{
 "ocl_version": "0.1.0",
 "name": "Mount Greylock (north side)",
 "slug": "mount-greylock-north-side",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 17.105082578888187,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1506.0,
   "end_distance_m": 1508.0,
   "start_elevation_m": 571.1844203371779,
   "end_elevation_m": 571.5265219887557,
   "min_gradient_pct": -4.410020900843392
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 16.844428285871043,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1505.0,
   "end_distance_m": 1508.0,
   "start_elevation_m": 571.0211891401796,
   "end_elevation_m": 571.5265219887557,
   "min_gradient_pct": -4.217314940660799
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 16.6479719799986,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1503.0,
   "end_distance_m": 1508.0,
   "start_elevation_m": 570.6941233897558,
   "end_elevation_m": 571.5265219887557,
   "min_gradient_pct": -4.175325263722698
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 16.574873142516253,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1498.0,
   "end_distance_m": 1508.0,
   "start_elevation_m": 569.8690346745041,
   "end_elevation_m": 571.5265219887557,
   "min_gradient_pct": -3.9641582936030773
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.373220072979393,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1491.0,
   "end_distance_m": 1511.0,
   "start_elevation_m": 568.7272373982104,
   "end_elevation_m": 572.0018814128063,
   "min_gradient_pct": -3.692145090510053
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.233417030886358,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1488.0,
   "end_distance_m": 1513.0,
   "start_elevation_m": 568.2659647630611,
   "end_elevation_m": 572.3243190207827,
   "min_gradient_pct": -3.5240079094160137
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 15.555799849707682,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1477.0,
   "end_distance_m": 1527.0,
   "start_elevation_m": 566.6188147431866,
   "end_elevation_m": 574.3967146680404,
   "min_gradient_pct": -2.847950141578167
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 14.857439799660256,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 555.0,
   "end_distance_m": 655.0,
   "start_elevation_m": 483.9499380834942,
   "end_elevation_m": 498.80737788315446,
   "min_gradient_pct": -1.8032577418978235
  }
 ],
 "shape": {
  "ascent_concentration": 0.334,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 207.0,
  "shape_class": "sustained"
 },
 "length_m": 7798.482306910579,
 "start_elevation_m": 428.2931340335391,
 "end_elevation_m": 952.9794648812426,
 "endpoint_gain_m": 524.6863308477035,
 "overall_gradient_pct": 6.728056950039572,
 "accumulated_ascent_m": 533.4104728473769,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 16.6479719799986,
   "start_distance_m": 1503.0,
   "end_distance_m": 1508.0,
   "midpoint_distance_m": 1505.5,
   "start_elevation_m": 570.6941233897558,
   "end_elevation_m": 571.5265219887557,
   "start_xy": [
    651618.147724651,
    4726213.288855598
   ],
   "end_xy": [
    651613.7454947033,
    4726215.659587867
   ]
  },
  "max_10m": {
   "gradient_pct": 16.574873142516253,
   "start_distance_m": 1498.0,
   "end_distance_m": 1508.0,
   "midpoint_distance_m": 1503.0,
   "start_elevation_m": 569.8690346745041,
   "end_elevation_m": 571.5265219887557,
   "start_xy": [
    651622.7963231202,
    4726211.5099098
   ],
   "end_xy": [
    651613.7454947033,
    4726215.659587867
   ]
  },
  "max_20m": {
   "gradient_pct": 16.373220072979393,
   "start_distance_m": 1491.0,
   "end_distance_m": 1511.0,
   "midpoint_distance_m": 1501.0,
   "start_elevation_m": 568.7272373982104,
   "end_elevation_m": 572.0018814128063,
   "start_xy": [
    651629.652544966,
    4726210.241104254
   ],
   "end_xy": [
    651611.3080110552,
    4726217.406110819
   ]
  },
  "max_25m": {
   "gradient_pct": 16.233417030886358,
   "start_distance_m": 1488.0,
   "end_distance_m": 1513.0,
   "midpoint_distance_m": 1500.5,
   "start_elevation_m": 568.2659647630611,
   "end_elevation_m": 572.3243190207827,
   "start_xy": [
    651632.6287922444,
    4726210.13394119
   ],
   "end_xy": [
    651609.6907457941,
    4726218.58273866
   ]
  },
  "max_50m": {
   "gradient_pct": 15.555799849707682,
   "start_distance_m": 1477.0,
   "end_distance_m": 1527.0,
   "midpoint_distance_m": 1502.0,
   "start_elevation_m": 566.6188147431866,
   "end_elevation_m": 574.3967146680404,
   "start_xy": [
    651643.2363936416,
    4726212.8267921815
   ],
   "end_xy": [
    651598.6132147538,
    4726227.136484752
   ]
  },
  "max_100m": {
   "gradient_pct": 14.857439799660256,
   "start_distance_m": 555.0,
   "end_distance_m": 655.0,
   "midpoint_distance_m": 605.0,
   "start_elevation_m": 483.9499380834942,
   "end_elevation_m": 498.80737788315446,
   "start_xy": [
    651933.4024186113,
    4726552.571098017
   ],
   "end_xy": [
    651874.4235765463,
    4726474.432736358
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.175325263722698,
   "start_distance_m": 6359.0,
   "end_distance_m": 6364.0,
   "midpoint_distance_m": 6361.5,
   "start_elevation_m": 888.2220158860828,
   "end_elevation_m": 888.0132496228966,
   "start_xy": [
    650645.0301714805,
    4723966.96646711
   ],
   "end_xy": [
    650648.1145854818,
    4723963.031545274
   ]
  },
  "min_10m": {
   "gradient_pct": -3.9641582936030773,
   "start_distance_m": 6357.0,
   "end_distance_m": 6367.0,
   "midpoint_distance_m": 6362.0,
   "start_elevation_m": 888.302850209661,
   "end_elevation_m": 887.9064343803007,
   "start_xy": [
    650643.7844756916,
    4723968.531153022
   ],
   "end_xy": [
    650649.930393701,
    4723960.643483191
   ]
  },
  "min_20m": {
   "gradient_pct": -3.692145090510053,
   "start_distance_m": 6356.0,
   "end_distance_m": 6376.0,
   "midpoint_distance_m": 6366.0,
   "start_elevation_m": 888.3297635410447,
   "end_elevation_m": 887.5913345229427,
   "start_xy": [
    650643.1616277973,
    4723969.313495978
   ],
   "end_xy": [
    650655.2901019747,
    4723953.414127848
   ]
  },
  "min_25m": {
   "gradient_pct": -3.5240079094160137,
   "start_distance_m": 6354.0,
   "end_distance_m": 6379.0,
   "midpoint_distance_m": 6366.5,
   "start_elevation_m": 888.3853476834023,
   "end_elevation_m": 887.5043457060483,
   "start_xy": [
    650641.9159320084,
    4723970.87818189
   ],
   "end_xy": [
    650657.0523117014,
    4723950.986244638
   ]
  },
  "min_50m": {
   "gradient_pct": -2.847950141578167,
   "start_distance_m": 6583.0,
   "end_distance_m": 6633.0,
   "midpoint_distance_m": 6608.0,
   "start_elevation_m": 889.2468807674362,
   "end_elevation_m": 887.8229056966471,
   "start_xy": [
    650689.113947352,
    4723758.34692025
   ],
   "end_xy": [
    650700.4207029552,
    4723709.836859672
   ]
  },
  "min_100m": {
   "gradient_pct": -1.8032577418978235,
   "start_distance_m": 3497.0,
   "end_distance_m": 3597.0,
   "midpoint_distance_m": 3547.0,
   "start_elevation_m": 708.5959350969358,
   "end_elevation_m": 706.792677355038,
   "start_xy": [
    650134.0281754768,
    4725792.602775279
   ],
   "end_xy": [
    650146.8214154498,
    4725693.52751902
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 17.105082578888187,
   "start_distance_m": 1506.0,
   "end_distance_m": 1508.0,
   "midpoint_distance_m": 1507.0,
   "start_elevation_m": 571.1844203371779,
   "end_elevation_m": 571.5265219887557,
   "start_xy": [
    651615.5063866824,
    4726214.711294959
   ],
   "end_xy": [
    651613.7454947033,
    4726215.659587867
   ]
  },
  "max_3m": {
   "gradient_pct": 16.844428285871043,
   "start_distance_m": 1505.0,
   "end_distance_m": 1508.0,
   "midpoint_distance_m": 1506.5,
   "start_elevation_m": 571.0211891401796,
   "end_elevation_m": 571.5265219887557,
   "start_xy": [
    651616.3868326719,
    4726214.237148506
   ],
   "end_xy": [
    651613.7454947033,
    4726215.659587867
   ]
  }
 },
 "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"
  ]
 },
 "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_x65y473_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-22T15:00:37+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_ids": [
   9140075,
   8873324,
   517016529
  ],
  "osm_versions": {
   "9140075": 17,
   "8873324": 13,
   "517016529": 7
  },
  "osm_timestamps": {
   "9140075": "2023-08-07 22:10:56+00:00",
   "8873324": "2023-08-07 22:10:56+00:00",
   "517016529": "2023-08-07 22:10:56+00:00"
  },
  "osm_retrieved_at": "2026-08-22T15:00:37+00:00",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "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": [
   "x65y473"
  ],
  "climb_origin": "named",
  "notes": "Notch Road from North Adams + summit approach; BUMPS venue (Greylock Hillclimb). Asphalt throughout (OSM). GNIS Mount Greylock (-73.16594, 42.63718).\n",
  "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": "Massachusetts",
  "county": ""
 }
}