{
 "ocl_version": "0.1.0",
 "name": "Kent Hatch Road",
 "slug": "kent-hatch-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.952948211307444,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "placement_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 552.0,
   "end_distance_m": 554.0,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 152.01088812586235,
   "min_gradient_pct": -34.90580982959273,
   "suppressed_max_gradient_pct": 55.87543996920061,
   "suppressed_location_m": [
    607.0,
    609.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 39.51316190927893,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 552.0,
   "end_distance_m": 555.0,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 152.25722401891457,
   "min_gradient_pct": -33.03735499084155,
   "suppressed_max_gradient_pct": 49.99439758115235,
   "suppressed_location_m": [
    606.0,
    609.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.262228042434344,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 557.0,
   "end_distance_m": 562.0,
   "start_elevation_m": 152.390694909642,
   "end_elevation_m": 153.75380631176373,
   "min_gradient_pct": -17.4724410152578,
   "suppressed_max_gradient_pct": 41.049878026392435,
   "suppressed_location_m": [
    604.0,
    609.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.819771501275227,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 552.0,
   "end_distance_m": 562.0,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 153.75380631176373,
   "min_gradient_pct": -7.591062597551854,
   "suppressed_max_gradient_pct": 29.489686312640515,
   "suppressed_location_m": [
    599.0,
    609.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.589188999197205,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 540.0,
   "end_distance_m": 560.0,
   "start_elevation_m": 148.93922169468124,
   "end_elevation_m": 153.45705949452068,
   "min_gradient_pct": -4.8700902419676595,
   "suppressed_max_gradient_pct": 25.6015447846616,
   "suppressed_location_m": [
    589.0,
    609.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.010359966788656,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 539.0,
   "end_distance_m": 564.0,
   "start_elevation_m": 148.77305132932992,
   "end_elevation_m": 154.02564132102708,
   "min_gradient_pct": -4.166779074245255,
   "suppressed_max_gradient_pct": 24.72964289720403,
   "suppressed_location_m": [
    584.0,
    609.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.406827838631102,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 513.0,
   "end_distance_m": 563.0,
   "start_elevation_m": 145.2019974540504,
   "end_elevation_m": 153.90541137336595,
   "min_gradient_pct": -3.137904540107286
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.48702491129859,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 502.0,
   "end_distance_m": 602.0,
   "start_elevation_m": 143.87237729712677,
   "end_elevation_m": 159.35940220842537,
   "min_gradient_pct": -2.0968978749058067,
   "suppressed_max_gradient_pct": 16.873306324265826,
   "suppressed_location_m": [
    509.0,
    609.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.457,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 83.0,
  "shape_class": "stepped"
 },
 "length_m": 1287.0334023924534,
 "start_elevation_m": 115.28482158306858,
 "end_elevation_m": 190.12950891342336,
 "endpoint_gain_m": 74.84468733035479,
 "overall_gradient_pct": 5.815287092877835,
 "accumulated_ascent_m": 86.85377824904769,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.262228042434344,
   "start_distance_m": 557.0,
   "end_distance_m": 562.0,
   "midpoint_distance_m": 559.5,
   "start_elevation_m": 152.390694909642,
   "end_elevation_m": 153.75380631176373,
   "start_xy": [
    544156.7554609063,
    150973.9595074705
   ],
   "end_xy": [
    544156.7039637022,
    150978.95912047682
   ]
  },
  "max_10m": {
   "gradient_pct": 26.819771501275227,
   "start_distance_m": 552.0,
   "end_distance_m": 562.0,
   "midpoint_distance_m": 557.0,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 153.75380631176373,
   "start_xy": [
    544156.7722784049,
    150968.9595357534
   ],
   "end_xy": [
    544156.7039637022,
    150978.95912047682
   ]
  },
  "max_20m": {
   "gradient_pct": 22.589188999197205,
   "start_distance_m": 540.0,
   "end_distance_m": 560.0,
   "midpoint_distance_m": 550.0,
   "start_elevation_m": 148.93922169468124,
   "end_elevation_m": 153.45705949452068,
   "start_xy": [
    544157.5608654883,
    150956.99755293035
   ],
   "end_xy": [
    544156.7386076264,
    150976.95942054968
   ]
  },
  "max_25m": {
   "gradient_pct": 21.010359966788656,
   "start_distance_m": 539.0,
   "end_distance_m": 564.0,
   "midpoint_distance_m": 551.5,
   "start_elevation_m": 148.77305132932992,
   "end_elevation_m": 154.02564132102708,
   "start_xy": [
    544157.6586965903,
    150956.00234989804
   ],
   "end_xy": [
    544156.669319778,
    150980.95882040393
   ]
  },
  "max_50m": {
   "gradient_pct": 17.406827838631102,
   "start_distance_m": 513.0,
   "end_distance_m": 563.0,
   "midpoint_distance_m": 538.0,
   "start_elevation_m": 145.2019974540504,
   "end_elevation_m": 153.90541137336595,
   "start_xy": [
    544160.2023052435,
    150930.12707105858
   ],
   "end_xy": [
    544156.6866417401,
    150979.95897044038
   ]
  },
  "max_100m": {
   "gradient_pct": 15.48702491129859,
   "start_distance_m": 502.0,
   "end_distance_m": 602.0,
   "midpoint_distance_m": 552.0,
   "start_elevation_m": 143.87237729712677,
   "end_elevation_m": 159.35940220842537,
   "start_xy": [
    544161.2784473659,
    150919.1798377034
   ],
   "end_xy": [
    544160.7747963561,
    151018.72710682705
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -17.4724410152578,
   "start_distance_m": 653.0,
   "end_distance_m": 658.0,
   "midpoint_distance_m": 655.5,
   "start_elevation_m": 165.61185090008047,
   "end_elevation_m": 164.73822884931758,
   "start_xy": [
    544166.9027297274,
    151069.35761573815
   ],
   "end_xy": [
    544167.503507509,
    151074.3213911216
   ]
  },
  "min_10m": {
   "gradient_pct": -7.591062597551854,
   "start_distance_m": 686.0,
   "end_distance_m": 696.0,
   "midpoint_distance_m": 691.0,
   "start_elevation_m": 165.69937851742122,
   "end_elevation_m": 164.94027225766604,
   "start_xy": [
    544170.8678630855,
    151102.11853326886
   ],
   "end_xy": [
    544172.0694186485,
    151112.04608403574
   ]
  },
  "min_20m": {
   "gradient_pct": -4.8700902419676595,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 115.28482158306858,
   "end_elevation_m": 114.31080353467505,
   "start_xy": [
    544081.182,
    150504.368
   ],
   "end_xy": [
    544094.7318781218,
    150489.6792741108
   ]
  },
  "min_25m": {
   "gradient_pct": -4.166779074245255,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 115.28482158306858,
   "end_elevation_m": 114.24312681450726,
   "start_xy": [
    544081.182,
    150504.368
   ],
   "end_xy": [
    544099.0670182182,
    150492.1705710309
   ]
  },
  "min_50m": {
   "gradient_pct": -3.137904540107286,
   "start_distance_m": 1104.0,
   "end_distance_m": 1154.0,
   "midpoint_distance_m": 1129.0,
   "start_elevation_m": 193.2940421454743,
   "end_elevation_m": 191.72508987542065,
   "start_xy": [
    544001.2711192734,
    151462.61240777344
   ],
   "end_xy": [
    543961.3529333648,
    151492.72118445614
   ]
  },
  "min_100m": {
   "gradient_pct": -2.0968978749058067,
   "start_distance_m": 1102.0,
   "end_distance_m": 1202.0,
   "midpoint_distance_m": 1152.0,
   "start_elevation_m": 193.33929571347315,
   "end_elevation_m": 191.24239783856734,
   "start_xy": [
    544002.8678903532,
    151461.40811457043
   ],
   "end_xy": [
    543923.0316145762,
    151521.62579527003
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.952948211307444,
   "start_distance_m": 552.0,
   "end_distance_m": 554.0,
   "midpoint_distance_m": 553.0,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 152.01088812586235,
   "start_xy": [
    544156.7722784049,
    150968.9595357534
   ],
   "end_xy": [
    544156.7655514055,
    150970.95952444026
   ]
  },
  "max_3m": {
   "gradient_pct": 39.51316190927893,
   "start_distance_m": 552.0,
   "end_distance_m": 555.0,
   "midpoint_distance_m": 553.5,
   "start_elevation_m": 151.0718291616362,
   "end_elevation_m": 152.25722401891457,
   "start_xy": [
    544156.7722784049,
    150968.9595357534
   ],
   "end_xy": [
    544156.7621879057,
    150971.95951878367
   ]
  }
 },
 "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": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "placement_suppression": {
   "masked_fraction": 0.036,
   "windows_resited": [
    2.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.317,
   "obstruction_max_height_m": 16.27,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    605.0,
    610.0
   ],
   [
    630.0,
    670.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_start",
   "descends_at_end"
  ]
 },
 "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/TQ4050.tif"
  ],
  "calculated_at": "2026-08-31T05:58:14+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12-roads.osm.pbf",
  "osm_snapshot": "2026-08-12T20:21:46Z",
  "run_id": "placement-mask-260831",
  "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": [
   "TQ4050.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Crockham Hill",
  "county": "Kent"
 }
}