{
 "ocl_version": "0.1.0",
 "name": "Discovered lane (42.6985, -72.6908)",
 "slug": "discovered-lane-42-6985-72-6908",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.73199332750113,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 8.0,
   "end_distance_m": 10.0,
   "start_elevation_m": 200.2485076573754,
   "end_elevation_m": 201.14314752392542,
   "min_gradient_pct": -5.5334169623293405
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 36.74936277248927,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 8.0,
   "end_distance_m": 11.0,
   "start_elevation_m": 200.2485076573754,
   "end_elevation_m": 201.35098854055008,
   "min_gradient_pct": -4.30761342514927
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 28.95071355028108,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 7.0,
   "end_distance_m": 12.0,
   "start_elevation_m": 200.05557814458632,
   "end_elevation_m": 201.50311382210037,
   "min_gradient_pct": -2.9265423955365577
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.490732382742976,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 121.0,
   "end_distance_m": 131.0,
   "start_elevation_m": 213.20621433874118,
   "end_elevation_m": 215.85528757701547,
   "min_gradient_pct": -1.0742890592172216
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.083832907353155,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 112.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 211.27335341187882,
   "end_elevation_m": 216.09011999334945,
   "min_gradient_pct": 0.9056425854107886
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.991715022501126,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 106.0,
   "end_distance_m": 131.0,
   "start_elevation_m": 210.1073588213902,
   "end_elevation_m": 215.85528757701547,
   "min_gradient_pct": 0.729825011394496
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.09240113827593,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 102.0,
   "end_distance_m": 152.0,
   "start_elevation_m": 209.2917255701299,
   "end_elevation_m": 218.83792613926786,
   "min_gradient_pct": 3.8986317350763784
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.7068185414511,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 101.0,
   "end_distance_m": 201.0,
   "start_elevation_m": 209.11219483252353,
   "end_elevation_m": 225.81901337397463,
   "min_gradient_pct": 8.440392381923289
  }
 ],
 "shape": {
  "ascent_concentration": 0.376,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 67.0,
  "shape_class": "sustained"
 },
 "length_m": 329.75480870762254,
 "start_elevation_m": 199.42626849768072,
 "end_elevation_m": 238.55110737095185,
 "endpoint_gain_m": 39.12483887327113,
 "overall_gradient_pct": 11.864827392998295,
 "accumulated_ascent_m": 39.590376645115015,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 28.95071355028108,
   "start_distance_m": 7.0,
   "end_distance_m": 12.0,
   "midpoint_distance_m": 9.5,
   "start_elevation_m": 200.05557814458632,
   "end_elevation_m": 201.50311382210037,
   "start_xy": [
    689150.9978318005,
    4729924.632256874
   ],
   "end_xy": [
    689154.0235541975,
    4729928.565118913
   ]
  },
  "max_10m": {
   "gradient_pct": 26.490732382742976,
   "start_distance_m": 121.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 126.0,
   "start_elevation_m": 213.20621433874118,
   "end_elevation_m": 215.85528757701547,
   "start_xy": [
    689213.8878081057,
    4730012.723991837
   ],
   "end_xy": [
    689223.0807311313,
    4730016.653587859
   ]
  },
  "max_20m": {
   "gradient_pct": 24.083832907353155,
   "start_distance_m": 112.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 211.27335341187882,
   "end_elevation_m": 216.09011999334945,
   "start_xy": [
    689205.371335344,
    4730009.861706743
   ],
   "end_xy": [
    689223.9935200453,
    4730017.062019492
   ]
  },
  "max_25m": {
   "gradient_pct": 22.991715022501126,
   "start_distance_m": 106.0,
   "end_distance_m": 131.0,
   "midpoint_distance_m": 118.5,
   "start_elevation_m": 210.1073588213902,
   "end_elevation_m": 215.85528757701547,
   "start_xy": [
    689199.5664895201,
    4730008.34760614
   ],
   "end_xy": [
    689223.0807311313,
    4730016.653587859
   ]
  },
  "max_50m": {
   "gradient_pct": 19.09240113827593,
   "start_distance_m": 102.0,
   "end_distance_m": 152.0,
   "midpoint_distance_m": 127.0,
   "start_elevation_m": 209.2917255701299,
   "end_elevation_m": 218.83792613926786,
   "start_xy": [
    689196.0467750466,
    4730006.447182497
   ],
   "end_xy": [
    689240.008764853,
    4730028.790693439
   ]
  },
  "max_100m": {
   "gradient_pct": 16.7068185414511,
   "start_distance_m": 101.0,
   "end_distance_m": 201.0,
   "midpoint_distance_m": 151.0,
   "start_elevation_m": 209.11219483252353,
   "end_elevation_m": 225.81901337397463,
   "start_xy": [
    689195.2163238684,
    4730005.902340617
   ],
   "end_xy": [
    689271.052362323,
    4730066.60767347
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.9265423955365577,
   "start_distance_m": 310.0,
   "end_distance_m": 315.0,
   "midpoint_distance_m": 312.5,
   "start_elevation_m": 238.1145435931628,
   "end_elevation_m": 237.96821647338598,
   "start_xy": [
    689330.353172346,
    4730156.122848631
   ],
   "end_xy": [
    689330.1617983043,
    4730161.107846915
   ]
  },
  "min_10m": {
   "gradient_pct": -1.0742890592172216,
   "start_distance_m": 309.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 314.0,
   "start_elevation_m": 238.12606131043145,
   "end_elevation_m": 238.01863240450973,
   "start_xy": [
    689330.2539633117,
    4730155.127782016
   ],
   "end_xy": [
    689329.8770231345,
    4730165.0976969255
   ]
  },
  "min_20m": {
   "gradient_pct": 0.9056425854107886,
   "start_distance_m": 73.0,
   "end_distance_m": 93.0,
   "midpoint_distance_m": 83.0,
   "start_elevation_m": 208.24979274657122,
   "end_elevation_m": 208.43092126365337,
   "start_xy": [
    689185.1391413074,
    4729980.392888684
   ],
   "end_xy": [
    689190.3532602272,
    4729999.630437225
   ]
  },
  "min_25m": {
   "gradient_pct": 0.729825011394496,
   "start_distance_m": 69.0,
   "end_distance_m": 94.0,
   "midpoint_distance_m": 81.5,
   "start_elevation_m": 208.25575123809307,
   "end_elevation_m": 208.4382074909417,
   "start_xy": [
    689183.9544737809,
    4729976.583850565
   ],
   "end_xy": [
    689190.7699459619,
    4730000.534167252
   ]
  },
  "min_50m": {
   "gradient_pct": 3.8986317350763784,
   "start_distance_m": 45.0,
   "end_distance_m": 95.0,
   "midpoint_distance_m": 70.0,
   "start_elevation_m": 206.58898060070135,
   "end_elevation_m": 208.53829646823954,
   "start_xy": [
    689173.563189395,
    4729954.974924661
   ],
   "end_xy": [
    689191.3415130746,
    4730001.3547225725
   ]
  },
  "min_100m": {
   "gradient_pct": 8.440392381923289,
   "start_distance_m": 229.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 279.0,
   "start_elevation_m": 230.0754535113988,
   "end_elevation_m": 238.51584589332208,
   "start_xy": [
    689289.3517814376,
    4730087.799179756
   ],
   "end_xy": [
    689329.2448150935,
    4730175.077644485
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.73199332750113,
   "start_distance_m": 8.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 9.0,
   "start_elevation_m": 200.2485076573754,
   "end_elevation_m": 201.14314752392542,
   "start_xy": [
    689151.706095558,
    4729925.338204782
   ],
   "end_xy": [
    689152.995070274,
    4729926.849828611
   ]
  },
  "max_3m": {
   "gradient_pct": 36.74936277248927,
   "start_distance_m": 8.0,
   "end_distance_m": 11.0,
   "midpoint_distance_m": 9.5,
   "start_elevation_m": 200.2485076573754,
   "end_elevation_m": 201.35098854055008,
   "start_xy": [
    689151.706095558,
    4729925.338204782
   ],
   "end_xy": [
    689153.5093122358,
    4729927.707473762
   ]
  }
 },
 "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_x68y473_MA_Western_B24.tif",
   "data/cache/usa/ma/USGS_1M_18_x68y474_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:43:28+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": [
   "x68y473",
   "x68y474"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: NY_Region2Lot1-FEMA_2012: EPT covers only 48% of stations",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Colrain",
  "county": "Massachusetts"
 }
}