{
 "ocl_version": "0.1.0",
 "name": "North Hill Road",
 "slug": "north-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.456714675099875,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3729.0,
   "end_distance_m": 3731.0,
   "start_elevation_m": 406.7576363487225,
   "end_elevation_m": 407.4267706422245,
   "min_gradient_pct": -44.948881627448145
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 31.854318493501903,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3729.0,
   "end_distance_m": 3732.0,
   "start_elevation_m": 406.7576363487225,
   "end_elevation_m": 407.71326590352754,
   "min_gradient_pct": -41.24981329343503
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.11410709589495,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3727.0,
   "end_distance_m": 3732.0,
   "start_elevation_m": 406.3075605487328,
   "end_elevation_m": 407.71326590352754,
   "min_gradient_pct": -31.12507053600666
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.15799785454203,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3722.0,
   "end_distance_m": 3732.0,
   "start_elevation_m": 405.39746611807334,
   "end_elevation_m": 407.71326590352754,
   "min_gradient_pct": -20.623382958353318
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.862520013274093,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3712.0,
   "end_distance_m": 3732.0,
   "start_elevation_m": 403.5407619008727,
   "end_elevation_m": 407.71326590352754,
   "min_gradient_pct": -18.88641841827905
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.451537202301324,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3707.0,
   "end_distance_m": 3732.0,
   "start_elevation_m": 402.6003816029522,
   "end_elevation_m": 407.71326590352754,
   "min_gradient_pct": -17.358445356917173
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.461289107325115,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 188.0,
   "end_distance_m": 238.0,
   "start_elevation_m": 184.96490155803366,
   "end_elevation_m": 194.19554611169622,
   "min_gradient_pct": -11.151677596859372
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.998306536612517,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "start_elevation_m": 176.0248779683183,
   "end_elevation_m": 194.0231845049308,
   "min_gradient_pct": -7.607189247491249
  }
 ],
 "shape": {
  "ascent_concentration": 0.413,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 387.0,
  "shape_class": "sustained"
 },
 "length_m": 4726.365378521607,
 "start_elevation_m": 167.16362120451748,
 "end_elevation_m": 436.4145709572615,
 "endpoint_gain_m": 269.250949752744,
 "overall_gradient_pct": 5.6967866042757125,
 "accumulated_ascent_m": 297.26333161187836,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.11410709589495,
   "start_distance_m": 3727.0,
   "end_distance_m": 3732.0,
   "midpoint_distance_m": 3729.5,
   "start_elevation_m": 406.3075605487328,
   "end_elevation_m": 407.71326590352754,
   "start_xy": [
    690231.7450054254,
    4975513.974573161
   ],
   "end_xy": [
    690235.652827428,
    4975510.855450337
   ]
  },
  "max_10m": {
   "gradient_pct": 23.15799785454203,
   "start_distance_m": 3722.0,
   "end_distance_m": 3732.0,
   "midpoint_distance_m": 3727.0,
   "start_elevation_m": 405.39746611807334,
   "end_elevation_m": 407.71326590352754,
   "start_xy": [
    690227.8371834228,
    4975517.093695986
   ],
   "end_xy": [
    690235.652827428,
    4975510.855450337
   ]
  },
  "max_20m": {
   "gradient_pct": 20.862520013274093,
   "start_distance_m": 3712.0,
   "end_distance_m": 3732.0,
   "midpoint_distance_m": 3722.0,
   "start_elevation_m": 403.5407619008727,
   "end_elevation_m": 407.71326590352754,
   "start_xy": [
    690220.0215394177,
    4975523.331941635
   ],
   "end_xy": [
    690235.652827428,
    4975510.855450337
   ]
  },
  "max_25m": {
   "gradient_pct": 20.451537202301324,
   "start_distance_m": 3707.0,
   "end_distance_m": 3732.0,
   "midpoint_distance_m": 3719.5,
   "start_elevation_m": 402.6003816029522,
   "end_elevation_m": 407.71326590352754,
   "start_xy": [
    690216.113717415,
    4975526.45106446
   ],
   "end_xy": [
    690235.652827428,
    4975510.855450337
   ]
  },
  "max_50m": {
   "gradient_pct": 18.461289107325115,
   "start_distance_m": 188.0,
   "end_distance_m": 238.0,
   "midpoint_distance_m": 213.0,
   "start_elevation_m": 184.96490155803366,
   "end_elevation_m": 194.19554611169622,
   "start_xy": [
    686936.852607789,
    4975291.274889707
   ],
   "end_xy": [
    686985.8935427072,
    4975287.578458159
   ]
  },
  "max_100m": {
   "gradient_pct": 17.998306536612517,
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 187.0,
   "start_elevation_m": 176.0248779683183,
   "end_elevation_m": 194.0231845049308,
   "start_xy": [
    686893.8076456508,
    4975318.000572298
   ],
   "end_xy": [
    686984.9025669321,
    4975287.4444170715
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -31.12507053600666,
   "start_distance_m": 4346.0,
   "end_distance_m": 4351.0,
   "midpoint_distance_m": 4348.5,
   "start_elevation_m": 435.30374889743416,
   "end_elevation_m": 433.7474953706338,
   "start_xy": [
    690549.4926858842,
    4975105.211639923
   ],
   "end_xy": [
    690554.3041058448,
    4975103.851405398
   ]
  },
  "min_10m": {
   "gradient_pct": -20.623382958353318,
   "start_distance_m": 4346.0,
   "end_distance_m": 4356.0,
   "midpoint_distance_m": 4351.0,
   "start_elevation_m": 435.30374889743416,
   "end_elevation_m": 433.24141060159883,
   "start_xy": [
    690549.4926858842,
    4975105.211639923
   ],
   "end_xy": [
    690559.1155258054,
    4975102.491170873
   ]
  },
  "min_20m": {
   "gradient_pct": -18.88641841827905,
   "start_distance_m": 4346.0,
   "end_distance_m": 4366.0,
   "midpoint_distance_m": 4356.0,
   "start_elevation_m": 435.30374889743416,
   "end_elevation_m": 431.52646521377835,
   "start_xy": [
    690549.4926858842,
    4975105.211639923
   ],
   "end_xy": [
    690568.7383657265,
    4975099.770701823
   ]
  },
  "min_25m": {
   "gradient_pct": -17.358445356917173,
   "start_distance_m": 4346.0,
   "end_distance_m": 4371.0,
   "midpoint_distance_m": 4358.5,
   "start_elevation_m": 435.30374889743416,
   "end_elevation_m": 430.96413755820487,
   "start_xy": [
    690549.4926858842,
    4975105.211639923
   ],
   "end_xy": [
    690573.5497856871,
    4975098.410467299
   ]
  },
  "min_50m": {
   "gradient_pct": -11.151677596859372,
   "start_distance_m": 4336.0,
   "end_distance_m": 4386.0,
   "midpoint_distance_m": 4361.0,
   "start_elevation_m": 435.79740955584106,
   "end_elevation_m": 430.22157075741137,
   "start_xy": [
    690539.6222917996,
    4975106.489160895
   ],
   "end_xy": [
    690587.9840455689,
    4975094.329763724
   ]
  },
  "min_100m": {
   "gradient_pct": -7.607189247491249,
   "start_distance_m": 4336.0,
   "end_distance_m": 4436.0,
   "midpoint_distance_m": 4386.0,
   "start_elevation_m": 435.79740955584106,
   "end_elevation_m": 428.1902203083498,
   "start_xy": [
    690539.6222917996,
    4975106.489160895
   ],
   "end_xy": [
    690636.0982451747,
    4975080.727418474
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.456714675099875,
   "start_distance_m": 3729.0,
   "end_distance_m": 3731.0,
   "midpoint_distance_m": 3730.0,
   "start_elevation_m": 406.7576363487225,
   "end_elevation_m": 407.4267706422245,
   "start_xy": [
    690233.3081342264,
    4975512.726924031
   ],
   "end_xy": [
    690234.8712630274,
    4975511.479274902
   ]
  },
  "max_3m": {
   "gradient_pct": 31.854318493501903,
   "start_distance_m": 3729.0,
   "end_distance_m": 3732.0,
   "midpoint_distance_m": 3730.5,
   "start_elevation_m": 406.7576363487225,
   "end_elevation_m": 407.71326590352754,
   "start_xy": [
    690233.3081342264,
    4975512.726924031
   ],
   "end_xy": [
    690235.652827428,
    4975510.855450337
   ]
  }
 },
 "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": {
  "no_bench_suppression": {
   "masked_fraction": 0.045,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.521,
   "obstruction_max_height_m": 29.06,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25
   ]
  },
  "excluded_ranges_m": [
   [
    3850.0,
    3930.0
   ],
   [
    3980.0,
    4030.0
   ],
   [
    4150.0,
    4200.0
   ],
   [
    4460.0,
    4490.0
   ]
  ],
  "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x68y498_VT_Statewide_A23.tif",
   "data/cache/usa/vt/USGS_1M_18_x69y498_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-04T21:24:48+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": [
   "x68y498",
   "x69y498"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_1_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": "Montgomery",
  "county": "Vermont"
 }
}