{
 "ocl_version": "0.1.0",
 "name": "Peggy's Bank",
 "slug": "peggy-s-bank",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.54597915267783,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 327.0,
   "end_distance_m": 329.0,
   "start_elevation_m": 182.08070433214542,
   "end_elevation_m": 182.77162391519897,
   "min_gradient_pct": -5.240506240622267
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.418075965103753,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 326.0,
   "end_distance_m": 329.0,
   "start_elevation_m": 181.82908163624586,
   "end_elevation_m": 182.77162391519897,
   "min_gradient_pct": -2.082244810324596
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.106190353197007,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 184.0,
   "end_distance_m": 189.0,
   "start_elevation_m": 168.39815212198073,
   "end_elevation_m": 169.70346163964058,
   "min_gradient_pct": 0.42822400123270654
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.359534874363874,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 181.0,
   "end_distance_m": 191.0,
   "start_elevation_m": 167.67933311391448,
   "end_elevation_m": 170.21528660135087,
   "min_gradient_pct": 2.859974518337367
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.303823690538593,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 172.0,
   "end_distance_m": 192.0,
   "start_elevation_m": 165.5810894257289,
   "end_elevation_m": 170.4418541638366,
   "min_gradient_pct": 3.19723886454625
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 24.041700503345623,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 170.0,
   "end_distance_m": 195.0,
   "start_elevation_m": 165.141335400222,
   "end_elevation_m": 171.1517605260584,
   "min_gradient_pct": 3.6199474779928096
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.503430208956615,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 145.0,
   "end_distance_m": 195.0,
   "start_elevation_m": 159.4000454215801,
   "end_elevation_m": 171.1517605260584,
   "min_gradient_pct": 4.306759400865985
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.36679839884019,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 116.0,
   "end_distance_m": 216.0,
   "start_elevation_m": 153.89778624931552,
   "end_elevation_m": 175.2645846481557,
   "min_gradient_pct": 5.486795721699735
  }
 ],
 "shape": {
  "ascent_concentration": 0.471,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 161.0,
  "shape_class": "stepped"
 },
 "length_m": 439.5188245827569,
 "start_elevation_m": 144.00664327276456,
 "end_elevation_m": 191.97058146931454,
 "endpoint_gain_m": 47.963938196549975,
 "overall_gradient_pct": 10.912829101707532,
 "accumulated_ascent_m": 48.19496840414814,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.106190353197007,
   "start_distance_m": 184.0,
   "end_distance_m": 189.0,
   "midpoint_distance_m": 186.5,
   "start_elevation_m": 168.39815212198073,
   "end_elevation_m": 169.70346163964058,
   "start_xy": [
    380646.881508289,
    349966.91897730314
   ],
   "end_xy": [
    380651.51668013586,
    349965.0440954534
   ]
  },
  "max_10m": {
   "gradient_pct": 25.359534874363874,
   "start_distance_m": 181.0,
   "end_distance_m": 191.0,
   "midpoint_distance_m": 186.0,
   "start_elevation_m": 167.67933311391448,
   "end_elevation_m": 170.21528660135087,
   "start_xy": [
    380644.10040518094,
    349968.043906413
   ],
   "end_xy": [
    380653.37074887456,
    349964.29414271354
   ]
  },
  "max_20m": {
   "gradient_pct": 24.303823690538593,
   "start_distance_m": 172.0,
   "end_distance_m": 192.0,
   "midpoint_distance_m": 182.0,
   "start_elevation_m": 165.5810894257289,
   "end_elevation_m": 170.4418541638366,
   "start_xy": [
    380635.75709585665,
    349971.4186937425
   ],
   "end_xy": [
    380654.29778324394,
    349963.9191663436
   ]
  },
  "max_25m": {
   "gradient_pct": 24.041700503345623,
   "start_distance_m": 170.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 182.5,
   "start_elevation_m": 165.141335400222,
   "end_elevation_m": 171.1517605260584,
   "start_xy": [
    380633.90302711795,
    349972.1686464824
   ],
   "end_xy": [
    380657.078886352,
    349962.79423723376
   ]
  },
  "max_50m": {
   "gradient_pct": 23.503430208956615,
   "start_distance_m": 145.0,
   "end_distance_m": 195.0,
   "midpoint_distance_m": 170.0,
   "start_elevation_m": 159.4000454215801,
   "end_elevation_m": 171.1517605260584,
   "start_xy": [
    380610.72716788383,
    349981.54305573105
   ],
   "end_xy": [
    380657.078886352,
    349962.79423723376
   ]
  },
  "max_100m": {
   "gradient_pct": 21.36679839884019,
   "start_distance_m": 116.0,
   "end_distance_m": 216.0,
   "midpoint_distance_m": 166.0,
   "start_elevation_m": 153.89778624931552,
   "end_elevation_m": 175.2645846481557,
   "start_xy": [
    380582.1214725548,
    349985.69848544744
   ],
   "end_xy": [
    380676.5466081087,
    349954.9197334649
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 0.42822400123270654,
   "start_distance_m": 341.0,
   "end_distance_m": 346.0,
   "midpoint_distance_m": 343.5,
   "start_elevation_m": 183.9166834472289,
   "end_elevation_m": 183.93809464729054,
   "start_xy": [
    380799.71970853227,
    349934.43285550305
   ],
   "end_xy": [
    380804.65974318126,
    349933.660807793
   ]
  },
  "min_10m": {
   "gradient_pct": 2.859974518337367,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 144.00664327276456,
   "end_elevation_m": 144.2926407245983,
   "start_xy": [
    380477.144,
    349984.527
   ],
   "end_xy": [
    380486.7182844015,
    349987.413707155
   ]
  },
  "min_20m": {
   "gradient_pct": 3.19723886454625,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 144.00664327276456,
   "end_elevation_m": 144.6460910456738,
   "start_xy": [
    380477.144,
    349984.527
   ],
   "end_xy": [
    380496.29256880307,
    349990.3004143099
   ]
  },
  "min_25m": {
   "gradient_pct": 3.6199474779928096,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 144.00664327276456,
   "end_elevation_m": 144.91163014226277,
   "start_xy": [
    380477.144,
    349984.527
   ],
   "end_xy": [
    380501.0797110038,
    349991.74376788735
   ]
  },
  "min_50m": {
   "gradient_pct": 4.306759400865985,
   "start_distance_m": 251.0,
   "end_distance_m": 301.0,
   "midpoint_distance_m": 276.0,
   "start_elevation_m": 177.9971956356798,
   "end_elevation_m": 180.15057533611278,
   "start_xy": [
    380710.79908485006,
    349948.32971428364
   ],
   "end_xy": [
    380760.19943134015,
    349940.60923718335
   ]
  },
  "min_100m": {
   "gradient_pct": 5.486795721699735,
   "start_distance_m": 221.0,
   "end_distance_m": 321.0,
   "midpoint_distance_m": 271.0,
   "start_elevation_m": 175.88536448589645,
   "end_elevation_m": 181.37216020759618,
   "start_xy": [
    380681.1817799555,
    349953.04485161515
   ],
   "end_xy": [
    380779.9595699362,
    349937.5210463432
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.54597915267783,
   "start_distance_m": 327.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 328.0,
   "start_elevation_m": 182.08070433214542,
   "end_elevation_m": 182.77162391519897,
   "start_xy": [
    380785.887611515,
    349936.59458909114
   ],
   "end_xy": [
    380787.8636253746,
    349936.2857700072
   ]
  },
  "max_3m": {
   "gradient_pct": 31.418075965103753,
   "start_distance_m": 326.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 327.5,
   "start_elevation_m": 181.82908163624586,
   "end_elevation_m": 182.77162391519897,
   "start_xy": [
    380784.89960458525,
    349936.7489986332
   ],
   "end_xy": [
    380787.8636253746,
    349936.2857700072
   ]
  }
 },
 "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": 0.02,
   "obstruction_max_height_m": 6.68,
   "flagged_windows_m": []
  },
  "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/SJ8045.tif",
   "data/cache/england/bulk_dtm_1m/SJ8050.tif"
  ],
  "calculated_at": "2026-08-15T16:44:59+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",
  "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": [
   "SJ8045.tif",
   "SJ8050.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 14.4% over 200 m (Terrain 50), gain 42.4 m over 376 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."
 },
 "area": {
  "place": "Miles Green",
  "county": "Staffordshire"
 }
}