{
 "ocl_version": "0.1.0",
 "name": "Gulf Road",
 "slug": "gulf-road-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 32.166018504617,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "texture_excluded_min"
   ],
   "start_distance_m": 149.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 234.4256269575519,
   "end_elevation_m": 235.06894732764425,
   "min_gradient_pct": -10.897699853209986,
   "suppressed_max_gradient_pct": 33.381138576781666,
   "suppressed_location_m": [
    211.0,
    213.0
   ],
   "suppressed_min_gradient_pct": -24.373444798369803,
   "suppressed_min_location_m": [
    208.0,
    210.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 29.17250427161188,
   "diagnostic": true,
   "flags": [
    "texture_excluded",
    "texture_excluded_min"
   ],
   "start_distance_m": 148.0,
   "end_distance_m": 151.0,
   "start_elevation_m": 234.1937721994959,
   "end_elevation_m": 235.06894732764425,
   "min_gradient_pct": -9.763431448132565,
   "suppressed_max_gradient_pct": 30.361897951280525,
   "suppressed_location_m": [
    211.0,
    214.0
   ],
   "suppressed_min_gradient_pct": -20.41559776590418,
   "suppressed_min_location_m": [
    207.0,
    210.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.696139744089805,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded_min",
    "canopy_or_structure"
   ],
   "start_distance_m": 147.0,
   "end_distance_m": 152.0,
   "start_elevation_m": 234.01427755523832,
   "end_elevation_m": 235.2990845424428,
   "min_gradient_pct": -6.992417080381301,
   "suppressed_max_gradient_pct": 29.08550918985611,
   "suppressed_location_m": [
    226.0,
    231.0
   ],
   "suppressed_min_gradient_pct": -12.981198220744545,
   "suppressed_min_location_m": [
    205.0,
    210.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.59378210862826,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded_min",
    "canopy_or_structure"
   ],
   "start_distance_m": 402.0,
   "end_distance_m": 412.0,
   "start_elevation_m": 269.32068437956957,
   "end_elevation_m": 271.4800625904324,
   "min_gradient_pct": -5.810718509682147,
   "suppressed_max_gradient_pct": 27.837871788490816,
   "suppressed_location_m": [
    225.0,
    235.0
   ],
   "suppressed_min_gradient_pct": -9.986807650562923,
   "suppressed_min_location_m": [
    200.0,
    210.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.19835698290302,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded_min",
    "canopy_or_structure"
   ],
   "start_distance_m": 391.0,
   "end_distance_m": 411.0,
   "start_elevation_m": 267.04578261101216,
   "end_elevation_m": 271.28545400759276,
   "min_gradient_pct": -2.074553730563622,
   "suppressed_max_gradient_pct": 24.692956770381755,
   "suppressed_location_m": [
    211.0,
    231.0
   ],
   "suppressed_min_gradient_pct": -6.5598681004510695,
   "suppressed_min_location_m": [
    190.0,
    210.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.83327560571456,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "texture_excluded_min",
    "canopy_or_structure"
   ],
   "start_distance_m": 386.0,
   "end_distance_m": 411.0,
   "start_elevation_m": 266.0771351061641,
   "end_elevation_m": 271.28545400759276,
   "min_gradient_pct": 0.32182042748763706,
   "suppressed_max_gradient_pct": 24.95457391885941,
   "suppressed_location_m": [
    210.0,
    235.0
   ],
   "suppressed_min_gradient_pct": -3.591020066118972,
   "suppressed_min_location_m": [
    185.0,
    210.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.90007186653861,
   "diagnostic": false,
   "flags": [
    "texture_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 375.0,
   "end_distance_m": 425.0,
   "start_elevation_m": 264.16109496479635,
   "end_elevation_m": 273.61113089806565,
   "min_gradient_pct": 0.9832373398235177,
   "suppressed_max_gradient_pct": 20.908226190938823,
   "suppressed_location_m": [
    210.0,
    260.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.259113708264465,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 316.0,
   "end_distance_m": 416.0,
   "start_elevation_m": 254.86954797838547,
   "end_elevation_m": 272.12866168664993,
   "min_gradient_pct": 2.813781011729418
  }
 ],
 "shape": {
  "ascent_concentration": 0.473,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 147.0,
  "shape_class": "stepped"
 },
 "length_m": 1160.623871673609,
 "start_elevation_m": 225.82920061762437,
 "end_elevation_m": 316.9161617401108,
 "endpoint_gain_m": 91.08696112248643,
 "overall_gradient_pct": 7.848103364541336,
 "accumulated_ascent_m": 93.14999930805553,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.696139744089805,
   "start_distance_m": 147.0,
   "end_distance_m": 152.0,
   "midpoint_distance_m": 149.5,
   "start_elevation_m": 234.01427755523832,
   "end_elevation_m": 235.2990845424428,
   "start_xy": [
    729914.834723459,
    4723139.834060724
   ],
   "end_xy": [
    729910.5961864514,
    4723137.181741533
   ]
  },
  "max_10m": {
   "gradient_pct": 21.59378210862826,
   "start_distance_m": 402.0,
   "end_distance_m": 412.0,
   "midpoint_distance_m": 407.0,
   "start_elevation_m": 269.32068437956957,
   "end_elevation_m": 271.4800625904324,
   "start_xy": [
    729703.0458079418,
    4723025.767306597
   ],
   "end_xy": [
    729693.114426494,
    4723024.603101269
   ]
  },
  "max_20m": {
   "gradient_pct": 21.19835698290302,
   "start_distance_m": 391.0,
   "end_distance_m": 411.0,
   "midpoint_distance_m": 401.0,
   "start_elevation_m": 267.04578261101216,
   "end_elevation_m": 271.28545400759276,
   "start_xy": [
    729713.994900175,
    4723026.824363872
   ],
   "end_xy": [
    729694.1068270084,
    4723024.726150929
   ]
  },
  "max_25m": {
   "gradient_pct": 20.83327560571456,
   "start_distance_m": 386.0,
   "end_distance_m": 411.0,
   "midpoint_distance_m": 398.5,
   "start_elevation_m": 266.0771351061641,
   "end_elevation_m": 271.28545400759276,
   "start_xy": [
    729718.971807699,
    4723027.304354959
   ],
   "end_xy": [
    729694.1068270084,
    4723024.726150929
   ]
  },
  "max_50m": {
   "gradient_pct": 18.90007186653861,
   "start_distance_m": 375.0,
   "end_distance_m": 425.0,
   "midpoint_distance_m": 400.0,
   "start_elevation_m": 264.16109496479635,
   "end_elevation_m": 273.61113089806565,
   "start_xy": [
    729729.9087843146,
    4723028.478769663
   ],
   "end_xy": [
    729680.2137627498,
    4723022.999095344
   ]
  },
  "max_100m": {
   "gradient_pct": 17.259113708264465,
   "start_distance_m": 316.0,
   "end_distance_m": 416.0,
   "midpoint_distance_m": 366.0,
   "start_elevation_m": 254.86954797838547,
   "end_elevation_m": 272.12866168664993,
   "start_xy": [
    729788.1078348373,
    4723038.015576583
   ],
   "end_xy": [
    729689.145053657,
    4723024.109061027
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.992417080381301,
   "start_distance_m": 200.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 202.5,
   "start_elevation_m": 238.3763656453609,
   "end_elevation_m": 238.02674479134183,
   "start_xy": [
    729873.4818639962,
    4723106.829437053
   ],
   "end_xy": [
    729869.6631654446,
    4723103.603141433
   ]
  },
  "min_10m": {
   "gradient_pct": -5.810718509682147,
   "start_distance_m": 193.0,
   "end_distance_m": 203.0,
   "midpoint_distance_m": 198.0,
   "start_elevation_m": 238.66453455288513,
   "end_elevation_m": 238.08346270191691,
   "start_xy": [
    729878.8710914708,
    4723111.29667579
   ],
   "end_xy": [
    729871.172723579,
    4723104.914269649
   ]
  },
  "min_20m": {
   "gradient_pct": -2.074553730563622,
   "start_distance_m": 187.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 197.0,
   "start_elevation_m": 238.40506355939445,
   "end_elevation_m": 237.99015281328172,
   "start_xy": [
    729883.4898549258,
    4723115.126429516
   ],
   "end_xy": [
    729868.3233037369,
    4723102.118294586
   ]
  },
  "min_25m": {
   "gradient_pct": 0.32182042748763706,
   "start_distance_m": 182.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 194.5,
   "start_elevation_m": 237.90969770640982,
   "end_elevation_m": 237.99015281328172,
   "start_xy": [
    729887.3390503621,
    4723118.317619156
   ],
   "end_xy": [
    729868.3233037369,
    4723102.118294586
   ]
  },
  "min_50m": {
   "gradient_pct": 0.9832373398235177,
   "start_distance_m": 23.0,
   "end_distance_m": 73.0,
   "midpoint_distance_m": 48.0,
   "start_elevation_m": 227.79541586550812,
   "end_elevation_m": 228.28703453541988,
   "start_xy": [
    730029.8806685805,
    4723137.74830998
   ],
   "end_xy": [
    729982.0468565972,
    4723151.7069159895
   ]
  },
  "min_100m": {
   "gradient_pct": 2.813781011729418,
   "start_distance_m": 22.0,
   "end_distance_m": 122.0,
   "midpoint_distance_m": 72.0,
   "start_elevation_m": 227.7351729409267,
   "end_elevation_m": 230.54895395265612,
   "start_xy": [
    730030.865046885,
    4723137.572243647
   ],
   "end_xy": [
    729936.1279105087,
    4723152.931237696
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 32.166018504617,
   "start_distance_m": 149.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 150.0,
   "start_elevation_m": 234.4256269575519,
   "end_elevation_m": 235.06894732764425,
   "start_xy": [
    729913.1394502213,
    4723138.772906388
   ],
   "end_xy": [
    729911.4434730588,
    4723137.712877443
   ]
  },
  "max_3m": {
   "gradient_pct": 29.17250427161188,
   "start_distance_m": 148.0,
   "end_distance_m": 151.0,
   "midpoint_distance_m": 149.5,
   "start_elevation_m": 234.1937721994959,
   "end_elevation_m": 235.06894732764425,
   "start_xy": [
    729913.9870109746,
    4723139.303604749
   ],
   "end_xy": [
    729911.4434730588,
    4723137.712877443
   ]
  }
 },
 "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": {
  "texture_suppression": {
   "masked_fraction": 0.026,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0
   ],
   "windows_unresolved": [],
   "minima_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0
   ],
   "minima_unresolved": []
  },
  "texture_windows": {
   "rounds": 1,
   "windows_masked": [
    {
     "window_m": 25.0,
     "start_m": 210.0,
     "end_m": 235.0,
     "raw_pct": 24.95,
     "reason": "hump"
    },
    {
     "window_m": 20.0,
     "start_m": 211.0,
     "end_m": 231.0,
     "raw_pct": 24.69,
     "reason": "hump"
    },
    {
     "window_m": 10.0,
     "start_m": 225.0,
     "end_m": 235.0,
     "raw_pct": 27.84,
     "reason": "hump"
    }
   ],
   "advisory": [],
   "unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.537,
   "obstruction_max_height_m": 31.04,
   "flagged_windows_m": [
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    208.0,
    237.0
   ]
  ],
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "8f4becd2ed8ab26772f5cd961ca7d1d0c2823252",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "remeasure-valley-260921-us",
   "road_pbf": "batch-usa-ma-chunk000.pbf",
   "region_key": "usa-ma",
   "crs": "EPSG:26918",
   "elevation_provider_key": "usa3dep",
   "authority": "usa-inventory",
   "registry_pbf": "massachusetts-260822.osm.pbf",
   "tile_index_snapshot": "sha256:9d39690570d45b99"
  },
  "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_x72y473_MA_Western_B24.tif",
   "data/cache/usa/ma/USGS_1M_18_x73y473_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-22T00:11:11+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "output/valley-260921/us/batch-usa-ma-chunk000.pbf",
  "osm_snapshot": "",
  "run_id": "remeasure-valley-260921-us",
  "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": [
   "x72y473",
   "x73y473"
  ],
  "route_base_cut_m": 557.0,
  "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_NE_CMGP_Sandy_Z18_2013",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.996,
   "cell_ground_m": 1.0,
   "nodes_failed": 0,
   "window_coverage": {
    "5": 1.0,
    "10": 1.0,
    "20": 1.0,
    "25": 1.0
   }
  },
  "structure_own_ways": 2,
  "structure_own_ways_source": "map-matched to the road network: the entry carried no way list, so the ways the route runs along were found by geometry (ukclimb.batch.own_ways_by_geometry)",
  "prior_doc": {
   "slug": "gulf-road-2",
   "calculated_at": "2026-09-12T00:44:09+00:00",
   "code_git_sha": null,
   "analysis_version": "0.1.0",
   "run_id": "texture-us-ma-260911",
   "path": "/root/uk-climbs/output/valley-260921/us/priors/gulf-road-2/gulf-road-2.json",
   "spans": 4,
   "sources": [
    "excluded_ranges_m",
    "texture"
   ]
  },
  "carriageway": {
   "stations": 53,
   "stations_resolved": 53,
   "width_median_m": 5.75,
   "width_p10_m": 2.55,
   "width_min_m": 2.0,
   "width_max_m": 12.0,
   "bounded_share": 0.113,
   "unbounded_share": 0.887,
   "confidence_median": 0.0,
   "width_median_bounded_m": 3.62,
   "window_m": [
    386.0,
    411.0
   ],
   "width_at_max25_m": 2.75,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "status": "unavailable \u2014 no DSM raster (surface model absent or point-cloud only, which cannot serve off-line samples)"
   }
  },
  "remeasured": {
   "on": "2026-09-22",
   "why": "valley-crossing extent re-measure 2026-09-22: low-to-summit (557.0 m -> 1718.0 m)",
   "published_max25_pct": 20.83,
   "max25_pct": 20.83
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Athol",
  "county": "Massachusetts"
 }
}