{
 "ocl_version": "0.1.0",
 "name": "Roundball Lane",
 "slug": "roundball-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 51.59278192969623,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 604.0,
   "end_distance_m": 606.0,
   "start_elevation_m": 185.87662033774427,
   "end_elevation_m": 186.9084759763382,
   "min_gradient_pct": -42.34117712739902
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 46.792189111599214,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 603.0,
   "end_distance_m": 606.0,
   "start_elevation_m": 185.50471030299022,
   "end_elevation_m": 186.9084759763382,
   "min_gradient_pct": -37.4823318106678
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 41.8452866827505,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 602.0,
   "end_distance_m": 607.0,
   "start_elevation_m": 185.1642331142466,
   "end_elevation_m": 187.25649744838412,
   "min_gradient_pct": -35.14817021756073
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 33.95146068046813,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 599.0,
   "end_distance_m": 609.0,
   "start_elevation_m": 184.3879515305233,
   "end_elevation_m": 187.78309759857012,
   "min_gradient_pct": -25.111047944656946
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.788421012561628,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 596.0,
   "end_distance_m": 616.0,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 188.72346659897767,
   "min_gradient_pct": -23.882953900842665
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.86115791274915,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 596.0,
   "end_distance_m": 621.0,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 189.48107187465263,
   "min_gradient_pct": -23.504700089746734
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.91596900319496,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 596.0,
   "end_distance_m": 646.0,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 192.72376689806282,
   "min_gradient_pct": -21.547922067248237
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.01085016904318,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 374.0,
   "end_distance_m": 474.0,
   "start_elevation_m": 153.79954475266123,
   "end_elevation_m": 169.81039492170441,
   "min_gradient_pct": -13.370978867510303,
   "suppressed_max_gradient_pct": 16.633762161680124,
   "suppressed_location_m": [
    411.0,
    511.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.382,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 148.0,
  "shape_class": "sustained"
 },
 "length_m": 1322.0459763237839,
 "start_elevation_m": 118.68203024330066,
 "end_elevation_m": 215.60897988525412,
 "endpoint_gain_m": 96.92694964195346,
 "overall_gradient_pct": 7.331586902255732,
 "accumulated_ascent_m": 122.43715017672918,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 41.8452866827505,
   "start_distance_m": 602.0,
   "end_distance_m": 607.0,
   "midpoint_distance_m": 604.5,
   "start_elevation_m": 185.1642331142466,
   "end_elevation_m": 187.25649744838412,
   "start_xy": [
    315626.38974498713,
    98923.32237158045
   ],
   "end_xy": [
    315621.44710705924,
    98922.56717031679
   ]
  },
  "max_10m": {
   "gradient_pct": 33.95146068046813,
   "start_distance_m": 599.0,
   "end_distance_m": 609.0,
   "midpoint_distance_m": 604.0,
   "start_elevation_m": 184.3879515305233,
   "end_elevation_m": 187.78309759857012,
   "start_xy": [
    315629.3553376299,
    98923.77542811954
   ],
   "end_xy": [
    315619.47015756223,
    98922.26440059907
   ]
  },
  "max_20m": {
   "gradient_pct": 24.788421012561628,
   "start_distance_m": 596.0,
   "end_distance_m": 616.0,
   "midpoint_distance_m": 606.0,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 188.72346659897767,
   "start_xy": [
    315632.3207932454,
    98924.22937894848
   ],
   "end_xy": [
    315612.5504329537,
    98921.20732393934
   ]
  },
  "max_25m": {
   "gradient_pct": 22.86115791274915,
   "start_distance_m": 596.0,
   "end_distance_m": 621.0,
   "midpoint_distance_m": 608.5,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 189.48107187465263,
   "start_xy": [
    315632.3207932454,
    98924.22937894848
   ],
   "end_xy": [
    315607.60790643824,
    98920.45139623071
   ]
  },
  "max_50m": {
   "gradient_pct": 17.91596900319496,
   "start_distance_m": 596.0,
   "end_distance_m": 646.0,
   "midpoint_distance_m": 621.0,
   "start_elevation_m": 183.76578239646534,
   "end_elevation_m": 192.72376689806282,
   "start_xy": [
    315632.3207932454,
    98924.22937894848
   ],
   "end_xy": [
    315582.89490825334,
    98916.67413973129
   ]
  },
  "max_100m": {
   "gradient_pct": 16.01085016904318,
   "start_distance_m": 374.0,
   "end_distance_m": 474.0,
   "midpoint_distance_m": 424.0,
   "start_elevation_m": 153.79954475266123,
   "end_elevation_m": 169.81039492170441,
   "start_xy": [
    315837.9271216334,
    98988.29466580869
   ],
   "end_xy": [
    315742.6471333479,
    98975.61954661444
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -35.14817021756073,
   "start_distance_m": 678.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 680.5,
   "start_elevation_m": 193.51840567125024,
   "end_elevation_m": 191.7609971603722,
   "start_xy": [
    315551.5083630541,
    98917.2648094176
   ],
   "end_xy": [
    315546.66299050103,
    98918.49864948013
   ]
  },
  "min_10m": {
   "gradient_pct": -25.111047944656946,
   "start_distance_m": 675.0,
   "end_distance_m": 685.0,
   "midpoint_distance_m": 680.0,
   "start_elevation_m": 193.98902724264775,
   "end_elevation_m": 191.47792244818206,
   "start_xy": [
    315554.4156455552,
    98916.52473740751
   ],
   "end_xy": [
    315544.72472253523,
    98918.99171778513
   ]
  },
  "min_20m": {
   "gradient_pct": -23.882953900842665,
   "start_distance_m": 737.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 747.0,
   "start_elevation_m": 189.66010210921291,
   "end_elevation_m": 184.88351132904438,
   "start_xy": [
    315507.55600484664,
    98954.50823209893
   ],
   "end_xy": [
    315491.17559670145,
    98965.91319002921
   ]
  },
  "min_25m": {
   "gradient_pct": -23.504700089746734,
   "start_distance_m": 732.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 744.5,
   "start_elevation_m": 190.75968635148107,
   "end_elevation_m": 184.88351132904438,
   "start_xy": [
    315511.36362756527,
    98951.26755293664
   ],
   "end_xy": [
    315491.17559670145,
    98965.91319002921
   ]
  },
  "min_50m": {
   "gradient_pct": -21.547922067248237,
   "start_distance_m": 735.0,
   "end_distance_m": 785.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 190.1080152513104,
   "end_elevation_m": 179.3340542176863,
   "start_xy": [
    315509.07916760823,
    98953.2120936875
   ],
   "end_xy": [
    315467.51326229813,
    98980.88295227279
   ]
  },
  "min_100m": {
   "gradient_pct": -13.370978867510303,
   "start_distance_m": 715.0,
   "end_distance_m": 815.0,
   "midpoint_distance_m": 765.0,
   "start_elevation_m": 191.67865541587162,
   "end_elevation_m": 178.30767654836131,
   "start_xy": [
    315524.25462092797,
    98940.19179436774
   ],
   "end_xy": [
    315452.61741290404,
    98980.68884674867
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 51.59278192969623,
   "start_distance_m": 604.0,
   "end_distance_m": 606.0,
   "midpoint_distance_m": 605.0,
   "start_elevation_m": 185.87662033774427,
   "end_elevation_m": 186.9084759763382,
   "start_xy": [
    315624.41267900635,
    98923.02036150654
   ],
   "end_xy": [
    315622.43561302556,
    98922.7183514326
   ]
  },
  "max_3m": {
   "gradient_pct": 46.792189111599214,
   "start_distance_m": 603.0,
   "end_distance_m": 606.0,
   "midpoint_distance_m": 604.5,
   "start_elevation_m": 185.50471030299022,
   "end_elevation_m": 186.9084759763382,
   "start_xy": [
    315625.40120567137,
    98923.1714079518
   ],
   "end_xy": [
    315622.43561302556,
    98922.7183514326
   ]
  }
 },
 "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": 0.094,
   "obstruction_max_height_m": 15.82,
   "flagged_windows_m": [
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.009,
   "windows_resited": [
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    507.0,
    512.0
   ],
   [
    676.0,
    681.0
   ]
  ],
  "review": [],
  "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/SY1595.tif"
  ],
  "calculated_at": "2026-08-19T18:45:41+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": [
   "SY1595.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.9% over 200 m (Terrain 50), gain 59.3 m over 804 m way. EXTENDED by graph walk: +0 segment(s) at base, +4 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": "Littletown",
  "county": "Devon"
 }
}