{
 "ocl_version": "0.1.0",
 "name": "Tower Hill Road",
 "slug": "tower-hill-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 19.11947397467486,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 747.0,
   "end_distance_m": 749.0,
   "start_elevation_m": 74.89541590017814,
   "end_elevation_m": 75.27780537967163,
   "min_gradient_pct": -14.491405291808235
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 18.845413973746854,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 746.0,
   "end_distance_m": 749.0,
   "start_elevation_m": 74.71244296045923,
   "end_elevation_m": 75.27780537967163,
   "min_gradient_pct": -14.35071896873031
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 18.670539487519875,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 744.0,
   "end_distance_m": 749.0,
   "start_elevation_m": 74.34427840529564,
   "end_elevation_m": 75.27780537967163,
   "min_gradient_pct": -14.127844240908303
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 18.32747324654818,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 741.0,
   "end_distance_m": 751.0,
   "start_elevation_m": 73.7882041272788,
   "end_elevation_m": 75.62095145193362,
   "min_gradient_pct": -14.002840388045001
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.816616625133776,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 735.0,
   "end_distance_m": 755.0,
   "start_elevation_m": 72.88856998805815,
   "end_elevation_m": 76.2518933130849,
   "min_gradient_pct": -13.602476215132242
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.040655828115234,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 732.0,
   "end_distance_m": 757.0,
   "start_elevation_m": 72.50952860227564,
   "end_elevation_m": 76.51969255930445,
   "min_gradient_pct": -13.358486480640408
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 13.749660234426782,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 719.0,
   "end_distance_m": 769.0,
   "start_elevation_m": 71.08415685226191,
   "end_elevation_m": 77.9589869694753,
   "min_gradient_pct": -11.253631118624272
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 11.470075813054379,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 687.0,
   "end_distance_m": 787.0,
   "start_elevation_m": 68.0528645820417,
   "end_elevation_m": 79.52294039509609,
   "min_gradient_pct": -7.506389153821417
  }
 ],
 "shape": {
  "ascent_concentration": 0.397,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 76.0,
  "shape_class": "sustained"
 },
 "length_m": 3732.9999999999673,
 "start_elevation_m": 63.930198707096736,
 "end_elevation_m": 151.1624209235978,
 "endpoint_gain_m": 87.23222221650107,
 "overall_gradient_pct": 2.3367860224082997,
 "accumulated_ascent_m": 123.88682505688769,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 18.670539487519875,
   "start_distance_m": 744.0,
   "end_distance_m": 749.0,
   "midpoint_distance_m": 746.5,
   "start_elevation_m": 74.34427840529564,
   "end_elevation_m": 75.27780537967163,
   "start_xy": [
    299208.47397311294,
    4651900.228216015
   ],
   "end_xy": [
    299203.9654474605,
    4651898.092056396
   ]
  },
  "max_10m": {
   "gradient_pct": 18.32747324654818,
   "start_distance_m": 741.0,
   "end_distance_m": 751.0,
   "midpoint_distance_m": 746.0,
   "start_elevation_m": 73.7882041272788,
   "end_elevation_m": 75.62095145193362,
   "start_xy": [
    299211.1530414302,
    4651901.578250441
   ],
   "end_xy": [
    299201.965909805,
    4651898.049066106
   ]
  },
  "max_20m": {
   "gradient_pct": 16.816616625133776,
   "start_distance_m": 735.0,
   "end_distance_m": 755.0,
   "midpoint_distance_m": 745.0,
   "start_elevation_m": 72.88856998805815,
   "end_elevation_m": 76.2518933130849,
   "start_xy": [
    299216.5101710105,
    4651904.280315739
   ],
   "end_xy": [
    299197.9668134447,
    4651897.964064082
   ]
  },
  "max_25m": {
   "gradient_pct": 16.040655828115234,
   "start_distance_m": 732.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 744.5,
   "start_elevation_m": 72.50952860227564,
   "end_elevation_m": 76.51969255930445,
   "start_xy": [
    299219.1892393278,
    4651905.630350165
   ],
   "end_xy": [
    299195.9698725236,
    4651897.945966215
   ]
  },
  "max_50m": {
   "gradient_pct": 13.749660234426782,
   "start_distance_m": 719.0,
   "end_distance_m": 769.0,
   "midpoint_distance_m": 744.0,
   "start_elevation_m": 71.08415685226191,
   "end_elevation_m": 77.9589869694753,
   "start_xy": [
    299230.9747638367,
    4651911.09658139
   ],
   "end_xy": [
    299184.90074534947,
    4651902.4335352
   ]
  },
  "max_100m": {
   "gradient_pct": 11.470075813054379,
   "start_distance_m": 687.0,
   "end_distance_m": 787.0,
   "midpoint_distance_m": 737.0,
   "start_elevation_m": 68.0528645820417,
   "end_elevation_m": 79.52294039509609,
   "start_xy": [
    299259.50937034993,
    4651925.2859437205
   ],
   "end_xy": [
    299169.7693250239,
    4651911.947632679
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -14.127844240908303,
   "start_distance_m": 2532.0,
   "end_distance_m": 2537.0,
   "midpoint_distance_m": 2534.5,
   "start_elevation_m": 125.71102221361912,
   "end_elevation_m": 125.0046300015737,
   "start_xy": [
    297730.38132869446,
    4651987.875056967
   ],
   "end_xy": [
    297725.7917427012,
    4651989.852247511
   ]
  },
  "min_10m": {
   "gradient_pct": -14.002840388045001,
   "start_distance_m": 2531.0,
   "end_distance_m": 2541.0,
   "midpoint_distance_m": 2536.0,
   "start_elevation_m": 125.8542191648406,
   "end_elevation_m": 124.4539351260361,
   "start_xy": [
    297731.33110599784,
    4651987.56213034
   ],
   "end_xy": [
    297722.1398029576,
    4651991.484220584
   ]
  },
  "min_20m": {
   "gradient_pct": -13.602476215132242,
   "start_distance_m": 2524.0,
   "end_distance_m": 2544.0,
   "midpoint_distance_m": 2534.0,
   "start_elevation_m": 126.77022260123209,
   "end_elevation_m": 124.04972735820564,
   "start_xy": [
    297737.9869260668,
    4651985.395664083
   ],
   "end_xy": [
    297719.40084815014,
    4651992.708200389
   ]
  },
  "min_25m": {
   "gradient_pct": -13.358486480640408,
   "start_distance_m": 2521.0,
   "end_distance_m": 2546.0,
   "midpoint_distance_m": 2533.5,
   "start_elevation_m": 127.14112669780081,
   "end_elevation_m": 123.80150507764071,
   "start_xy": [
    297740.8989381075,
    4651984.675588975
   ],
   "end_xy": [
    297717.57487827825,
    4651993.524186925
   ]
  },
  "min_50m": {
   "gradient_pct": -11.253631118624272,
   "start_distance_m": 2507.0,
   "end_distance_m": 2557.0,
   "midpoint_distance_m": 2532.0,
   "start_elevation_m": 128.39236512070585,
   "end_elevation_m": 122.76554956139371,
   "start_xy": [
    297754.6231636228,
    4651985.786397806
   ],
   "end_xy": [
    297707.38044574024,
    4651997.642026878
   ]
  },
  "min_100m": {
   "gradient_pct": -7.506389153821417,
   "start_distance_m": 2469.0,
   "end_distance_m": 2569.0,
   "midpoint_distance_m": 2519.0,
   "start_elevation_m": 129.8471571653374,
   "end_elevation_m": 122.34076801151598,
   "start_xy": [
    297791.2017264182,
    4651996.064968725
   ],
   "end_xy": [
    297695.5528916057,
    4651999.00892454
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 19.11947397467486,
   "start_distance_m": 747.0,
   "end_distance_m": 749.0,
   "midpoint_distance_m": 748.0,
   "start_elevation_m": 74.89541590017814,
   "end_elevation_m": 75.27780537967163,
   "start_xy": [
    299205.7953070225,
    4651898.877384277
   ],
   "end_xy": [
    299203.9654474605,
    4651898.092056396
   ]
  },
  "max_3m": {
   "gradient_pct": 18.845413973746854,
   "start_distance_m": 746.0,
   "end_distance_m": 749.0,
   "midpoint_distance_m": 747.5,
   "start_elevation_m": 74.71244296045923,
   "end_elevation_m": 75.27780537967163,
   "start_xy": [
    299206.68832979485,
    4651899.327395753
   ],
   "end_xy": [
    299203.9654474605,
    4651898.092056396
   ]
  }
 },
 "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": []
 },
 "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/ri/USGS_1M_19_x29y466_RI_Statewide_D22.tif"
  ],
  "calculated_at": "2026-09-03T22:52:06+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/rhode-island-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "extent-trim-v2-260903",
  "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, RI_Statewide_D22 (collected 2022)",
  "elevation_tile_ids": [
   "x29y466"
  ],
  "route_cut_m": 3733.0,
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: MA_NE_CMGP_Sandy_Z19_A1_2015: no corridor points fetched",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Cumberland",
  "county": "Rhode Island"
 }
}