{
 "ocl_version": "0.1.0",
 "name": "Sheather Road",
 "slug": "sheather-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 27.476064374189946,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2948.0,
   "end_distance_m": 2950.0,
   "start_elevation_m": 186.18034300586024,
   "end_elevation_m": 186.72986429334404,
   "min_gradient_pct": -10.919161504129704
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.052450745211825,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2947.0,
   "end_distance_m": 2950.0,
   "start_elevation_m": 185.91829077098768,
   "end_elevation_m": 186.72986429334404,
   "min_gradient_pct": -10.625280529175049
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.78152375653815,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2945.0,
   "end_distance_m": 2950.0,
   "start_elevation_m": 185.44078810551713,
   "end_elevation_m": 186.72986429334404,
   "min_gradient_pct": -9.552330557434061
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.888193484035867,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2945.0,
   "end_distance_m": 2955.0,
   "start_elevation_m": 185.44078810551713,
   "end_elevation_m": 187.82960745392072,
   "min_gradient_pct": -8.314327261352048
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.783279179889036,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2941.0,
   "end_distance_m": 2961.0,
   "start_elevation_m": 184.62364970076422,
   "end_elevation_m": 189.18030553674203,
   "min_gradient_pct": -7.459682222386448
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.833591157275464,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2937.0,
   "end_distance_m": 2962.0,
   "start_elevation_m": 183.8996006650415,
   "end_elevation_m": 189.35799845436037,
   "min_gradient_pct": -6.995888397264139
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.63324107358949,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2913.0,
   "end_distance_m": 2963.0,
   "start_elevation_m": 179.72050728592842,
   "end_elevation_m": 189.53712782272316,
   "min_gradient_pct": -6.305214634457684
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 16.90263574346264,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 2865.0,
   "end_distance_m": 2965.0,
   "start_elevation_m": 172.92540980305154,
   "end_elevation_m": 189.82804554651418,
   "min_gradient_pct": -6.255525706454762
  }
 ],
 "shape": {
  "ascent_concentration": 0.474,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 128.0,
  "shape_class": "stepped"
 },
 "length_m": 2992.0000000001655,
 "start_elevation_m": 115.5419565676882,
 "end_elevation_m": 191.7493835680998,
 "endpoint_gain_m": 76.2074270004116,
 "overall_gradient_pct": 2.5470396724735087,
 "accumulated_ascent_m": 98.37963083247924,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.78152375653815,
   "start_distance_m": 2945.0,
   "end_distance_m": 2950.0,
   "midpoint_distance_m": 2947.5,
   "start_elevation_m": 185.44078810551713,
   "end_elevation_m": 186.72986429334404,
   "start_xy": [
    607413.7902454062,
    4556976.587018074
   ],
   "end_xy": [
    607409.1940695114,
    4556978.409252183
   ]
  },
  "max_10m": {
   "gradient_pct": 23.888193484035867,
   "start_distance_m": 2945.0,
   "end_distance_m": 2955.0,
   "midpoint_distance_m": 2950.0,
   "start_elevation_m": 185.44078810551713,
   "end_elevation_m": 187.82960745392072,
   "start_xy": [
    607413.7902454062,
    4556976.587018074
   ],
   "end_xy": [
    607404.321414442,
    4556978.438403031
   ]
  },
  "max_20m": {
   "gradient_pct": 22.783279179889036,
   "start_distance_m": 2941.0,
   "end_distance_m": 2961.0,
   "midpoint_distance_m": 2951.0,
   "start_elevation_m": 184.62364970076422,
   "end_elevation_m": 189.18030553674203,
   "start_xy": [
    607416.5713441864,
    4556973.844650313
   ],
   "end_xy": [
    607398.6701975884,
    4556976.422529076
   ]
  },
  "max_25m": {
   "gradient_pct": 21.833591157275464,
   "start_distance_m": 2937.0,
   "end_distance_m": 2962.0,
   "midpoint_distance_m": 2949.5,
   "start_elevation_m": 183.8996006650415,
   "end_elevation_m": 189.35799845436037,
   "start_xy": [
    607418.7474520667,
    4556970.519551254
   ],
   "end_xy": [
    607397.7283200246,
    4556976.086572748
   ]
  },
  "max_50m": {
   "gradient_pct": 19.63324107358949,
   "start_distance_m": 2913.0,
   "end_distance_m": 2963.0,
   "midpoint_distance_m": 2938.0,
   "start_elevation_m": 179.72050728592842,
   "end_elevation_m": 189.53712782272316,
   "start_xy": [
    607421.235905204,
    4556946.655062594
   ],
   "end_xy": [
    607396.7864424607,
    4556975.750616419
   ]
  },
  "max_100m": {
   "gradient_pct": 16.90263574346264,
   "start_distance_m": 2865.0,
   "end_distance_m": 2965.0,
   "midpoint_distance_m": 2915.0,
   "start_elevation_m": 172.92540980305154,
   "end_elevation_m": 189.82804554651418,
   "start_xy": [
    607426.6591859409,
    4556898.98034999
   ],
   "end_xy": [
    607394.9028002528,
    4556975.078387352
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.552330557434061,
   "start_distance_m": 4.0,
   "end_distance_m": 9.0,
   "midpoint_distance_m": 6.5,
   "start_elevation_m": 115.48367524969544,
   "end_elevation_m": 115.00605872182373,
   "start_xy": [
    606488.526008877,
    4559145.509990197
   ],
   "end_xy": [
    606491.882747433,
    4559141.804278499
   ]
  },
  "min_10m": {
   "gradient_pct": -8.314327261352048,
   "start_distance_m": 4.0,
   "end_distance_m": 14.0,
   "midpoint_distance_m": 9.0,
   "start_elevation_m": 115.48367524969544,
   "end_elevation_m": 114.65224252356023,
   "start_xy": [
    606488.526008877,
    4559145.509990197
   ],
   "end_xy": [
    606495.2399840889,
    4559138.099017546
   ]
  },
  "min_20m": {
   "gradient_pct": -7.459682222386448,
   "start_distance_m": 4.0,
   "end_distance_m": 24.0,
   "midpoint_distance_m": 14.0,
   "start_elevation_m": 115.48367524969544,
   "end_elevation_m": 113.99173880521815,
   "start_xy": [
    606488.526008877,
    4559145.509990197
   ],
   "end_xy": [
    606502.7898123089,
    4559131.591374358
   ]
  },
  "min_25m": {
   "gradient_pct": -6.995888397264139,
   "start_distance_m": 4.0,
   "end_distance_m": 29.0,
   "midpoint_distance_m": 16.5,
   "start_elevation_m": 115.48367524969544,
   "end_elevation_m": 113.7347031503794,
   "start_xy": [
    606488.526008877,
    4559145.509990197
   ],
   "end_xy": [
    606506.7504774099,
    4559128.539632298
   ]
  },
  "min_50m": {
   "gradient_pct": -6.305214634457684,
   "start_distance_m": 2702.0,
   "end_distance_m": 2752.0,
   "midpoint_distance_m": 2727.0,
   "start_elevation_m": 174.04377557296584,
   "end_elevation_m": 170.891168255737,
   "start_xy": [
    607454.4298014408,
    4556966.719879928
   ],
   "end_xy": [
    607455.0218073427,
    4556916.723388117
   ]
  },
  "min_100m": {
   "gradient_pct": -6.255525706454762,
   "start_distance_m": 2711.0,
   "end_distance_m": 2811.0,
   "midpoint_distance_m": 2761.0,
   "start_elevation_m": 173.4986307094919,
   "end_elevation_m": 167.24310500303713,
   "start_xy": [
    607454.536805802,
    4556957.720516504
   ],
   "end_xy": [
    607455.6471214338,
    4556857.745798906
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 27.476064374189946,
   "start_distance_m": 2948.0,
   "end_distance_m": 2950.0,
   "midpoint_distance_m": 2949.0,
   "start_elevation_m": 186.18034300586024,
   "end_elevation_m": 186.72986429334404,
   "start_xy": [
    607411.1332880295,
    4556977.978742944
   ],
   "end_xy": [
    607409.1940695114,
    4556978.409252183
   ]
  },
  "max_3m": {
   "gradient_pct": 27.052450745211825,
   "start_distance_m": 2947.0,
   "end_distance_m": 2950.0,
   "midpoint_distance_m": 2948.5,
   "start_elevation_m": 185.91829077098768,
   "end_elevation_m": 186.72986429334404,
   "start_xy": [
    607412.027791495,
    4556977.532404099
   ],
   "end_xy": [
    607409.1940695114,
    4556978.409252183
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.403,
   "obstruction_max_height_m": 33.15,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "descends_at_start",
   "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/ny/USGS_1M_18_x60y456_NY_FEMAR2_Central_2018_D19.tif"
  ],
  "calculated_at": "2026-09-15T02:37:17+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-york-2026-09-06.osm.pbf",
  "osm_snapshot": "2026-09-04T20:21:21Z",
  "run_id": "retro-260914",
  "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, NY_FEMAR2_Central_2018_D19 (collected 2018)",
  "elevation_tile_ids": [
   "x60y456"
  ],
  "route_cut_m": 2992.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NY_FEMAR2_Central_B1_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "structure_own_ways": "none \u2014 the route carried no way list; own decks unmasked",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "New Castle",
  "county": "New York"
 }
}