{
 "ocl_version": "0.1.0",
 "name": "Soisalo Road",
 "slug": "soisalo-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.634680547553444,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 146.0,
   "end_distance_m": 148.0,
   "start_elevation_m": 187.49590111077686,
   "end_elevation_m": 187.96859472172792,
   "min_gradient_pct": -17.422973330185698
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.271786044419212,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 146.0,
   "end_distance_m": 149.0,
   "start_elevation_m": 187.49590111077686,
   "end_elevation_m": 188.19405469210943,
   "min_gradient_pct": -11.134571672564183
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.92415094837054,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 145.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 187.29454987165306,
   "end_elevation_m": 188.4407574190716,
   "min_gradient_pct": -1.205497951012262
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.81380599843152,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 140.0,
   "end_distance_m": 150.0,
   "start_elevation_m": 186.25937681922844,
   "end_elevation_m": 188.4407574190716,
   "min_gradient_pct": 1.4566840118786217
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.17278251875078,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 139.0,
   "end_distance_m": 159.0,
   "start_elevation_m": 186.03637038976467,
   "end_elevation_m": 190.27092689351483,
   "min_gradient_pct": 1.5641505939420597
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.871916080194296,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 139.0,
   "end_distance_m": 164.0,
   "start_elevation_m": 186.03637038976467,
   "end_elevation_m": 191.25434940981324,
   "min_gradient_pct": 1.6256227375090475
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.78877965499595,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 138.0,
   "end_distance_m": 188.0,
   "start_elevation_m": 185.85391067881918,
   "end_elevation_m": 195.74830050631715,
   "min_gradient_pct": 1.8929022429641122
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.178749605513303,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "start_elevation_m": 184.1599088895989,
   "end_elevation_m": 201.3386584951122,
   "min_gradient_pct": 3.0359900638022737
  }
 ],
 "shape": {
  "ascent_concentration": 0.39,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 199.0,
  "shape_class": "sustained"
 },
 "length_m": 773.2521412700382,
 "start_elevation_m": 178.52330601649254,
 "end_elevation_m": 256.8186581652416,
 "endpoint_gain_m": 78.29535214874903,
 "overall_gradient_pct": 10.125462054350317,
 "accumulated_ascent_m": 78.69206913721166,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.92415094837054,
   "start_distance_m": 145.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 147.5,
   "start_elevation_m": 187.29454987165306,
   "end_elevation_m": 188.4407574190716,
   "start_xy": [
    666681.5832102196,
    4682946.178115447
   ],
   "end_xy": [
    666679.9885608366,
    4682950.917007021
   ]
  },
  "max_10m": {
   "gradient_pct": 21.81380599843152,
   "start_distance_m": 140.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 145.0,
   "start_elevation_m": 186.25937681922844,
   "end_elevation_m": 188.4407574190716,
   "start_xy": [
    666683.1778596025,
    4682941.439223873
   ],
   "end_xy": [
    666679.9885608366,
    4682950.917007021
   ]
  },
  "max_20m": {
   "gradient_pct": 21.17278251875078,
   "start_distance_m": 139.0,
   "end_distance_m": 159.0,
   "midpoint_distance_m": 149.0,
   "start_elevation_m": 186.03637038976467,
   "end_elevation_m": 190.27092689351483,
   "start_xy": [
    666683.4967894792,
    4682940.491445559
   ],
   "end_xy": [
    666675.9498556489,
    4682958.893008792
   ]
  },
  "max_25m": {
   "gradient_pct": 20.871916080194296,
   "start_distance_m": 139.0,
   "end_distance_m": 164.0,
   "midpoint_distance_m": 151.5,
   "start_elevation_m": 186.03637038976467,
   "end_elevation_m": 191.25434940981324,
   "start_xy": [
    666683.4967894792,
    4682940.491445559
   ],
   "end_xy": [
    666673.2898596405,
    4682963.1267330665
   ]
  },
  "max_50m": {
   "gradient_pct": 19.78877965499595,
   "start_distance_m": 138.0,
   "end_distance_m": 188.0,
   "midpoint_distance_m": 163.0,
   "start_elevation_m": 185.85391067881918,
   "end_elevation_m": 195.74830050631715,
   "start_xy": [
    666683.8157193557,
    4682939.543667244
   ],
   "end_xy": [
    666663.9204936252,
    4682985.13794817
   ]
  },
  "max_100m": {
   "gradient_pct": 17.178749605513303,
   "start_distance_m": 128.0,
   "end_distance_m": 228.0,
   "midpoint_distance_m": 178.0,
   "start_elevation_m": 184.1599088895989,
   "end_elevation_m": 201.3386584951122,
   "start_xy": [
    666686.4650826352,
    4682929.903830285
   ],
   "end_xy": [
    666655.6574046981,
    4683023.642706693
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.205497951012262,
   "start_distance_m": 555.0,
   "end_distance_m": 560.0,
   "midpoint_distance_m": 557.5,
   "start_elevation_m": 236.3063383254744,
   "end_elevation_m": 236.2460634279238,
   "start_xy": [
    666799.7704394545,
    4683312.164327641
   ],
   "end_xy": [
    666802.1602542314,
    4683316.5562276095
   ]
  },
  "min_10m": {
   "gradient_pct": 1.4566840118786217,
   "start_distance_m": 87.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 92.0,
   "start_elevation_m": 182.0459436120215,
   "end_elevation_m": 182.19161201320935,
   "start_xy": [
    666700.3271691907,
    4682891.570414899
   ],
   "end_xy": [
    666695.3073881603,
    4682900.197403965
   ]
  },
  "min_20m": {
   "gradient_pct": 1.5641505939420597,
   "start_distance_m": 87.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 97.0,
   "start_elevation_m": 182.0459436120215,
   "end_elevation_m": 182.3587737308099,
   "start_xy": [
    666700.3271691907,
    4682891.570414899
   ],
   "end_xy": [
    666692.343802533,
    4682909.748171485
   ]
  },
  "min_25m": {
   "gradient_pct": 1.6256227375090475,
   "start_distance_m": 73.0,
   "end_distance_m": 98.0,
   "midpoint_distance_m": 85.5,
   "start_elevation_m": 181.8013827537414,
   "end_elevation_m": 182.20778843811865,
   "start_xy": [
    666707.5794489667,
    4682879.595255691
   ],
   "end_xy": [
    666695.0110295976,
    4682901.152480717
   ]
  },
  "min_50m": {
   "gradient_pct": 1.8929022429641122,
   "start_distance_m": 62.0,
   "end_distance_m": 112.0,
   "midpoint_distance_m": 87.0,
   "start_elevation_m": 181.53552174634663,
   "end_elevation_m": 182.4819728678287,
   "start_xy": [
    666713.2776687905,
    4682870.186202028
   ],
   "end_xy": [
    666690.8620097194,
    4682914.523555245
   ]
  },
  "min_100m": {
   "gradient_pct": 3.0359900638022737,
   "start_distance_m": 17.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 67.0,
   "start_elevation_m": 179.74066893651502,
   "end_elevation_m": 182.7766590003173,
   "start_xy": [
    666728.700625456,
    4682831.659510212
   ],
   "end_xy": [
    666689.3802169057,
    4682919.2989390055
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.634680547553444,
   "start_distance_m": 146.0,
   "end_distance_m": 148.0,
   "midpoint_distance_m": 147.0,
   "start_elevation_m": 187.49590111077686,
   "end_elevation_m": 187.96859472172792,
   "start_xy": [
    666681.264280343,
    4682947.125893761
   ],
   "end_xy": [
    666680.6264205897,
    4682949.021450391
   ]
  },
  "max_3m": {
   "gradient_pct": 23.271786044419212,
   "start_distance_m": 146.0,
   "end_distance_m": 149.0,
   "midpoint_distance_m": 147.5,
   "start_elevation_m": 187.49590111077686,
   "end_elevation_m": 188.19405469210943,
   "start_xy": [
    666681.264280343,
    4682947.125893761
   ],
   "end_xy": [
    666680.3074907132,
    4682949.969228706
   ]
  }
 },
 "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_x66y469_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:57:16+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-3-260824",
  "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": [
   "x66y469"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 9.7% over 200 m (Terrain 50), gain 32.3 m over 374 m way. EXTENDED by graph walk: +4 segment(s) at base, +0 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": "Chester",
  "county": "Massachusetts"
 }
}