{
 "ocl_version": "0.1.0",
 "name": "Hollies Hill",
 "slug": "hollies-hill",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.433671802862534,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 430.0,
   "end_distance_m": 432.0,
   "start_elevation_m": 114.85387730815145,
   "end_elevation_m": 115.3625507442087,
   "min_gradient_pct": -24.730587539131932
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.602956098076827,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 429.0,
   "end_distance_m": 432.0,
   "start_elevation_m": 114.6244620612664,
   "end_elevation_m": 115.3625507442087,
   "min_gradient_pct": -23.37332659382933
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.968244710235638,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 427.0,
   "end_distance_m": 432.0,
   "start_elevation_m": 114.16413850869692,
   "end_elevation_m": 115.3625507442087,
   "min_gradient_pct": -21.171758726139842
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.969831328287285,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 424.0,
   "end_distance_m": 434.0,
   "start_elevation_m": 113.50500802549183,
   "end_elevation_m": 115.80199115832056,
   "min_gradient_pct": -14.839224039755123
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.68319528975657,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 417.0,
   "end_distance_m": 437.0,
   "start_elevation_m": 112.28048328735355,
   "end_elevation_m": 116.41712234530486,
   "min_gradient_pct": -9.369372671559333
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.24409870559225,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 411.0,
   "end_distance_m": 436.0,
   "start_elevation_m": 111.1647805159596,
   "end_elevation_m": 116.22580519235767,
   "min_gradient_pct": -5.058107119276372
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.272972324556093,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 386.0,
   "end_distance_m": 436.0,
   "start_elevation_m": 106.58931903007962,
   "end_elevation_m": 116.22580519235767,
   "min_gradient_pct": -1.5964498422182487
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.02769062579027,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 337.0,
   "end_distance_m": 437.0,
   "start_elevation_m": 97.38943171951459,
   "end_elevation_m": 116.41712234530486,
   "min_gradient_pct": 4.202547620640999
  }
 ],
 "shape": {
  "ascent_concentration": 0.407,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 184.0,
  "shape_class": "sustained"
 },
 "length_m": 524.1350732439703,
 "start_elevation_m": 63.04824979724165,
 "end_elevation_m": 117.68050589098563,
 "endpoint_gain_m": 54.632256093743976,
 "overall_gradient_pct": 10.42331621801508,
 "accumulated_ascent_m": 57.870471873640454,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.968244710235638,
   "start_distance_m": 427.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 429.5,
   "start_elevation_m": 114.16413850869692,
   "end_elevation_m": 115.3625507442087,
   "start_xy": [
    385226.2023514593,
    199962.52262685212
   ],
   "end_xy": [
    385226.64926118305,
    199967.50261397046
   ]
  },
  "max_10m": {
   "gradient_pct": 22.969831328287285,
   "start_distance_m": 424.0,
   "end_distance_m": 434.0,
   "midpoint_distance_m": 429.0,
   "start_elevation_m": 113.50500802549183,
   "end_elevation_m": 115.80199115832056,
   "start_xy": [
    385225.9342056251,
    199959.53463458113
   ],
   "end_xy": [
    385226.8280250725,
    199969.4946088178
   ]
  },
  "max_20m": {
   "gradient_pct": 20.68319528975657,
   "start_distance_m": 417.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 427.0,
   "start_elevation_m": 112.28048328735355,
   "end_elevation_m": 116.41712234530486,
   "start_xy": [
    385225.30853201187,
    199952.56265261542
   ],
   "end_xy": [
    385227.09617090673,
    199972.4826010888
   ]
  },
  "max_25m": {
   "gradient_pct": 20.24409870559225,
   "start_distance_m": 411.0,
   "end_distance_m": 436.0,
   "midpoint_distance_m": 423.5,
   "start_elevation_m": 111.1647805159596,
   "end_elevation_m": 116.22580519235767,
   "start_xy": [
    385224.90977211366,
    199946.57602406215
   ],
   "end_xy": [
    385227.006788962,
    199971.48660366514
   ]
  },
  "max_50m": {
   "gradient_pct": 19.272972324556093,
   "start_distance_m": 386.0,
   "end_distance_m": 436.0,
   "midpoint_distance_m": 411.0,
   "start_elevation_m": 106.58931903007962,
   "end_elevation_m": 116.22580519235767,
   "start_xy": [
    385224.7699643446,
    199921.72474563276
   ],
   "end_xy": [
    385227.006788962,
    199971.48660366514
   ]
  },
  "max_100m": {
   "gradient_pct": 19.02769062579027,
   "start_distance_m": 337.0,
   "end_distance_m": 437.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 97.38943171951459,
   "end_elevation_m": 116.41712234530486,
   "start_xy": [
    385199.38029909704,
    199888.1635602844
   ],
   "end_xy": [
    385227.09617090673,
    199972.4826010888
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -21.171758726139842,
   "start_distance_m": 519.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 521.5,
   "start_elevation_m": 118.76614358243982,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385169.6535290434,
    200028.83539418425
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  },
  "min_10m": {
   "gradient_pct": -14.839224039755123,
   "start_distance_m": 514.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 519.0,
   "start_elevation_m": 119.19147805010834,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385173.4952746779,
    200025.6352394254
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  },
  "min_20m": {
   "gradient_pct": -9.369372671559333,
   "start_distance_m": 504.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 514.0,
   "start_elevation_m": 119.5814301804447,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385181.17876594665,
    200019.23492990772
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  },
  "min_25m": {
   "gradient_pct": -5.058107119276372,
   "start_distance_m": 499.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 511.5,
   "start_elevation_m": 118.97208242595192,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385185.02051158104,
    200016.03477514887
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  },
  "min_50m": {
   "gradient_pct": -1.5964498422182487,
   "start_distance_m": 474.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 499.0,
   "start_elevation_m": 118.50578056724196,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385204.22923975304,
    200000.03400135465
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  },
  "min_100m": {
   "gradient_pct": 4.202547620640999,
   "start_distance_m": 424.0,
   "end_distance_m": 524.0,
   "midpoint_distance_m": 474.0,
   "start_elevation_m": 113.50500802549183,
   "end_elevation_m": 117.70755564613283,
   "start_xy": [
    385225.9342056251,
    199959.53463458113
   ],
   "end_xy": [
    385165.81178340904,
    200032.0355489431
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.433671802862534,
   "start_distance_m": 430.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 431.0,
   "start_elevation_m": 114.85387730815145,
   "end_elevation_m": 115.3625507442087,
   "start_xy": [
    385226.4704972936,
    199965.51061912312
   ],
   "end_xy": [
    385226.64926118305,
    199967.50261397046
   ]
  },
  "max_3m": {
   "gradient_pct": 24.602956098076827,
   "start_distance_m": 429.0,
   "end_distance_m": 432.0,
   "midpoint_distance_m": 430.5,
   "start_elevation_m": 114.6244620612664,
   "end_elevation_m": 115.3625507442087,
   "start_xy": [
    385226.3811153488,
    199964.51462169946
   ],
   "end_xy": [
    385226.64926118305,
    199967.50261397046
   ]
  }
 },
 "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": [],
  "extent": [
   "may_start_earlier",
   "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/ST8595.tif",
   "data/cache/england/bulk_dtm_1m/SO8500.tif"
  ],
  "calculated_at": "2026-09-01T04:23:12+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-04-260901",
  "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": [
   "ST8595.tif",
   "SO8500.tif"
  ],
  "canopy_check": "unavailable \u2014 surface model missing: [Errno 28] No space left on device",
  "trimmed_from": "hollies-hill",
  "trim_cut_m": [
   [
    0.0,
    74.1
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Nailsworth",
  "county": "Gloucestershire"
 }
}