{
 "ocl_version": "0.1.0",
 "name": "Hurricane Mountain Road (east side)",
 "slug": "hurricane-mountain-road-east-side",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 34.94846845843398,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure",
    "no_bench_excluded"
   ],
   "start_distance_m": 429.0,
   "end_distance_m": 431.0,
   "start_elevation_m": 196.19219806123888,
   "end_elevation_m": 196.89116743040756,
   "min_gradient_pct": -33.18910151609771,
   "suppressed_max_gradient_pct": 37.11499545085388,
   "suppressed_location_m": [
    684.0,
    686.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.03503344404146,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 428.0,
   "end_distance_m": 431.0,
   "start_elevation_m": 195.96011642708632,
   "end_elevation_m": 196.89116743040756,
   "min_gradient_pct": -26.58977276043591
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.57611999445089,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 426.0,
   "end_distance_m": 431.0,
   "start_elevation_m": 195.51236143068502,
   "end_elevation_m": 196.89116743040756,
   "min_gradient_pct": -20.25192952712814
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.838180049414973,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3021.0,
   "end_distance_m": 3031.0,
   "start_elevation_m": 459.55861776468475,
   "end_elevation_m": 462.04243576962625,
   "min_gradient_pct": -14.639434603693644
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.01558163757113,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 3015.0,
   "end_distance_m": 3035.0,
   "start_elevation_m": 458.4206583204624,
   "end_elevation_m": 462.8237746479766,
   "min_gradient_pct": -6.9829985837159825
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.05000549413353,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2105.0,
   "end_distance_m": 2130.0,
   "start_elevation_m": 362.690411571704,
   "end_elevation_m": 367.95291294523736,
   "min_gradient_pct": -5.986788807542098
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.74090541013743,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2099.0,
   "end_distance_m": 2149.0,
   "start_elevation_m": 361.47437828278134,
   "end_elevation_m": 371.34483098785006,
   "min_gradient_pct": -4.013012944219895
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.42761851230432,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2982.0,
   "end_distance_m": 3082.0,
   "start_elevation_m": 452.7198313553683,
   "end_elevation_m": 471.1474498676726,
   "min_gradient_pct": -0.591289225556352
  }
 ],
 "shape": {
  "ascent_concentration": 0.336,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 439.0,
  "shape_class": "sustained"
 },
 "length_m": 3730.9999999999704,
 "start_elevation_m": 158.5489346060268,
 "end_elevation_m": 529.0969357578219,
 "endpoint_gain_m": 370.5480011517951,
 "overall_gradient_pct": 9.93160013808089,
 "accumulated_ascent_m": 379.0130181526962,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.57611999445089,
   "start_distance_m": 426.0,
   "end_distance_m": 431.0,
   "midpoint_distance_m": 428.5,
   "start_elevation_m": 195.51236143068502,
   "end_elevation_m": 196.89116743040756,
   "start_xy": [
    336975.5763147013,
    4882446.983397403
   ],
   "end_xy": [
    336971.48327868344,
    4882444.111628583
   ]
  },
  "max_10m": {
   "gradient_pct": 24.838180049414973,
   "start_distance_m": 3021.0,
   "end_distance_m": 3031.0,
   "midpoint_distance_m": 3026.0,
   "start_elevation_m": 459.55861776468475,
   "end_elevation_m": 462.04243576962625,
   "start_xy": [
    334707.4005266144,
    4881702.491849643
   ],
   "end_xy": [
    334697.45150106144,
    4881701.483439733
   ]
  },
  "max_20m": {
   "gradient_pct": 22.01558163757113,
   "start_distance_m": 3015.0,
   "end_distance_m": 3035.0,
   "midpoint_distance_m": 3025.0,
   "start_elevation_m": 458.4206583204624,
   "end_elevation_m": 462.8237746479766,
   "start_xy": [
    334713.3699419462,
    4881703.0968955895
   ],
   "end_xy": [
    334693.4718908403,
    4881701.08007577
   ]
  },
  "max_25m": {
   "gradient_pct": 21.05000549413353,
   "start_distance_m": 2105.0,
   "end_distance_m": 2130.0,
   "midpoint_distance_m": 2117.5,
   "start_elevation_m": 362.690411571704,
   "end_elevation_m": 367.95291294523736,
   "start_xy": [
    335592.6340316887,
    4881706.715115234
   ],
   "end_xy": [
    335568.9494641128,
    4881714.71769349
   ]
  },
  "max_50m": {
   "gradient_pct": 19.74090541013743,
   "start_distance_m": 2099.0,
   "end_distance_m": 2149.0,
   "midpoint_distance_m": 2124.0,
   "start_elevation_m": 361.47437828278134,
   "end_elevation_m": 371.34483098785006,
   "start_xy": [
    335598.3183279069,
    4881704.794496452
   ],
   "end_xy": [
    335550.87601141364,
    4881720.575468765
   ]
  },
  "max_100m": {
   "gradient_pct": 18.42761851230432,
   "start_distance_m": 2982.0,
   "end_distance_m": 3082.0,
   "midpoint_distance_m": 3032.0,
   "start_elevation_m": 452.7198313553683,
   "end_elevation_m": 471.1474498676726,
   "start_xy": [
    334746.20172627096,
    4881706.424648292
   ],
   "end_xy": [
    334646.6109244916,
    4881697.471969614
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.25192952712814,
   "start_distance_m": 666.0,
   "end_distance_m": 671.0,
   "midpoint_distance_m": 668.5,
   "start_elevation_m": 230.22377820478948,
   "end_elevation_m": 229.21118172843308,
   "start_xy": [
    336810.06676558946,
    4882279.8741904255
   ],
   "end_xy": [
    336806.0133441514,
    4882276.9467726825
   ]
  },
  "min_10m": {
   "gradient_pct": -14.639434603693644,
   "start_distance_m": 662.0,
   "end_distance_m": 672.0,
   "midpoint_distance_m": 667.0,
   "start_elevation_m": 230.61333168003625,
   "end_elevation_m": 229.1493882196669,
   "start_xy": [
    336813.30950273987,
    4882282.216124621
   ],
   "end_xy": [
    336805.20265986375,
    4882276.361289133
   ]
  },
  "min_20m": {
   "gradient_pct": -6.9829985837159825,
   "start_distance_m": 659.0,
   "end_distance_m": 679.0,
   "midpoint_distance_m": 669.0,
   "start_elevation_m": 230.61997703174526,
   "end_elevation_m": 229.22337731500207,
   "start_xy": [
    336815.74155560276,
    4882283.972575267
   ],
   "end_xy": [
    336799.54957592534,
    4882272.236521403
   ]
  },
  "min_25m": {
   "gradient_pct": -5.986788807542098,
   "start_distance_m": 658.0,
   "end_distance_m": 683.0,
   "midpoint_distance_m": 670.5,
   "start_elevation_m": 230.641020255354,
   "end_elevation_m": 229.14432305346847,
   "start_xy": [
    336816.5522398903,
    4882284.558058816
   ],
   "end_xy": [
    336796.6267030948,
    4882269.505804571
   ]
  },
  "min_50m": {
   "gradient_pct": -4.013012944219895,
   "start_distance_m": 1584.0,
   "end_distance_m": 1634.0,
   "midpoint_distance_m": 1609.0,
   "start_elevation_m": 329.3992791274672,
   "end_elevation_m": 327.39277265535725,
   "start_xy": [
    336055.93735838396,
    4881882.659115557
   ],
   "end_xy": [
    336007.41626203974,
    4881894.274139363
   ]
  },
  "min_100m": {
   "gradient_pct": -0.591289225556352,
   "start_distance_m": 1580.0,
   "end_distance_m": 1680.0,
   "midpoint_distance_m": 1630.0,
   "start_elevation_m": 329.3980472127541,
   "end_elevation_m": 328.8067579871977,
   "start_xy": [
    336059.8849131425,
    4881882.0135062095
   ],
   "end_xy": [
    335962.0188750608,
    4881890.040752317
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 34.94846845843398,
   "start_distance_m": 429.0,
   "end_distance_m": 431.0,
   "midpoint_distance_m": 430.0,
   "start_elevation_m": 196.19219806123888,
   "end_elevation_m": 196.89116743040756,
   "start_xy": [
    336973.1204930906,
    4882445.26033611
   ],
   "end_xy": [
    336971.48327868344,
    4882444.111628583
   ]
  },
  "max_3m": {
   "gradient_pct": 31.03503344404146,
   "start_distance_m": 428.0,
   "end_distance_m": 431.0,
   "midpoint_distance_m": 429.5,
   "start_elevation_m": 195.96011642708632,
   "end_elevation_m": 196.89116743040756,
   "start_xy": [
    336973.93910029414,
    4882445.834689875
   ],
   "end_xy": [
    336971.48327868344,
    4882444.111628583
   ]
  }
 },
 "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": 0.358,
   "obstruction_max_height_m": 27.68,
   "flagged_windows_m": [
    2,
    3,
    5,
    25,
    50,
    100
   ]
  },
  "no_bench_suppression": {
   "masked_fraction": 0.027,
   "windows_resited": [
    2.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    310.0,
    350.0
   ],
   [
    660.0,
    720.0
   ]
  ],
  "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/nh/USGS_1M_19_x32y489_NH_Umbagog_LiDAR_2016_D16.tif",
   "data/cache/usa/nh/USGS_1M_19_x33y489_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-08-22T14:59:29+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
   18822718,
   1005686204
  ],
  "osm_versions": {
   "18822718": 20,
   "1005686204": 3
  },
  "osm_timestamps": {
   "18822718": "2026-06-19 22:30:51+00:00",
   "1005686204": "2025-08-08 14:47:45+00:00"
  },
  "osm_retrieved_at": "2026-08-22T14:59:28+00:00",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.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, NH_Umbagog_LiDAR_2016_D16 (collected 2016)",
  "elevation_tile_ids": [
   "x32y489",
   "x33y489"
  ],
  "route_summit_trim_m": 5885.4,
  "route_summit_trim_loss_m": 363.7,
  "climb_origin": "named",
  "notes": "Steepest-road-in-the-Northeast folklore. EAST side: profiled ascent starts near the Maine line (158.5 m) - side verified against GNIS Hurricane Mountain (Carroll) 2026-08-22; the seed way crosses the crest and the west descent is summit-trimmed.",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Umbagog_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.998,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "New Hampshire",
  "county": ""
 }
}