{
 "ocl_version": "0.1.0",
 "name": "Blackhouse Hill",
 "slug": "blackhouse-hill",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 51.220868410759834,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 541.0,
   "end_distance_m": 543.0,
   "start_elevation_m": 91.9303052713017,
   "end_elevation_m": 92.9547226395169,
   "min_gradient_pct": -23.40647298034071
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 50.9184018189463,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 540.0,
   "end_distance_m": 543.0,
   "start_elevation_m": 91.42717058494851,
   "end_elevation_m": 92.9547226395169,
   "min_gradient_pct": -19.424536332623177
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 46.578296741410554,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 540.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 91.42717058494851,
   "end_elevation_m": 93.75608542201904,
   "min_gradient_pct": -16.447875182490463
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 43.24026609879084,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 539.0,
   "end_distance_m": 549.0,
   "start_elevation_m": 91.08060601306445,
   "end_elevation_m": 95.40463262294354,
   "min_gradient_pct": -12.135041054763036
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 28.49678861177573,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 529.0,
   "end_distance_m": 549.0,
   "start_elevation_m": 89.70527490058839,
   "end_elevation_m": 95.40463262294354,
   "min_gradient_pct": -9.372898259746236
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.167472728261547,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 524.0,
   "end_distance_m": 549.0,
   "start_elevation_m": 88.86276444087815,
   "end_elevation_m": 95.40463262294354,
   "min_gradient_pct": -5.750927745468971
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.210563481727604,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 499.0,
   "end_distance_m": 549.0,
   "start_elevation_m": 86.29935088207974,
   "end_elevation_m": 95.40463262294354,
   "min_gradient_pct": 4.373674629612253
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.83905517617201,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 449.0,
   "end_distance_m": 549.0,
   "start_elevation_m": 80.56557744677153,
   "end_elevation_m": 95.40463262294354,
   "min_gradient_pct": 5.969434714052973
  }
 ],
 "shape": {
  "ascent_concentration": 0.353,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 79.0,
  "shape_class": "sustained"
 },
 "length_m": 593.7481208544829,
 "start_elevation_m": 41.41142418917798,
 "end_elevation_m": 95.1427388529971,
 "endpoint_gain_m": 53.73131466381912,
 "overall_gradient_pct": 9.049513215552174,
 "accumulated_ascent_m": 56.86101903888791,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 46.578296741410554,
   "start_distance_m": 540.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 542.5,
   "start_elevation_m": 91.42717058494851,
   "end_elevation_m": 93.75608542201904,
   "start_xy": [
    617126.0211039082,
    135772.26635249486
   ],
   "end_xy": [
    617130.6904667895,
    135774.0543822157
   ]
  },
  "max_10m": {
   "gradient_pct": 43.24026609879084,
   "start_distance_m": 539.0,
   "end_distance_m": 549.0,
   "midpoint_distance_m": 544.0,
   "start_elevation_m": 91.08060601306445,
   "end_elevation_m": 95.40463262294354,
   "start_xy": [
    617125.087231332,
    135771.9087465507
   ],
   "end_xy": [
    617134.4259570945,
    135775.48480599234
   ]
  },
  "max_20m": {
   "gradient_pct": 28.49678861177573,
   "start_distance_m": 529.0,
   "end_distance_m": 549.0,
   "midpoint_distance_m": 539.0,
   "start_elevation_m": 89.70527490058839,
   "end_elevation_m": 95.40463262294354,
   "start_xy": [
    617115.7485055693,
    135768.33268710907
   ],
   "end_xy": [
    617134.4259570945,
    135775.48480599234
   ]
  },
  "max_25m": {
   "gradient_pct": 26.167472728261547,
   "start_distance_m": 524.0,
   "end_distance_m": 549.0,
   "midpoint_distance_m": 536.5,
   "start_elevation_m": 88.86276444087815,
   "end_elevation_m": 95.40463262294354,
   "start_xy": [
    617111.079142688,
    135766.54465738827
   ],
   "end_xy": [
    617134.4259570945,
    135775.48480599234
   ]
  },
  "max_50m": {
   "gradient_pct": 18.210563481727604,
   "start_distance_m": 499.0,
   "end_distance_m": 549.0,
   "midpoint_distance_m": 524.0,
   "start_elevation_m": 86.29935088207974,
   "end_elevation_m": 95.40463262294354,
   "start_xy": [
    617088.6909154048,
    135755.44800778892
   ],
   "end_xy": [
    617134.4259570945,
    135775.48480599234
   ]
  },
  "max_100m": {
   "gradient_pct": 14.83905517617201,
   "start_distance_m": 449.0,
   "end_distance_m": 549.0,
   "midpoint_distance_m": 499.0,
   "start_elevation_m": 80.56557744677153,
   "end_elevation_m": 95.40463262294354,
   "start_xy": [
    617044.127722057,
    135732.8243501636
   ],
   "end_xy": [
    617134.4259570945,
    135775.48480599234
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -16.447875182490463,
   "start_distance_m": 558.0,
   "end_distance_m": 563.0,
   "midpoint_distance_m": 560.5,
   "start_elevation_m": 94.40805921150857,
   "end_elevation_m": 93.58566545238405,
   "start_xy": [
    617142.830810281,
    135778.7032594898
   ],
   "end_xy": [
    617147.5001731623,
    135780.4912892106
   ]
  },
  "min_10m": {
   "gradient_pct": -12.135041054763036,
   "start_distance_m": 550.0,
   "end_distance_m": 560.0,
   "midpoint_distance_m": 555.0,
   "start_elevation_m": 95.30649392698831,
   "end_elevation_m": 94.092989821512,
   "start_xy": [
    617135.3598296709,
    135775.8424119365
   ],
   "end_xy": [
    617144.6985554335,
    135779.41847137813
   ]
  },
  "min_20m": {
   "gradient_pct": -9.372898259746236,
   "start_distance_m": 549.0,
   "end_distance_m": 569.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 95.40463262294354,
   "end_elevation_m": 93.53005297099429,
   "start_xy": [
    617134.4259570945,
    135775.48480599234
   ],
   "end_xy": [
    617153.1034086199,
    135782.63692487558
   ]
  },
  "min_25m": {
   "gradient_pct": -5.750927745468971,
   "start_distance_m": 549.0,
   "end_distance_m": 574.0,
   "midpoint_distance_m": 561.5,
   "start_elevation_m": 95.40463262294354,
   "end_elevation_m": 93.9669006865763,
   "start_xy": [
    617134.4259570945,
    135775.48480599234
   ],
   "end_xy": [
    617157.7727715012,
    135784.42495459638
   ]
  },
  "min_50m": {
   "gradient_pct": 4.373674629612253,
   "start_distance_m": 543.0,
   "end_distance_m": 593.0,
   "midpoint_distance_m": 568.0,
   "start_elevation_m": 92.9547226395169,
   "end_elevation_m": 95.14155995432303,
   "start_xy": [
    617128.822721637,
    135773.33917032735
   ],
   "end_xy": [
    617175.5163504502,
    135791.21946753547
   ]
  },
  "min_100m": {
   "gradient_pct": 5.969434714052973,
   "start_distance_m": 5.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 55.0,
   "start_elevation_m": 41.76278472830203,
   "end_elevation_m": 47.732219442355,
   "start_xy": [
    616775.1891988073,
    135416.57127252952
   ],
   "end_xy": [
    616790.9722783337,
    135515.25835982768
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 51.220868410759834,
   "start_distance_m": 541.0,
   "end_distance_m": 543.0,
   "midpoint_distance_m": 542.0,
   "start_elevation_m": 91.9303052713017,
   "end_elevation_m": 92.9547226395169,
   "start_xy": [
    617126.9549764844,
    135772.623958439
   ],
   "end_xy": [
    617128.822721637,
    135773.33917032735
   ]
  },
  "max_3m": {
   "gradient_pct": 50.9184018189463,
   "start_distance_m": 540.0,
   "end_distance_m": 543.0,
   "midpoint_distance_m": 541.5,
   "start_elevation_m": 91.42717058494851,
   "end_elevation_m": 92.9547226395169,
   "start_xy": [
    617126.0211039082,
    135772.26635249486
   ],
   "end_xy": [
    617128.822721637,
    135773.33917032735
   ]
  }
 },
 "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": {
  "review": [
   "max5_over_45",
   "max10_over_40"
  ],
  "extent": [
   "may_continue_beyond_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/TR1535.tif"
  ],
  "calculated_at": "2026-08-16T03:37:13+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",
  "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": [
   "TR1535.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 12.4% over 200 m (Terrain 50), gain 49.9 m over 530 m way. EXTENDED by graph walk: +2 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
  "canopy_check": "unavailable \u2014 surface model missing: unexpected zip contents for TR1535: []"
 },
 "area": {
  "place": "Hythe",
  "county": "Kent"
 }
}