{
 "ocl_version": "0.1.0",
 "name": "Turtle Ridge Road",
 "slug": "turtle-ridge-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.7379966933039,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 348.0,
   "end_distance_m": 350.0,
   "start_elevation_m": 224.90353477380012,
   "end_elevation_m": 225.3982947076662,
   "min_gradient_pct": -10.142710335064464
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.293610774746337,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 347.0,
   "end_distance_m": 350.0,
   "start_elevation_m": 224.6694863844238,
   "end_elevation_m": 225.3982947076662,
   "min_gradient_pct": -10.117792321812166
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.835293919664764,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 345.0,
   "end_distance_m": 350.0,
   "start_elevation_m": 224.20653001168296,
   "end_elevation_m": 225.3982947076662,
   "min_gradient_pct": -9.891677485596233
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.285878813285876,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 344.0,
   "end_distance_m": 354.0,
   "start_elevation_m": 223.98348606122715,
   "end_elevation_m": 226.31207394255574,
   "min_gradient_pct": -9.325750581904515
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.696748071247157,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 341.0,
   "end_distance_m": 361.0,
   "start_elevation_m": 223.32481259472655,
   "end_elevation_m": 227.86416220897598,
   "min_gradient_pct": -8.89861658168428
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.3880664633665,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 340.0,
   "end_distance_m": 365.0,
   "start_elevation_m": 223.12850877176922,
   "end_elevation_m": 228.72552538761084,
   "min_gradient_pct": -8.609855552274212
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.51108093634582,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 331.0,
   "end_distance_m": 381.0,
   "start_elevation_m": 221.4796284317807,
   "end_elevation_m": 231.7351688999536,
   "min_gradient_pct": -7.352571227207989
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.340718411902486,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 302.0,
   "end_distance_m": 402.0,
   "start_elevation_m": 216.9701851684473,
   "end_elevation_m": 235.3109035803498,
   "min_gradient_pct": -1.549358821255339
  }
 ],
 "shape": {
  "ascent_concentration": 0.388,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 435.0,
  "shape_class": "sustained"
 },
 "length_m": 818.9999999997121,
 "start_elevation_m": 188.3357140360735,
 "end_elevation_m": 273.8257123010949,
 "endpoint_gain_m": 85.48999826502137,
 "overall_gradient_pct": 10.438339226502004,
 "accumulated_ascent_m": 89.4170745272425,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.835293919664764,
   "start_distance_m": 345.0,
   "end_distance_m": 350.0,
   "midpoint_distance_m": 347.5,
   "start_elevation_m": 224.20653001168296,
   "end_elevation_m": 225.3982947076662,
   "start_xy": [
    318117.10433289455,
    4466417.785373347
   ],
   "end_xy": [
    318122.08571034105,
    4466417.553214034
   ]
  },
  "max_10m": {
   "gradient_pct": 23.285878813285876,
   "start_distance_m": 344.0,
   "end_distance_m": 354.0,
   "midpoint_distance_m": 349.0,
   "start_elevation_m": 223.98348606122715,
   "end_elevation_m": 226.31207394255574,
   "start_xy": [
    318116.14405758877,
    4466418.064427709
   ],
   "end_xy": [
    318126.0019598603,
    4466418.034338399
   ]
  },
  "max_20m": {
   "gradient_pct": 22.696748071247157,
   "start_distance_m": 341.0,
   "end_distance_m": 361.0,
   "midpoint_distance_m": 351.0,
   "start_elevation_m": 223.32481259472655,
   "end_elevation_m": 227.86416220897598,
   "start_xy": [
    318113.26323167153,
    4466418.901590796
   ],
   "end_xy": [
    318132.45308586815,
    4466420.641992415
   ]
  },
  "max_25m": {
   "gradient_pct": 22.3880664633665,
   "start_distance_m": 340.0,
   "end_distance_m": 365.0,
   "midpoint_distance_m": 352.5,
   "start_elevation_m": 223.12850877176922,
   "end_elevation_m": 228.72552538761084,
   "start_xy": [
    318112.30295636575,
    4466419.1806451585
   ],
   "end_xy": [
    318135.8820254145,
    4466422.70169472
   ]
  },
  "max_50m": {
   "gradient_pct": 20.51108093634582,
   "start_distance_m": 331.0,
   "end_distance_m": 381.0,
   "midpoint_distance_m": 356.0,
   "start_elevation_m": 221.4796284317807,
   "end_elevation_m": 231.7351688999536,
   "start_xy": [
    318104.64574116416,
    4466423.793773315
   ],
   "end_xy": [
    318147.066739408,
    4466434.117332726
   ]
  },
  "max_100m": {
   "gradient_pct": 18.340718411902486,
   "start_distance_m": 302.0,
   "end_distance_m": 402.0,
   "midpoint_distance_m": 352.0,
   "start_elevation_m": 216.9701851684473,
   "end_elevation_m": 235.3109035803498,
   "start_xy": [
    318081.56013299414,
    4466417.828936908
   ],
   "end_xy": [
    318161.9939537538,
    4466448.868439279
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.891677485596233,
   "start_distance_m": 11.0,
   "end_distance_m": 16.0,
   "midpoint_distance_m": 13.5,
   "start_elevation_m": 187.77458306929648,
   "end_elevation_m": 187.27999919501667,
   "start_xy": [
    317980.28620827664,
    4466200.167275146
   ],
   "end_xy": [
    317980.1976665842,
    4466205.166491121
   ]
  },
  "min_10m": {
   "gradient_pct": -9.325750581904515,
   "start_distance_m": 10.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 15.0,
   "start_elevation_m": 187.86033811076766,
   "end_elevation_m": 186.9277630525772,
   "start_xy": [
    317980.30391661514,
    4466199.167431951
   ],
   "end_xy": [
    317980.12683323026,
    4466209.165863901
   ]
  },
  "min_20m": {
   "gradient_pct": -8.89861658168428,
   "start_distance_m": 9.0,
   "end_distance_m": 29.0,
   "midpoint_distance_m": 19.0,
   "start_elevation_m": 187.93925036192718,
   "end_elevation_m": 186.15952704559032,
   "start_xy": [
    317980.32162495365,
    4466198.1675887555
   ],
   "end_xy": [
    317979.819907298,
    4466218.15950099
   ]
  },
  "min_25m": {
   "gradient_pct": -8.609855552274212,
   "start_distance_m": 9.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 21.5,
   "start_elevation_m": 187.93925036192718,
   "end_elevation_m": 185.78678647385863,
   "start_xy": [
    317980.32162495365,
    4466198.1675887555
   ],
   "end_xy": [
    317979.5730894037,
    4466223.153405367
   ]
  },
  "min_50m": {
   "gradient_pct": -7.352571227207989,
   "start_distance_m": 2.0,
   "end_distance_m": 52.0,
   "midpoint_distance_m": 27.0,
   "start_elevation_m": 188.33608837325698,
   "end_elevation_m": 184.659802759653,
   "start_xy": [
    317980.4455833231,
    4466191.16868639
   ],
   "end_xy": [
    317976.53731145593,
    4466240.812680568
   ]
  },
  "min_100m": {
   "gradient_pct": -1.549358821255339,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 188.3357140360735,
   "end_elevation_m": 186.78635521481817,
   "start_xy": [
    317980.481,
    4466189.169
   ],
   "end_xy": [
    317969.24503536476,
    4466282.844546787
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.7379966933039,
   "start_distance_m": 348.0,
   "end_distance_m": 350.0,
   "midpoint_distance_m": 349.0,
   "start_elevation_m": 224.90353477380012,
   "end_elevation_m": 225.3982947076662,
   "start_xy": [
    318120.0862993765,
    4466417.601750567
   ],
   "end_xy": [
    318122.08571034105,
    4466417.553214034
   ]
  },
  "max_3m": {
   "gradient_pct": 24.293610774746337,
   "start_distance_m": 347.0,
   "end_distance_m": 350.0,
   "midpoint_distance_m": 348.5,
   "start_elevation_m": 224.6694863844238,
   "end_elevation_m": 225.3982947076662,
   "start_xy": [
    318119.08659389423,
    4466417.626018832
   ],
   "end_xy": [
    318122.08571034105,
    4466417.553214034
   ]
  }
 },
 "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": [
   "descends_at_start"
  ]
 },
 "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_one_meter_x31y447_PA_South_Central_B1_2017.tif"
  ],
  "calculated_at": "2026-09-07T14:55:50+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/pennsylvania-2026-09-07-batch-band3.osm.pbf",
  "osm_snapshot": "",
  "run_id": "pa-run4-260907",
  "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_South_Central_B1_2017 (collected 2017)",
  "elevation_tile_ids": [
   "x31y447"
  ],
  "route_summit_trim_m": 1007.4,
  "route_summit_trim_loss_m": 32.8,
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Carroll",
  "county": "Pennsylvania"
 }
}