{
 "ocl_version": "0.1.0",
 "name": "Lane near Toadsmoor Valley",
 "slug": "discovered-lane-51-7307-2-1838",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.547870719852654,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 54.0,
   "end_distance_m": 56.0,
   "start_elevation_m": 177.4984269906876,
   "end_elevation_m": 178.08938440508464,
   "min_gradient_pct": -7.107505961489835
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.33297758991004,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 52.0,
   "end_distance_m": 55.0,
   "start_elevation_m": 176.94994320880758,
   "end_elevation_m": 177.79993253650488,
   "min_gradient_pct": -3.3051154174804274
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.025508369550494,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 51.0,
   "end_distance_m": 56.0,
   "start_elevation_m": 176.68810898660712,
   "end_elevation_m": 178.08938440508464,
   "min_gradient_pct": -1.2924821307143475
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.565319884137466,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 51.0,
   "end_distance_m": 61.0,
   "start_elevation_m": 176.68810898660712,
   "end_elevation_m": 179.34464097502087,
   "min_gradient_pct": -0.8144915135005704
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.246961457393326,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 40.0,
   "end_distance_m": 60.0,
   "start_elevation_m": 174.28392377893522,
   "end_elevation_m": 179.13331607041388,
   "min_gradient_pct": -0.09866672006211274
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.843988585271973,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 35.0,
   "end_distance_m": 60.0,
   "start_elevation_m": 173.1723189240959,
   "end_elevation_m": 179.13331607041388,
   "min_gradient_pct": -0.04498461782679897
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.435327456146524,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 31.0,
   "end_distance_m": 81.0,
   "start_elevation_m": 172.4770507795551,
   "end_elevation_m": 183.19471450762836,
   "min_gradient_pct": 0.3793108899803883
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.08278048320929,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 24.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 171.74595295298576,
   "end_elevation_m": 188.82873343619505,
   "min_gradient_pct": 1.580404050145205
  }
 ],
 "shape": {
  "ascent_concentration": 0.464,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 110.0,
  "shape_class": "stepped"
 },
 "length_m": 373.6335909873526,
 "start_elevation_m": 169.22182642577948,
 "end_elevation_m": 204.3533698903352,
 "endpoint_gain_m": 35.131543464555705,
 "overall_gradient_pct": 9.402672648280411,
 "accumulated_ascent_m": 35.58269250290775,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.025508369550494,
   "start_distance_m": 51.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 53.5,
   "start_elevation_m": 176.68810898660712,
   "end_elevation_m": 178.08938440508464,
   "start_xy": [
    387434.49416548066,
    203549.76232862446
   ],
   "end_xy": [
    387430.00036066887,
    203547.9712573438
   ]
  },
  "max_10m": {
   "gradient_pct": 26.565319884137466,
   "start_distance_m": 51.0,
   "end_distance_m": 61.0,
   "midpoint_distance_m": 56.0,
   "start_elevation_m": 176.68810898660712,
   "end_elevation_m": 179.34464097502087,
   "start_xy": [
    387434.49416548066,
    203549.76232862446
   ],
   "end_xy": [
    387425.68789056,
    203550.3690973443
   ]
  },
  "max_20m": {
   "gradient_pct": 24.246961457393326,
   "start_distance_m": 40.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 174.28392377893522,
   "end_elevation_m": 179.13331607041388,
   "start_xy": [
    387439.9657722196,
    203559.304944602
   ],
   "end_xy": [
    387426.4954331082,
    203549.7914240032
   ]
  },
  "max_25m": {
   "gradient_pct": 23.843988585271973,
   "start_distance_m": 35.0,
   "end_distance_m": 60.0,
   "midpoint_distance_m": 47.5,
   "start_elevation_m": 173.1723189240959,
   "end_elevation_m": 179.13331607041388,
   "start_xy": [
    387442.45286619186,
    203563.64249731903
   ],
   "end_xy": [
    387426.4954331082,
    203549.7914240032
   ]
  },
  "max_50m": {
   "gradient_pct": 21.435327456146524,
   "start_distance_m": 31.0,
   "end_distance_m": 81.0,
   "midpoint_distance_m": 56.0,
   "start_elevation_m": 172.4770507795551,
   "end_elevation_m": 183.19471450762836,
   "start_xy": [
    387444.44254136964,
    203567.11253949266
   ],
   "end_xy": [
    387411.05513902154,
    203564.00297362407
   ]
  },
  "max_100m": {
   "gradient_pct": 17.08278048320929,
   "start_distance_m": 24.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 74.0,
   "start_elevation_m": 171.74595295298576,
   "end_elevation_m": 188.82873343619505,
   "start_xy": [
    387448.1569878509,
    203573.04465604568
   ],
   "end_xy": [
    387374.44579070166,
    203585.51295052
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.2924821307143475,
   "start_distance_m": 352.0,
   "end_distance_m": 357.0,
   "midpoint_distance_m": 354.5,
   "start_elevation_m": 204.39196706634823,
   "end_elevation_m": 204.3273429598125,
   "start_xy": [
    387329.5408574011,
    203782.7803155006
   ],
   "end_xy": [
    387331.05289084086,
    203787.54621047186
   ]
  },
  "min_10m": {
   "gradient_pct": -0.8144915135005704,
   "start_distance_m": 352.0,
   "end_distance_m": 362.0,
   "midpoint_distance_m": 357.0,
   "start_elevation_m": 204.39196706634823,
   "end_elevation_m": 204.31051791499817,
   "start_xy": [
    387329.5408574011,
    203782.7803155006
   ],
   "end_xy": [
    387332.56492428057,
    203792.31210544312
   ]
  },
  "min_20m": {
   "gradient_pct": -0.09866672006211274,
   "start_distance_m": 346.0,
   "end_distance_m": 366.0,
   "midpoint_distance_m": 356.0,
   "start_elevation_m": 204.37167049981986,
   "end_elevation_m": 204.35193715580743,
   "start_xy": [
    387327.72641727346,
    203777.0612415351
   ],
   "end_xy": [
    387333.77455103234,
    203796.12482142015
   ]
  },
  "min_25m": {
   "gradient_pct": -0.04498461782679897,
   "start_distance_m": 334.0,
   "end_distance_m": 359.0,
   "midpoint_distance_m": 346.5,
   "start_elevation_m": 204.3325503505624,
   "end_elevation_m": 204.3213041961057,
   "start_xy": [
    387324.513236039,
    203765.50499720787
   ],
   "end_xy": [
    387331.6577042167,
    203789.45256846037
   ]
  },
  "min_50m": {
   "gradient_pct": 0.3793108899803883,
   "start_distance_m": 323.0,
   "end_distance_m": 373.0,
   "midpoint_distance_m": 348.0,
   "start_elevation_m": 204.1796122853661,
   "end_elevation_m": 204.36926773035628,
   "start_xy": [
    387321.90195049404,
    203754.823554958
   ],
   "end_xy": [
    387335.89139784797,
    203802.79707437992
   ]
  },
  "min_100m": {
   "gradient_pct": 1.580404050145205,
   "start_distance_m": 273.0,
   "end_distance_m": 373.0,
   "midpoint_distance_m": 323.0,
   "start_elevation_m": 202.78886368021108,
   "end_elevation_m": 204.36926773035628,
   "start_xy": [
    387315.6798471319,
    203705.21706407279
   ],
   "end_xy": [
    387335.89139784797,
    203802.79707437992
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.547870719852654,
   "start_distance_m": 54.0,
   "end_distance_m": 56.0,
   "midpoint_distance_m": 55.0,
   "start_elevation_m": 177.4984269906876,
   "end_elevation_m": 178.08938440508464,
   "start_xy": [
    387431.9198937171,
    203548.53285584523
   ],
   "end_xy": [
    387430.00036066887,
    203547.9712573438
   ]
  },
  "max_3m": {
   "gradient_pct": 28.33297758991004,
   "start_distance_m": 52.0,
   "end_distance_m": 55.0,
   "midpoint_distance_m": 53.5,
   "start_elevation_m": 176.94994320880758,
   "end_elevation_m": 177.79993253650488,
   "start_xy": [
    387433.8394267653,
    203549.09445434666
   ],
   "end_xy": [
    387430.96012719296,
    203548.25205659453
   ]
  }
 },
 "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": 0.048,
   "obstruction_max_height_m": 18.13,
   "flagged_windows_m": [
    50,
    100
   ]
  },
  "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/SO8500.tif"
  ],
  "calculated_at": "2026-08-15T10:39:32+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": [
   "SO8500.tif"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.3% over 200 m (Terrain 50), gain 27.3 m over 212 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
  "naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (51.7307, -2.1838)'"
 },
 "area": {
  "place": "Toadsmoor Valley",
  "county": "Gloucestershire"
 }
}