{
 "ocl_version": "0.1.0",
 "name": "Brandon Gap (west side)",
 "slug": "brandon-gap-west-side",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 13.950098325381077,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 7703.0,
   "end_distance_m": 7705.0,
   "start_elevation_m": 618.3263158839384,
   "end_elevation_m": 618.605317850446,
   "min_gradient_pct": -53.37731940585115,
   "suppressed_max_gradient_pct": 87.14282139083593,
   "suppressed_location_m": [
    2687.0,
    2689.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 13.632423851546113,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 7813.0,
   "end_distance_m": 7816.0,
   "start_elevation_m": 632.0911512818288,
   "end_elevation_m": 632.5001239973752,
   "min_gradient_pct": -52.607724404636734,
   "suppressed_max_gradient_pct": 84.49100810399841,
   "suppressed_location_m": [
    2686.0,
    2689.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 13.352975435741428,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 7812.0,
   "end_distance_m": 7817.0,
   "start_elevation_m": 631.9618283908527,
   "end_elevation_m": 632.6294771626398,
   "min_gradient_pct": -51.04326906810002,
   "suppressed_max_gradient_pct": 77.45603769127229,
   "suppressed_location_m": [
    2686.0,
    2691.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 13.101676511497544,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 7807.0,
   "end_distance_m": 7817.0,
   "start_elevation_m": 631.31930951149,
   "end_elevation_m": 632.6294771626398,
   "min_gradient_pct": -42.25651446849099,
   "suppressed_max_gradient_pct": 55.76508583922191,
   "suppressed_location_m": [
    2682.0,
    2692.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 12.9333493927993,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 7798.0,
   "end_distance_m": 7818.0,
   "start_elevation_m": 630.1551829227898,
   "end_elevation_m": 632.7418528013496,
   "min_gradient_pct": -18.714182459975746,
   "suppressed_max_gradient_pct": 30.72814097444109,
   "suppressed_location_m": [
    2682.0,
    2702.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 12.8915751763559,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 6549.0,
   "end_distance_m": 6574.0,
   "start_elevation_m": 495.4522828797025,
   "end_elevation_m": 498.6751766737915,
   "min_gradient_pct": -13.789730409699132,
   "suppressed_max_gradient_pct": 25.562173117813927,
   "suppressed_location_m": [
    2682.0,
    2707.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 12.766136807721978,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure",
    "structure_excluded"
   ],
   "start_distance_m": 6543.0,
   "end_distance_m": 6593.0,
   "start_elevation_m": 494.70189215747155,
   "end_elevation_m": 501.08496056133254,
   "min_gradient_pct": -8.723536287066281,
   "suppressed_max_gradient_pct": 15.28283883337474,
   "suppressed_location_m": [
    2682.0,
    2732.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.685082089955358,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 6543.0,
   "end_distance_m": 6643.0,
   "start_elevation_m": 494.70189215747155,
   "end_elevation_m": 507.3869742474269,
   "min_gradient_pct": -8.63944076608675
  }
 ],
 "shape": {
  "ascent_concentration": 0.408,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 403.0,
  "shape_class": "sustained"
 },
 "length_m": 8398.274947643982,
 "start_elevation_m": 179.6263562706945,
 "end_elevation_m": 641.9375826278972,
 "endpoint_gain_m": 462.3112263572027,
 "overall_gradient_pct": 5.5048355672958476,
 "accumulated_ascent_m": 488.20080174941705,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 13.352975435741428,
   "start_distance_m": 7812.0,
   "end_distance_m": 7817.0,
   "midpoint_distance_m": 7814.5,
   "start_elevation_m": 631.9618283908527,
   "end_elevation_m": 632.6294771626398,
   "start_xy": [
    663088.0087713562,
    4856139.014585148
   ],
   "end_xy": [
    663092.8328871373,
    4856137.70008641
   ]
  },
  "max_10m": {
   "gradient_pct": 13.101676511497544,
   "start_distance_m": 7807.0,
   "end_distance_m": 7817.0,
   "midpoint_distance_m": 7812.0,
   "start_elevation_m": 631.31930951149,
   "end_elevation_m": 632.6294771626398,
   "start_xy": [
    663083.1846555751,
    4856140.329083885
   ],
   "end_xy": [
    663092.8328871373,
    4856137.70008641
   ]
  },
  "max_20m": {
   "gradient_pct": 12.9333493927993,
   "start_distance_m": 7798.0,
   "end_distance_m": 7818.0,
   "midpoint_distance_m": 7808.0,
   "start_elevation_m": 630.1551829227898,
   "end_elevation_m": 632.7418528013496,
   "start_xy": [
    663074.5012471692,
    4856142.695181613
   ],
   "end_xy": [
    663093.7977102936,
    4856137.437186663
   ]
  },
  "max_25m": {
   "gradient_pct": 12.8915751763559,
   "start_distance_m": 6549.0,
   "end_distance_m": 6574.0,
   "midpoint_distance_m": 6561.5,
   "start_elevation_m": 495.4522828797025,
   "end_elevation_m": 498.6751766737915,
   "start_xy": [
    662010.5493228507,
    4856532.334304481
   ],
   "end_xy": [
    662032.5275247527,
    4856544.248944264
   ]
  },
  "max_50m": {
   "gradient_pct": 12.766136807721978,
   "start_distance_m": 6543.0,
   "end_distance_m": 6593.0,
   "midpoint_distance_m": 6568.0,
   "start_elevation_m": 494.70189215747155,
   "end_elevation_m": 501.08496056133254,
   "start_xy": [
    662005.2745543942,
    4856529.474790933
   ],
   "end_xy": [
    662049.2309581982,
    4856553.304070499
   ]
  },
  "max_100m": {
   "gradient_pct": 12.685082089955358,
   "start_distance_m": 6543.0,
   "end_distance_m": 6643.0,
   "midpoint_distance_m": 6593.0,
   "start_elevation_m": 494.70189215747155,
   "end_elevation_m": 507.3869742474269,
   "start_xy": [
    662005.2745543942,
    4856529.474790933
   ],
   "end_xy": [
    662096.030760422,
    4856570.258284692
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -51.04326906810002,
   "start_distance_m": 2671.0,
   "end_distance_m": 2676.0,
   "midpoint_distance_m": 2673.5,
   "start_elevation_m": 287.0878031002029,
   "end_elevation_m": 284.5356396467979,
   "start_xy": [
    658293.3630011992,
    4856134.622438416
   ],
   "end_xy": [
    658297.6375899751,
    4856137.216256163
   ]
  },
  "min_10m": {
   "gradient_pct": -42.25651446849099,
   "start_distance_m": 2667.0,
   "end_distance_m": 2677.0,
   "midpoint_distance_m": 2672.0,
   "start_elevation_m": 288.43642076983775,
   "end_elevation_m": 284.21076932298865,
   "start_xy": [
    658289.9436261888,
    4856132.54689643
   ],
   "end_xy": [
    658298.4925497914,
    4856137.734950402
   ]
  },
  "min_20m": {
   "gradient_pct": -18.714182459975746,
   "start_distance_m": 2662.0,
   "end_distance_m": 2682.0,
   "midpoint_distance_m": 2672.0,
   "start_elevation_m": 288.1188539819176,
   "end_elevation_m": 284.37601748992245,
   "start_xy": [
    658285.6694074257,
    4856129.952468946
   ],
   "end_xy": [
    658302.7686879069,
    4856140.3262118
   ]
  },
  "min_25m": {
   "gradient_pct": -13.789730409699132,
   "start_distance_m": 2657.0,
   "end_distance_m": 2682.0,
   "midpoint_distance_m": 2669.5,
   "start_elevation_m": 287.82345009234723,
   "end_elevation_m": 284.37601748992245,
   "start_xy": [
    658281.3951886626,
    4856127.3580414625
   ],
   "end_xy": [
    658302.7686879069,
    4856140.3262118
   ]
  },
  "min_50m": {
   "gradient_pct": -8.723536287066281,
   "start_distance_m": 8282.0,
   "end_distance_m": 8332.0,
   "midpoint_distance_m": 8307.0,
   "start_elevation_m": 651.9045556890064,
   "end_elevation_m": 647.5427875454733,
   "start_xy": [
    663554.1098684068,
    4856090.973155498
   ],
   "end_xy": [
    663604.041537679,
    4856089.254385546
   ]
  },
  "min_100m": {
   "gradient_pct": -8.63944076608675,
   "start_distance_m": 8233.0,
   "end_distance_m": 8333.0,
   "midpoint_distance_m": 8283.0,
   "start_elevation_m": 656.0970794648724,
   "end_elevation_m": 647.4576386987857,
   "start_xy": [
    663505.1967569414,
    4856093.889921989
   ],
   "end_xy": [
    663605.0411669983,
    4856089.281610976
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 13.950098325381077,
   "start_distance_m": 7703.0,
   "end_distance_m": 7705.0,
   "midpoint_distance_m": 7704.0,
   "start_elevation_m": 618.3263158839384,
   "end_elevation_m": 618.605317850446,
   "start_xy": [
    662993.2199381697,
    4856189.786027064
   ],
   "end_xy": [
    662994.5740742495,
    4856188.318854909
   ]
  },
  "max_3m": {
   "gradient_pct": 13.632423851546113,
   "start_distance_m": 7813.0,
   "end_distance_m": 7816.0,
   "midpoint_distance_m": 7814.5,
   "start_elevation_m": 632.0911512818288,
   "end_elevation_m": 632.5001239973752,
   "start_xy": [
    663088.9735945124,
    4856138.7516854005
   ],
   "end_xy": [
    663091.8680639811,
    4856137.962986158
   ]
  }
 },
 "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": 0.076,
   "obstruction_max_height_m": 28.23,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "structure_suppression": {
   "masked_fraction": 0.004,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    2663.0,
    2694.0
   ]
  ],
  "review": [],
  "extent": [
   "descends_at_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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x65y486_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x66y486_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-22T09:47:38+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
   19719409,
   1019186870,
   19677054,
   1314047809,
   1314047808
  ],
  "osm_versions": {
   "19719409": 7,
   "1019186870": 1,
   "19677054": 8,
   "1314047809": 1,
   "1314047808": 1
  },
  "osm_timestamps": {
   "19719409": "2022-01-07 18:00:58+00:00",
   "1019186870": "2022-01-07 18:00:58+00:00",
   "19677054": "2024-09-07 21:01:58+00:00",
   "1314047809": "2024-09-07 21:01:58+00:00",
   "1314047808": "2024-09-07 21:01:58+00:00"
  },
  "osm_retrieved_at": "2026-08-22T09:47:38+00:00",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "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": [
   "x65y486",
   "x66y486"
  ],
  "route_base_cut_m": 3506,
  "climb_origin": "named",
  "notes": "VT-73 from Forest Dale/Brandon. Extent completed 2026-08-22: absorbs the final crest ramp (ways 1314047808/09) that was previously mislabeled as the 'east side' entry; end 97 m from GNIS 'Brandon Gap' pre-trim (VTrans paved). base_cut_m 3506 applied 2026-08-22 (ranked entries start where the climbing starts; forward-500 m >= 3% probe).",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_2_A23",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Vermont",
  "county": ""
 }
}