{
 "ocl_version": "0.1.0",
 "name": "Alton Hill",
 "slug": "alton-hill",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.50190109374063,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 437.0,
   "end_distance_m": 439.0,
   "start_elevation_m": 193.86267211725757,
   "end_elevation_m": 194.5527101391324,
   "min_gradient_pct": -16.143793252390992,
   "suppressed_max_gradient_pct": 39.922368863344104,
   "suppressed_location_m": [
    355.0,
    357.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.04717656999875,
   "diagnostic": true,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 437.0,
   "end_distance_m": 440.0,
   "start_elevation_m": 193.86267211725757,
   "end_elevation_m": 194.85408741435754,
   "min_gradient_pct": -13.015456781950737,
   "suppressed_max_gradient_pct": 38.58898631500267,
   "suppressed_location_m": [
    355.0,
    358.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.86716475096705,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 436.0,
   "end_distance_m": 441.0,
   "start_elevation_m": 193.62650723854614,
   "end_elevation_m": 195.0698654760945,
   "min_gradient_pct": -12.551941612343853,
   "suppressed_max_gradient_pct": 35.750262765729985,
   "suppressed_location_m": [
    354.0,
    359.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.91928615587335,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 435.0,
   "end_distance_m": 445.0,
   "start_elevation_m": 193.45545835464827,
   "end_elevation_m": 195.5473869702356,
   "min_gradient_pct": -11.524314423509168,
   "suppressed_max_gradient_pct": 31.346795972672226,
   "suppressed_location_m": [
    351.0,
    361.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.9708516529667,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 275.0,
   "end_distance_m": 295.0,
   "start_elevation_m": 173.7904212296673,
   "end_elevation_m": 177.18459156026063,
   "min_gradient_pct": -10.508188882023433,
   "suppressed_max_gradient_pct": 24.975089094821925,
   "suppressed_location_m": [
    348.0,
    368.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.67276932220898,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 270.0,
   "end_distance_m": 295.0,
   "start_elevation_m": 173.01639922970838,
   "end_elevation_m": 177.18459156026063,
   "min_gradient_pct": -10.109986861969901,
   "suppressed_max_gradient_pct": 22.773498771135564,
   "suppressed_location_m": [
    349.0,
    374.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.177198701043665,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 625.0,
   "end_distance_m": 675.0,
   "start_elevation_m": 211.58759943083132,
   "end_elevation_m": 219.17619878135315,
   "min_gradient_pct": -8.57723263665423,
   "suppressed_max_gradient_pct": 16.992362460182164,
   "suppressed_location_m": [
    334.0,
    384.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.322980169054063,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 631.0,
   "end_distance_m": 731.0,
   "start_elevation_m": 212.43063782172413,
   "end_elevation_m": 226.7536179907782,
   "min_gradient_pct": -2.9092976541554663,
   "suppressed_max_gradient_pct": 14.397728424608545,
   "suppressed_location_m": [
    268.0,
    368.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.452,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 170.0,
  "shape_class": "stepped"
 },
 "length_m": 2211.2963211081296,
 "start_elevation_m": 159.15585340881427,
 "end_elevation_m": 293.0176168029788,
 "endpoint_gain_m": 133.86176339416454,
 "overall_gradient_pct": 6.0535425359493855,
 "accumulated_ascent_m": 144.25738086208835,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.86716475096705,
   "start_distance_m": 436.0,
   "end_distance_m": 441.0,
   "midpoint_distance_m": 438.5,
   "start_elevation_m": 193.62650723854614,
   "end_elevation_m": 195.0698654760945,
   "start_xy": [
    436656.07235787413,
    364387.39279820037
   ],
   "end_xy": [
    436651.07324199745,
    364387.48680040205
   ]
  },
  "max_10m": {
   "gradient_pct": 20.91928615587335,
   "start_distance_m": 435.0,
   "end_distance_m": 445.0,
   "midpoint_distance_m": 440.0,
   "start_elevation_m": 193.45545835464827,
   "end_elevation_m": 195.5473869702356,
   "start_xy": [
    436657.072177423,
    364387.37380162894
   ],
   "end_xy": [
    436647.0739353582,
    364387.5588592243
   ]
  },
  "max_20m": {
   "gradient_pct": 16.9708516529667,
   "start_distance_m": 275.0,
   "end_distance_m": 295.0,
   "midpoint_distance_m": 285.0,
   "start_elevation_m": 173.7904212296673,
   "end_elevation_m": 177.18459156026063,
   "start_xy": [
    436811.38903510256,
    364420.9270935716
   ],
   "end_xy": [
    436792.1928725532,
    364415.3139606119
   ]
  },
  "max_25m": {
   "gradient_pct": 16.67276932220898,
   "start_distance_m": 270.0,
   "end_distance_m": 295.0,
   "midpoint_distance_m": 282.5,
   "start_elevation_m": 173.01639922970838,
   "end_elevation_m": 177.18459156026063,
   "start_xy": [
    436816.18790246244,
    364422.3309693666
   ],
   "end_xy": [
    436792.1928725532,
    364415.3139606119
   ]
  },
  "max_50m": {
   "gradient_pct": 15.177198701043665,
   "start_distance_m": 625.0,
   "end_distance_m": 675.0,
   "midpoint_distance_m": 650.0,
   "start_elevation_m": 211.58759943083132,
   "end_elevation_m": 219.17619878135315,
   "start_xy": [
    436469.94437200786,
    364374.32230635855
   ],
   "end_xy": [
    436425.25101099623,
    364351.91070592735
   ]
  },
  "max_100m": {
   "gradient_pct": 14.322980169054063,
   "start_distance_m": 631.0,
   "end_distance_m": 731.0,
   "midpoint_distance_m": 681.0,
   "start_elevation_m": 212.43063782172413,
   "end_elevation_m": 226.7536179907782,
   "start_xy": [
    436464.53282759077,
    364371.7309396
   ],
   "end_xy": [
    436375.38333985204,
    364326.43490294885
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.551941612343853,
   "start_distance_m": 2141.0,
   "end_distance_m": 2146.0,
   "midpoint_distance_m": 2143.5,
   "start_elevation_m": 291.102272015214,
   "end_elevation_m": 290.4746749345968,
   "start_xy": [
    435448.776827255,
    363881.41116851923
   ],
   "end_xy": [
    435449.6459014788,
    363876.4872771378
   ]
  },
  "min_10m": {
   "gradient_pct": -11.524314423509168,
   "start_distance_m": 2136.0,
   "end_distance_m": 2146.0,
   "midpoint_distance_m": 2141.0,
   "start_elevation_m": 291.6271063769477,
   "end_elevation_m": 290.4746749345968,
   "start_xy": [
    435447.9486551873,
    363886.3418067983
   ],
   "end_xy": [
    435449.6459014788,
    363876.4872771378
   ]
  },
  "min_20m": {
   "gradient_pct": -10.508188882023433,
   "start_distance_m": 2134.0,
   "end_distance_m": 2154.0,
   "midpoint_distance_m": 2144.0,
   "start_elevation_m": 291.82047872458367,
   "end_elevation_m": 289.718840948179,
   "start_xy": [
    435447.64913713885,
    363888.3192517237
   ],
   "end_xy": [
    435451.50158445584,
    363868.739733889
   ]
  },
  "min_25m": {
   "gradient_pct": -10.109986861969901,
   "start_distance_m": 2129.0,
   "end_distance_m": 2154.0,
   "midpoint_distance_m": 2141.5,
   "start_elevation_m": 292.24633766367145,
   "end_elevation_m": 289.718840948179,
   "start_xy": [
    435446.9006396782,
    363893.2629090551
   ],
   "end_xy": [
    435451.50158445584,
    363868.739733889
   ]
  },
  "min_50m": {
   "gradient_pct": -8.57723263665423,
   "start_distance_m": 2104.0,
   "end_distance_m": 2154.0,
   "midpoint_distance_m": 2129.0,
   "start_elevation_m": 294.0074572665061,
   "end_elevation_m": 289.718840948179,
   "start_xy": [
    435446.2065524885,
    363918.0461069988
   ],
   "end_xy": [
    435451.50158445584,
    363868.739733889
   ]
  },
  "min_100m": {
   "gradient_pct": -2.9092976541554663,
   "start_distance_m": 2062.0,
   "end_distance_m": 2162.0,
   "midpoint_distance_m": 2112.0,
   "start_elevation_m": 292.826672020919,
   "end_elevation_m": 289.9173743667635,
   "start_xy": [
    435463.1260867772,
    363956.4869189225
   ],
   "end_xy": [
    435459.0924923875,
    363867.05071646976
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.50190109374063,
   "start_distance_m": 437.0,
   "end_distance_m": 439.0,
   "midpoint_distance_m": 438.0,
   "start_elevation_m": 193.86267211725757,
   "end_elevation_m": 194.5527101391324,
   "start_xy": [
    436655.07253657834,
    364387.41170034156
   ],
   "end_xy": [
    436653.0728810951,
    364387.4488072592
   ]
  },
  "max_3m": {
   "gradient_pct": 33.04717656999875,
   "start_distance_m": 437.0,
   "end_distance_m": 440.0,
   "midpoint_distance_m": 438.5,
   "start_elevation_m": 193.86267211725757,
   "end_elevation_m": 194.85408741435754,
   "start_xy": [
    436655.07253657834,
    364387.41170034156
   ],
   "end_xy": [
    436652.07306154625,
    364387.46780383063
   ]
  }
 },
 "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": {
  "texture_suppression": {
   "masked_fraction": 0.014,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 349.0,
     "end_m": 374.0,
     "raw_pct": 22.77,
     "reason": "staircase+hump"
    },
    {
     "window_m": 20.0,
     "start_m": 348.0,
     "end_m": 368.0,
     "raw_pct": 24.98,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 351.0,
     "end_m": 361.0,
     "raw_pct": 31.35,
     "reason": "hump"
    },
    {
     "window_m": 5.0,
     "start_m": 354.0,
     "end_m": 359.0,
     "raw_pct": 35.75,
     "reason": "hump"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.056,
   "obstruction_max_height_m": 11.29,
   "flagged_windows_m": [
    20,
    25
   ]
  },
  "excluded_ranges_m": [
   [
    346.0,
    376.0
   ]
  ],
  "review": [],
  "extent": []
 },
 "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/SK3560.tif"
  ],
  "calculated_at": "2026-09-11T23:38:49+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/texture-uk-england/batch-england-rchunk04.pbf",
  "osm_snapshot": "",
  "run_id": "texture-uk-england-260911",
  "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": [
   "SK3560.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Alton",
  "county": "Derbyshire"
 }
}