{
 "ocl_version": "0.1.0",
 "name": "Upper Notch Road",
 "slug": "upper-notch-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 17.525280608757043,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 790.0,
   "end_distance_m": 792.0,
   "start_elevation_m": 181.54053033026668,
   "end_elevation_m": 181.89103594244182,
   "min_gradient_pct": -4.7809577482269106
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 17.27226942587663,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 782.0,
   "end_distance_m": 785.0,
   "start_elevation_m": 180.18862277022492,
   "end_elevation_m": 180.70679085300122,
   "min_gradient_pct": -4.650126426040894
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 17.10584178643785,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 781.0,
   "end_distance_m": 786.0,
   "start_elevation_m": 180.0197888598142,
   "end_elevation_m": 180.8750809491361,
   "min_gradient_pct": -4.59748386025808
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 17.02413172216893,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 782.0,
   "end_distance_m": 792.0,
   "start_elevation_m": 180.18862277022492,
   "end_elevation_m": 181.89103594244182,
   "min_gradient_pct": -4.4399225555264366
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.84568602815844,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 775.0,
   "end_distance_m": 795.0,
   "start_elevation_m": 179.0178012312352,
   "end_elevation_m": 182.3869384368669,
   "min_gradient_pct": -4.336585065893814
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.744259885444308,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 773.0,
   "end_distance_m": 798.0,
   "start_elevation_m": 178.6846334175372,
   "end_elevation_m": 182.8706983888983,
   "min_gradient_pct": -4.29850113613179
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.447086085134515,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 752.0,
   "end_distance_m": 802.0,
   "start_elevation_m": 175.28533656418153,
   "end_elevation_m": 183.5088796067488,
   "min_gradient_pct": -3.675741303735208
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.758871209030163,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "start_elevation_m": 168.96670475276815,
   "end_elevation_m": 184.7255759617983,
   "min_gradient_pct": -1.7499148662098492
  }
 ],
 "shape": {
  "ascent_concentration": 0.322,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 418.0,
  "shape_class": "sustained"
 },
 "length_m": 6293.985989434937,
 "start_elevation_m": 136.38409557766587,
 "end_elevation_m": 563.4559809505706,
 "endpoint_gain_m": 427.0718853729047,
 "overall_gradient_pct": 6.78539618756359,
 "accumulated_ascent_m": 431.19422563865544,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 17.10584178643785,
   "start_distance_m": 781.0,
   "end_distance_m": 786.0,
   "midpoint_distance_m": 783.5,
   "start_elevation_m": 180.0197888598142,
   "end_elevation_m": 180.8750809491361,
   "start_xy": [
    653895.6395365644,
    4882739.233162013
   ],
   "end_xy": [
    653900.5725607554,
    4882740.048804294
   ]
  },
  "max_10m": {
   "gradient_pct": 17.02413172216893,
   "start_distance_m": 782.0,
   "end_distance_m": 792.0,
   "midpoint_distance_m": 787.0,
   "start_elevation_m": 180.18862277022492,
   "end_elevation_m": 181.89103594244182,
   "start_xy": [
    653896.6261414026,
    4882739.396290469
   ],
   "end_xy": [
    653906.336668778,
    4882741.577679109
   ]
  },
  "max_20m": {
   "gradient_pct": 16.84568602815844,
   "start_distance_m": 775.0,
   "end_distance_m": 795.0,
   "midpoint_distance_m": 785.0,
   "start_elevation_m": 179.0178012312352,
   "end_elevation_m": 182.3869384368669,
   "start_xy": [
    653889.7199075352,
    4882738.254391275
   ],
   "end_xy": [
    653909.1145982414,
    4882742.710422635
   ]
  },
  "max_25m": {
   "gradient_pct": 16.744259885444308,
   "start_distance_m": 773.0,
   "end_distance_m": 798.0,
   "midpoint_distance_m": 785.5,
   "start_elevation_m": 178.6846334175372,
   "end_elevation_m": 182.8706983888983,
   "start_xy": [
    653887.7466978588,
    4882737.928134362
   ],
   "end_xy": [
    653911.8925277047,
    4882743.843166161
   ]
  },
  "max_50m": {
   "gradient_pct": 16.447086085134515,
   "start_distance_m": 752.0,
   "end_distance_m": 802.0,
   "midpoint_distance_m": 777.0,
   "start_elevation_m": 175.28533656418153,
   "end_elevation_m": 183.5088796067488,
   "start_xy": [
    653866.8635905898,
    4882736.145273257
   ],
   "end_xy": [
    653915.6712354384,
    4882745.140682802
   ]
  },
  "max_100m": {
   "gradient_pct": 15.758871209030163,
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 168.96670475276815,
   "end_elevation_m": 184.7255759617983,
   "start_xy": [
    653826.9555862568,
    4882724.383783719
   ],
   "end_xy": [
    653923.3398436244,
    4882747.419377273
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.59748386025808,
   "start_distance_m": 2016.0,
   "end_distance_m": 2021.0,
   "midpoint_distance_m": 2018.5,
   "start_elevation_m": 284.3009439359733,
   "end_elevation_m": 284.0710697429604,
   "start_xy": [
    654969.6861392738,
    4882370.645908039
   ],
   "end_xy": [
    654973.2563870384,
    4882367.145432228
   ]
  },
  "min_10m": {
   "gradient_pct": -4.4399225555264366,
   "start_distance_m": 2009.0,
   "end_distance_m": 2019.0,
   "midpoint_distance_m": 2014.0,
   "start_elevation_m": 284.6054323987447,
   "end_elevation_m": 284.16144014319207,
   "start_xy": [
    654964.6877924035,
    4882375.5465741735
   ],
   "end_xy": [
    654971.8282879326,
    4882368.545622553
   ]
  },
  "min_20m": {
   "gradient_pct": -4.336585065893814,
   "start_distance_m": 2002.0,
   "end_distance_m": 2022.0,
   "midpoint_distance_m": 2012.0,
   "start_elevation_m": 284.89905914685625,
   "end_elevation_m": 284.0317421336775,
   "start_xy": [
    654959.7553027964,
    4882380.511686469
   ],
   "end_xy": [
    654973.9704365912,
    4882366.445337066
   ]
  },
  "min_25m": {
   "gradient_pct": -4.29850113613179,
   "start_distance_m": 2000.0,
   "end_distance_m": 2025.0,
   "midpoint_distance_m": 2012.5,
   "start_elevation_m": 284.97409889713475,
   "end_elevation_m": 283.8994736131018,
   "start_xy": [
    654958.3863680045,
    4882381.969773414
   ],
   "end_xy": [
    654976.1125852499,
    4882364.34505158
   ]
  },
  "min_50m": {
   "gradient_pct": -3.675741303735208,
   "start_distance_m": 1987.0,
   "end_distance_m": 2037.0,
   "midpoint_distance_m": 2012.0,
   "start_elevation_m": 285.35919039494274,
   "end_elevation_m": 283.52131974307514,
   "start_xy": [
    654949.4882918572,
    4882391.447338548
   ],
   "end_xy": [
    654984.6811798847,
    4882355.943909635
   ]
  },
  "min_100m": {
   "gradient_pct": -1.7499148662098492,
   "start_distance_m": 1965.0,
   "end_distance_m": 2065.0,
   "midpoint_distance_m": 2015.0,
   "start_elevation_m": 285.2963092299787,
   "end_elevation_m": 283.54639436376885,
   "start_xy": [
    654934.4300091462,
    4882407.486294929
   ],
   "end_xy": [
    655005.6724759887,
    4882337.479344497
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 17.525280608757043,
   "start_distance_m": 790.0,
   "end_distance_m": 792.0,
   "midpoint_distance_m": 791.0,
   "start_elevation_m": 181.54053033026668,
   "end_elevation_m": 181.89103594244182,
   "start_xy": [
    653904.4847158025,
    4882740.822516758
   ],
   "end_xy": [
    653906.336668778,
    4882741.577679109
   ]
  },
  "max_3m": {
   "gradient_pct": 17.27226942587663,
   "start_distance_m": 782.0,
   "end_distance_m": 785.0,
   "midpoint_distance_m": 783.5,
   "start_elevation_m": 180.18862277022492,
   "end_elevation_m": 180.70679085300122,
   "start_xy": [
    653896.6261414026,
    4882739.396290469
   ],
   "end_xy": [
    653899.5859559171,
    4882739.885675838
   ]
  }
 },
 "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": 0.175,
   "obstruction_max_height_m": 30.13,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "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_x65y489_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-04T15:32:08+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": "us-hs-bench-260904",
  "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": [
   "x65y489"
  ],
  "climb_origin": "discovered",
  "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": "Bristol",
  "county": "Vermont"
 }
}