{
 "ocl_version": "0.1.0",
 "name": "Summit Trail Road",
 "slug": "summit-trail-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 35.116236045308824,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 512.0,
   "end_distance_m": 514.0,
   "start_elevation_m": 481.921633710108,
   "end_elevation_m": 482.62395843101416,
   "min_gradient_pct": -12.310969649240633,
   "suppressed_max_gradient_pct": 61.95178811003359,
   "suppressed_location_m": [
    698.0,
    700.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 32.582667170163404,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 511.0,
   "end_distance_m": 514.0,
   "start_elevation_m": 481.64647841590926,
   "end_elevation_m": 482.62395843101416,
   "min_gradient_pct": -11.778664026815022,
   "suppressed_max_gradient_pct": 52.66075253495046,
   "suppressed_location_m": [
    697.0,
    700.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.06671710752107,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 510.0,
   "end_distance_m": 515.0,
   "start_elevation_m": 481.40562599616584,
   "end_elevation_m": 482.8589618515419,
   "min_gradient_pct": -10.730514927415697,
   "suppressed_max_gradient_pct": 37.67889034583959,
   "suppressed_location_m": [
    697.0,
    702.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.813596264493754,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 714.0,
   "end_distance_m": 724.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 513.5232179538924,
   "min_gradient_pct": -9.382925610365191
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.759111492536363,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 714.0,
   "end_distance_m": 734.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 515.3936806259503,
   "min_gradient_pct": -8.812180231590787
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.5465640050993,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 714.0,
   "end_distance_m": 739.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 516.4284993287179,
   "min_gradient_pct": -8.477208923265607
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 17.699897858129134,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 714.0,
   "end_distance_m": 764.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 519.8918072565076,
   "min_gradient_pct": -6.788593604612288,
   "suppressed_max_gradient_pct": 18.750093370094874,
   "suppressed_location_m": [
    697.0,
    747.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.374128824342165,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 509.0,
   "end_distance_m": 609.0,
   "start_elevation_m": 481.1724788522447,
   "end_elevation_m": 496.54660767658686,
   "min_gradient_pct": -5.305648548724662,
   "suppressed_max_gradient_pct": 15.893410611682953,
   "suppressed_location_m": [
    644.0,
    744.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.637,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 291.0,
  "shape_class": "stepped"
 },
 "length_m": 1288.064585371319,
 "start_elevation_m": 470.98572915674043,
 "end_elevation_m": 529.3245343115211,
 "endpoint_gain_m": 58.33880515478069,
 "overall_gradient_pct": 4.52918322709439,
 "accumulated_ascent_m": 76.34567706860184,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.06671710752107,
   "start_distance_m": 510.0,
   "end_distance_m": 515.0,
   "midpoint_distance_m": 512.5,
   "start_elevation_m": 481.40562599616584,
   "end_elevation_m": 482.8589618515419,
   "start_xy": [
    677795.9842864148,
    4792959.299010817
   ],
   "end_xy": [
    677791.8333152371,
    4792962.0863820305
   ]
  },
  "max_10m": {
   "gradient_pct": 24.813596264493754,
   "start_distance_m": 714.0,
   "end_distance_m": 724.0,
   "midpoint_distance_m": 719.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 513.5232179538924,
   "start_xy": [
    677613.3844764068,
    4793048.475686621
   ],
   "end_xy": [
    677604.7126227776,
    4793053.455541502
   ]
  },
  "max_20m": {
   "gradient_pct": 21.759111492536363,
   "start_distance_m": 714.0,
   "end_distance_m": 734.0,
   "midpoint_distance_m": 724.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 515.3936806259503,
   "start_xy": [
    677613.3844764068,
    4793048.475686621
   ],
   "end_xy": [
    677596.0407691483,
    4793058.435396383
   ]
  },
  "max_25m": {
   "gradient_pct": 21.5465640050993,
   "start_distance_m": 714.0,
   "end_distance_m": 739.0,
   "midpoint_distance_m": 726.5,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 516.4284993287179,
   "start_xy": [
    677613.3844764068,
    4793048.475686621
   ],
   "end_xy": [
    677591.7048423337,
    4793060.925323823
   ]
  },
  "max_50m": {
   "gradient_pct": 17.699897858129134,
   "start_distance_m": 714.0,
   "end_distance_m": 764.0,
   "midpoint_distance_m": 739.0,
   "start_elevation_m": 511.04185832744304,
   "end_elevation_m": 519.8918072565076,
   "start_xy": [
    677613.3844764068,
    4793048.475686621
   ],
   "end_xy": [
    677570.0252082605,
    4793073.374961024
   ]
  },
  "max_100m": {
   "gradient_pct": 15.374128824342165,
   "start_distance_m": 509.0,
   "end_distance_m": 609.0,
   "midpoint_distance_m": 559.0,
   "start_elevation_m": 481.1724788522447,
   "end_elevation_m": 496.54660767658686,
   "start_xy": [
    677796.7947674193,
    4792958.713671421
   ],
   "end_xy": [
    677709.2739545711,
    4793006.1815750385
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.730514927415697,
   "start_distance_m": 1027.0,
   "end_distance_m": 1032.0,
   "midpoint_distance_m": 1029.5,
   "start_elevation_m": 536.5382356817034,
   "end_elevation_m": 536.0017099353327,
   "start_xy": [
    677318.1408767555,
    4793140.975507018
   ],
   "end_xy": [
    677313.3367716881,
    4793142.338282555
   ]
  },
  "min_10m": {
   "gradient_pct": -9.382925610365191,
   "start_distance_m": 1028.0,
   "end_distance_m": 1038.0,
   "midpoint_distance_m": 1033.0,
   "start_elevation_m": 536.4458289728822,
   "end_elevation_m": 535.5075364118456,
   "start_xy": [
    677317.2072727074,
    4793141.333813425
   ],
   "end_xy": [
    677307.5206664492,
    4793143.81236527
   ]
  },
  "min_20m": {
   "gradient_pct": -8.812180231590787,
   "start_distance_m": 1016.0,
   "end_distance_m": 1036.0,
   "midpoint_distance_m": 1026.0,
   "start_elevation_m": 537.432569684085,
   "end_elevation_m": 535.6701336377669,
   "start_xy": [
    677328.4105212842,
    4793137.034136539
   ],
   "end_xy": [
    677309.4593681955,
    4793143.321004366
   ]
  },
  "min_25m": {
   "gradient_pct": -8.477208923265607,
   "start_distance_m": 1014.0,
   "end_distance_m": 1039.0,
   "midpoint_distance_m": 1026.5,
   "start_elevation_m": 537.5369385926929,
   "end_elevation_m": 535.4176363618765,
   "start_xy": [
    677330.2777293804,
    4793136.317523725
   ],
   "end_xy": [
    677306.5513155761,
    4793144.058045723
   ]
  },
  "min_50m": {
   "gradient_pct": -6.788593604612288,
   "start_distance_m": 1013.0,
   "end_distance_m": 1063.0,
   "midpoint_distance_m": 1038.0,
   "start_elevation_m": 537.5874129072645,
   "end_elevation_m": 534.1931161049583,
   "start_xy": [
    677331.2113334285,
    4793135.959217317
   ],
   "end_xy": [
    677282.9545197444,
    4793147.594175411
   ]
  },
  "min_100m": {
   "gradient_pct": -5.305648548724662,
   "start_distance_m": 1016.0,
   "end_distance_m": 1116.0,
   "midpoint_distance_m": 1066.0,
   "start_elevation_m": 537.432569684085,
   "end_elevation_m": 532.1269211353604,
   "start_xy": [
    677328.4105212842,
    4793137.034136539
   ],
   "end_xy": [
    677231.7901452034,
    4793134.407840941
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 35.116236045308824,
   "start_distance_m": 512.0,
   "end_distance_m": 514.0,
   "midpoint_distance_m": 513.0,
   "start_elevation_m": 481.921633710108,
   "end_elevation_m": 482.62395843101416,
   "start_xy": [
    677794.3238979437,
    4792960.413959303
   ],
   "end_xy": [
    677792.6635094726,
    4792961.528907788
   ]
  },
  "max_3m": {
   "gradient_pct": 32.582667170163404,
   "start_distance_m": 511.0,
   "end_distance_m": 514.0,
   "midpoint_distance_m": 512.5,
   "start_elevation_m": 481.64647841590926,
   "end_elevation_m": 482.62395843101416,
   "start_xy": [
    677795.1540921793,
    4792959.8564850595
   ],
   "end_xy": [
    677792.6635094726,
    4792961.528907788
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.005,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    696.0,
    701.0
   ]
  ],
  "review": [],
  "extent": [],
  "suggested_summit_cut_m": 1001.0,
  "trailing_descent_m": 8.5
 },
 "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_x67y480_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-24T23:11:07+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": "redo-vt-1-260824",
  "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": [
   "x67y480"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.1% over 200 m (Terrain 50), gain 58.1 m over 1288 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "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.html"
 },
 "area": {
  "place": "Weston",
  "county": "Vermont"
 }
}