{
 "ocl_version": "0.1.0",
 "name": "Spring Lane",
 "slug": "spring-lane-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.17828548668649,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 11.0,
   "end_distance_m": 13.0,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 134.7271819720309,
   "min_gradient_pct": -11.939689601128123
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.75902965270635,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 11.0,
   "end_distance_m": 14.0,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 134.99638715187837,
   "min_gradient_pct": -9.153352307625559
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.282854414965527,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 9.0,
   "end_distance_m": 14.0,
   "start_elevation_m": 133.6322444311301,
   "end_elevation_m": 134.99638715187837,
   "min_gradient_pct": -3.5522179062132864
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.558607461805252,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 46.0,
   "end_distance_m": 56.0,
   "start_elevation_m": 140.32081142588405,
   "end_elevation_m": 142.67667217206457,
   "min_gradient_pct": 0.5224116694796521
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.523474997047686,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 43.0,
   "end_distance_m": 63.0,
   "start_elevation_m": 139.713104313945,
   "end_elevation_m": 144.21779931335453,
   "min_gradient_pct": 3.298741132871328
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.931589512457094,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 39.0,
   "end_distance_m": 64.0,
   "start_elevation_m": 139.12457476846146,
   "end_elevation_m": 144.35747214657573,
   "min_gradient_pct": 4.675770181580674
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.678050019780528,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 11.0,
   "end_distance_m": 61.0,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 143.82264127218744,
   "min_gradient_pct": 4.955466810868927
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.50825405734713,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 10.0,
   "end_distance_m": 110.0,
   "start_elevation_m": 133.7830955966441,
   "end_elevation_m": 150.29134965399123,
   "min_gradient_pct": 6.048199779422134
  }
 ],
 "shape": {
  "ascent_concentration": 0.353,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 124.0,
  "shape_class": "sustained"
 },
 "length_m": 619.2431704233402,
 "start_elevation_m": 132.52982266235227,
 "end_elevation_m": 194.93875804305904,
 "endpoint_gain_m": 62.408935380706765,
 "overall_gradient_pct": 10.078259779278863,
 "accumulated_ascent_m": 63.38568605258706,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.282854414965527,
   "start_distance_m": 9.0,
   "end_distance_m": 14.0,
   "midpoint_distance_m": 11.5,
   "start_elevation_m": 133.6322444311301,
   "end_elevation_m": 134.99638715187837,
   "start_xy": [
    357341.7679577803,
    166153.16289370702
   ],
   "end_xy": [
    357343.61594185303,
    166157.80885400396
   ]
  },
  "max_10m": {
   "gradient_pct": 23.558607461805252,
   "start_distance_m": 46.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 51.0,
   "start_elevation_m": 140.32081142588405,
   "end_elevation_m": 142.67667217206457,
   "start_xy": [
    357355.44214245834,
    166187.54335807104
   ],
   "end_xy": [
    357361.14736207464,
    166195.6104155316
   ]
  },
  "max_20m": {
   "gradient_pct": 22.523474997047686,
   "start_distance_m": 43.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 53.0,
   "start_elevation_m": 139.713104313945,
   "end_elevation_m": 144.21779931335453,
   "start_xy": [
    357354.33297315874,
    166184.75593242404
   ],
   "end_xy": [
    357366.1903451558,
    166200.39042086998
   ]
  },
  "max_25m": {
   "gradient_pct": 20.931589512457094,
   "start_distance_m": 39.0,
   "end_distance_m": 64.0,
   "midpoint_distance_m": 51.5,
   "start_elevation_m": 139.12457476846146,
   "end_elevation_m": 144.35747214657573,
   "start_xy": [
    357352.8549997129,
    166181.0389992792
   ],
   "end_xy": [
    357367.0289457753,
    166200.93516759848
   ]
  },
  "max_50m": {
   "gradient_pct": 19.678050019780528,
   "start_distance_m": 11.0,
   "end_distance_m": 61.0,
   "midpoint_distance_m": 36.0,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 143.82264127218744,
   "start_xy": [
    357342.5071162608,
    166155.02129190892
   ],
   "end_xy": [
    357364.51372928644,
    166199.30002680325
   ]
  },
  "max_100m": {
   "gradient_pct": 16.50825405734713,
   "start_distance_m": 10.0,
   "end_distance_m": 110.0,
   "midpoint_distance_m": 60.0,
   "start_elevation_m": 133.7830955966441,
   "end_elevation_m": 150.29134965399123,
   "start_xy": [
    357342.137968597,
    166154.091921153
   ],
   "end_xy": [
    357409.95325417595,
    166216.60781934514
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.5522179062132864,
   "start_distance_m": 144.0,
   "end_distance_m": 149.0,
   "midpoint_distance_m": 146.5,
   "start_elevation_m": 153.96740706981933,
   "end_elevation_m": 153.78979617450867,
   "start_xy": [
    357443.24925680435,
    166220.76806787506
   ],
   "end_xy": [
    357448.2267425458,
    166220.29411503332
   ]
  },
  "min_10m": {
   "gradient_pct": 0.5224116694796521,
   "start_distance_m": 199.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 204.0,
   "start_elevation_m": 157.37659144550548,
   "end_elevation_m": 157.42883261245345,
   "start_xy": [
    357498.0013824615,
    166215.55279254698
   ],
   "end_xy": [
    357507.8033351514,
    166213.57582495868
   ]
  },
  "min_20m": {
   "gradient_pct": 3.298741132871328,
   "start_distance_m": 189.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 199.0,
   "start_elevation_m": 156.76908438587918,
   "end_elevation_m": 157.42883261245345,
   "start_xy": [
    357488.04659420426,
    166216.50212919657
   ],
   "end_xy": [
    357507.8033351514,
    166213.57582495868
   ]
  },
  "min_25m": {
   "gradient_pct": 4.675770181580674,
   "start_distance_m": 188.0,
   "end_distance_m": 213.0,
   "midpoint_distance_m": 200.5,
   "start_elevation_m": 156.67340841809568,
   "end_elevation_m": 157.84235096349084,
   "start_xy": [
    357487.0511123955,
    166216.597081649
   ],
   "end_xy": [
    357511.72148373345,
    166212.77077352998
   ]
  },
  "min_50m": {
   "gradient_pct": 4.955466810868927,
   "start_distance_m": 159.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 184.0,
   "start_elevation_m": 154.95109920701898,
   "end_elevation_m": 157.42883261245345,
   "start_xy": [
    357458.18170546036,
    166219.34611857415
   ],
   "end_xy": [
    357507.8033351514,
    166213.57582495868
   ]
  },
  "min_100m": {
   "gradient_pct": 6.048199779422134,
   "start_distance_m": 136.0,
   "end_distance_m": 236.0,
   "midpoint_distance_m": 186.0,
   "start_elevation_m": 153.4842974569492,
   "end_elevation_m": 159.53249723637134,
   "start_xy": [
    357435.28524874913,
    166221.5260686434
   ],
   "end_xy": [
    357534.24981063226,
    166208.13673169687
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.17828548668649,
   "start_distance_m": 11.0,
   "end_distance_m": 13.0,
   "midpoint_distance_m": 12.0,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 134.7271819720309,
   "start_xy": [
    357342.5071162608,
    166155.02129190892
   ],
   "end_xy": [
    357343.24593116273,
    166156.87982650773
   ]
  },
  "max_3m": {
   "gradient_pct": 33.75902965270635,
   "start_distance_m": 11.0,
   "end_distance_m": 14.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 133.98361626229718,
   "end_elevation_m": 134.99638715187837,
   "start_xy": [
    357342.5071162608,
    166155.02129190892
   ],
   "end_xy": [
    357343.61594185303,
    166157.80885400396
   ]
  }
 },
 "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": 1.84,
   "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/ST5565.tif"
  ],
  "calculated_at": "2026-08-19T18:48:03+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": [
   "ST5565.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.9% over 200 m (Terrain 50), gain 24.5 m over 258 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 1 overlapping proposal(s): east-dundry-lane ADOPTED (England launch slice 2026-08-16): clean-steep."
 },
 "area": {
  "place": "East Dundry",
  "county": "North Somerset"
 }
}