{
 "ocl_version": "0.1.0",
 "name": "Russell Stage Road",
 "slug": "russell-stage-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.61835671131388,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 201.92765938772112,
   "min_gradient_pct": -2.34559833010195
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.29428112556309,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 201.98412068726174,
   "min_gradient_pct": -2.2279618069906824
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 16.47476605008137,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 202.0790305559989,
   "min_gradient_pct": -2.2321254046187278
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 11.533383841713771,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 505.0,
   "end_distance_m": 515.0,
   "start_elevation_m": 229.32698430565588,
   "end_elevation_m": 230.48032268982726,
   "min_gradient_pct": -1.8954432465807258
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 11.360463900764728,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1067.0,
   "end_distance_m": 1087.0,
   "start_elevation_m": 275.9159294400144,
   "end_elevation_m": 278.18802222016734,
   "min_gradient_pct": -1.6980240683626846
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 11.340095562581155,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1067.0,
   "end_distance_m": 1092.0,
   "start_elevation_m": 275.9159294400144,
   "end_elevation_m": 278.7509533306597,
   "min_gradient_pct": -1.6477806526444283
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 11.20560342592853,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1054.0,
   "end_distance_m": 1104.0,
   "start_elevation_m": 274.4678163575344,
   "end_elevation_m": 280.07061807049865,
   "min_gradient_pct": -1.3619514451072519
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 10.81034759470532,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1013.0,
   "end_distance_m": 1113.0,
   "start_elevation_m": 270.2366196294336,
   "end_elevation_m": 281.04696722413894,
   "min_gradient_pct": -0.47462351022198845
  }
 ],
 "shape": {
  "ascent_concentration": 0.333,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 99.0,
  "shape_class": "sustained"
 },
 "length_m": 3460.6633314855317,
 "start_elevation_m": 201.25529225349484,
 "end_elevation_m": 424.58320477196935,
 "endpoint_gain_m": 223.3279125184745,
 "overall_gradient_pct": 6.453326750585943,
 "accumulated_ascent_m": 224.13988599282524,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 16.47476605008137,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 202.0790305559989,
   "start_xy": [
    674373.887,
    4671945.185
   ],
   "end_xy": [
    674369.0044796959,
    4671944.107504997
   ]
  },
  "max_10m": {
   "gradient_pct": 11.533383841713771,
   "start_distance_m": 505.0,
   "end_distance_m": 515.0,
   "midpoint_distance_m": 510.0,
   "start_elevation_m": 229.32698430565588,
   "end_elevation_m": 230.48032268982726,
   "start_xy": [
    673971.1802013874,
    4672181.46596705
   ],
   "end_xy": [
    673962.6001946137,
    4672186.602452596
   ]
  },
  "max_20m": {
   "gradient_pct": 11.360463900764728,
   "start_distance_m": 1067.0,
   "end_distance_m": 1087.0,
   "midpoint_distance_m": 1077.0,
   "start_elevation_m": 275.9159294400144,
   "end_elevation_m": 278.18802222016734,
   "start_xy": [
    673425.9528607541,
    4672270.1677010525
   ],
   "end_xy": [
    673406.3046514372,
    4672273.90212637
   ]
  },
  "max_25m": {
   "gradient_pct": 11.340095562581155,
   "start_distance_m": 1067.0,
   "end_distance_m": 1092.0,
   "midpoint_distance_m": 1079.5,
   "start_elevation_m": 275.9159294400144,
   "end_elevation_m": 278.7509533306597,
   "start_xy": [
    673425.9528607541,
    4672270.1677010525
   ],
   "end_xy": [
    673401.3931350405,
    4672274.838612721
   ]
  },
  "max_50m": {
   "gradient_pct": 11.20560342592853,
   "start_distance_m": 1054.0,
   "end_distance_m": 1104.0,
   "midpoint_distance_m": 1079.0,
   "start_elevation_m": 274.4678163575344,
   "end_elevation_m": 280.07061807049865,
   "start_xy": [
    673438.7438659049,
    4672267.846023377
   ],
   "end_xy": [
    673389.6054956887,
    4672277.086179963
   ]
  },
  "max_100m": {
   "gradient_pct": 10.81034759470532,
   "start_distance_m": 1013.0,
   "end_distance_m": 1113.0,
   "midpoint_distance_m": 1063.0,
   "start_elevation_m": 270.2366196294336,
   "end_elevation_m": 281.04696722413894,
   "start_xy": [
    673479.1531602225,
    4672260.942699202
   ],
   "end_xy": [
    673380.7647661748,
    4672278.771855395
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.2321254046187278,
   "start_distance_m": 391.0,
   "end_distance_m": 396.0,
   "midpoint_distance_m": 393.5,
   "start_elevation_m": 225.2462927915546,
   "end_elevation_m": 225.13468652132366,
   "start_xy": [
    674065.4290677042,
    4672117.886089432
   ],
   "end_xy": [
    674061.7316973369,
    4672121.247270741
   ]
  },
  "min_10m": {
   "gradient_pct": -1.8954432465807258,
   "start_distance_m": 386.0,
   "end_distance_m": 396.0,
   "midpoint_distance_m": 391.0,
   "start_elevation_m": 225.32423084598173,
   "end_elevation_m": 225.13468652132366,
   "start_xy": [
    674068.88897039,
    4672114.276508653
   ],
   "end_xy": [
    674061.7316973369,
    4672121.247270741
   ]
  },
  "min_20m": {
   "gradient_pct": -1.6980240683626846,
   "start_distance_m": 377.0,
   "end_distance_m": 397.0,
   "midpoint_distance_m": 387.0,
   "start_elevation_m": 225.46601843837684,
   "end_elevation_m": 225.1264136247043,
   "start_xy": [
    674075.1167952245,
    4672107.779263249
   ],
   "end_xy": [
    674060.9793889844,
    4672121.906081899
   ]
  },
  "min_25m": {
   "gradient_pct": -1.6477806526444283,
   "start_distance_m": 377.0,
   "end_distance_m": 402.0,
   "midpoint_distance_m": 389.5,
   "start_elevation_m": 225.46601843837684,
   "end_elevation_m": 225.05407327521573,
   "start_xy": [
    674075.1167952245,
    4672107.779263249
   ],
   "end_xy": [
    674057.2178472218,
    4672125.2001376925
   ]
  },
  "min_50m": {
   "gradient_pct": -1.3619514451072519,
   "start_distance_m": 373.0,
   "end_distance_m": 423.0,
   "midpoint_distance_m": 398.0,
   "start_elevation_m": 225.50912602590205,
   "end_elevation_m": 224.82815030334842,
   "start_xy": [
    674077.8847173731,
    4672104.891598625
   ],
   "end_xy": [
    674040.8317102483,
    4672138.297648469
   ]
  },
  "min_100m": {
   "gradient_pct": -0.47462351022198845,
   "start_distance_m": 338.0,
   "end_distance_m": 438.0,
   "midpoint_distance_m": 388.0,
   "start_elevation_m": 225.4080854172159,
   "end_elevation_m": 224.9334619069939,
   "start_xy": [
    674099.7769386959,
    4672077.620164456
   ],
   "end_xy": [
    674028.5212811172,
    4672146.84811234
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.61835671131388,
   "start_distance_m": 0.0,
   "end_distance_m": 2.0,
   "midpoint_distance_m": 1.0,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 201.92765938772112,
   "start_xy": [
    674373.887,
    4671945.185
   ],
   "end_xy": [
    674371.9339918784,
    4671944.754001998
   ]
  },
  "max_3m": {
   "gradient_pct": 24.29428112556309,
   "start_distance_m": 0.0,
   "end_distance_m": 3.0,
   "midpoint_distance_m": 1.5,
   "start_elevation_m": 201.25529225349484,
   "end_elevation_m": 201.98412068726174,
   "start_xy": [
    674373.887,
    4671945.185
   ],
   "end_xy": [
    674370.9574878175,
    4671944.538502998
   ]
  }
 },
 "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_x67y468_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:45:51+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": [
   "x67y468"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 11.1% over 200 m (Terrain 50), gain 194.3 m over 2965 m way. EXTENDED by graph walk: +0 segment(s) at base, +5 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. DEDUPE: absorbed 2 overlapping proposal(s): russell-stage-road, schoolhouse-hill-road ADOPTED (NE wave 1, 2026-08-25): big-gain. 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": "Blandford",
  "county": "Massachusetts"
 }
}