{
 "ocl_version": "0.1.0",
 "name": "Mount Equinox (Skyline Drive)",
 "slug": "mount-equinox-skyline-drive",
 "confidence": "A",
 "reported_claims": [
  {
   "source_name": "Mt. Equinox Uphill (race materials)",
   "value_pct": 12,
   "evidence_type": "event_description",
   "claimed_window_m": null,
   "description": "Skyline Drive billed as ~5.2 miles averaging ~12%",
   "retrieved_at": "2026-08-22",
   "credibility": "Race description; measured 8,465 m at 11.46% overall",
   "observed_via": "press_reports"
  }
 ],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.55892518614951,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 6420.0,
   "end_distance_m": 6422.0,
   "start_elevation_m": 927.9668245657369,
   "end_elevation_m": 928.5380030694599,
   "min_gradient_pct": -10.883972136491593
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.485614730605295,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 6420.0,
   "end_distance_m": 6423.0,
   "start_elevation_m": 927.9668245657369,
   "end_elevation_m": 928.7613930076551,
   "min_gradient_pct": -10.505837049371772
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.185289063390883,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5574.0,
   "end_distance_m": 5579.0,
   "start_elevation_m": 819.4169981708699,
   "end_elevation_m": 820.5262626240394,
   "min_gradient_pct": -10.265143668730161
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.9079640472944,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5570.0,
   "end_distance_m": 5580.0,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 820.7220352412213,
   "min_gradient_pct": -9.699090525302836
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.446594036904457,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5570.0,
   "end_distance_m": 5590.0,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 822.6205576438728,
   "min_gradient_pct": -9.2223426735859
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 19.959603687165327,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5570.0,
   "end_distance_m": 5595.0,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 823.5211397582832,
   "min_gradient_pct": -9.153437305909392
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.04634894861988,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5565.0,
   "end_distance_m": 5615.0,
   "start_elevation_m": 817.705051582392,
   "end_elevation_m": 826.7282260567019,
   "min_gradient_pct": -8.364600421933574
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.38113367188646,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 5047.0,
   "end_distance_m": 5147.0,
   "start_elevation_m": 743.1935424238327,
   "end_elevation_m": 759.5746760957192,
   "min_gradient_pct": -6.268480065032918
  }
 ],
 "shape": {
  "ascent_concentration": 0.286,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 979.0,
  "shape_class": "sustained"
 },
 "length_m": 8465.394323046703,
 "start_elevation_m": 198.4783359913416,
 "end_elevation_m": 1168.7904582927997,
 "endpoint_gain_m": 970.3121223014581,
 "overall_gradient_pct": 11.462101885317043,
 "accumulated_ascent_m": 980.9242687392518,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.185289063390883,
   "start_distance_m": 5574.0,
   "end_distance_m": 5579.0,
   "midpoint_distance_m": 5576.5,
   "start_elevation_m": 819.4169981708699,
   "end_elevation_m": 820.5262626240394,
   "start_xy": [
    651776.3460688174,
    4778632.608662943
   ],
   "end_xy": [
    651779.3314191548,
    4778636.619608388
   ]
  },
  "max_10m": {
   "gradient_pct": 21.9079640472944,
   "start_distance_m": 5570.0,
   "end_distance_m": 5580.0,
   "midpoint_distance_m": 5575.0,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 820.7220352412213,
   "start_xy": [
    651773.9577885476,
    4778629.399906587
   ],
   "end_xy": [
    651779.9284892223,
    4778637.421797477
   ]
  },
  "max_20m": {
   "gradient_pct": 20.446594036904457,
   "start_distance_m": 5570.0,
   "end_distance_m": 5590.0,
   "midpoint_distance_m": 5580.0,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 822.6205576438728,
   "start_xy": [
    651773.9577885476,
    4778629.399906587
   ],
   "end_xy": [
    651785.899189897,
    4778645.4436883675
   ]
  },
  "max_25m": {
   "gradient_pct": 19.959603687165327,
   "start_distance_m": 5570.0,
   "end_distance_m": 5595.0,
   "midpoint_distance_m": 5582.5,
   "start_elevation_m": 818.5312388364919,
   "end_elevation_m": 823.5211397582832,
   "start_xy": [
    651773.9577885476,
    4778629.399906587
   ],
   "end_xy": [
    651788.8845402343,
    4778649.454633812
   ]
  },
  "max_50m": {
   "gradient_pct": 18.04634894861988,
   "start_distance_m": 5565.0,
   "end_distance_m": 5615.0,
   "midpoint_distance_m": 5590.0,
   "start_elevation_m": 817.705051582392,
   "end_elevation_m": 826.7282260567019,
   "start_xy": [
    651770.9724382103,
    4778625.388961142
   ],
   "end_xy": [
    651800.3087553744,
    4778665.816707819
   ]
  },
  "max_100m": {
   "gradient_pct": 16.38113367188646,
   "start_distance_m": 5047.0,
   "end_distance_m": 5147.0,
   "midpoint_distance_m": 5097.0,
   "start_elevation_m": 743.1935424238327,
   "end_elevation_m": 759.5746760957192,
   "start_xy": [
    651584.4007677073,
    4778169.670068372
   ],
   "end_xy": [
    651588.2160679791,
    4778268.695501717
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -10.265143668730161,
   "start_distance_m": 3773.0,
   "end_distance_m": 3778.0,
   "midpoint_distance_m": 3775.5,
   "start_elevation_m": 622.0712521005203,
   "end_elevation_m": 621.5579949170838,
   "start_xy": [
    651447.8638855941,
    4777749.03184621
   ],
   "end_xy": [
    651444.4813971274,
    4777752.714069963
   ]
  },
  "min_10m": {
   "gradient_pct": -9.699090525302836,
   "start_distance_m": 3773.0,
   "end_distance_m": 3783.0,
   "midpoint_distance_m": 3778.0,
   "start_elevation_m": 622.0712521005203,
   "end_elevation_m": 621.10134304799,
   "start_xy": [
    651447.8638855941,
    4777749.03184621
   ],
   "end_xy": [
    651441.0989086607,
    4777756.396293717
   ]
  },
  "min_20m": {
   "gradient_pct": -9.2223426735859,
   "start_distance_m": 3773.0,
   "end_distance_m": 3793.0,
   "midpoint_distance_m": 3783.0,
   "start_elevation_m": 622.0712521005203,
   "end_elevation_m": 620.2267835658031,
   "start_xy": [
    651447.8638855941,
    4777749.03184621
   ],
   "end_xy": [
    651433.9650457939,
    4777763.395244902
   ]
  },
  "min_25m": {
   "gradient_pct": -9.153437305909392,
   "start_distance_m": 3772.0,
   "end_distance_m": 3797.0,
   "midpoint_distance_m": 3784.5,
   "start_elevation_m": 622.1604932140372,
   "end_elevation_m": 619.8721338875598,
   "start_xy": [
    651448.5403832874,
    4777748.29540146
   ],
   "end_xy": [
    651431.0443712804,
    4777766.128312847
   ]
  },
  "min_50m": {
   "gradient_pct": -8.364600421933574,
   "start_distance_m": 3764.0,
   "end_distance_m": 3814.0,
   "midpoint_distance_m": 3789.0,
   "start_elevation_m": 622.7815117846698,
   "end_elevation_m": 618.599211573703,
   "start_xy": [
    651453.952364834,
    4777742.403843453
   ],
   "end_xy": [
    651417.9958870305,
    4777776.986467546
   ]
  },
  "min_100m": {
   "gradient_pct": -6.268480065032918,
   "start_distance_m": 3757.0,
   "end_distance_m": 3857.0,
   "midpoint_distance_m": 3807.0,
   "start_elevation_m": 623.1496070368066,
   "end_elevation_m": 616.8811269717737,
   "start_xy": [
    651458.3917755603,
    4777736.994422677
   ],
   "end_xy": [
    651378.5083263982,
    4777791.631097236
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.55892518614951,
   "start_distance_m": 6420.0,
   "end_distance_m": 6422.0,
   "midpoint_distance_m": 6421.0,
   "start_elevation_m": 927.9668245657369,
   "end_elevation_m": 928.5380030694599,
   "start_xy": [
    652105.6768718208,
    4779403.910149494
   ],
   "end_xy": [
    652106.643638022,
    4779405.660967335
   ]
  },
  "max_3m": {
   "gradient_pct": 26.485614730605295,
   "start_distance_m": 6420.0,
   "end_distance_m": 6423.0,
   "midpoint_distance_m": 6421.5,
   "start_elevation_m": 927.9668245657369,
   "end_elevation_m": 928.7613930076551,
   "start_xy": [
    652105.6768718208,
    4779403.910149494
   ],
   "end_xy": [
    652107.1270211226,
    4779406.536376256
   ]
  }
 },
 "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": []
 },
 "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_x65y478_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x65y479_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-22T14:30:46+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
   90264416,
   19679347,
   19679346,
   19677836
  ],
  "osm_versions": {
   "90264416": 11,
   "19679347": 13,
   "19679346": 14,
   "19677836": 14
  },
  "osm_timestamps": {
   "90264416": "2024-10-15 21:56:06+00:00",
   "19679347": "2021-09-25 04:01:02+00:00",
   "19679346": "2024-04-26 23:28:09+00:00",
   "19677836": "2024-12-24 18:34:53+00:00"
  },
  "osm_retrieved_at": "2026-08-22T14:30:46+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": [
   "x65y478",
   "x65y479"
  ],
  "climb_origin": "named",
  "notes": "ANNEX - private toll road (Skyline Drive), BUMPS venue. Southern VT: no EPT cloud - canopy honestly unavailable; VCGI DSM spot-check available (evaluated 2026-08-22). Added 2026-08-22 with the NH/MA founding entries.",
  "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": "Vermont",
  "county": ""
 }
}