{
 "ocl_version": "0.1.0",
 "name": "Rossiter Road",
 "slug": "rossiter-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.81472369183757,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1041.0,
   "end_distance_m": 1043.0,
   "start_elevation_m": 355.7270102062999,
   "end_elevation_m": 356.24330468013665,
   "min_gradient_pct": -22.055180954805564
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.864596017896627,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1046.0,
   "end_distance_m": 1049.0,
   "start_elevation_m": 356.71410582909084,
   "end_elevation_m": 357.43004370962774,
   "min_gradient_pct": -21.16174499232102
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.516747465518847,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1046.0,
   "end_distance_m": 1051.0,
   "start_elevation_m": 356.71410582909084,
   "end_elevation_m": 357.8399432023668,
   "min_gradient_pct": -19.505802508122088
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.451773464967232,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1039.0,
   "end_distance_m": 1049.0,
   "start_elevation_m": 355.284866363131,
   "end_elevation_m": 357.43004370962774,
   "min_gradient_pct": -16.50588349817042
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.466901374560393,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1039.0,
   "end_distance_m": 1059.0,
   "start_elevation_m": 355.284866363131,
   "end_elevation_m": 359.3782466380431,
   "min_gradient_pct": -11.494800788395878
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.060817865662557,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1035.0,
   "end_distance_m": 1060.0,
   "start_elevation_m": 354.57825944706855,
   "end_elevation_m": 359.5934639134842,
   "min_gradient_pct": -10.300449574036293
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.155449546359023,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1030.0,
   "end_distance_m": 1080.0,
   "start_elevation_m": 353.754124435281,
   "end_elevation_m": 362.83184920846054,
   "min_gradient_pct": -9.877897257771565
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.927373592834726,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1013.0,
   "end_distance_m": 1113.0,
   "start_elevation_m": 351.7766756045203,
   "end_elevation_m": 365.704049197355,
   "min_gradient_pct": -9.228314028927798
  }
 ],
 "shape": {
  "ascent_concentration": 0.432,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 83.0,
  "shape_class": "sustained"
 },
 "length_m": 1840.782352382392,
 "start_elevation_m": 337.13553952331387,
 "end_elevation_m": 418.42163112533933,
 "endpoint_gain_m": 81.28609160202546,
 "overall_gradient_pct": 4.415844789951551,
 "accumulated_ascent_m": 100.43448761433984,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.516747465518847,
   "start_distance_m": 1046.0,
   "end_distance_m": 1051.0,
   "midpoint_distance_m": 1048.5,
   "start_elevation_m": 356.71410582909084,
   "end_elevation_m": 357.8399432023668,
   "start_xy": [
    632355.9927738174,
    4693174.289988113
   ],
   "end_xy": [
    632351.0756149985,
    4693173.465423112
   ]
  },
  "max_10m": {
   "gradient_pct": 21.451773464967232,
   "start_distance_m": 1039.0,
   "end_distance_m": 1049.0,
   "midpoint_distance_m": 1044.0,
   "start_elevation_m": 355.284866363131,
   "end_elevation_m": 357.43004370962774,
   "start_xy": [
    632362.601048196,
    4693176.481203341
   ],
   "end_xy": [
    632353.0581998787,
    4693173.666870308
   ]
  },
  "max_20m": {
   "gradient_pct": 20.466901374560393,
   "start_distance_m": 1039.0,
   "end_distance_m": 1059.0,
   "midpoint_distance_m": 1049.0,
   "start_elevation_m": 355.284866363131,
   "end_elevation_m": 359.3782466380431,
   "start_xy": [
    632362.601048196,
    4693176.481203341
   ],
   "end_xy": [
    632343.079509537,
    4693173.2218613755
   ]
  },
  "max_25m": {
   "gradient_pct": 20.060817865662557,
   "start_distance_m": 1035.0,
   "end_distance_m": 1060.0,
   "midpoint_distance_m": 1047.5,
   "start_elevation_m": 354.57825944706855,
   "end_elevation_m": 359.5934639134842,
   "start_xy": [
    632366.14353638,
    4693178.322543887
   ],
   "end_xy": [
    632342.0796883247,
    4693173.2029525535
   ]
  },
  "max_50m": {
   "gradient_pct": 18.155449546359023,
   "start_distance_m": 1030.0,
   "end_distance_m": 1080.0,
   "midpoint_distance_m": 1055.0,
   "start_elevation_m": 353.754124435281,
   "end_elevation_m": 362.83184920846054,
   "start_xy": [
    632370.3372955364,
    4693181.029799197
   ],
   "end_xy": [
    632322.0822263195,
    4693172.9645090215
   ]
  },
  "max_100m": {
   "gradient_pct": 13.927373592834726,
   "start_distance_m": 1013.0,
   "end_distance_m": 1113.0,
   "midpoint_distance_m": 1063.0,
   "start_elevation_m": 351.7766756045203,
   "end_elevation_m": 365.704049197355,
   "start_xy": [
    632381.7898315375,
    4693193.46739512
   ],
   "end_xy": [
    632289.0884949572,
    4693172.547437667
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -19.505802508122088,
   "start_distance_m": 1311.0,
   "end_distance_m": 1316.0,
   "midpoint_distance_m": 1313.5,
   "start_elevation_m": 376.5382754087552,
   "end_elevation_m": 375.5629852833491,
   "start_xy": [
    632091.1971775937,
    4693176.896640778
   ],
   "end_xy": [
    632086.2062401915,
    4693176.595735732
   ]
  },
  "min_10m": {
   "gradient_pct": -16.50588349817042,
   "start_distance_m": 1310.0,
   "end_distance_m": 1320.0,
   "midpoint_distance_m": 1315.0,
   "start_elevation_m": 376.67765974386214,
   "end_elevation_m": 375.0270713940451,
   "start_xy": [
    632092.1953650742,
    4693176.956821787
   ],
   "end_xy": [
    632082.2447641124,
    4693176.046786148
   ]
  },
  "min_20m": {
   "gradient_pct": -11.494800788395878,
   "start_distance_m": 1308.0,
   "end_distance_m": 1328.0,
   "midpoint_distance_m": 1318.0,
   "start_elevation_m": 376.7941162376269,
   "end_elevation_m": 374.4951560799477,
   "start_xy": [
    632094.1919623861,
    4693177.071561513
   ],
   "end_xy": [
    632074.3597949903,
    4693174.713427245
   ]
  },
  "min_25m": {
   "gradient_pct": -10.300449574036293,
   "start_distance_m": 213.0,
   "end_distance_m": 238.0,
   "midpoint_distance_m": 225.5,
   "start_elevation_m": 329.48063279250294,
   "end_elevation_m": 326.9055203989939,
   "start_xy": [
    633138.6858133089,
    4693179.947595516
   ],
   "end_xy": [
    633113.6939545781,
    4693179.309632207
   ]
  },
  "min_50m": {
   "gradient_pct": -9.877897257771565,
   "start_distance_m": 196.0,
   "end_distance_m": 246.0,
   "midpoint_distance_m": 221.0,
   "start_elevation_m": 331.09555269285266,
   "end_elevation_m": 326.1566040639669,
   "start_xy": [
    633155.6838811109,
    4693180.097726298
   ],
   "end_xy": [
    633105.6965597844,
    4693179.105483948
   ]
  },
  "min_100m": {
   "gradient_pct": -9.228314028927798,
   "start_distance_m": 158.0,
   "end_distance_m": 258.0,
   "midpoint_distance_m": 208.0,
   "start_elevation_m": 334.368821530793,
   "end_elevation_m": 325.1405075018652,
   "start_xy": [
    633193.6836823232,
    4693180.143237603
   ],
   "end_xy": [
    633093.7004675936,
    4693178.799261561
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.81472369183757,
   "start_distance_m": 1041.0,
   "end_distance_m": 1043.0,
   "midpoint_distance_m": 1042.0,
   "start_elevation_m": 355.7270102062999,
   "end_elevation_m": 356.24330468013665,
   "start_xy": [
    632360.7731512086,
    4693175.669542941
   ],
   "end_xy": [
    632358.9273477561,
    4693174.913105917
   ]
  },
  "max_3m": {
   "gradient_pct": 23.864596017896627,
   "start_distance_m": 1046.0,
   "end_distance_m": 1049.0,
   "midpoint_distance_m": 1047.5,
   "start_elevation_m": 356.71410582909084,
   "end_elevation_m": 357.43004370962774,
   "start_xy": [
    632355.9927738174,
    4693174.289988113
   ],
   "end_xy": [
    632353.0581998787,
    4693173.666870308
   ]
  }
 },
 "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_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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ma/USGS_1M_18_x63y470_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:51:03+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "redo-ma-2-260824",
  "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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x63y470"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.9% over 200 m (Terrain 50), gain 75.1 m over 1776 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 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): 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": "Richmond",
  "county": "Massachusetts"
 }
}