "end_distance_m": 269.0,
   "start_elevation_m": 50.708351613384856,
   "end_elevation_m": 61.48835869696902,
   "min_gradient_pct": 0.018935403231289172,
   "suppressed_max_gradient_pct": 24.409023104521285,
   "suppressed_location_m": [
    237.0,
    287.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.432275548411965,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 173.0,
   "end_distance_m": 273.0,
   "start_elevation_m": 42.83079754638033,
   "end_elevation_m": 62.2630730947923,
   "min_gradient_pct": 3.7740604552832053,
   "suppressed_max_gradient_pct": 21.691408607562327,
   "suppressed_location_m": [
    187.0,
    287.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.465,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 123.0,
  "shape_class": "stepped"
 },
 "length_m": 462.7758696382341,
 "start_elevation_m": 30.214351767344862,
 "end_elevation_m": 76.84594064966619,
 "endpoint_gain_m": 46.631588882321324,
 "overall_gradient_pct": 10.076495327808393,
 "accumulated_ascent_m": 52.31167605398472,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.098270104276992,
   "start_distance_m": 116.0,
   "end_distance_m": 121.0,
   "midpoint_distance_m": 118.5,
   "start_elevation_m": 36.09936561935024,
   "end_elevation_m": 37.60427912456409,
   "start_xy": [
    380116.3926114203,
    158893.71966896468
   ],
   "end_xy": [
    380120.695677842,
    158891.17337374014
   ]
  },
  "max_10m": {
   "gradient_pct": 24.943710200332276,
   "start_distance_m": 260.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 265.0,
   "start_elevation_m": 59.27974762947285,
   "end_elevation_m": 61.77411864950608,
   "start_xy": [
    380224.9573176412,
    158860.6593710472
   ],
   "end_xy": [
    380230.6417381816,
    158868.87722514838
   ]
  },
  "max_20m": {
   "gradient_pct": 23.47493858589118,
   "start_distance_m": 250.0,
   "end_distance_m": 270.0,
   "midpoint_distance_m": 260.0,
   "start_elevation_m": 57.07913093232784,
   "end_elevation_m": 61.77411864950608,
   "start_xy": [
    380220.44956740824,
    158851.73299508393
   ],
   "end_xy": [
    380230.6417381816,
    158868.87722514838
   ]
  },
  "max_25m": {
   "gradient_pct": 22.78390113078649,
   "start_distance_m": 246.0,
   "end_distance_m": 271.0,
   "midpoint_distance_m": 258.5,
   "start_elevation_m": 56.27834387173811,
   "end_elevation_m": 61.97431915443473,
   "start_xy": [
    380218.59536744613,
    158848.1933192562
   ],
   "end_xy": [
    380231.21980020887,
    158869.69321797468
   ]
  },
  "max_50m": {
   "gradient_pct": 21.560014167168333,
   "start_distance_m": 219.0,
   "end_distance_m": 269.0,
   "midpoint_distance_m": 244.0,
   "start_elevation_m": 50.708351613384856,
   "end_elevation_m": 61.48835869696902,
   "start_xy": [
    380197.32091466646,
    158833.96506222268
   ],
   "end_xy": [
    380230.06367615424,
    158868.06123232207
   ]
  },
  "max_100m": {
   "gradient_pct": 19.432275548411965,
   "start_distance_m": 173.0,
   "end_distance_m": 273.0,
   "midpoint_distance_m": 223.0,
   "start_elevation_m": 42.83079754638033,
   "end_elevation_m": 62.2630730947923,
   "start_xy": [
    380160.1123474836,
    158857.44270396087
   ],
   "end_xy": [
    380232.3759242635,
    158871.32520362726
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -28.48172986433816,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 30.214351767344862,
   "end_elevation_m": 28.790265274127954,
   "start_xy": [
    380018.387,
    158889.335
   ],
   "end_xy": [
    380020.37051121716,
    158893.92473673006
   ]
  },
  "min_10m": {
   "gradient_pct": -15.144296344195283,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 30.214351767344862,
   "end_elevation_m": 28.699922132925334,
   "start_xy": [
    380018.387,
    158889.335
   ],
   "end_xy": [
    380022.35402243433,
    158898.51447346012
   ]
  },
  "min_20m": {
   "gradient_pct": -1.0651722004361908,
   "start_distance_m": 25.0,
   "end_distance_m": 45.0,
   "midpoint_distance_m": 35.0,
   "start_elevation_m": 31.970884183144147,
   "end_elevation_m": 31.75784974305691,
   "start_xy": [
    380028.41683937516,
    158911.7429393789
   ],
   "end_xy": [
    380047.4409214227,
    158905.5716913488
   ]
  },
  "min_25m": {
   "gradient_pct": -0.9225801653381893,
   "start_distance_m": 20.0,
   "end_distance_m": 45.0,
   "midpoint_distance_m": 32.5,
   "start_elevation_m": 31.988494784391456,
   "end_elevation_m": 31.75784974305691,
   "start_xy": [
    380026.2746145523,
    158907.71324619607
   ],
   "end_xy": [
    380047.4409214227,
    158905.5716913488
   ]
  },
  "min_50m": {
   "gradient_pct": 0.018935403231289172,
   "start_distance_m": 18.0,
   "end_distance_m": 68.0,
   "midpoint_distance_m": 43.0,
   "start_elevation_m": 31.997913659283643,
   "end_elevation_m": 32.00738136089929,
   "start_xy": [
    380025.5276403818,
    158905.85805222823
   ],
   "end_xy": [
    380069.4507568695,
    158898.9347595183
   ]
  },
  "min_100m": {
   "gradient_pct": 3.7740604552832053,
   "start_distance_m": 350.0,
   "end_distance_m": 450.0,
   "midpoint_distance_m": 400.0,
   "start_elevation_m": 72.30020869386843,
   "end_elevation_m": 76.07426914915163,
   "start_xy": [
    380304.52479659475,
    158894.12673285307
   ],
   "end_xy": [
    380385.8233472589,
    158949.43774955237
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.929661329461425,
   "start_distance_m": 312.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 313.0,
   "start_elevation_m": 68.11935895131299,
   "end_elevation_m": 68.79795217790222,
   "start_xy": [
    380269.74231442175,
    158878.86390312784
   ],
   "end_xy": [
    380271.58941454353,
    158879.6308588894
   ]
  },
  "max_3m": {
   "gradient_pct": 32.19454874811163,
   "start_distance_m": 311.0,
   "end_distance_m": 314.0,
   "midpoint_distance_m": 312.5,
   "start_elevation_m": 67.83211571545887,
   "end_elevation_m": 68.79795217790222,
   "start_xy": [
    380268.81876436085,
    158878.48042524708
   ],
   "end_xy": [
    380271.58941454353,
    158879.6308588894
   ]
  }
 },
 "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": 0.08,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.422,
   "obstruction_max_height_m": 18.35,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50
   ]
  },
  "excluded_ranges_m": [
   [
    0.0,
    23.0
   ],
   [
    149.0,
    154.0
   ],
   [
    278.0,
    284.0
   ]
  ],
  "review": [],
  "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/ST7555.tif",
   "data/cache/england/bulk_dtm_1m/ST8055.tif"
  ],
  "calculated_at": "2026-09-05T01:45:22+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/mnt/HC_Volume_106792346/hunt-gb/regions/region-08.osm.pbf",
  "osm_snapshot": "",
  "run_id": "hunt-england-260905",
  "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": [
   "ST7555.tif",
   "ST8055.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Westwood",
  "county": "Wiltshire"
 }
}