{
 "ocl_version": "0.1.0",
 "name": "Lower Barnett Hill Road",
 "slug": "lower-barnett-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.224370823545826,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 725.0,
   "end_distance_m": 727.0,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 251.63652483372059,
   "min_gradient_pct": -3.0715304756824935
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.176205509117647,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 725.0,
   "end_distance_m": 728.0,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 251.8673235825232,
   "min_gradient_pct": -2.698006227598171
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.093466955809845,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 725.0,
   "end_distance_m": 730.0,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 252.32671076504016,
   "min_gradient_pct": -1.1841680007557898
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.533812713529358,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 721.0,
   "end_distance_m": 731.0,
   "start_elevation_m": 250.29715548851652,
   "end_elevation_m": 252.55053675986946,
   "min_gradient_pct": 2.362075039615661
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.718864423009023,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 714.0,
   "end_distance_m": 734.0,
   "start_elevation_m": 248.85338918429673,
   "end_elevation_m": 253.19716206889854,
   "min_gradient_pct": 4.83835299142612
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.23433260706861,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 709.0,
   "end_distance_m": 734.0,
   "start_elevation_m": 247.88857891713138,
   "end_elevation_m": 253.19716206889854,
   "min_gradient_pct": 5.674583411371259
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.461083028694986,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 685.0,
   "end_distance_m": 735.0,
   "start_elevation_m": 243.65454060892392,
   "end_elevation_m": 253.38508212327142,
   "min_gradient_pct": 7.198470011088716
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.587233838339642,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "start_elevation_m": 248.07688216120894,
   "end_elevation_m": 265.6641159995486,
   "min_gradient_pct": 8.71441765410512
  }
 ],
 "shape": {
  "ascent_concentration": 0.312,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 520.0,
  "shape_class": "sustained"
 },
 "length_m": 886.5206047191954,
 "start_elevation_m": 158.88085613190862,
 "end_elevation_m": 274.12029068910766,
 "endpoint_gain_m": 115.23943455719905,
 "overall_gradient_pct": 12.999070066025261,
 "accumulated_ascent_m": 115.3344482943308,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.093466955809845,
   "start_distance_m": 725.0,
   "end_distance_m": 730.0,
   "midpoint_distance_m": 727.5,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 252.32671076504016,
   "start_xy": [
    688547.0383460564,
    4905725.150583952
   ],
   "end_xy": [
    688547.111474531,
    4905730.150049146
   ]
  },
  "max_10m": {
   "gradient_pct": 22.533812713529358,
   "start_distance_m": 721.0,
   "end_distance_m": 731.0,
   "midpoint_distance_m": 726.0,
   "start_elevation_m": 250.29715548851652,
   "end_elevation_m": 252.55053675986946,
   "start_xy": [
    688546.9798432767,
    4905721.151011797
   ],
   "end_xy": [
    688547.126100226,
    4905731.149942185
   ]
  },
  "max_20m": {
   "gradient_pct": 21.718864423009023,
   "start_distance_m": 714.0,
   "end_distance_m": 734.0,
   "midpoint_distance_m": 724.0,
   "start_elevation_m": 248.85338918429673,
   "end_elevation_m": 253.19716206889854,
   "start_xy": [
    688546.8774634122,
    4905714.151760525
   ],
   "end_xy": [
    688547.1699773107,
    4905734.149621301
   ]
  },
  "max_25m": {
   "gradient_pct": 21.23433260706861,
   "start_distance_m": 709.0,
   "end_distance_m": 734.0,
   "midpoint_distance_m": 721.5,
   "start_elevation_m": 247.88857891713138,
   "end_elevation_m": 253.19716206889854,
   "start_xy": [
    688546.8043349376,
    4905709.1522953315
   ],
   "end_xy": [
    688547.1699773107,
    4905734.149621301
   ]
  },
  "max_50m": {
   "gradient_pct": 19.461083028694986,
   "start_distance_m": 685.0,
   "end_distance_m": 735.0,
   "midpoint_distance_m": 710.0,
   "start_elevation_m": 243.65454060892392,
   "end_elevation_m": 253.38508212327142,
   "start_xy": [
    688546.4533182594,
    4905685.1548624
   ],
   "end_xy": [
    688547.0037587038,
    4905735.1268609585
   ]
  },
  "max_100m": {
   "gradient_pct": 17.587233838339642,
   "start_distance_m": 710.0,
   "end_distance_m": 810.0,
   "midpoint_distance_m": 760.0,
   "start_elevation_m": 248.07688216120894,
   "end_elevation_m": 265.6641159995486,
   "start_xy": [
    688546.8189606325,
    4905710.15218837
   ],
   "end_xy": [
    688515.8175755973,
    4905803.181522183
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.1841680007557898,
   "start_distance_m": 881.0,
   "end_distance_m": 886.0,
   "midpoint_distance_m": 883.5,
   "start_elevation_m": 274.15738853647986,
   "end_elevation_m": 274.09818013644207,
   "start_xy": [
    688485.2263206933,
    4905867.224378888
   ],
   "end_xy": [
    688482.7734003784,
    4905871.581348239
   ]
  },
  "min_10m": {
   "gradient_pct": 2.362075039615661,
   "start_distance_m": 876.0,
   "end_distance_m": 886.0,
   "midpoint_distance_m": 881.0,
   "start_elevation_m": 273.8619726324805,
   "end_elevation_m": 274.09818013644207,
   "start_xy": [
    688487.6792410081,
    4905862.867409537
   ],
   "end_xy": [
    688482.7734003784,
    4905871.581348239
   ]
  },
  "min_20m": {
   "gradient_pct": 4.83835299142612,
   "start_distance_m": 866.0,
   "end_distance_m": 886.0,
   "midpoint_distance_m": 876.0,
   "start_elevation_m": 273.13050953815684,
   "end_elevation_m": 274.09818013644207,
   "start_xy": [
    688492.2324357936,
    4905853.972674763
   ],
   "end_xy": [
    688482.7734003784,
    4905871.581348239
   ]
  },
  "min_25m": {
   "gradient_pct": 5.674583411371259,
   "start_distance_m": 861.0,
   "end_distance_m": 886.0,
   "midpoint_distance_m": 873.5,
   "start_elevation_m": 272.67953428359925,
   "end_elevation_m": 274.09818013644207,
   "start_xy": [
    688494.3382518475,
    4905849.437750426
   ],
   "end_xy": [
    688482.7734003784,
    4905871.581348239
   ]
  },
  "min_50m": {
   "gradient_pct": 7.198470011088716,
   "start_distance_m": 173.0,
   "end_distance_m": 223.0,
   "midpoint_distance_m": 198.0,
   "start_elevation_m": 179.18318355373054,
   "end_elevation_m": 182.7824185592749,
   "start_xy": [
    688462.5480890753,
    4905206.786615416
   ],
   "end_xy": [
    688497.2860799502,
    4905242.630214214
   ]
  },
  "min_100m": {
   "gradient_pct": 8.71441765410512,
   "start_distance_m": 152.0,
   "end_distance_m": 252.0,
   "midpoint_distance_m": 202.0,
   "start_elevation_m": 177.07225618234074,
   "end_elevation_m": 185.78667383644586,
   "start_xy": [
    688448.0618075214,
    4905191.627492746
   ],
   "end_xy": [
    688514.8498239549,
    4905265.704338325
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.224370823545826,
   "start_distance_m": 725.0,
   "end_distance_m": 727.0,
   "midpoint_distance_m": 726.0,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 251.63652483372059,
   "start_xy": [
    688547.0383460564,
    4905725.150583952
   ],
   "end_xy": [
    688547.0675974463,
    4905727.15037003
   ]
  },
  "max_3m": {
   "gradient_pct": 23.176205509117647,
   "start_distance_m": 725.0,
   "end_distance_m": 728.0,
   "midpoint_distance_m": 726.5,
   "start_elevation_m": 251.17203741724967,
   "end_elevation_m": 251.8673235825232,
   "start_xy": [
    688547.0383460564,
    4905725.150583952
   ],
   "end_xy": [
    688547.0822231412,
    4905728.150263068
   ]
  }
 },
 "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": 0.52,
   "obstruction_max_height_m": 29.03,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "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_x68y491_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-04T21:29:04+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-wave1-260905",
  "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": [
   "x68y491"
  ],
  "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"
 },
 "area": {
  "place": "Middlesex",
  "county": "Vermont"
 }
}