{
 "ocl_version": "0.1.0",
 "name": "North Hollow Road",
 "slug": "north-hollow-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 8.508125611835737,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1412.0,
   "end_distance_m": 1414.0,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.28218108971168,
   "min_gradient_pct": -2.0018200132042807,
   "suppressed_max_gradient_pct": 173.0868386127085,
   "suppressed_location_m": [
    0.0,
    2.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 8.326093068883248,
   "diagnostic": true,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1412.0,
   "end_distance_m": 1415.0,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.36180136954147,
   "min_gradient_pct": -1.8936529272176965,
   "suppressed_max_gradient_pct": 128.16984929083426,
   "suppressed_location_m": [
    0.0,
    3.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 7.926169647704455,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2915.0,
   "end_distance_m": 2920.0,
   "start_elevation_m": 325.8002030528472,
   "end_elevation_m": 326.19651153523245,
   "min_gradient_pct": -1.6788932465556172,
   "suppressed_max_gradient_pct": 76.90401162063438,
   "suppressed_location_m": [
    0.0,
    5.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 7.675926259016421,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 1412.0,
   "end_distance_m": 1422.0,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.8796112033766,
   "min_gradient_pct": -1.6054226267337413,
   "suppressed_max_gradient_pct": 37.90727805712322,
   "suppressed_location_m": [
    0.0,
    10.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 7.590001115544567,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2912.0,
   "end_distance_m": 2932.0,
   "start_elevation_m": 325.5798640516334,
   "end_elevation_m": 327.09786427474234,
   "min_gradient_pct": -1.3053743688735153,
   "suppressed_max_gradient_pct": 18.441046184517802,
   "suppressed_location_m": [
    0.0,
    20.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 7.533829640083468,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 2907.0,
   "end_distance_m": 2932.0,
   "start_elevation_m": 325.21440686472147,
   "end_elevation_m": 327.09786427474234,
   "min_gradient_pct": -1.2175967118943163,
   "suppressed_max_gradient_pct": 14.59585055761056,
   "suppressed_location_m": [
    0.0,
    25.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 7.277996254083462,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1391.0,
   "end_distance_m": 1441.0,
   "start_elevation_m": 248.61749695950272,
   "end_elevation_m": 252.25649508654445,
   "min_gradient_pct": -0.9905813742047371
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 7.132653943194839,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 983.0,
   "end_distance_m": 1083.0,
   "start_elevation_m": 220.0438638523044,
   "end_elevation_m": 227.17651779549925,
   "min_gradient_pct": -0.5831718822488767
  }
 ],
 "shape": {
  "ascent_concentration": 0.329,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 11.0,
  "shape_class": "sustained"
 },
 "length_m": 3324.977260870946,
 "start_elevation_m": 169.23055165200904,
 "end_elevation_m": 346.11922003767353,
 "endpoint_gain_m": 176.8886683856645,
 "overall_gradient_pct": 5.319996334029972,
 "accumulated_ascent_m": 177.60826914647168,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 7.926169647704455,
   "start_distance_m": 2915.0,
   "end_distance_m": 2920.0,
   "midpoint_distance_m": 2917.5,
   "start_elevation_m": 325.8002030528472,
   "end_elevation_m": 326.19651153523245,
   "start_xy": [
    672283.2033433935,
    4653663.550066245
   ],
   "end_xy": [
    672288.2028691798,
    4653663.524689086
   ]
  },
  "max_10m": {
   "gradient_pct": 7.675926259016421,
   "start_distance_m": 1412.0,
   "end_distance_m": 1422.0,
   "midpoint_distance_m": 1417.0,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.8796112033766,
   "start_xy": [
    671649.7419024803,
    4654478.259578609
   ],
   "end_xy": [
    671648.6313765479,
    4654468.321433301
   ]
  },
  "max_20m": {
   "gradient_pct": 7.590001115544567,
   "start_distance_m": 2912.0,
   "end_distance_m": 2932.0,
   "midpoint_distance_m": 2922.0,
   "start_elevation_m": 325.5798640516334,
   "end_elevation_m": 327.09786427474234,
   "start_xy": [
    672280.2033655315,
    4653663.538541166
   ],
   "end_xy": [
    672300.1995676574,
    4653663.243218594
   ]
  },
  "max_25m": {
   "gradient_pct": 7.533829640083468,
   "start_distance_m": 2907.0,
   "end_distance_m": 2932.0,
   "midpoint_distance_m": 2919.5,
   "start_elevation_m": 325.21440686472147,
   "end_elevation_m": 327.09786427474234,
   "start_xy": [
    672275.2034024281,
    4653663.519332702
   ],
   "end_xy": [
    672300.1995676574,
    4653663.243218594
   ]
  },
  "max_50m": {
   "gradient_pct": 7.277996254083462,
   "start_distance_m": 1391.0,
   "end_distance_m": 1441.0,
   "midpoint_distance_m": 1416.0,
   "start_elevation_m": 248.61749695950272,
   "end_elevation_m": 252.25649508654445,
   "start_xy": [
    671652.0740069381,
    4654499.129683754
   ],
   "end_xy": [
    671646.4908491945,
    4654449.442396082
   ]
  },
  "max_100m": {
   "gradient_pct": 7.132653943194839,
   "start_distance_m": 983.0,
   "end_distance_m": 1083.0,
   "midpoint_distance_m": 1033.0,
   "start_elevation_m": 220.0438638523044,
   "end_elevation_m": 227.17651779549925,
   "start_xy": [
    671697.7716682999,
    4654904.561403309
   ],
   "end_xy": [
    671686.4731786442,
    4654805.202371463
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.6788932465556172,
   "start_distance_m": 30.0,
   "end_distance_m": 35.0,
   "midpoint_distance_m": 32.5,
   "start_elevation_m": 172.80884136132124,
   "end_elevation_m": 172.72489669899346,
   "start_xy": [
    671396.8273021103,
    4655653.19176284
   ],
   "end_xy": [
    671401.770852462,
    4655652.442556648
   ]
  },
  "min_10m": {
   "gradient_pct": -1.6054226267337413,
   "start_distance_m": 24.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 172.89700778245017,
   "end_elevation_m": 172.7364655197768,
   "start_xy": [
    671390.8950416882,
    4655654.090810272
   ],
   "end_xy": [
    671400.7821423917,
    4655652.592397886
   ]
  },
  "min_20m": {
   "gradient_pct": -1.3053743688735153,
   "start_distance_m": 24.0,
   "end_distance_m": 44.0,
   "midpoint_distance_m": 34.0,
   "start_elevation_m": 172.89700778245017,
   "end_elevation_m": 172.63593290867547,
   "start_xy": [
    671390.8950416882,
    4655654.090810272
   ],
   "end_xy": [
    671410.6692430951,
    4655651.0939855
   ]
  },
  "min_25m": {
   "gradient_pct": -1.2175967118943163,
   "start_distance_m": 15.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 27.5,
   "start_elevation_m": 172.9683931770012,
   "end_elevation_m": 172.6639939990276,
   "start_xy": [
    671381.9966510552,
    4655655.439381421
   ],
   "end_xy": [
    671406.7144028137,
    4655651.693350454
   ]
  },
  "min_50m": {
   "gradient_pct": -0.9905813742047371,
   "start_distance_m": 4.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 29.0,
   "start_elevation_m": 173.09043438740653,
   "end_elevation_m": 172.59514370030416,
   "start_xy": [
    671371.1208402814,
    4655657.087635045
   ],
   "end_xy": [
    671420.5563437985,
    4655649.595573113
   ]
  },
  "min_100m": {
   "gradient_pct": -0.5831718822488767,
   "start_distance_m": 4.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 54.0,
   "start_elevation_m": 173.09043438740653,
   "end_elevation_m": 172.50726250515766,
   "start_xy": [
    671371.1208402814,
    4655657.087635045
   ],
   "end_xy": [
    671469.9038508527,
    4655641.57027079
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 8.508125611835737,
   "start_distance_m": 1412.0,
   "end_distance_m": 1414.0,
   "midpoint_distance_m": 1413.0,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.28218108971168,
   "start_xy": [
    671649.7419024803,
    4654478.259578609
   ],
   "end_xy": [
    671649.5197972937,
    4654476.271949547
   ]
  },
  "max_3m": {
   "gradient_pct": 8.326093068883248,
   "start_distance_m": 1412.0,
   "end_distance_m": 1415.0,
   "midpoint_distance_m": 1413.5,
   "start_elevation_m": 250.11201857747497,
   "end_elevation_m": 250.36180136954147,
   "start_xy": [
    671649.7419024803,
    4654478.259578609
   ],
   "end_xy": [
    671649.4087447005,
    4654475.278135017
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    0.0,
    4.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/ct/USGS_1M_18_x67y466_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-08-24T21:38:30+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/connecticut-2026-08-23.osm.pbf",
  "osm_snapshot": "2026-08-22T20:21:28Z",
  "run_id": "redo-ct-6-260824",
  "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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x67y466"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 7.6% over 200 m (Terrain 50), gain 151.5 m over 2867 m way. EXTENDED by graph walk: +0 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (NE wave 1, 2026-08-25): big-gain. 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": "Hartland",
  "county": "Connecticut"
 }
}