{
 "ocl_version": "0.1.0",
 "name": "Massachusetts Avenue",
 "slug": "massachusetts-avenue",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 21.982771295073178,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 124.0,
   "start_elevation_m": 162.76628945640218,
   "end_elevation_m": 163.20594488230364,
   "min_gradient_pct": -3.4872959635251277
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.796612488507588,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "start_elevation_m": 162.76628945640218,
   "end_elevation_m": 163.4201878310574,
   "min_gradient_pct": -3.3829125367759616
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.592354960371836,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 123.0,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 162.9896937373536,
   "min_gradient_pct": -3.2740814157745035
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.378427569997598,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 128.0,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 164.04791874633477,
   "min_gradient_pct": 0.3062484185596759
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.183621153898287,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 118.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 166.14680022011467,
   "min_gradient_pct": 2.769889232779974
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.09861764228151,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "start_elevation_m": 160.8721458095443,
   "end_elevation_m": 166.14680022011467,
   "min_gradient_pct": 3.4157201011437337
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.34453002397663,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 106.0,
   "end_distance_m": 156.0,
   "start_elevation_m": 159.54011042953653,
   "end_elevation_m": 169.71237544152484,
   "min_gradient_pct": 5.475863015914058
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 13.503537434347182,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 56.0,
   "end_distance_m": 156.0,
   "start_elevation_m": 156.20883800717766,
   "end_elevation_m": 169.71237544152484,
   "min_gradient_pct": 6.797244469752599
  }
 ],
 "shape": {
  "ascent_concentration": 0.449,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 64.0,
  "shape_class": "sustained"
 },
 "length_m": 156.88794887374112,
 "start_elevation_m": 151.81322450561572,
 "end_elevation_m": 169.87735931779304,
 "endpoint_gain_m": 18.064134812177315,
 "overall_gradient_pct": 11.514035935745968,
 "accumulated_ascent_m": 18.22783888296604,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.592354960371836,
   "start_distance_m": 118.0,
   "end_distance_m": 123.0,
   "midpoint_distance_m": 120.5,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 162.9896937373536,
   "start_xy": [
    746477.4594649206,
    4665372.011457842
   ],
   "end_xy": [
    746472.5993507049,
    4665373.174651902
   ]
  },
  "max_10m": {
   "gradient_pct": 21.378427569997598,
   "start_distance_m": 118.0,
   "end_distance_m": 128.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 164.04791874633477,
   "start_xy": [
    746477.4594649206,
    4665372.011457842
   ],
   "end_xy": [
    746467.6796797712,
    4665374.067309678
   ]
  },
  "max_20m": {
   "gradient_pct": 21.183621153898287,
   "start_distance_m": 118.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 128.0,
   "start_elevation_m": 161.910075989335,
   "end_elevation_m": 166.14680022011467,
   "start_xy": [
    746477.4594649206,
    4665372.011457842
   ],
   "end_xy": [
    746457.8347458987,
    4665375.815223078
   ]
  },
  "max_25m": {
   "gradient_pct": 21.09861764228151,
   "start_distance_m": 113.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 125.5,
   "start_elevation_m": 160.8721458095443,
   "end_elevation_m": 166.14680022011467,
   "start_xy": [
    746482.2991910453,
    4665370.755650915
   ],
   "end_xy": [
    746457.8347458987,
    4665375.815223078
   ]
  },
  "max_50m": {
   "gradient_pct": 20.34453002397663,
   "start_distance_m": 106.0,
   "end_distance_m": 156.0,
   "midpoint_distance_m": 131.0,
   "start_elevation_m": 159.54011042953653,
   "end_elevation_m": 169.71237544152484,
   "start_xy": [
    746489.0748076199,
    4665368.997521217
   ],
   "end_xy": [
    746439.9385488555,
    4665375.894265814
   ]
  },
  "max_100m": {
   "gradient_pct": 13.503537434347182,
   "start_distance_m": 56.0,
   "end_distance_m": 156.0,
   "midpoint_distance_m": 106.0,
   "start_elevation_m": 156.20883800717766,
   "end_elevation_m": 169.71237544152484,
   "start_xy": [
    746535.3272027408,
    4665350.585949002
   ],
   "end_xy": [
    746439.9385488555,
    4665375.894265814
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.2740814157745035,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 151.81322450561572,
   "end_elevation_m": 151.649520434827,
   "start_xy": [
    746588.204,
    4665332.245
   ],
   "end_xy": [
    746583.422839571,
    4665333.708046462
   ]
  },
  "min_10m": {
   "gradient_pct": 0.3062484185596759,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 151.81322450561572,
   "end_elevation_m": 151.8438493474717,
   "start_xy": [
    746588.204,
    4665332.245
   ],
   "end_xy": [
    746578.641679142,
    4665335.171092926
   ]
  },
  "min_20m": {
   "gradient_pct": 2.769889232779974,
   "start_distance_m": 71.0,
   "end_distance_m": 91.0,
   "midpoint_distance_m": 81.0,
   "start_elevation_m": 157.24673964807548,
   "end_elevation_m": 157.80071749463147,
   "start_xy": [
    746521.8558473805,
    4665357.146919764
   ],
   "end_xy": [
    746503.5235659922,
    4665364.974766295
   ]
  },
  "min_25m": {
   "gradient_pct": 3.4157201011437337,
   "start_distance_m": 68.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 80.5,
   "start_elevation_m": 157.0584053958627,
   "end_elevation_m": 157.91233542114864,
   "start_xy": [
    746524.5138463941,
    4665355.755862165
   ],
   "end_xy": [
    746501.610732823,
    4665365.557023595
   ]
  },
  "min_50m": {
   "gradient_pct": 5.475863015914058,
   "start_distance_m": 45.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 70.0,
   "start_elevation_m": 155.32049579456333,
   "end_elevation_m": 158.05842730252036,
   "start_xy": [
    746545.5424347705,
    4665346.5056261495
   ],
   "end_xy": [
    746499.6851213034,
    4665366.097412598
   ]
  },
  "min_100m": {
   "gradient_pct": 6.797244469752599,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 151.81322450561572,
   "end_elevation_m": 158.61046897536832,
   "start_xy": [
    746588.204,
    4665332.245
   ],
   "end_xy": [
    746494.8710925041,
    4665367.448385107
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 21.982771295073178,
   "start_distance_m": 122.0,
   "end_distance_m": 124.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 162.76628945640218,
   "end_elevation_m": 163.20594488230364,
   "start_xy": [
    746473.5832848917,
    4665372.996120348
   ],
   "end_xy": [
    746471.6154165182,
    4665373.353183458
   ]
  },
  "max_3m": {
   "gradient_pct": 21.796612488507588,
   "start_distance_m": 122.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 123.5,
   "start_elevation_m": 162.76628945640218,
   "end_elevation_m": 163.4201878310574,
   "start_xy": [
    746473.5832848917,
    4665372.996120348
   ],
   "end_xy": [
    746470.6314823314,
    4665373.531715012
   ]
  }
 },
 "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_x74y467_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:42:31+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": "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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x74y467"
  ],
  "climb_origin": "discovered",
  "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": "Southbridge Town",
  "county": "Massachusetts"
 }
}