{
 "ocl_version": "0.1.0",
 "name": "Daccombe Hill",
 "slug": "daccombe-hill",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 53.66861151929072,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 155.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 95.61715762789156,
   "end_elevation_m": 96.69052985827737,
   "min_gradient_pct": -7.7626875434219755
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 52.44096827353388,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 154.0,
   "end_distance_m": 157.0,
   "start_elevation_m": 95.11730081007136,
   "end_elevation_m": 96.69052985827737,
   "min_gradient_pct": -6.77236736486293
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 46.48899916701225,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 153.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 94.71672047460765,
   "end_elevation_m": 97.04117043295827,
   "min_gradient_pct": -6.30201742110728
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 33.93171608599161,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 148.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 93.6479988243591,
   "end_elevation_m": 97.04117043295827,
   "min_gradient_pct": -4.476751783499822
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.50531503523021,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 138.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 91.54010742591223,
   "end_elevation_m": 97.04117043295827,
   "min_gradient_pct": -2.5854453781833797
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.894074977813087,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "start_elevation_m": 90.567651688505,
   "end_elevation_m": 97.04117043295827,
   "min_gradient_pct": -2.056050900902733
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 22.92832444945097,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 153.0,
   "end_distance_m": 203.0,
   "start_elevation_m": 94.71672047460765,
   "end_elevation_m": 106.18088269933314,
   "min_gradient_pct": 2.34587718448347
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.327576492756435,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "start_elevation_m": 91.31829116438087,
   "end_elevation_m": 113.6458676571373,
   "min_gradient_pct": 7.272680248815946
  }
 ],
 "shape": {
  "ascent_concentration": 0.386,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 285.0,
  "shape_class": "sustained"
 },
 "length_m": 407.950067722498,
 "start_elevation_m": 77.54249271636914,
 "end_elevation_m": 135.8461688134765,
 "endpoint_gain_m": 58.30367609710737,
 "overall_gradient_pct": 14.291865772349274,
 "accumulated_ascent_m": 58.9039005912102,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 46.48899916701225,
   "start_distance_m": 153.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 155.5,
   "start_elevation_m": 94.71672047460765,
   "end_elevation_m": 97.04117043295827,
   "start_xy": [
    290387.292554667,
    67691.68393799385
   ],
   "end_xy": [
    290383.40290305525,
    67688.54218524433
   ]
  },
  "max_10m": {
   "gradient_pct": 33.93171608599161,
   "start_distance_m": 148.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 153.0,
   "start_elevation_m": 93.6479988243591,
   "end_elevation_m": 97.04117043295827,
   "start_xy": [
    290391.2914859555,
    67694.68483812666
   ],
   "end_xy": [
    290383.40290305525,
    67688.54218524433
   ]
  },
  "max_20m": {
   "gradient_pct": 27.50531503523021,
   "start_distance_m": 138.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 148.0,
   "start_elevation_m": 91.54010742591223,
   "end_elevation_m": 97.04117043295827,
   "start_xy": [
    290394.40884328575,
    67703.40860004304
   ],
   "end_xy": [
    290383.40290305525,
    67688.54218524433
   ]
  },
  "max_25m": {
   "gradient_pct": 25.894074977813087,
   "start_distance_m": 133.0,
   "end_distance_m": 158.0,
   "midpoint_distance_m": 145.5,
   "start_elevation_m": 90.567651688505,
   "end_elevation_m": 97.04117043295827,
   "start_xy": [
    290393.5477152854,
    67708.33388770641
   ],
   "end_xy": [
    290383.40290305525,
    67688.54218524433
   ]
  },
  "max_50m": {
   "gradient_pct": 22.92832444945097,
   "start_distance_m": 153.0,
   "end_distance_m": 203.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 94.71672047460765,
   "end_elevation_m": 106.18088269933314,
   "start_xy": [
    290387.292554667,
    67691.68393799385
   ],
   "end_xy": [
    290392.61178520543,
    67647.58289559618
   ]
  },
  "max_100m": {
   "gradient_pct": 22.327576492756435,
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 187.0,
   "start_elevation_m": 91.31829116438087,
   "end_elevation_m": 113.6458676571373,
   "start_xy": [
    290394.23661768564,
    67704.39365757571
   ],
   "end_xy": [
    290407.36184513033,
    67616.98090484687
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.30201742110728,
   "start_distance_m": 398.0,
   "end_distance_m": 403.0,
   "midpoint_distance_m": 400.5,
   "start_elevation_m": 136.3018053356769,
   "end_elevation_m": 135.98670446462154,
   "start_xy": [
    290525.45074528916,
    67508.91810842084
   ],
   "end_xy": [
    290529.8774763208,
    67506.59344664472
   ]
  },
  "min_10m": {
   "gradient_pct": -4.476751783499822,
   "start_distance_m": 397.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 402.0,
   "start_elevation_m": 136.33095239314807,
   "end_elevation_m": 135.88327721479808,
   "start_xy": [
    290524.5653990828,
    67509.38304077605
   ],
   "end_xy": [
    290533.41886114614,
    67504.73371722385
   ]
  },
  "min_20m": {
   "gradient_pct": -2.5854453781833797,
   "start_distance_m": 387.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 397.0,
   "start_elevation_m": 136.40036629043476,
   "end_elevation_m": 135.88327721479808,
   "start_xy": [
    290515.77051768755,
    67514.12794275713
   ],
   "end_xy": [
    290533.41886114614,
    67504.73371722385
   ]
  },
  "min_25m": {
   "gradient_pct": -2.056050900902733,
   "start_distance_m": 382.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 394.5,
   "start_elevation_m": 136.39728994002377,
   "end_elevation_m": 135.88327721479808,
   "start_xy": [
    290511.6899803245,
    67517.01744354943
   ],
   "end_xy": [
    290533.41886114614,
    67504.73371722385
   ]
  },
  "min_50m": {
   "gradient_pct": 2.34587718448347,
   "start_distance_m": 357.0,
   "end_distance_m": 407.0,
   "midpoint_distance_m": 382.0,
   "start_elevation_m": 134.71033862255635,
   "end_elevation_m": 135.88327721479808,
   "start_xy": [
    290491.9556532442,
    67532.27914151423
   ],
   "end_xy": [
    290533.41886114614,
    67504.73371722385
   ]
  },
  "min_100m": {
   "gradient_pct": 7.272680248815946,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 77.54249271636914,
   "end_elevation_m": 84.81517296518508,
   "start_xy": [
    290332.141,
    67825.82
   ],
   "end_xy": [
    290377.2141197625,
    67736.79812198268
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 53.66861151929072,
   "start_distance_m": 155.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 156.0,
   "start_elevation_m": 95.61715762789156,
   "end_elevation_m": 96.69052985827737,
   "start_xy": [
    290385.7366940223,
    67690.42723689404
   ],
   "end_xy": [
    290384.1808333776,
    67689.17053579424
   ]
  },
  "max_3m": {
   "gradient_pct": 52.44096827353388,
   "start_distance_m": 154.0,
   "end_distance_m": 157.0,
   "midpoint_distance_m": 155.5,
   "start_elevation_m": 95.11730081007136,
   "end_elevation_m": 96.69052985827737,
   "start_xy": [
    290386.51462434465,
    67691.05558744395
   ],
   "end_xy": [
    290384.1808333776,
    67689.17053579424
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.017,
   "obstruction_max_height_m": 3.97,
   "flagged_windows_m": []
  },
  "review": [
   "max5_over_45",
   "short_window_divergence"
  ],
  "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/SX9065.tif"
  ],
  "calculated_at": "2026-09-01T00:55:07+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": "chunk-02-260901",
  "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": [
   "SX9065.tif"
  ],
  "trimmed_from": "daccombe-hill",
  "trim_cut_m": [
   [
    0.0,
    128.3
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Barton",
  "county": "Torbay"
 }
}