{
 "ocl_version": "0.1.0",
 "name": "Lane Swamp Road",
 "slug": "lane-swamp-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.75921007752993,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 202.72382070423419,
   "end_elevation_m": 203.29900490578478,
   "min_gradient_pct": -6.738524052657624
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.270273465631135,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "start_elevation_m": 202.45089670181585,
   "end_elevation_m": 203.29900490578478,
   "min_gradient_pct": -5.765428187603068
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.600242752499753,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 68.0,
   "end_distance_m": 73.0,
   "start_elevation_m": 201.63324160585222,
   "end_elevation_m": 203.0132537434772,
   "min_gradient_pct": -4.7667995343795155
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.35816254445075,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "start_elevation_m": 201.38702224558267,
   "end_elevation_m": 204.02283850002775,
   "min_gradient_pct": -4.150580256386149
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.971007147340146,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 66.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 201.16723155209797,
   "end_elevation_m": 205.761432981566,
   "min_gradient_pct": -2.6745127672568003
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.208694176290237,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 63.0,
   "end_distance_m": 88.0,
   "start_elevation_m": 200.5854253258242,
   "end_elevation_m": 206.13759886989675,
   "min_gradient_pct": -2.415559679385069
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.96657633446239,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 58.0,
   "end_distance_m": 108.0,
   "start_elevation_m": 199.80087597848376,
   "end_elevation_m": 209.28416414571495,
   "min_gradient_pct": -1.6711051479703656
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.785339830627576,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 17.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 194.57298631830452,
   "end_elevation_m": 210.3583261489321,
   "min_gradient_pct": -0.5666974348247891
  }
 ],
 "shape": {
  "ascent_concentration": 0.434,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 100.0,
  "shape_class": "sustained"
 },
 "length_m": 776.7073029570785,
 "start_elevation_m": 193.49101205138027,
 "end_elevation_m": 249.95289678626347,
 "endpoint_gain_m": 56.4618847348832,
 "overall_gradient_pct": 7.269390222020783,
 "accumulated_ascent_m": 58.61332886658212,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.600242752499753,
   "start_distance_m": 68.0,
   "end_distance_m": 73.0,
   "midpoint_distance_m": 70.5,
   "start_elevation_m": 201.63324160585222,
   "end_elevation_m": 203.0132537434772,
   "start_xy": [
    704626.5489322186,
    4774268.797256022
   ],
   "end_xy": [
    704626.0027771279,
    4774273.767337974
   ]
  },
  "max_10m": {
   "gradient_pct": 26.35816254445075,
   "start_distance_m": 67.0,
   "end_distance_m": 77.0,
   "midpoint_distance_m": 72.0,
   "start_elevation_m": 201.38702224558267,
   "end_elevation_m": 204.02283850002775,
   "start_xy": [
    704626.6581632367,
    4774267.8032396315
   ],
   "end_xy": [
    704625.5658530553,
    4774277.743403537
   ]
  },
  "max_20m": {
   "gradient_pct": 22.971007147340146,
   "start_distance_m": 66.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 201.16723155209797,
   "end_elevation_m": 205.761432981566,
   "start_xy": [
    704626.7673942548,
    4774266.809223241
   ],
   "end_xy": [
    704624.5827738922,
    4774286.689551052
   ]
  },
  "max_25m": {
   "gradient_pct": 22.208694176290237,
   "start_distance_m": 63.0,
   "end_distance_m": 88.0,
   "midpoint_distance_m": 75.5,
   "start_elevation_m": 200.5854253258242,
   "end_elevation_m": 206.13759886989675,
   "start_xy": [
    704627.0950873093,
    4774263.827174069
   ],
   "end_xy": [
    704624.3643118559,
    4774288.677583833
   ]
  },
  "max_50m": {
   "gradient_pct": 18.96657633446239,
   "start_distance_m": 58.0,
   "end_distance_m": 108.0,
   "midpoint_distance_m": 83.0,
   "start_elevation_m": 199.80087597848376,
   "end_elevation_m": 209.28416414571495,
   "start_xy": [
    704627.6412423998,
    4774258.857092116
   ],
   "end_xy": [
    704625.9314736722,
    4774308.480279198
   ]
  },
  "max_100m": {
   "gradient_pct": 15.785339830627576,
   "start_distance_m": 17.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 67.0,
   "start_elevation_m": 194.57298631830452,
   "end_elevation_m": 210.3583261489321,
   "start_xy": [
    704640.4281388674,
    4774220.400556249
   ],
   "end_xy": [
    704627.2837829839,
    4774317.378102501
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.7667995343795155,
   "start_distance_m": 708.0,
   "end_distance_m": 713.0,
   "midpoint_distance_m": 710.5,
   "start_elevation_m": 250.26766080740737,
   "end_elevation_m": 250.0293208306884,
   "start_xy": [
    704537.6248514155,
    4774879.662286068
   ],
   "end_xy": [
    704537.201617555,
    4774884.644341176
   ]
  },
  "min_10m": {
   "gradient_pct": -4.150580256386149,
   "start_distance_m": 707.0,
   "end_distance_m": 717.0,
   "midpoint_distance_m": 712.0,
   "start_elevation_m": 250.2827868908523,
   "end_elevation_m": 249.86772886521368,
   "start_xy": [
    704537.7094981876,
    4774878.665875047
   ],
   "end_xy": [
    704536.8630304665,
    4774888.629985263
   ]
  },
  "min_20m": {
   "gradient_pct": -2.6745127672568003,
   "start_distance_m": 697.0,
   "end_distance_m": 717.0,
   "midpoint_distance_m": 707.0,
   "start_elevation_m": 250.40263141866504,
   "end_elevation_m": 249.86772886521368,
   "start_xy": [
    704538.5559659087,
    4774868.701764831
   ],
   "end_xy": [
    704536.8630304665,
    4774888.629985263
   ]
  },
  "min_25m": {
   "gradient_pct": -2.415559679385069,
   "start_distance_m": 699.0,
   "end_distance_m": 724.0,
   "midpoint_distance_m": 711.5,
   "start_elevation_m": 250.37430643562743,
   "end_elevation_m": 249.77041651578116,
   "start_xy": [
    704538.3866723644,
    4774870.694586874
   ],
   "end_xy": [
    704536.2705030618,
    4774895.604862414
   ]
  },
  "min_50m": {
   "gradient_pct": -1.6711051479703656,
   "start_distance_m": 674.0,
   "end_distance_m": 724.0,
   "midpoint_distance_m": 699.0,
   "start_elevation_m": 250.60596908976635,
   "end_elevation_m": 249.77041651578116,
   "start_xy": [
    704540.5028416672,
    4774845.784311334
   ],
   "end_xy": [
    704536.2705030618,
    4774895.604862414
   ]
  },
  "min_100m": {
   "gradient_pct": -0.5666974348247891,
   "start_distance_m": 676.0,
   "end_distance_m": 776.0,
   "midpoint_distance_m": 726.0,
   "start_elevation_m": 250.59790984137575,
   "end_elevation_m": 250.03121240655096,
   "start_xy": [
    704540.3335481229,
    4774847.777133377
   ],
   "end_xy": [
    704531.8688709122,
    4774947.418235538
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.75921007752993,
   "start_distance_m": 72.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 73.0,
   "start_elevation_m": 202.72382070423419,
   "end_elevation_m": 203.29900490578478,
   "start_xy": [
    704626.112008146,
    4774272.773321584
   ],
   "end_xy": [
    704625.8935461098,
    4774274.761354365
   ]
  },
  "max_3m": {
   "gradient_pct": 28.270273465631135,
   "start_distance_m": 71.0,
   "end_distance_m": 74.0,
   "midpoint_distance_m": 72.5,
   "start_elevation_m": 202.45089670181585,
   "end_elevation_m": 203.29900490578478,
   "start_xy": [
    704626.2212391641,
    4774271.779305194
   ],
   "end_xy": [
    704625.8935461098,
    4774274.761354365
   ]
  }
 },
 "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": {
  "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x70y478_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-04T23:55:34+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "hunt-wave2-260905",
  "elevation_provider": "USGS 3DEP (The National Map)",
  "elevation_licence": "Public domain \u2014 USGS 3DEP 1 m DEM, courtesy of the U.S. Geological Survey",
  "elevation_dataset": "USGS 3DEP 1 m DEM, VT_Statewide_A23 (collected 2023)",
  "elevation_tile_ids": [
   "x70y478"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: VT_Statewide_2_A23: no EPT nodes intersect the corridor; VT_Statewide_1_A23: no EPT nodes intersect the corridor",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Westminster",
  "county": "Vermont"
 }
}