{
 "ocl_version": "0.1.0",
 "name": "Penhurst Lane",
 "slug": "penhurst-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 38.44061834339598,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2478.0,
   "end_distance_m": 2480.0,
   "start_elevation_m": 104.22304960495666,
   "end_elevation_m": 104.99186197182458,
   "min_gradient_pct": -39.27967302484987,
   "suppressed_max_gradient_pct": 63.195168028070725,
   "suppressed_location_m": [
    2469.0,
    2471.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.03713417429878,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 594.0,
   "end_distance_m": 597.0,
   "start_elevation_m": 50.571276850554234,
   "end_elevation_m": 51.6523908757832,
   "min_gradient_pct": -36.21522660429098,
   "suppressed_max_gradient_pct": 56.22072153038763,
   "suppressed_location_m": [
    2468.0,
    2471.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 34.931135207789765,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 594.0,
   "end_distance_m": 599.0,
   "start_elevation_m": 50.571276850554234,
   "end_elevation_m": 52.31783361094372,
   "min_gradient_pct": -23.257942467119932,
   "suppressed_max_gradient_pct": 46.855677501743,
   "suppressed_location_m": [
    2467.0,
    2472.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 33.003415064579045,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 590.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 49.25845624694777,
   "end_elevation_m": 52.55879775340568,
   "min_gradient_pct": -14.207663553223213,
   "suppressed_max_gradient_pct": 35.291163835220516,
   "suppressed_location_m": [
    2463.0,
    2473.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 29.21068378686016,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 580.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 46.716660996033646,
   "end_elevation_m": 52.55879775340568,
   "min_gradient_pct": -12.623307013864498
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 27.116817780334433,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 575.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 45.77959330832207,
   "end_elevation_m": 52.55879775340568,
   "min_gradient_pct": -12.499076219720166
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.00333747531357,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 552.0,
   "end_distance_m": 602.0,
   "start_elevation_m": 42.849390707332205,
   "end_elevation_m": 52.85105944498899,
   "min_gradient_pct": -11.120243664224475
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.053573943819814,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 500.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 36.505223809585864,
   "end_elevation_m": 52.55879775340568,
   "min_gradient_pct": -9.861162374005367
  }
 ],
 "shape": {
  "ascent_concentration": 0.429,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 51.0,
  "shape_class": "sustained"
 },
 "length_m": 2673.9921462794573,
 "start_elevation_m": 53.977794801329544,
 "end_elevation_m": 111.17429825445339,
 "endpoint_gain_m": 57.196503453123846,
 "overall_gradient_pct": 2.1389929485285135,
 "accumulated_ascent_m": 119.9533206416817,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 34.931135207789765,
   "start_distance_m": 594.0,
   "end_distance_m": 599.0,
   "midpoint_distance_m": 596.5,
   "start_elevation_m": 50.571276850554234,
   "end_elevation_m": 52.31783361094372,
   "start_xy": [
    569828.1592519637,
    116261.30040126474
   ],
   "end_xy": [
    569833.1008378429,
    116260.53834965627
   ]
  },
  "max_10m": {
   "gradient_pct": 33.003415064579045,
   "start_distance_m": 590.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 595.0,
   "start_elevation_m": 49.25845624694777,
   "end_elevation_m": 52.55879775340568,
   "start_xy": [
    569824.9023416588,
    116263.55208912466
   ],
   "end_xy": [
    569834.0891142394,
    116260.38567473239
   ]
  },
  "max_20m": {
   "gradient_pct": 29.21068378686016,
   "start_distance_m": 580.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 590.0,
   "start_elevation_m": 46.716660996033646,
   "end_elevation_m": 52.55879775340568,
   "start_xy": [
    569817.4040170732,
    116270.0764845491
   ],
   "end_xy": [
    569834.0891142394,
    116260.38567473239
   ]
  },
  "max_25m": {
   "gradient_pct": 27.116817780334433,
   "start_distance_m": 575.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 587.5,
   "start_elevation_m": 45.77959330832207,
   "end_elevation_m": 52.55879775340568,
   "start_xy": [
    569815.501835264,
    116274.6997308898
   ],
   "end_xy": [
    569834.0891142394,
    116260.38567473239
   ]
  },
  "max_50m": {
   "gradient_pct": 20.00333747531357,
   "start_distance_m": 552.0,
   "end_distance_m": 602.0,
   "midpoint_distance_m": 577.0,
   "start_elevation_m": 42.849390707332205,
   "end_elevation_m": 52.85105944498899,
   "start_xy": [
    569812.48498742,
    116297.22008023213
   ],
   "end_xy": [
    569836.0658254244,
    116260.08135157742
   ]
  },
  "max_100m": {
   "gradient_pct": 16.053573943819814,
   "start_distance_m": 500.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 550.0,
   "start_elevation_m": 36.505223809585864,
   "end_elevation_m": 52.55879775340568,
   "start_xy": [
    569811.4552237556,
    116348.87826830192
   ],
   "end_xy": [
    569834.0891142394,
    116260.38567473239
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -23.257942467119932,
   "start_distance_m": 605.0,
   "end_distance_m": 610.0,
   "midpoint_distance_m": 607.5,
   "start_elevation_m": 52.85800989576632,
   "end_elevation_m": 51.695112772410326,
   "start_xy": [
    569839.030813006,
    116259.62435349857
   ],
   "end_xy": [
    569843.9713287201,
    116258.94605758222
   ]
  },
  "min_10m": {
   "gradient_pct": -14.207663553223213,
   "start_distance_m": 1217.0,
   "end_distance_m": 1227.0,
   "midpoint_distance_m": 1222.0,
   "start_elevation_m": 30.890383123645965,
   "end_elevation_m": 29.469616768323643,
   "start_xy": [
    570428.3196682131,
    116329.3797369051
   ],
   "end_xy": [
    570437.5534095537,
    116325.61064891667
   ]
  },
  "min_20m": {
   "gradient_pct": -12.623307013864498,
   "start_distance_m": 885.0,
   "end_distance_m": 905.0,
   "midpoint_distance_m": 895.0,
   "start_elevation_m": 49.76239481178625,
   "end_elevation_m": 47.23773340901335,
   "start_xy": [
    570099.9653549636,
    116337.0976146414
   ],
   "end_xy": [
    570119.9335050235,
    116336.02549777183
   ]
  },
  "min_25m": {
   "gradient_pct": -12.499076219720166,
   "start_distance_m": 879.0,
   "end_distance_m": 904.0,
   "midpoint_distance_m": 891.5,
   "start_elevation_m": 50.47345332349683,
   "end_elevation_m": 47.348684268566785,
   "start_xy": [
    570093.9753988292,
    116337.44463049842
   ],
   "end_xy": [
    570118.9340086781,
    116336.01346139197
   ]
  },
  "min_50m": {
   "gradient_pct": -11.120243664224475,
   "start_distance_m": 395.0,
   "end_distance_m": 445.0,
   "midpoint_distance_m": 420.0,
   "start_elevation_m": 42.24331275612005,
   "end_elevation_m": 36.68319092400781,
   "start_xy": [
    569716.631138913,
    116381.70752203683
   ],
   "end_xy": [
    569762.5091196046,
    116366.81642731956
   ]
  },
  "min_100m": {
   "gradient_pct": -9.861162374005367,
   "start_distance_m": 1150.0,
   "end_distance_m": 1250.0,
   "midpoint_distance_m": 1200.0,
   "start_elevation_m": 36.879793070036406,
   "end_elevation_m": 27.01863069603104,
   "start_xy": [
    570363.7784498687,
    116347.02821802454
   ],
   "end_xy": [
    570458.2499494135,
    116315.57804455586
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 38.44061834339598,
   "start_distance_m": 2478.0,
   "end_distance_m": 2480.0,
   "midpoint_distance_m": 2479.0,
   "start_elevation_m": 104.22304960495666,
   "end_elevation_m": 104.99186197182458,
   "start_xy": [
    571005.3365009155,
    115520.15165314014
   ],
   "end_xy": [
    571006.4810470174,
    115518.51152700302
   ]
  },
  "max_3m": {
   "gradient_pct": 36.03713417429878,
   "start_distance_m": 594.0,
   "end_distance_m": 597.0,
   "midpoint_distance_m": 595.5,
   "start_elevation_m": 50.571276850554234,
   "end_elevation_m": 51.6523908757832,
   "start_xy": [
    569828.1592519637,
    116261.30040126474
   ],
   "end_xy": [
    569831.1242393967,
    116260.84340321085
   ]
  }
 },
 "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": 0.041,
   "obstruction_max_height_m": 18.24,
   "flagged_windows_m": [
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.003,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    2467.0,
    2473.0
   ]
  ],
  "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/TQ6515.tif",
   "data/cache/england/bulk_dtm_1m/TQ7015.tif"
  ],
  "calculated_at": "2026-08-19T18:43:42+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": [
   "TQ6515.tif",
   "TQ7015.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.9% over 200 m (Terrain 50), gain 55.9 m over 2641 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 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): qualified-steep."
 },
 "area": {
  "place": "Penhurst",
  "county": "East Sussex"
 }
}