{
 "ocl_version": "0.1.0",
 "name": "Old County Road",
 "slug": "old-county-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.68104782510051,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1038.0,
   "end_distance_m": 1040.0,
   "start_elevation_m": 232.958595118069,
   "end_elevation_m": 233.61221607457102,
   "min_gradient_pct": -29.644011025953887
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.581654860414613,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1037.0,
   "end_distance_m": 1040.0,
   "start_elevation_m": 232.72476642875858,
   "end_elevation_m": 233.61221607457102,
   "min_gradient_pct": -26.358752925879497
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 27.99371795149284,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1035.0,
   "end_distance_m": 1040.0,
   "start_elevation_m": 232.21253017699638,
   "end_elevation_m": 233.61221607457102,
   "min_gradient_pct": -24.55783994470039
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.584685359988327,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1031.0,
   "end_distance_m": 1041.0,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 233.74208102001768,
   "min_gradient_pct": -20.126263462729526
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.222507368075014,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1029.0,
   "end_distance_m": 1049.0,
   "start_elevation_m": 231.09706426812573,
   "end_elevation_m": 235.34156574174074,
   "min_gradient_pct": -19.083638552299362
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.447633521247894,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1031.0,
   "end_distance_m": 1056.0,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 236.39552086433082,
   "min_gradient_pct": -16.379374942029926
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.539753930968516,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 581.0,
   "end_distance_m": 631.0,
   "start_elevation_m": 200.76634459572404,
   "end_elevation_m": 210.0362215612083,
   "min_gradient_pct": -11.830256987243956
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.65014209065103,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1031.0,
   "end_distance_m": 1131.0,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 248.93375457466988,
   "min_gradient_pct": -7.092124051065184
  }
 ],
 "shape": {
  "ascent_concentration": 0.387,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "sustained"
 },
 "length_m": 2429.0000000001396,
 "start_elevation_m": 146.57005958555283,
 "end_elevation_m": 309.2373796055955,
 "endpoint_gain_m": 162.66732002004267,
 "overall_gradient_pct": 6.696884315357485,
 "accumulated_ascent_m": 184.20099613303435,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 27.99371795149284,
   "start_distance_m": 1035.0,
   "end_distance_m": 1040.0,
   "midpoint_distance_m": 1037.5,
   "start_elevation_m": 232.21253017699638,
   "end_elevation_m": 233.61221607457102,
   "start_xy": [
    715768.5259010702,
    4718560.513859475
   ],
   "end_xy": [
    715767.3586089942,
    4718555.65202554
   ]
  },
  "max_10m": {
   "gradient_pct": 24.584685359988327,
   "start_distance_m": 1031.0,
   "end_distance_m": 1041.0,
   "midpoint_distance_m": 1036.0,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 233.74208102001768,
   "start_xy": [
    715769.5817532644,
    4718564.371836427
   ],
   "end_xy": [
    715767.1251505789,
    4718554.679658754
   ]
  },
  "max_20m": {
   "gradient_pct": 21.222507368075014,
   "start_distance_m": 1029.0,
   "end_distance_m": 1049.0,
   "midpoint_distance_m": 1039.0,
   "start_elevation_m": 231.09706426812573,
   "end_elevation_m": 235.34156574174074,
   "start_xy": [
    715770.1142511114,
    4718566.299645038
   ],
   "end_xy": [
    715765.2807363124,
    4718546.895191606
   ]
  },
  "max_25m": {
   "gradient_pct": 20.447633521247894,
   "start_distance_m": 1031.0,
   "end_distance_m": 1056.0,
   "midpoint_distance_m": 1043.5,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 236.39552086433082,
   "start_xy": [
    715769.5817532644,
    4718564.371836427
   ],
   "end_xy": [
    715763.3878064046,
    4718540.156444873
   ]
  },
  "max_50m": {
   "gradient_pct": 18.539753930968516,
   "start_distance_m": 581.0,
   "end_distance_m": 631.0,
   "midpoint_distance_m": 606.0,
   "start_elevation_m": 200.76634459572404,
   "end_elevation_m": 210.0362215612083,
   "start_xy": [
    716102.8412160274,
    4718854.678095916
   ],
   "end_xy": [
    716066.9950272562,
    4718820.001191323
   ]
  },
  "max_100m": {
   "gradient_pct": 17.65014209065103,
   "start_distance_m": 1031.0,
   "end_distance_m": 1131.0,
   "midpoint_distance_m": 1081.0,
   "start_elevation_m": 231.28361248401885,
   "end_elevation_m": 248.93375457466988,
   "start_xy": [
    715769.5817532644,
    4718564.371836427
   ],
   "end_xy": [
    715764.971359723,
    4718465.830997504
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -24.55783994470039,
   "start_distance_m": 1993.0,
   "end_distance_m": 1998.0,
   "midpoint_distance_m": 1995.5,
   "start_elevation_m": 300.7337630738267,
   "end_elevation_m": 299.5058710765917,
   "start_xy": [
    715495.0423533188,
    4717655.003301495
   ],
   "end_xy": [
    715492.6203886359,
    4717650.62904875
   ]
  },
  "min_10m": {
   "gradient_pct": -20.126263462729526,
   "start_distance_m": 1990.0,
   "end_distance_m": 2000.0,
   "midpoint_distance_m": 1995.0,
   "start_elevation_m": 301.2070751415858,
   "end_elevation_m": 299.19444879531284,
   "start_xy": [
    715496.4955321285,
    4717657.627853141
   ],
   "end_xy": [
    715491.6516027629,
    4717648.879347652
   ]
  },
  "min_20m": {
   "gradient_pct": -19.083638552299362,
   "start_distance_m": 1979.0,
   "end_distance_m": 1999.0,
   "midpoint_distance_m": 1989.0,
   "start_elevation_m": 303.12471641979425,
   "end_elevation_m": 299.3079887093344,
   "start_xy": [
    715497.449052219,
    4717668.5262425905
   ],
   "end_xy": [
    715492.1359956993,
    4717649.754198201
   ]
  },
  "min_25m": {
   "gradient_pct": -16.379374942029926,
   "start_distance_m": 1977.0,
   "end_distance_m": 2002.0,
   "midpoint_distance_m": 1989.5,
   "start_elevation_m": 303.1913812246307,
   "end_elevation_m": 299.0965374891232,
   "start_xy": [
    715497.8633587064,
    4717670.480159163
   ],
   "end_xy": [
    715490.6828168897,
    4717647.129646554
   ]
  },
  "min_50m": {
   "gradient_pct": -11.830256987243956,
   "start_distance_m": 1952.0,
   "end_distance_m": 2002.0,
   "midpoint_distance_m": 1977.0,
   "start_elevation_m": 305.01166598274517,
   "end_elevation_m": 299.0965374891232,
   "start_xy": [
    715507.2584497234,
    4717693.4466017615
   ],
   "end_xy": [
    715490.6828168897,
    4717647.129646554
   ]
  },
  "min_100m": {
   "gradient_pct": -7.092124051065184,
   "start_distance_m": 1952.0,
   "end_distance_m": 2052.0,
   "midpoint_distance_m": 2002.0,
   "start_elevation_m": 305.01166598274517,
   "end_elevation_m": 297.91954193168,
   "start_xy": [
    715507.2584497234,
    4717693.4466017615
   ],
   "end_xy": [
    715466.520142954,
    4717603.552816057
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.68104782510051,
   "start_distance_m": 1038.0,
   "end_distance_m": 1040.0,
   "midpoint_distance_m": 1039.0,
   "start_elevation_m": 232.958595118069,
   "end_elevation_m": 233.61221607457102,
   "start_xy": [
    715767.8255258246,
    4718557.596759114
   ],
   "end_xy": [
    715767.3586089942,
    4718555.65202554
   ]
  },
  "max_3m": {
   "gradient_pct": 29.581654860414613,
   "start_distance_m": 1037.0,
   "end_distance_m": 1040.0,
   "midpoint_distance_m": 1038.5,
   "start_elevation_m": 232.72476642875858,
   "end_elevation_m": 233.61221607457102,
   "start_xy": [
    715768.0589842398,
    4718558.569125902
   ],
   "end_xy": [
    715767.3586089942,
    4718555.65202554
   ]
  }
 },
 "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": {
  "no_bench_suppression": {
   "masked_fraction": 0.181,
   "windows_resited": [],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.962,
   "obstruction_max_height_m": 32.97,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    170.0,
    210.0
   ],
   [
    360.0,
    440.0
   ],
   [
    640.0,
    670.0
   ],
   [
    1180.0,
    1220.0
   ],
   [
    1350.0,
    1390.0
   ],
   [
    1560.0,
    1630.0
   ],
   [
    1640.0,
    1690.0
   ],
   [
    1920.0,
    1960.0
   ],
   [
    2340.0,
    2380.0
   ]
  ],
  "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_x71y472_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-05T00:10:05+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-wave2-260905",
  "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": [
   "x71y472"
  ],
  "route_summit_trim_m": 261.3,
  "route_summit_trim_loss_m": 13.9,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_MA_ME_MA_QL2_UTM18_L1_2015_LAS_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.996,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Wendell",
  "county": "Massachusetts"
 }
}