{
 "ocl_version": "0.1.0",
 "name": "Downe Road",
 "slug": "downe-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.20580333787859,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 701.0,
   "end_distance_m": 703.0,
   "start_elevation_m": 149.6633246310364,
   "end_elevation_m": 150.32744069779397,
   "min_gradient_pct": -14.906633251815293,
   "suppressed_max_gradient_pct": 36.41452687875528,
   "suppressed_location_m": [
    786.0,
    788.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.788519902103797,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 700.0,
   "end_distance_m": 703.0,
   "start_elevation_m": 149.49378510073086,
   "end_elevation_m": 150.32744069779397,
   "min_gradient_pct": -12.280517649925097,
   "suppressed_max_gradient_pct": 35.50671395010454,
   "suppressed_location_m": [
    786.0,
    789.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.36796927535056,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 698.0,
   "end_distance_m": 703.0,
   "start_elevation_m": 149.10904223402645,
   "end_elevation_m": 150.32744069779397,
   "min_gradient_pct": -11.786711423339682,
   "suppressed_max_gradient_pct": 33.78959605084617,
   "suppressed_location_m": [
    791.0,
    796.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.55928010599939,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 701.0,
   "end_distance_m": 711.0,
   "start_elevation_m": 149.6633246310364,
   "end_elevation_m": 152.01925264163634,
   "min_gradient_pct": -10.306250000883495,
   "suppressed_max_gradient_pct": 33.07928912235184,
   "suppressed_location_m": [
    786.0,
    796.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 19.36412111584204,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 692.0,
   "end_distance_m": 712.0,
   "start_elevation_m": 148.3457485215733,
   "end_elevation_m": 152.21857274474172,
   "min_gradient_pct": -10.135406151736248,
   "suppressed_max_gradient_pct": 24.619810726760818,
   "suppressed_location_m": [
    776.0,
    796.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 19.363063446371484,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 822.0,
   "end_distance_m": 847.0,
   "start_elevation_m": 168.01313423846273,
   "end_elevation_m": 172.8539001000556,
   "min_gradient_pct": -9.915534361703237,
   "suppressed_max_gradient_pct": 23.24370683839379,
   "suppressed_location_m": [
    771.0,
    796.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.852910735845114,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 808.0,
   "end_distance_m": 858.0,
   "start_elevation_m": 165.72985738832546,
   "end_elevation_m": 174.656312756248,
   "min_gradient_pct": -8.853149090606905,
   "suppressed_max_gradient_pct": 19.733879457942578,
   "suppressed_location_m": [
    747.0,
    797.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.088447753522985,
   "diagnostic": false,
   "flags": [
    "texture_excluded"
   ],
   "start_distance_m": 801.0,
   "end_distance_m": 901.0,
   "start_elevation_m": 165.00322254419902,
   "end_elevation_m": 179.091670297722,
   "min_gradient_pct": -7.474566809062281,
   "suppressed_max_gradient_pct": 18.157428729203275,
   "suppressed_location_m": [
    753.0,
    853.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.542,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 70.0,
  "shape_class": "stepped"
 },
 "length_m": 1032.3004653781236,
 "start_elevation_m": 128.21709377581544,
 "end_elevation_m": 183.55775892219597,
 "endpoint_gain_m": 55.34066514638053,
 "overall_gradient_pct": 5.36090673233492,
 "accumulated_ascent_m": 67.87304817210399,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.36796927535056,
   "start_distance_m": 698.0,
   "end_distance_m": 703.0,
   "midpoint_distance_m": 700.5,
   "start_elevation_m": 149.10904223402645,
   "end_elevation_m": 150.32744069779397,
   "start_xy": [
    544316.5464212605,
    160092.175792039
   ],
   "end_xy": [
    544319.832805878,
    160088.40754668778
   ]
  },
  "max_10m": {
   "gradient_pct": 23.55928010599939,
   "start_distance_m": 701.0,
   "end_distance_m": 711.0,
   "midpoint_distance_m": 706.0,
   "start_elevation_m": 149.6633246310364,
   "end_elevation_m": 152.01925264163634,
   "start_xy": [
    544318.5183220631,
    160089.91490588192
   ],
   "end_xy": [
    544325.0907306154,
    160082.3781028021
   ]
  },
  "max_20m": {
   "gradient_pct": 19.36412111584204,
   "start_distance_m": 692.0,
   "end_distance_m": 712.0,
   "midpoint_distance_m": 702.0,
   "start_elevation_m": 148.3457485215733,
   "end_elevation_m": 152.21857274474172,
   "start_xy": [
    544312.6021771369,
    160096.6971772278
   ],
   "end_xy": [
    544325.7326489585,
    160081.61315405788
   ]
  },
  "max_25m": {
   "gradient_pct": 19.363063446371484,
   "start_distance_m": 822.0,
   "end_distance_m": 847.0,
   "midpoint_distance_m": 834.5,
   "start_elevation_m": 168.01313423846273,
   "end_elevation_m": 172.8539001000556,
   "start_xy": [
    544388.2039874818,
    160003.15309768153
   ],
   "end_xy": [
    544398.2743638405,
    159980.510743162
   ]
  },
  "max_50m": {
   "gradient_pct": 17.852910735845114,
   "start_distance_m": 808.0,
   "end_distance_m": 858.0,
   "midpoint_distance_m": 833.0,
   "start_elevation_m": 165.72985738832546,
   "end_elevation_m": 174.656312756248,
   "start_xy": [
    544377.0649239334,
    160008.09323387014
   ],
   "end_xy": [
    544401.7400887624,
    159970.08327998008
   ]
  },
  "max_100m": {
   "gradient_pct": 14.088447753522985,
   "start_distance_m": 801.0,
   "end_distance_m": 901.0,
   "midpoint_distance_m": 851.0,
   "start_elevation_m": 165.00322254419902,
   "end_elevation_m": 179.091670297722,
   "start_xy": [
    544370.0676970315,
    160007.89623274963
   ],
   "end_xy": [
    544437.9733863979,
    159959.5935558408
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -11.786711423339682,
   "start_distance_m": 114.0,
   "end_distance_m": 119.0,
   "midpoint_distance_m": 116.5,
   "start_elevation_m": 120.24591943547907,
   "end_elevation_m": 119.65658386431208,
   "start_xy": [
    543980.5541391111,
    160562.3238952317
   ],
   "end_xy": [
    543984.7763783342,
    160559.64570759828
   ]
  },
  "min_10m": {
   "gradient_pct": -10.306250000883495,
   "start_distance_m": 22.0,
   "end_distance_m": 32.0,
   "midpoint_distance_m": 27.0,
   "start_elevation_m": 126.45815795781698,
   "end_elevation_m": 125.42753295772863,
   "start_xy": [
    543895.1092230873,
    160584.15208356842
   ],
   "end_xy": [
    543904.5989268906,
    160586.96745630755
   ]
  },
  "min_20m": {
   "gradient_pct": -10.135406151736248,
   "start_distance_m": 22.0,
   "end_distance_m": 42.0,
   "midpoint_distance_m": 32.0,
   "start_elevation_m": 126.45815795781698,
   "end_elevation_m": 124.43107672746973,
   "start_xy": [
    543895.1092230873,
    160584.15208356842
   ],
   "end_xy": [
    543914.59112051,
    160586.5724351796
   ]
  },
  "min_25m": {
   "gradient_pct": -9.915534361703237,
   "start_distance_m": 18.0,
   "end_distance_m": 43.0,
   "midpoint_distance_m": 30.5,
   "start_elevation_m": 126.82130195225363,
   "end_elevation_m": 124.34241836182782,
   "start_xy": [
    543891.363003484,
    160582.75000130138
   ],
   "end_xy": [
    543915.5903219738,
    160586.53247992293
   ]
  },
  "min_50m": {
   "gradient_pct": -8.853149090606905,
   "start_distance_m": 5.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 30.0,
   "start_elevation_m": 127.85532446204364,
   "end_elevation_m": 123.42874991674019,
   "start_xy": [
    543879.1886718252,
    160578.190877416
   ],
   "end_xy": [
    543927.5809543432,
    160586.05845523585
   ]
  },
  "min_100m": {
   "gradient_pct": -7.474566809062281,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 128.21709377581544,
   "end_elevation_m": 120.74252696675316,
   "start_xy": [
    543874.506,
    160576.438
   ],
   "end_xy": [
    543968.7331554475,
    160569.8248491471
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.20580333787859,
   "start_distance_m": 701.0,
   "end_distance_m": 703.0,
   "midpoint_distance_m": 702.0,
   "start_elevation_m": 149.6633246310364,
   "end_elevation_m": 150.32744069779397,
   "start_xy": [
    544318.5183220631,
    160089.91490588192
   ],
   "end_xy": [
    544319.832805878,
    160088.40754668778
   ]
  },
  "max_3m": {
   "gradient_pct": 27.788519902103797,
   "start_distance_m": 700.0,
   "end_distance_m": 703.0,
   "midpoint_distance_m": 701.5,
   "start_elevation_m": 149.49378510073086,
   "end_elevation_m": 150.32744069779397,
   "start_xy": [
    544317.8609051502,
    160090.66843291014
   ],
   "end_xy": [
    544319.832805878,
    160088.40754668778
   ]
  }
 },
 "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": 0.029,
   "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": 771.0,
     "end_m": 796.0,
     "raw_pct": 23.24,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 776.0,
     "end_m": 796.0,
     "raw_pct": 24.62,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 786.0,
     "end_m": 796.0,
     "raw_pct": 33.08,
     "reason": "hump"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.255,
   "obstruction_max_height_m": 15.51,
   "flagged_windows_m": [
    2,
    3,
    5,
    20
   ]
  },
  "excluded_ranges_m": [
   [
    769.0,
    798.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_start"
  ]
 },
 "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/TQ4055.tif",
   "data/cache/england/bulk_dtm_1m/TQ4060.tif"
  ],
  "calculated_at": "2026-09-11T23:19:48+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/texture-uk-england/batch-england-rchunk03.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": [
   "TQ4055.tif",
   "TQ4060.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Luxted",
  "county": "Greater London"
 }
}