{
 "ocl_version": "0.1.0",
 "name": "Smalldean Lane",
 "slug": "smalldean-lane",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.31825614071721,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 514.0,
   "end_distance_m": 516.0,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.35888626839142,
   "min_gradient_pct": -14.075018246704474
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.879735529834495,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 514.0,
   "end_distance_m": 517.0,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.5389132114721,
   "min_gradient_pct": -10.462612832911114
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.556978009278396,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 514.0,
   "end_distance_m": 519.0,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.930370046041,
   "min_gradient_pct": -6.923202784449245
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.50324099416372,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 535.0,
   "end_distance_m": 545.0,
   "start_elevation_m": 169.4569523180821,
   "end_elevation_m": 171.50727641749847,
   "min_gradient_pct": -3.8094590533211203
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.33967369489119,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 539.0,
   "end_distance_m": 559.0,
   "start_elevation_m": 170.2508040616578,
   "end_elevation_m": 174.31873880063603,
   "min_gradient_pct": -2.860798414929775
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.26975494833016,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 537.0,
   "end_distance_m": 562.0,
   "start_elevation_m": 169.84040674096119,
   "end_elevation_m": 174.90784547804373,
   "min_gradient_pct": -2.706059446082236
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.643220099041002,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 534.0,
   "end_distance_m": 584.0,
   "start_elevation_m": 169.28005088599335,
   "end_elevation_m": 179.10166093551385,
   "min_gradient_pct": -1.7443293612313369
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.68409079017266,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 534.0,
   "end_distance_m": 634.0,
   "start_elevation_m": 169.28005088599335,
   "end_elevation_m": 187.964141676166,
   "min_gradient_pct": -1.0623216979056451
  }
 ],
 "shape": {
  "ascent_concentration": 0.553,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 242.0,
  "shape_class": "stepped"
 },
 "length_m": 941.9608332067729,
 "start_elevation_m": 135.0444106025695,
 "end_elevation_m": 199.56589154219054,
 "endpoint_gain_m": 64.52148093962103,
 "overall_gradient_pct": 6.849698911574353,
 "accumulated_ascent_m": 66.84891058196035,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.556978009278396,
   "start_distance_m": 514.0,
   "end_distance_m": 519.0,
   "midpoint_distance_m": 516.5,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.930370046041,
   "start_xy": [
    482483.834754283,
    199167.41494554485
   ],
   "end_xy": [
    482487.990105926,
    199170.1957822397
   ]
  },
  "max_10m": {
   "gradient_pct": 20.50324099416372,
   "start_distance_m": 535.0,
   "end_distance_m": 545.0,
   "midpoint_distance_m": 540.0,
   "start_elevation_m": 169.4569523180821,
   "end_elevation_m": 171.50727641749847,
   "start_xy": [
    482502.1427622034,
    199177.6082030928
   ],
   "end_xy": [
    482511.1260517128,
    199182.0014376177
   ]
  },
  "max_20m": {
   "gradient_pct": 20.33967369489119,
   "start_distance_m": 539.0,
   "end_distance_m": 559.0,
   "midpoint_distance_m": 549.0,
   "start_elevation_m": 170.2508040616578,
   "end_elevation_m": 174.31873880063603,
   "start_xy": [
    482505.73607800715,
    199179.36549690276
   ],
   "end_xy": [
    482523.7026570259,
    199188.15196595257
   ]
  },
  "max_25m": {
   "gradient_pct": 20.26975494833016,
   "start_distance_m": 537.0,
   "end_distance_m": 562.0,
   "midpoint_distance_m": 549.5,
   "start_elevation_m": 169.84040674096119,
   "end_elevation_m": 174.90784547804373,
   "start_xy": [
    482503.9394201053,
    199178.48684999777
   ],
   "end_xy": [
    482526.3976438787,
    199189.46993631002
   ]
  },
  "max_50m": {
   "gradient_pct": 19.643220099041002,
   "start_distance_m": 534.0,
   "end_distance_m": 584.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 169.28005088599335,
   "end_elevation_m": 179.10166093551385,
   "start_xy": [
    482501.2444332525,
    199177.1688796403
   ],
   "end_xy": [
    482546.2498733573,
    199198.94911032374
   ]
  },
  "max_100m": {
   "gradient_pct": 18.68409079017266,
   "start_distance_m": 534.0,
   "end_distance_m": 634.0,
   "midpoint_distance_m": 584.0,
   "start_elevation_m": 169.28005088599335,
   "end_elevation_m": 187.964141676166,
   "start_xy": [
    482501.2444332525,
    199177.1688796403
   ],
   "end_xy": [
    482592.4207687604,
    199210.8313802155
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.923202784449245,
   "start_distance_m": 853.0,
   "end_distance_m": 858.0,
   "midpoint_distance_m": 855.5,
   "start_elevation_m": 200.67837808758324,
   "end_elevation_m": 200.33221794836078,
   "start_xy": [
    482801.5495321038,
    199236.06808710267
   ],
   "end_xy": [
    482806.0919111976,
    199238.1577740775
   ]
  },
  "min_10m": {
   "gradient_pct": -3.8094590533211203,
   "start_distance_m": 849.0,
   "end_distance_m": 859.0,
   "midpoint_distance_m": 854.0,
   "start_elevation_m": 200.74517403755277,
   "end_elevation_m": 200.36422813222066,
   "start_xy": [
    482797.91516605206,
    199234.39734373457
   ],
   "end_xy": [
    482807.00035587564,
    199238.57577918132
   ]
  },
  "min_20m": {
   "gradient_pct": -2.860798414929775,
   "start_distance_m": 870.0,
   "end_distance_m": 890.0,
   "midpoint_distance_m": 880.0,
   "start_elevation_m": 200.65312490641605,
   "end_elevation_m": 200.0809652234301,
   "start_xy": [
    482816.9932473348,
    199243.17383532343
   ],
   "end_xy": [
    482835.1255955921,
    199251.61207213652
   ]
  },
  "min_25m": {
   "gradient_pct": -2.706059446082236,
   "start_distance_m": 870.0,
   "end_distance_m": 895.0,
   "midpoint_distance_m": 882.5,
   "start_elevation_m": 200.65312490641605,
   "end_elevation_m": 199.9766100448955,
   "start_xy": [
    482816.9932473348,
    199243.17383532343
   ],
   "end_xy": [
    482839.64136166504,
    199253.75866403405
   ]
  },
  "min_50m": {
   "gradient_pct": -1.7443293612313369,
   "start_distance_m": 870.0,
   "end_distance_m": 920.0,
   "midpoint_distance_m": 895.0,
   "start_elevation_m": 200.65312490641605,
   "end_elevation_m": 199.78096022580038,
   "start_xy": [
    482816.9932473348,
    199243.17383532343
   ],
   "end_xy": [
    482862.2201920297,
    199264.49162352158
   ]
  },
  "min_100m": {
   "gradient_pct": -1.0623216979056451,
   "start_distance_m": 835.0,
   "end_distance_m": 935.0,
   "midpoint_distance_m": 885.0,
   "start_elevation_m": 200.6459963696928,
   "end_elevation_m": 199.58367467178715,
   "start_xy": [
    482784.98500869994,
    199229.11362827013
   ],
   "end_xy": [
    482876.2712000306,
    199269.72884075777
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.31825614071721,
   "start_distance_m": 514.0,
   "end_distance_m": 516.0,
   "midpoint_distance_m": 515.0,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.35888626839142,
   "start_xy": [
    482483.834754283,
    199167.41494554485
   ],
   "end_xy": [
    482485.4968949402,
    199168.52728022277
   ]
  },
  "max_3m": {
   "gradient_pct": 22.879735529834495,
   "start_distance_m": 514.0,
   "end_distance_m": 517.0,
   "midpoint_distance_m": 515.5,
   "start_elevation_m": 165.85252114557707,
   "end_elevation_m": 166.5389132114721,
   "start_xy": [
    482483.834754283,
    199167.41494554485
   ],
   "end_xy": [
    482486.3279652688,
    199169.08344756174
   ]
  }
 },
 "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": 0.091,
   "obstruction_max_height_m": 13.65,
   "flagged_windows_m": [
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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/SU8095.tif"
  ],
  "calculated_at": "2026-09-05T01:11:47+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "/mnt/HC_Volume_106792346/hunt-gb/regions/region-06.osm.pbf",
  "osm_snapshot": "",
  "run_id": "hunt-england-260905",
  "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": [
   "SU8095.tif"
  ],
  "climb_origin": "discovered",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Saunderton",
  "county": "Buckinghamshire"
 }
}