{
 "ocl_version": "0.1.0",
 "name": "Switchback Road",
 "slug": "switchback-road-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 18.317877030651175,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 903.0,
   "end_distance_m": 905.0,
   "start_elevation_m": 509.5528515139598,
   "end_elevation_m": 509.91920905457283,
   "min_gradient_pct": 2.069411678303368
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 18.09590636328835,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 902.0,
   "end_distance_m": 905.0,
   "start_elevation_m": 509.3763318636742,
   "end_elevation_m": 509.91920905457283,
   "min_gradient_pct": 2.5486719466584873
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 17.803639750292177,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 901.0,
   "end_distance_m": 906.0,
   "start_elevation_m": 509.20076559191176,
   "end_elevation_m": 510.09094757942637,
   "min_gradient_pct": 2.8051107194937686
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 17.438836708945473,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 896.0,
   "end_distance_m": 906.0,
   "start_elevation_m": 508.3470639085318,
   "end_elevation_m": 510.09094757942637,
   "min_gradient_pct": 3.5743433599611762
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 16.7659311415008,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 893.0,
   "end_distance_m": 913.0,
   "start_elevation_m": 507.8608266639981,
   "end_elevation_m": 511.2140128922983,
   "min_gradient_pct": 5.095197820691624
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 16.53543455435056,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 890.0,
   "end_distance_m": 915.0,
   "start_elevation_m": 507.3943130502609,
   "end_elevation_m": 511.52817168884854,
   "min_gradient_pct": 5.649474831432599
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.393139293275908,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 860.0,
   "end_distance_m": 910.0,
   "start_elevation_m": 502.54395398333804,
   "end_elevation_m": 510.740523629976,
   "min_gradient_pct": 7.316367848579489
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.570224798338018,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 851.0,
   "end_distance_m": 951.0,
   "start_elevation_m": 501.2549219315756,
   "end_elevation_m": 516.8251467299136,
   "min_gradient_pct": 7.770146124387452
  }
 ],
 "shape": {
  "ascent_concentration": 0.3,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 507.0,
  "shape_class": "sustained"
 },
 "length_m": 1097.606416965447,
 "start_elevation_m": 406.56927932948184,
 "end_elevation_m": 532.7271906304986,
 "endpoint_gain_m": 126.15791130101678,
 "overall_gradient_pct": 11.49391160173841,
 "accumulated_ascent_m": 126.15791130101678,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 17.803639750292177,
   "start_distance_m": 901.0,
   "end_distance_m": 906.0,
   "midpoint_distance_m": 903.5,
   "start_elevation_m": 509.20076559191176,
   "end_elevation_m": 510.09094757942637,
   "start_xy": [
    339627.97759694466,
    4646572.2808052255
   ],
   "end_xy": [
    339624.9063509571,
    4646576.226365779
   ]
  },
  "max_10m": {
   "gradient_pct": 17.438836708945473,
   "start_distance_m": 896.0,
   "end_distance_m": 906.0,
   "midpoint_distance_m": 901.0,
   "start_elevation_m": 508.3470639085318,
   "end_elevation_m": 510.09094757942637,
   "start_xy": [
    339631.0488429322,
    4646568.335244671
   ],
   "end_xy": [
    339624.9063509571,
    4646576.226365779
   ]
  },
  "max_20m": {
   "gradient_pct": 16.7659311415008,
   "start_distance_m": 893.0,
   "end_distance_m": 913.0,
   "midpoint_distance_m": 903.0,
   "start_elevation_m": 507.8608266639981,
   "end_elevation_m": 511.2140128922983,
   "start_xy": [
    339632.89159052476,
    4646565.967908339
   ],
   "end_xy": [
    339620.60660657455,
    4646581.750150554
   ]
  },
  "max_25m": {
   "gradient_pct": 16.53543455435056,
   "start_distance_m": 890.0,
   "end_distance_m": 915.0,
   "midpoint_distance_m": 902.5,
   "start_elevation_m": 507.3943130502609,
   "end_elevation_m": 511.52817168884854,
   "start_xy": [
    339634.7343381173,
    4646563.600572007
   ],
   "end_xy": [
    339619.3781081795,
    4646583.328374776
   ]
  },
  "max_50m": {
   "gradient_pct": 16.393139293275908,
   "start_distance_m": 860.0,
   "end_distance_m": 910.0,
   "midpoint_distance_m": 885.0,
   "start_elevation_m": 502.54395398333804,
   "end_elevation_m": 510.740523629976,
   "start_xy": [
    339654.0288985356,
    4646540.634668123
   ],
   "end_xy": [
    339622.4493541671,
    4646579.382814222
   ]
  },
  "max_100m": {
   "gradient_pct": 15.570224798338018,
   "start_distance_m": 851.0,
   "end_distance_m": 951.0,
   "midpoint_distance_m": 901.0,
   "start_elevation_m": 501.2549219315756,
   "end_elevation_m": 516.8251467299136,
   "start_xy": [
    339659.8769210485,
    4646533.793569331
   ],
   "end_xy": [
    339596.68491664715,
    4646611.266377889
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.8051107194937686,
   "start_distance_m": 1092.0,
   "end_distance_m": 1097.0,
   "midpoint_distance_m": 1094.5,
   "start_elevation_m": 532.5833565072321,
   "end_elevation_m": 532.7236120432068,
   "start_xy": [
    339506.6440800501,
    4646719.730436278
   ],
   "end_xy": [
    339503.30373010854,
    4646723.450928485
   ]
  },
  "min_10m": {
   "gradient_pct": 3.5743433599611762,
   "start_distance_m": 1087.0,
   "end_distance_m": 1097.0,
   "midpoint_distance_m": 1092.0,
   "start_elevation_m": 532.3661777072107,
   "end_elevation_m": 532.7236120432068,
   "start_xy": [
    339509.98442999175,
    4646716.009944069
   ],
   "end_xy": [
    339503.30373010854,
    4646723.450928485
   ]
  },
  "min_20m": {
   "gradient_pct": 5.095197820691624,
   "start_distance_m": 1077.0,
   "end_distance_m": 1097.0,
   "midpoint_distance_m": 1087.0,
   "start_elevation_m": 531.7045724790685,
   "end_elevation_m": 532.7236120432068,
   "start_xy": [
    339516.665129875,
    4646708.568959654
   ],
   "end_xy": [
    339503.30373010854,
    4646723.450928485
   ]
  },
  "min_25m": {
   "gradient_pct": 5.649474831432599,
   "start_distance_m": 1072.0,
   "end_distance_m": 1097.0,
   "midpoint_distance_m": 1084.5,
   "start_elevation_m": 531.3112433353486,
   "end_elevation_m": 532.7236120432068,
   "start_xy": [
    339520.00547981664,
    4646704.848467447
   ],
   "end_xy": [
    339503.30373010854,
    4646723.450928485
   ]
  },
  "min_50m": {
   "gradient_pct": 7.316367848579489,
   "start_distance_m": 343.0,
   "end_distance_m": 393.0,
   "midpoint_distance_m": 368.0,
   "start_elevation_m": 441.2421883883603,
   "end_elevation_m": 444.90037231265006,
   "start_xy": [
    339981.9530728795,
    4646172.585548332
   ],
   "end_xy": [
    339934.85726409254,
    4646187.299390298
   ]
  },
  "min_100m": {
   "gradient_pct": 7.770146124387452,
   "start_distance_m": 334.0,
   "end_distance_m": 434.0,
   "midpoint_distance_m": 384.0,
   "start_elevation_m": 440.5792510534926,
   "end_elevation_m": 448.34939717788006,
   "start_xy": [
    339989.40740456205,
    4646167.542440247
   ],
   "end_xy": [
    339894.6111195393,
    4646192.659309996
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 18.317877030651175,
   "start_distance_m": 903.0,
   "end_distance_m": 905.0,
   "midpoint_distance_m": 904.0,
   "start_elevation_m": 509.5528515139598,
   "end_elevation_m": 509.91920905457283,
   "start_xy": [
    339626.74909854966,
    4646573.859029447
   ],
   "end_xy": [
    339625.52060015465,
    4646575.437253668
   ]
  },
  "max_3m": {
   "gradient_pct": 18.09590636328835,
   "start_distance_m": 902.0,
   "end_distance_m": 905.0,
   "midpoint_distance_m": 903.5,
   "start_elevation_m": 509.3763318636742,
   "end_elevation_m": 509.91920905457283,
   "start_xy": [
    339627.3633477472,
    4646573.069917336
   ],
   "end_xy": [
    339625.52060015465,
    4646575.437253668
   ]
  }
 },
 "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/pa/USGS_1M_18_x33y465_PA_Northcentral_2019_B19.tif",
   "data/cache/usa/pa/USGS_1M_18_x34y465_PA_Northcentral_2019_B19.tif"
  ],
  "calculated_at": "2026-09-15T06:52:10+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/pennsylvania-2026-09-07.osm.pbf",
  "osm_snapshot": "2026-09-06T20:21:35Z",
  "run_id": "reline-campaign-260915",
  "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, PA_Northcentral_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
   "x33y465",
   "x34y465"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: PA_Northcentral_2019_B19: HTTP Error 404: Not Found",
  "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": "Jackson",
  "county": "Pennsylvania"
 }
}