{
 "ocl_version": "0.1.0",
 "name": "Teal Road",
 "slug": "teal-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.508793363029667,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 95.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 501.77165003001494,
   "end_elevation_m": 502.24182589727553,
   "min_gradient_pct": -5.382529797748248
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.69337217854665,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 94.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 501.56102473191913,
   "end_elevation_m": 502.24182589727553,
   "min_gradient_pct": -5.067664403920465
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.265773516160152,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 92.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 501.1285372214675,
   "end_elevation_m": 502.24182589727553,
   "min_gradient_pct": -4.287421007128387
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.024985583889816,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 87.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 500.03932733888655,
   "end_elevation_m": 502.24182589727553,
   "min_gradient_pct": -3.5166130492433467
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.365734220318302,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 85.0,
   "end_distance_m": 105.0,
   "start_elevation_m": 499.6158891201772,
   "end_elevation_m": 503.88903596424086,
   "min_gradient_pct": -1.3205491908553313
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.118398532009678,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 79.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 498.4145360723195,
   "end_elevation_m": 503.6941357053219,
   "min_gradient_pct": -0.7744963451916647
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.814260975155207,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 57.0,
   "end_distance_m": 107.0,
   "start_elevation_m": 494.3470454925491,
   "end_elevation_m": 504.2541759801267,
   "min_gradient_pct": 1.8984020423172296
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.8370432259606,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 25.0,
   "end_distance_m": 125.0,
   "start_elevation_m": 489.6421169543333,
   "end_elevation_m": 506.4791601802939,
   "min_gradient_pct": 4.128039679969618
  }
 ],
 "shape": {
  "ascent_concentration": 0.451,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 103.0,
  "shape_class": "stepped"
 },
 "length_m": 249.2217386576448,
 "start_elevation_m": 487.75460881687815,
 "end_elevation_m": 512.6328038513141,
 "endpoint_gain_m": 24.87819503443592,
 "overall_gradient_pct": 9.98235353321687,
 "accumulated_ascent_m": 25.303649929610117,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.265773516160152,
   "start_distance_m": 92.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 94.5,
   "start_elevation_m": 501.1285372214675,
   "end_elevation_m": 502.24182589727553,
   "start_xy": [
    648834.5254797618,
    4683590.928792403
   ],
   "end_xy": [
    648836.6465527399,
    4683595.45660086
   ]
  },
  "max_10m": {
   "gradient_pct": 22.024985583889816,
   "start_distance_m": 87.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 92.0,
   "start_elevation_m": 500.03932733888655,
   "end_elevation_m": 502.24182589727553,
   "start_xy": [
    648832.4044067835,
    4683586.400983946
   ],
   "end_xy": [
    648836.6465527399,
    4683595.45660086
   ]
  },
  "max_20m": {
   "gradient_pct": 21.365734220318302,
   "start_distance_m": 85.0,
   "end_distance_m": 105.0,
   "midpoint_distance_m": 95.0,
   "start_elevation_m": 499.6158891201772,
   "end_elevation_m": 503.88903596424086,
   "start_xy": [
    648831.5559775922,
    4683584.589860563
   ],
   "end_xy": [
    648840.040269505,
    4683602.701094391
   ]
  },
  "max_25m": {
   "gradient_pct": 21.118398532009678,
   "start_distance_m": 79.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 91.5,
   "start_elevation_m": 498.4145360723195,
   "end_elevation_m": 503.6941357053219,
   "start_xy": [
    648829.0106900184,
    4683579.156490415
   ],
   "end_xy": [
    648839.6160549094,
    4683601.795532699
   ]
  },
  "max_50m": {
   "gradient_pct": 19.814260975155207,
   "start_distance_m": 57.0,
   "end_distance_m": 107.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 494.3470454925491,
   "end_elevation_m": 504.2541759801267,
   "start_xy": [
    648819.6693091916,
    4683559.238233242
   ],
   "end_xy": [
    648840.8886986963,
    4683604.512217773
   ]
  },
  "max_100m": {
   "gradient_pct": 16.8370432259606,
   "start_distance_m": 25.0,
   "end_distance_m": 125.0,
   "midpoint_distance_m": 75.0,
   "start_elevation_m": 489.6421169543333,
   "end_elevation_m": 506.4791601802939,
   "start_xy": [
    648805.8574517742,
    4683530.37246468
   ],
   "end_xy": [
    648857.115225677,
    4683608.008027074
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.287421007128387,
   "start_distance_m": 163.0,
   "end_distance_m": 168.0,
   "midpoint_distance_m": 165.5,
   "start_elevation_m": 508.85480832786175,
   "end_elevation_m": 508.6404372775053,
   "start_xy": [
    648893.9121891174,
    4683600.122684306
   ],
   "end_xy": [
    648898.7100129555,
    4683598.715244638
   ]
  },
  "min_10m": {
   "gradient_pct": -3.5166130492433467,
   "start_distance_m": 162.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 167.0,
   "start_elevation_m": 508.86392262292253,
   "end_elevation_m": 508.5122613179982,
   "start_xy": [
    648892.9526243497,
    4683600.40417224
   ],
   "end_xy": [
    648902.6881051196,
    4683598.546749994
   ]
  },
  "min_20m": {
   "gradient_pct": -1.3205491908553313,
   "start_distance_m": 162.0,
   "end_distance_m": 182.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 508.86392262292253,
   "end_elevation_m": 508.59981278475146,
   "start_xy": [
    648892.9526243497,
    4683600.40417224
   ],
   "end_xy": [
    648912.6879947772,
    4683598.4997730255
   ]
  },
  "min_25m": {
   "gradient_pct": -0.7744963451916647,
   "start_distance_m": 162.0,
   "end_distance_m": 187.0,
   "midpoint_distance_m": 174.5,
   "start_elevation_m": 508.86392262292253,
   "end_elevation_m": 508.6702985366246,
   "start_xy": [
    648892.9526243497,
    4683600.40417224
   ],
   "end_xy": [
    648917.687939606,
    4683598.476284542
   ]
  },
  "min_50m": {
   "gradient_pct": 1.8984020423172296,
   "start_distance_m": 144.0,
   "end_distance_m": 194.0,
   "midpoint_distance_m": 169.0,
   "start_elevation_m": 508.0382030536276,
   "end_elevation_m": 508.98740407478624,
   "start_xy": [
    648875.6804585326,
    4683605.470955044
   ],
   "end_xy": [
    648924.6878623663,
    4683598.443400664
   ]
  },
  "min_100m": {
   "gradient_pct": 4.128039679969618,
   "start_distance_m": 135.0,
   "end_distance_m": 235.0,
   "midpoint_distance_m": 185.0,
   "start_elevation_m": 507.4514875004355,
   "end_elevation_m": 511.57952718040514,
   "start_xy": [
    648867.0443756242,
    4683608.004346446
   ],
   "end_xy": [
    648964.457909397,
    4683593.180605187
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.508793363029667,
   "start_distance_m": 95.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 96.0,
   "start_elevation_m": 501.77165003001494,
   "end_elevation_m": 502.24182589727553,
   "start_xy": [
    648835.7981235486,
    4683593.6454774765
   ],
   "end_xy": [
    648836.6465527399,
    4683595.45660086
   ]
  },
  "max_3m": {
   "gradient_pct": 22.69337217854665,
   "start_distance_m": 94.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 95.5,
   "start_elevation_m": 501.56102473191913,
   "end_elevation_m": 502.24182589727553,
   "start_xy": [
    648835.373908953,
    4683592.739915785
   ],
   "end_xy": [
    648836.6465527399,
    4683595.45660086
   ]
  }
 },
 "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_x64y469_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-08-24T21:51:28+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": "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": [
   "x64y469"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.9% over 200 m (Terrain 50), gain 24.4 m over 249 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). 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": "Lee",
  "county": "Massachusetts"
 }
}