{
 "ocl_version": "0.1.0",
 "name": "Hemlock Brook Road",
 "slug": "hemlock-brook-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.824222460736678,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1002.0,
   "end_distance_m": 1004.0,
   "start_elevation_m": 357.70560718337714,
   "end_elevation_m": 358.2020916325919,
   "min_gradient_pct": -16.527084228113154
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.118923571419753,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1001.0,
   "end_distance_m": 1004.0,
   "start_elevation_m": 357.4785239254493,
   "end_elevation_m": 358.2020916325919,
   "min_gradient_pct": -14.432737713741517
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.187443820554563,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 999.0,
   "end_distance_m": 1004.0,
   "start_elevation_m": 357.04271944156415,
   "end_elevation_m": 358.2020916325919,
   "min_gradient_pct": -13.225033079675086
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.678074712062312,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 999.0,
   "end_distance_m": 1009.0,
   "start_elevation_m": 357.04271944156415,
   "end_elevation_m": 359.2105269127704,
   "min_gradient_pct": -12.598134443770164
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.341074937950566,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 958.0,
   "end_distance_m": 978.0,
   "start_elevation_m": 348.4987083055929,
   "end_elevation_m": 352.766923293183,
   "min_gradient_pct": -11.852063653339826
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.17461029426613,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 955.0,
   "end_distance_m": 980.0,
   "start_elevation_m": 347.9237131114112,
   "end_elevation_m": 353.2173656849777,
   "min_gradient_pct": -11.371211434526685
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.98350943472144,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 959.0,
   "end_distance_m": 1009.0,
   "start_elevation_m": 348.71877219540966,
   "end_elevation_m": 359.2105269127704,
   "min_gradient_pct": -9.645383438079875
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.26885350117152,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 929.0,
   "end_distance_m": 1029.0,
   "start_elevation_m": 342.8033334858484,
   "end_elevation_m": 363.0721869870199,
   "min_gradient_pct": -7.563171613652571
  }
 ],
 "shape": {
  "ascent_concentration": 0.427,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 433.0,
  "shape_class": "sustained"
 },
 "length_m": 1891.3559549527893,
 "start_elevation_m": 253.79966663745134,
 "end_elevation_m": 409.2123616276262,
 "endpoint_gain_m": 155.41269499017486,
 "overall_gradient_pct": 8.21699874014747,
 "accumulated_ascent_m": 169.10029901440103,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.187443820554563,
   "start_distance_m": 999.0,
   "end_distance_m": 1004.0,
   "midpoint_distance_m": 1001.5,
   "start_elevation_m": 357.04271944156415,
   "end_elevation_m": 358.2020916325919,
   "start_xy": [
    280677.38016982726,
    4835052.774378883
   ],
   "end_xy": [
    280679.55647926935,
    4835057.275898316
   ]
  },
  "max_10m": {
   "gradient_pct": 21.678074712062312,
   "start_distance_m": 999.0,
   "end_distance_m": 1009.0,
   "midpoint_distance_m": 1004.0,
   "start_elevation_m": 357.04271944156415,
   "end_elevation_m": 359.2105269127704,
   "start_xy": [
    280677.38016982726,
    4835052.774378883
   ],
   "end_xy": [
    280681.5485458614,
    4835061.859472235
   ]
  },
  "max_20m": {
   "gradient_pct": 21.341074937950566,
   "start_distance_m": 958.0,
   "end_distance_m": 978.0,
   "midpoint_distance_m": 968.0,
   "start_elevation_m": 348.4987083055929,
   "end_elevation_m": 352.766923293183,
   "start_xy": [
    280659.5344324022,
    4835015.861919526
   ],
   "end_xy": [
    280668.23967017053,
    4835033.867997261
   ]
  },
  "max_25m": {
   "gradient_pct": 21.17461029426613,
   "start_distance_m": 955.0,
   "end_distance_m": 980.0,
   "midpoint_distance_m": 967.5,
   "start_elevation_m": 347.9237131114112,
   "end_elevation_m": 353.2173656849777,
   "start_xy": [
    280658.22864673694,
    4835013.161007865
   ],
   "end_xy": [
    280669.11019394733,
    4835035.668605034
   ]
  },
  "max_50m": {
   "gradient_pct": 20.98350943472144,
   "start_distance_m": 959.0,
   "end_distance_m": 1009.0,
   "midpoint_distance_m": 984.0,
   "start_elevation_m": 348.71877219540966,
   "end_elevation_m": 359.2105269127704,
   "start_xy": [
    280659.9696942906,
    4835016.762223412
   ],
   "end_xy": [
    280681.5485458614,
    4835061.859472235
   ]
  },
  "max_100m": {
   "gradient_pct": 20.26885350117152,
   "start_distance_m": 929.0,
   "end_distance_m": 1029.0,
   "midpoint_distance_m": 979.0,
   "start_elevation_m": 342.8033334858484,
   "end_elevation_m": 363.0721869870199,
   "start_xy": [
    280646.9014536125,
    4834989.758261239
   ],
   "end_xy": [
    280689.1088016609,
    4835080.375479694
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.225033079675086,
   "start_distance_m": 1639.0,
   "end_distance_m": 1644.0,
   "midpoint_distance_m": 1641.5,
   "start_elevation_m": 410.2244392422259,
   "end_elevation_m": 409.56318758824216,
   "start_xy": [
    281094.8685575483,
    4835481.099658406
   ],
   "end_xy": [
    281099.86199529143,
    4835481.116289105
   ]
  },
  "min_10m": {
   "gradient_pct": -12.598134443770164,
   "start_distance_m": 1639.0,
   "end_distance_m": 1649.0,
   "midpoint_distance_m": 1644.0,
   "start_elevation_m": 410.2244392422259,
   "end_elevation_m": 408.9646257978489,
   "start_xy": [
    281094.8685575483,
    4835481.099658406
   ],
   "end_xy": [
    281104.85987847886,
    4835480.970811806
   ]
  },
  "min_20m": {
   "gradient_pct": -11.852063653339826,
   "start_distance_m": 1634.0,
   "end_distance_m": 1654.0,
   "midpoint_distance_m": 1644.0,
   "start_elevation_m": 410.7811327356825,
   "end_elevation_m": 408.4107200050145,
   "start_xy": [
    281089.88615836593,
    4835480.680494491
   ],
   "end_xy": [
    281109.8577616663,
    4835480.825334505
   ]
  },
  "min_25m": {
   "gradient_pct": -11.371211434526685,
   "start_distance_m": 1632.0,
   "end_distance_m": 1657.0,
   "midpoint_distance_m": 1644.5,
   "start_elevation_m": 410.9749243294588,
   "end_elevation_m": 408.13212147082714,
   "start_xy": [
    281087.893198693,
    4835480.512828926
   ],
   "end_xy": [
    281112.85649157874,
    4835480.738048125
   ]
  },
  "min_50m": {
   "gradient_pct": -9.645383438079875,
   "start_distance_m": 1606.0,
   "end_distance_m": 1656.0,
   "midpoint_distance_m": 1631.0,
   "start_elevation_m": 413.04529143352823,
   "end_elevation_m": 408.2225997144883,
   "start_xy": [
    281062.6192208951,
    4835475.4133016355
   ],
   "end_xy": [
    281111.8569149413,
    4835480.767143585
   ]
  },
  "min_100m": {
   "gradient_pct": -7.563171613652571,
   "start_distance_m": 1592.0,
   "end_distance_m": 1692.0,
   "midpoint_distance_m": 1642.0,
   "start_elevation_m": 413.98487697101325,
   "end_elevation_m": 406.4217053573607,
   "start_xy": [
    281049.5993763398,
    4835470.342079979
   ],
   "end_xy": [
    281147.8416738907,
    4835479.719707024
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.824222460736678,
   "start_distance_m": 1002.0,
   "end_distance_m": 1004.0,
   "midpoint_distance_m": 1003.0,
   "start_elevation_m": 357.70560718337714,
   "end_elevation_m": 358.2020916325919,
   "start_xy": [
    280678.6859554925,
    4835055.4752905425
   ],
   "end_xy": [
    280679.55647926935,
    4835057.275898316
   ]
  },
  "max_3m": {
   "gradient_pct": 24.118923571419753,
   "start_distance_m": 1001.0,
   "end_distance_m": 1004.0,
   "midpoint_distance_m": 1002.5,
   "start_elevation_m": 357.4785239254493,
   "end_elevation_m": 358.2020916325919,
   "start_xy": [
    280678.25069360406,
    4835054.574986656
   ],
   "end_xy": [
    280679.55647926935,
    4835057.275898316
   ]
  }
 },
 "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": {
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "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_one_meter_x27y484_NH_CT_RiverNorthL6_2015.tif",
   "data/cache/usa/nh/USGS_one_meter_x28y484_NH_CT_RiverNorthL6_2015.tif"
  ],
  "calculated_at": "2026-08-24T20:19:29+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-nh-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, NH_CT_RiverNorthL6_2015 (collected 2015)",
  "elevation_tile_ids": [
   "x27y484",
   "x28y484"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 18.9% over 200 m (Terrain 50), gain 155.3 m over 1891 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_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Bristol",
  "county": "New Hampshire"
 }
}