{
 "ocl_version": "0.1.0",
 "name": "Seller's Wood Hill",
 "slug": "seller-s-wood-hill",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 49.13638909973699,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1050.0,
   "end_distance_m": 1052.0,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 73.70466051561067,
   "min_gradient_pct": -29.847541843443537
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 47.184598280190926,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1050.0,
   "end_distance_m": 1053.0,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 74.13747068202166,
   "min_gradient_pct": -23.86786826172435
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.765026840936798,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1050.0,
   "end_distance_m": 1055.0,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 74.16018407566277,
   "min_gradient_pct": -22.52506760566149
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.354303543448793,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1301.0,
   "end_distance_m": 1311.0,
   "start_elevation_m": 111.01054277237537,
   "end_elevation_m": 113.34597312672025,
   "min_gradient_pct": -16.46714297242397
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.155287122138446,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1291.0,
   "end_distance_m": 1311.0,
   "start_elevation_m": 109.11491570229256,
   "end_elevation_m": 113.34597312672025,
   "min_gradient_pct": -11.531188534200005
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.85411484027014,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1331.0,
   "end_distance_m": 1356.0,
   "start_elevation_m": 116.84544616095415,
   "end_elevation_m": 122.05897487102169,
   "min_gradient_pct": -10.433756308345297
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.076109851106025,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1305.0,
   "end_distance_m": 1355.0,
   "start_elevation_m": 111.83365066062683,
   "end_elevation_m": 121.87170558617984,
   "min_gradient_pct": -9.538941273132792
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.956948016679362,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1262.0,
   "end_distance_m": 1362.0,
   "start_elevation_m": 104.13552670257829,
   "end_elevation_m": 123.09247471925765,
   "min_gradient_pct": -5.46254547794696
  }
 ],
 "shape": {
  "ascent_concentration": 0.533,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 184.0,
  "shape_class": "stepped"
 },
 "length_m": 1914.4947201728962,
 "start_elevation_m": 27.333672341873292,
 "end_elevation_m": 145.62889736816396,
 "endpoint_gain_m": 118.29522502629067,
 "overall_gradient_pct": 6.178926678659502,
 "accumulated_ascent_m": 135.78094824287064,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.765026840936798,
   "start_distance_m": 1050.0,
   "end_distance_m": 1055.0,
   "midpoint_distance_m": 1052.5,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 74.16018407566277,
   "start_xy": [
    320379.3883927528,
    89797.33503499067
   ],
   "end_xy": [
    320380.34295255085,
    89802.24307055255
   ]
  },
  "max_10m": {
   "gradient_pct": 23.354303543448793,
   "start_distance_m": 1301.0,
   "end_distance_m": 1311.0,
   "midpoint_distance_m": 1306.0,
   "start_elevation_m": 111.01054277237537,
   "end_elevation_m": 113.34597312672025,
   "start_xy": [
    320413.9437777016,
    90044.96997337078
   ],
   "end_xy": [
    320417.43593515636,
    90054.34039610748
   ]
  },
  "max_20m": {
   "gradient_pct": 21.155287122138446,
   "start_distance_m": 1291.0,
   "end_distance_m": 1311.0,
   "midpoint_distance_m": 1301.0,
   "start_elevation_m": 109.11491570229256,
   "end_elevation_m": 113.34597312672025,
   "start_xy": [
    320410.45194735634,
    90035.59942886209
   ],
   "end_xy": [
    320417.43593515636,
    90054.34039610748
   ]
  },
  "max_25m": {
   "gradient_pct": 20.85411484027014,
   "start_distance_m": 1331.0,
   "end_distance_m": 1356.0,
   "midpoint_distance_m": 1343.5,
   "start_elevation_m": 116.84544616095415,
   "end_elevation_m": 122.05897487102169,
   "start_xy": [
    320423.63211599743,
    90073.24045706955
   ],
   "end_xy": [
    320424.5185669599,
    90098.22473313766
   ]
  },
  "max_50m": {
   "gradient_pct": 20.076109851106025,
   "start_distance_m": 1305.0,
   "end_distance_m": 1355.0,
   "midpoint_distance_m": 1330.0,
   "start_elevation_m": 111.83365066062683,
   "end_elevation_m": 121.87170558617984,
   "start_xy": [
    320415.34081628703,
    90048.71807696554
   ],
   "end_xy": [
    320424.483112669,
    90097.22536197172
   ]
  },
  "max_100m": {
   "gradient_pct": 18.956948016679362,
   "start_distance_m": 1262.0,
   "end_distance_m": 1362.0,
   "midpoint_distance_m": 1312.0,
   "start_elevation_m": 104.13552670257829,
   "end_elevation_m": 123.09247471925765,
   "start_xy": [
    320403.9714440399,
    90007.53574518324
   ],
   "end_xy": [
    320424.73111494276,
    90104.22096650807
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -22.52506760566149,
   "start_distance_m": 617.0,
   "end_distance_m": 622.0,
   "midpoint_distance_m": 619.5,
   "start_elevation_m": 53.90369722720174,
   "end_elevation_m": 52.777443846918665,
   "start_xy": [
    320216.5503124357,
    89405.14193159986
   ],
   "end_xy": [
    320218.6610408198,
    89409.67457114584
   ]
  },
  "min_10m": {
   "gradient_pct": -16.46714297242397,
   "start_distance_m": 616.0,
   "end_distance_m": 626.0,
   "midpoint_distance_m": 621.0,
   "start_elevation_m": 53.99785300735957,
   "end_elevation_m": 52.351138710117176,
   "start_xy": [
    320216.12799926795,
    89404.23548183899
   ],
   "end_xy": [
    320220.35000909155,
    89413.30050295267
   ]
  },
  "min_20m": {
   "gradient_pct": -11.531188534200005,
   "start_distance_m": 615.0,
   "end_distance_m": 635.0,
   "midpoint_distance_m": 625.0,
   "start_elevation_m": 54.05432566205996,
   "end_elevation_m": 51.74808795521996,
   "start_xy": [
    320215.70591996185,
    89403.32892295122
   ],
   "end_xy": [
    320224.1499399501,
    89421.45896586441
   ]
  },
  "min_25m": {
   "gradient_pct": -10.433756308345297,
   "start_distance_m": 443.0,
   "end_distance_m": 468.0,
   "midpoint_distance_m": 455.5,
   "start_elevation_m": 52.68905288972586,
   "end_elevation_m": 50.080613812639534,
   "start_xy": [
    320220.92555447994,
    89241.04420369417
   ],
   "end_xy": [
    320219.74377604737,
    89266.01077514759
   ]
  },
  "min_50m": {
   "gradient_pct": -9.538941273132792,
   "start_distance_m": 615.0,
   "end_distance_m": 665.0,
   "midpoint_distance_m": 640.0,
   "start_elevation_m": 54.05432566205996,
   "end_elevation_m": 49.28485502549356,
   "start_xy": [
    320215.70591996185,
    89403.32892295122
   ],
   "end_xy": [
    320236.8149997851,
    89448.65448295043
   ]
  },
  "min_100m": {
   "gradient_pct": -5.46254547794696,
   "start_distance_m": 419.0,
   "end_distance_m": 519.0,
   "midpoint_distance_m": 469.0,
   "start_elevation_m": 52.705550165364045,
   "end_elevation_m": 47.243004687417084,
   "start_xy": [
    320231.8628460996,
    89219.86775416104
   ],
   "end_xy": [
    320205.000761641,
    89313.51130389952
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 49.13638909973699,
   "start_distance_m": 1050.0,
   "end_distance_m": 1052.0,
   "midpoint_distance_m": 1051.0,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 73.70466051561067,
   "start_xy": [
    320379.3883927528,
    89797.33503499067
   ],
   "end_xy": [
    320379.7704264982,
    89799.29820848806
   ]
  },
  "max_3m": {
   "gradient_pct": 47.184598280190926,
   "start_distance_m": 1050.0,
   "end_distance_m": 1053.0,
   "midpoint_distance_m": 1051.5,
   "start_elevation_m": 72.72193273361593,
   "end_elevation_m": 74.13747068202166,
   "start_xy": [
    320379.3883927528,
    89797.33503499067
   ],
   "end_xy": [
    320379.96134966705,
    89800.27981347154
   ]
  }
 },
 "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": 0.086,
   "obstruction_max_height_m": 18.64,
   "flagged_windows_m": [
    2,
    3,
    5
   ]
  },
  "review": [],
  "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/SY2085.tif",
   "data/cache/england/bulk_dtm_1m/SY2090.tif"
  ],
  "calculated_at": "2026-08-19T18:46:35+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/england-2026-08-12.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": [
   "SY2085.tif",
   "SY2090.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 17.0% over 200 m (Terrain 50), gain 76.3 m over 680 m way. EXTENDED by graph walk: +2 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "Branscombe",
  "county": "Devon"
 }
}