{
 "ocl_version": "0.1.0",
 "name": "Barrow Road",
 "slug": "barrow-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 20.793663795262773,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 990.0,
   "end_distance_m": 992.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 453.44734466874365,
   "min_gradient_pct": -20.651618460567533
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 20.54332265200287,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 993.0,
   "end_distance_m": 996.0,
   "start_elevation_m": 453.6438378645866,
   "end_elevation_m": 454.2601375441467,
   "min_gradient_pct": -19.718702562488488
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 20.49756348180381,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 990.0,
   "end_distance_m": 995.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 454.0563495669286,
   "min_gradient_pct": -18.85226735782453
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.299335060830117,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 990.0,
   "end_distance_m": 1000.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 455.0614048989214,
   "min_gradient_pct": -17.948928137751636
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.15537956779525,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 990.0,
   "end_distance_m": 1010.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 457.06254730639745,
   "min_gradient_pct": -16.40243497615245
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.012028744157078,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 989.0,
   "end_distance_m": 1014.0,
   "start_elevation_m": 452.8315905983456,
   "end_elevation_m": 457.83459778438487,
   "min_gradient_pct": -15.41015624553711
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.183381999873063,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 981.0,
   "end_distance_m": 1031.0,
   "start_elevation_m": 451.39629973016486,
   "end_elevation_m": 460.9879907301014,
   "min_gradient_pct": -11.453588034413883
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.47634885802688,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 957.0,
   "end_distance_m": 1057.0,
   "start_elevation_m": 447.6242489350584,
   "end_elevation_m": 465.1005977930853,
   "min_gradient_pct": -7.115105841648642
  }
 ],
 "shape": {
  "ascent_concentration": 0.452,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 495.0,
  "shape_class": "stepped"
 },
 "length_m": 1746.017615000334,
 "start_elevation_m": 373.99031032640295,
 "end_elevation_m": 508.77424625366984,
 "endpoint_gain_m": 134.7839359272669,
 "overall_gradient_pct": 7.719506078822757,
 "accumulated_ascent_m": 143.2536577662333,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 20.49756348180381,
   "start_distance_m": 990.0,
   "end_distance_m": 995.0,
   "midpoint_distance_m": 992.5,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 454.0563495669286,
   "start_xy": [
    690077.1890892991,
    4888749.848360039
   ],
   "end_xy": [
    690081.2176258682,
    4888752.809929405
   ]
  },
  "max_10m": {
   "gradient_pct": 20.299335060830117,
   "start_distance_m": 990.0,
   "end_distance_m": 1000.0,
   "midpoint_distance_m": 995.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 455.0614048989214,
   "start_xy": [
    690077.1890892991,
    4888749.848360039
   ],
   "end_xy": [
    690085.1079994699,
    4888755.944489707
   ]
  },
  "max_20m": {
   "gradient_pct": 20.15537956779525,
   "start_distance_m": 990.0,
   "end_distance_m": 1010.0,
   "midpoint_distance_m": 1000.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 457.06254730639745,
   "start_xy": [
    690077.1890892991,
    4888749.848360039
   ],
   "end_xy": [
    690092.6659210147,
    4888762.492605614
   ]
  },
  "max_25m": {
   "gradient_pct": 20.012028744157078,
   "start_distance_m": 989.0,
   "end_distance_m": 1014.0,
   "midpoint_distance_m": 1001.5,
   "start_elevation_m": 452.8315905983456,
   "end_elevation_m": 457.83459778438487,
   "start_xy": [
    690076.3833819852,
    4888749.256046166
   ],
   "end_xy": [
    690095.6890896327,
    4888765.111851975
   ]
  },
  "max_50m": {
   "gradient_pct": 19.183381999873063,
   "start_distance_m": 981.0,
   "end_distance_m": 1031.0,
   "midpoint_distance_m": 1006.0,
   "start_elevation_m": 451.39629973016486,
   "end_elevation_m": 460.9879907301014,
   "start_xy": [
    690069.9377234746,
    4888744.51753518
   ],
   "end_xy": [
    690109.17747199,
    4888775.447859245
   ]
  },
  "max_100m": {
   "gradient_pct": 17.47634885802688,
   "start_distance_m": 957.0,
   "end_distance_m": 1057.0,
   "midpoint_distance_m": 1007.0,
   "start_elevation_m": 447.6242489350584,
   "end_elevation_m": 465.1005977930853,
   "start_xy": [
    690050.0755923691,
    4888731.068176582
   ],
   "end_xy": [
    690131.8020564481,
    4888788.0183958635
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.85226735782453,
   "start_distance_m": 1701.0,
   "end_distance_m": 1706.0,
   "midpoint_distance_m": 1703.5,
   "start_elevation_m": 513.5084716861173,
   "end_elevation_m": 512.5658583182261,
   "start_xy": [
    690735.0695650283,
    4888963.768741406
   ],
   "end_xy": [
    690740.0395930051,
    4888963.22209535
   ]
  },
  "min_10m": {
   "gradient_pct": -17.948928137751636,
   "start_distance_m": 1697.0,
   "end_distance_m": 1707.0,
   "midpoint_distance_m": 1702.0,
   "start_elevation_m": 514.2029256380918,
   "end_elevation_m": 512.4080328243166,
   "start_xy": [
    690731.0935426468,
    4888964.20605825
   ],
   "end_xy": [
    690741.0335986004,
    4888963.112766138
   ]
  },
  "min_20m": {
   "gradient_pct": -16.40243497615245,
   "start_distance_m": 1696.0,
   "end_distance_m": 1716.0,
   "midpoint_distance_m": 1706.0,
   "start_elevation_m": 514.3503994147771,
   "end_elevation_m": 511.06991241954665,
   "start_xy": [
    690730.0995370515,
    4888964.31538746
   ],
   "end_xy": [
    690749.9838144578,
    4888962.174033257
   ]
  },
  "min_25m": {
   "gradient_pct": -15.41015624553711,
   "start_distance_m": 1694.0,
   "end_distance_m": 1719.0,
   "midpoint_distance_m": 1706.5,
   "start_elevation_m": 514.5680432700422,
   "end_elevation_m": 510.7155042086579,
   "start_xy": [
    690728.1115258607,
    4888964.5340458825
   ],
   "end_xy": [
    690752.9755763491,
    4888961.951860384
   ]
  },
  "min_50m": {
   "gradient_pct": -11.453588034413883,
   "start_distance_m": 1688.0,
   "end_distance_m": 1738.0,
   "midpoint_distance_m": 1713.0,
   "start_elevation_m": 515.0177811077854,
   "end_elevation_m": 509.2909870905784,
   "start_xy": [
    690722.1474922886,
    4888965.190021149
   ],
   "end_xy": [
    690771.9234016609,
    4888960.544765521
   ]
  },
  "min_100m": {
   "gradient_pct": -7.115105841648642,
   "start_distance_m": 1646.0,
   "end_distance_m": 1746.0,
   "midpoint_distance_m": 1696.0,
   "start_elevation_m": 515.8906161468402,
   "end_elevation_m": 508.7755103051916,
   "start_xy": [
    690680.3493145328,
    4888969.134193038
   ],
   "end_xy": [
    690779.9014333711,
    4888959.952304525
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 20.793663795262773,
   "start_distance_m": 990.0,
   "end_distance_m": 992.0,
   "midpoint_distance_m": 991.0,
   "start_elevation_m": 453.0314713928384,
   "end_elevation_m": 453.44734466874365,
   "start_xy": [
    690077.1890892991,
    4888749.848360039
   ],
   "end_xy": [
    690078.8005039267,
    4888751.0329877855
   ]
  },
  "max_3m": {
   "gradient_pct": 20.54332265200287,
   "start_distance_m": 993.0,
   "end_distance_m": 996.0,
   "midpoint_distance_m": 994.5,
   "start_elevation_m": 453.6438378645866,
   "end_elevation_m": 454.2601375441467,
   "start_xy": [
    690079.6062112405,
    4888751.625301659
   ],
   "end_xy": [
    690082.023333182,
    4888753.402243279
   ]
  }
 },
 "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": 0.067,
   "obstruction_max_height_m": 24.07,
   "flagged_windows_m": [
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "descends_at_end"
  ],
  "suggested_summit_cut_m": 1637.0,
  "trailing_descent_m": 7.3
 },
 "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_x68y489_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x69y489_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-24T23:09:16+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": [
   "x68y489",
   "x69y489"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 15.1% over 200 m (Terrain 50), gain 135.0 m over 1746 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_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": "Northfield",
  "county": "Vermont"
 }
}