{
 "ocl_version": "0.1.0",
 "name": "Clark Wright Road",
 "slug": "clark-wright-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 30.263093316423806,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 260.0,
   "end_distance_m": 262.0,
   "start_elevation_m": 374.0479221122017,
   "end_elevation_m": 374.6531839785302,
   "min_gradient_pct": -18.491659000585514,
   "suppressed_max_gradient_pct": 67.29546356079936,
   "suppressed_location_m": [
    3.0,
    5.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.574806394948308,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 259.0,
   "end_distance_m": 262.0,
   "start_elevation_m": 373.85593978668174,
   "end_elevation_m": 374.6531839785302,
   "min_gradient_pct": -13.132148851519787,
   "suppressed_max_gradient_pct": 60.35046597743682,
   "suppressed_location_m": [
    3.0,
    6.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.697935411730896,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 122.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 349.4181590757045,
   "end_elevation_m": 350.65305584629107,
   "min_gradient_pct": -8.708430868016421,
   "suppressed_max_gradient_pct": 45.98361574826981,
   "suppressed_location_m": [
    2.0,
    7.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 24.26918236588108,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 117.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 348.22613760970296,
   "end_elevation_m": 350.65305584629107,
   "min_gradient_pct": -7.656071535493538,
   "suppressed_max_gradient_pct": 25.04906579864155,
   "suppressed_location_m": [
    1.0,
    11.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.441432457599376,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 110.0,
   "end_distance_m": 130.0,
   "start_elevation_m": 346.6423272793112,
   "end_elevation_m": 351.33061377083106,
   "min_gradient_pct": -7.113417259173218
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.042693593288732,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 107.0,
   "end_distance_m": 132.0,
   "start_elevation_m": 346.007758911128,
   "end_elevation_m": 351.7684323094502,
   "min_gradient_pct": -6.924189673331966
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.302319764518415,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 152.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 355.3868929812151,
   "end_elevation_m": 366.0380528634743,
   "min_gradient_pct": -6.166733134133324
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.010306108187653,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 102.0,
   "end_distance_m": 202.0,
   "start_elevation_m": 345.02774675528667,
   "end_elevation_m": 366.0380528634743,
   "min_gradient_pct": -4.011892681086977
  }
 ],
 "shape": {
  "ascent_concentration": 0.451,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 143.0,
  "shape_class": "stepped"
 },
 "length_m": 3277.8219606999482,
 "start_elevation_m": 337.4886595828998,
 "end_elevation_m": 500.9507056358662,
 "endpoint_gain_m": 163.4620460529664,
 "overall_gradient_pct": 4.9869104549552965,
 "accumulated_ascent_m": 175.0227814491463,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.697935411730896,
   "start_distance_m": 122.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 124.5,
   "start_elevation_m": 349.4181590757045,
   "end_elevation_m": 350.65305584629107,
   "start_xy": [
    666358.621637313,
    4689575.83815739
   ],
   "end_xy": [
    666354.8457885827,
    4689572.560510922
   ]
  },
  "max_10m": {
   "gradient_pct": 24.26918236588108,
   "start_distance_m": 117.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 122.0,
   "start_elevation_m": 348.22613760970296,
   "end_elevation_m": 350.65305584629107,
   "start_xy": [
    666362.3974860435,
    4689579.115803857
   ],
   "end_xy": [
    666354.8457885827,
    4689572.560510922
   ]
  },
  "max_20m": {
   "gradient_pct": 23.441432457599376,
   "start_distance_m": 110.0,
   "end_distance_m": 130.0,
   "midpoint_distance_m": 120.0,
   "start_elevation_m": 346.6423272793112,
   "end_elevation_m": 351.33061377083106,
   "start_xy": [
    666366.6481685047,
    4689584.458561627
   ],
   "end_xy": [
    666352.5802793445,
    4689570.593923042
   ]
  },
  "max_25m": {
   "gradient_pct": 23.042693593288732,
   "start_distance_m": 107.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 119.5,
   "start_elevation_m": 346.007758911128,
   "end_elevation_m": 351.7684323094502,
   "start_xy": [
    666367.8244007312,
    4689587.218358313
   ],
   "end_xy": [
    666351.0699398522,
    4689569.282864455
   ]
  },
  "max_50m": {
   "gradient_pct": 21.302319764518415,
   "start_distance_m": 152.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 177.0,
   "start_elevation_m": 355.3868929812151,
   "end_elevation_m": 366.0380528634743,
   "start_xy": [
    666331.8181132163,
    4689564.3158617485
   ],
   "end_xy": [
    666314.016024548,
    4689525.085235142
   ]
  },
  "max_100m": {
   "gradient_pct": 21.010306108187653,
   "start_distance_m": 102.0,
   "end_distance_m": 202.0,
   "midpoint_distance_m": 152.0,
   "start_elevation_m": 345.02774675528667,
   "end_elevation_m": 366.0380528634743,
   "start_xy": [
    666369.7847877755,
    4689591.818019456
   ],
   "end_xy": [
    666314.016024548,
    4689525.085235142
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.708430868016421,
   "start_distance_m": 1483.0,
   "end_distance_m": 1488.0,
   "midpoint_distance_m": 1485.5,
   "start_elevation_m": 433.5650482654737,
   "end_elevation_m": 433.1296267220729,
   "start_xy": [
    665506.554935843,
    4688682.48201197
   ],
   "end_xy": [
    665501.8463910066,
    4688680.802973741
   ]
  },
  "min_10m": {
   "gradient_pct": -7.656071535493538,
   "start_distance_m": 964.0,
   "end_distance_m": 974.0,
   "midpoint_distance_m": 969.0,
   "start_elevation_m": 419.5914587007776,
   "end_elevation_m": 418.82585154722824,
   "start_xy": [
    665969.0206332038,
    4688903.75429809
   ],
   "end_xy": [
    665961.6814869858,
    4688896.961880789
   ]
  },
  "min_20m": {
   "gradient_pct": -7.113417259173218,
   "start_distance_m": 958.0,
   "end_distance_m": 978.0,
   "midpoint_distance_m": 968.0,
   "start_elevation_m": 419.9663286536241,
   "end_elevation_m": 418.54364520178945,
   "start_xy": [
    665973.2006419627,
    4688908.0544682145
   ],
   "end_xy": [
    665958.7458284986,
    4688894.244913869
   ]
  },
  "min_25m": {
   "gradient_pct": -6.924189673331966,
   "start_distance_m": 960.0,
   "end_distance_m": 985.0,
   "midpoint_distance_m": 972.5,
   "start_elevation_m": 419.84142132699685,
   "end_elevation_m": 418.11037390866386,
   "start_xy": [
    665971.8340524497,
    4688906.594182933
   ],
   "end_xy": [
    665953.608426146,
    4688889.490221757
   ]
  },
  "min_50m": {
   "gradient_pct": -6.166733134133324,
   "start_distance_m": 957.0,
   "end_distance_m": 1007.0,
   "midpoint_distance_m": 982.0,
   "start_elevation_m": 420.013433028605,
   "end_elevation_m": 416.93006646153833,
   "start_xy": [
    665973.8839367193,
    4688908.784610854
   ],
   "end_xy": [
    665937.4427235642,
    4688874.568105226
   ]
  },
  "min_100m": {
   "gradient_pct": -4.011892681086977,
   "start_distance_m": 949.0,
   "end_distance_m": 1049.0,
   "midpoint_distance_m": 999.0,
   "start_elevation_m": 420.1613387195793,
   "end_elevation_m": 416.14944603849233,
   "start_xy": [
    665979.3502947716,
    4688914.62575198
   ],
   "end_xy": [
    665903.5365512619,
    4688849.923990331
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 30.263093316423806,
   "start_distance_m": 260.0,
   "end_distance_m": 262.0,
   "midpoint_distance_m": 261.0,
   "start_elevation_m": 374.0479221122017,
   "end_elevation_m": 374.6531839785302,
   "start_xy": [
    666320.3157529766,
    4689467.604063908
   ],
   "end_xy": [
    666320.8256878617,
    4689465.670164631
   ]
  },
  "max_3m": {
   "gradient_pct": 26.574806394948308,
   "start_distance_m": 259.0,
   "end_distance_m": 262.0,
   "midpoint_distance_m": 260.5,
   "start_elevation_m": 373.85593978668174,
   "end_elevation_m": 374.6531839785302,
   "start_xy": [
    666320.0607855341,
    4689468.571013546
   ],
   "end_xy": [
    666320.8256878617,
    4689465.670164631
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.002,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.408,
   "obstruction_max_height_m": 27.19,
   "flagged_windows_m": [
    2,
    3,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    1.0,
    7.0
   ]
  ],
  "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_x66y469_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:42:33+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": [
   "x66y469"
  ],
  "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_L2_2015_LAS_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.999,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Middlefield",
  "county": "Massachusetts"
 }
}