{
 "ocl_version": "0.1.0",
 "name": "Hudson Lane",
 "slug": "hudson-lane",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.976175307828385,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 402.0,
   "end_distance_m": 404.0,
   "start_elevation_m": 177.60395617582202,
   "end_elevation_m": 178.0834796819786,
   "min_gradient_pct": 0.7107448135130312
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.29146630786454,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 389.0,
   "end_distance_m": 392.0,
   "start_elevation_m": 175.0650924873952,
   "end_elevation_m": 175.76383647663113,
   "min_gradient_pct": 1.9111317082556905
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.60281366417189,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 387.0,
   "end_distance_m": 392.0,
   "start_elevation_m": 174.63369579342253,
   "end_elevation_m": 175.76383647663113,
   "min_gradient_pct": 2.0927836305412484
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.05649851550163,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 382.0,
   "end_distance_m": 392.0,
   "start_elevation_m": 173.55818662508096,
   "end_elevation_m": 175.76383647663113,
   "min_gradient_pct": 2.614819976738829
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.93513726908853,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 377.0,
   "end_distance_m": 397.0,
   "start_elevation_m": 172.53254215321132,
   "end_elevation_m": 176.71956960702903,
   "min_gradient_pct": 2.8051808723789406
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.642509710575382,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 375.0,
   "end_distance_m": 400.0,
   "start_elevation_m": 172.1616579172734,
   "end_elevation_m": 177.32228534491725,
   "min_gradient_pct": 2.8312580535579173
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.613386504930702,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 373.0,
   "end_distance_m": 423.0,
   "start_elevation_m": 171.78309877180928,
   "end_elevation_m": 181.58979202427463,
   "min_gradient_pct": 3.201012634539609
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.430215714458512,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 323.0,
   "end_distance_m": 423.0,
   "start_elevation_m": 163.15957630981612,
   "end_elevation_m": 181.58979202427463,
   "min_gradient_pct": 5.579846755419112
  }
 ],
 "shape": {
  "ascent_concentration": 0.422,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 221.0,
  "shape_class": "sustained"
 },
 "length_m": 438.3870529820533,
 "start_elevation_m": 136.0255867193615,
 "end_elevation_m": 183.42231560400387,
 "endpoint_gain_m": 47.39672888464236,
 "overall_gradient_pct": 10.811616940380466,
 "accumulated_ascent_m": 47.400717703951074,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.60281366417189,
   "start_distance_m": 387.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 389.5,
   "start_elevation_m": 174.63369579342253,
   "end_elevation_m": 175.76383647663113,
   "start_xy": [
    365283.53385451064,
    211983.01603134722
   ],
   "end_xy": [
    365288.2376152032,
    211981.3205573285
   ]
  },
  "max_10m": {
   "gradient_pct": 22.05649851550163,
   "start_distance_m": 382.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 173.55818662508096,
   "end_elevation_m": 175.76383647663113,
   "start_xy": [
    365279.30120953836,
    211985.56337724964
   ],
   "end_xy": [
    365288.2376152032,
    211981.3205573285
   ]
  },
  "max_20m": {
   "gradient_pct": 20.93513726908853,
   "start_distance_m": 377.0,
   "end_distance_m": 397.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 172.53254215321132,
   "end_elevation_m": 176.71956960702903,
   "start_xy": [
    365275.45629937644,
    211988.75972873744
   ],
   "end_xy": [
    365292.94155485433,
    211979.62557906948
   ]
  },
  "max_25m": {
   "gradient_pct": 20.642509710575382,
   "start_distance_m": 375.0,
   "end_distance_m": 400.0,
   "midpoint_distance_m": 387.5,
   "start_elevation_m": 172.1616579172734,
   "end_elevation_m": 177.32228534491725,
   "start_xy": [
    365273.9187455947,
    211990.03876276332
   ],
   "end_xy": [
    365295.7639199997,
    211978.60859587244
   ]
  },
  "max_50m": {
   "gradient_pct": 19.613386504930702,
   "start_distance_m": 373.0,
   "end_distance_m": 423.0,
   "midpoint_distance_m": 398.0,
   "start_elevation_m": 171.78309877180928,
   "end_elevation_m": 181.58979202427463,
   "start_xy": [
    365272.38099276903,
    211991.317557374
   ],
   "end_xy": [
    365317.43275252887,
    211970.94404603905
   ]
  },
  "max_100m": {
   "gradient_pct": 18.430215714458512,
   "start_distance_m": 323.0,
   "end_distance_m": 423.0,
   "midpoint_distance_m": 373.0,
   "start_elevation_m": 163.15957630981612,
   "end_elevation_m": 181.58979202427463,
   "start_xy": [
    365228.2408401483,
    212011.69676311736
   ],
   "end_xy": [
    365317.43275252887,
    211970.94404603905
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.0927836305412484,
   "start_distance_m": 213.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 215.5,
   "start_elevation_m": 148.43250511756423,
   "end_elevation_m": 148.5371442990913,
   "start_xy": [
    365122.87260204385,
    212031.13451697797
   ],
   "end_xy": [
    365126.36657092057,
    212033.31416548137
   ]
  },
  "min_10m": {
   "gradient_pct": 2.614819976738829,
   "start_distance_m": 208.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 213.0,
   "start_elevation_m": 148.2756623014174,
   "end_elevation_m": 148.5371442990913,
   "start_xy": [
    365120.37759782845,
    212026.80150965383
   ],
   "end_xy": [
    365126.36657092057,
    212033.31416548137
   ]
  },
  "min_20m": {
   "gradient_pct": 2.8051808723789406,
   "start_distance_m": 198.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 208.0,
   "start_elevation_m": 147.9761081246155,
   "end_elevation_m": 148.5371442990913,
   "start_xy": [
    365115.38758939767,
    212018.13549500558
   ],
   "end_xy": [
    365126.36657092057,
    212033.31416548137
   ]
  },
  "min_25m": {
   "gradient_pct": 2.8312580535579173,
   "start_distance_m": 193.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 205.5,
   "start_elevation_m": 147.82932978570182,
   "end_elevation_m": 148.5371442990913,
   "start_xy": [
    365112.8925851823,
    212013.80248768145
   ],
   "end_xy": [
    365126.36657092057,
    212033.31416548137
   ]
  },
  "min_50m": {
   "gradient_pct": 3.201012634539609,
   "start_distance_m": 169.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 194.0,
   "start_elevation_m": 146.99563839427256,
   "end_elevation_m": 148.59614471154237,
   "start_xy": [
    365098.33548089606,
    212001.30570490018
   ],
   "end_xy": [
    365127.31435058743,
    212032.995239623
   ]
  },
  "min_100m": {
   "gradient_pct": 5.579846755419112,
   "start_distance_m": 22.0,
   "end_distance_m": 122.0,
   "midpoint_distance_m": 72.0,
   "start_elevation_m": 137.37238592383522,
   "end_elevation_m": 142.95223267925434,
   "start_xy": [
    365094.5169983224,
    212144.85015251042
   ],
   "end_xy": [
    365090.9119814494,
    212044.9443129403
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.976175307828385,
   "start_distance_m": 402.0,
   "end_distance_m": 404.0,
   "midpoint_distance_m": 403.0,
   "start_elevation_m": 177.60395617582202,
   "end_elevation_m": 178.0834796819786,
   "start_xy": [
    365297.6454945055,
    211977.93060081045
   ],
   "end_xy": [
    365299.5270487191,
    211977.25254945128
   ]
  },
  "max_3m": {
   "gradient_pct": 23.29146630786454,
   "start_distance_m": 389.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 390.5,
   "start_elevation_m": 175.0650924873952,
   "end_elevation_m": 175.76383647663113,
   "start_xy": [
    365285.4152973841,
    211982.33767182444
   ],
   "end_xy": [
    365288.2376152032,
    211981.3205573285
   ]
  }
 },
 "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": 0.0,
   "obstruction_max_height_m": 0.86,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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/SO6510.tif"
  ],
  "calculated_at": "2026-08-19T18:37:44+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": [
   "SO6510.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.9% over 200 m (Terrain 50), gain 35.6 m over 222 m way. EXTENDED by graph walk: +3 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): clean-steep."
 },
 "area": {
  "place": "Ruspidge",
  "county": "Gloucestershire"
 }
}