{
 "ocl_version": "0.1.0",
 "name": "Songbird Road",
 "slug": "songbird-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.78000123601055,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1996.0,
   "end_distance_m": 1998.0,
   "start_elevation_m": 566.2689606708497,
   "end_elevation_m": 566.9445606955699,
   "min_gradient_pct": -4.951127003369038
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.70112629106643,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 1998.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 566.9445606955699,
   "min_gradient_pct": -4.845198455291211
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 30.75952581446927,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 2000.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 567.4715031975613,
   "min_gradient_pct": -4.66969602387735
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.03511175224412,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 2005.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 568.5370380820623,
   "min_gradient_pct": -4.536178880730404
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.584800182110826,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 2015.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 570.65048694326,
   "min_gradient_pct": -4.41460280925412
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.14084534340327,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 2020.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 571.7187382426887,
   "min_gradient_pct": -4.428461540288936
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.753907015882078,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1981.0,
   "end_distance_m": 2031.0,
   "start_elevation_m": 563.2760902962876,
   "end_elevation_m": 574.1530438042287,
   "min_gradient_pct": -4.220647854529716
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.920253583377303,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1995.0,
   "end_distance_m": 2095.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 585.8537804902152,
   "min_gradient_pct": -4.119865467807358
  }
 ],
 "shape": {
  "ascent_concentration": 0.68,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 482.0,
  "shape_class": "stepped"
 },
 "length_m": 7754.452520749448,
 "start_elevation_m": 451.2061741149914,
 "end_elevation_m": 682.7773031738285,
 "endpoint_gain_m": 231.57112905883707,
 "overall_gradient_pct": 2.9862988836310045,
 "accumulated_ascent_m": 276.4194426275281,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 30.75952581446927,
   "start_distance_m": 1995.0,
   "end_distance_m": 2000.0,
   "midpoint_distance_m": 1997.5,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 567.4715031975613,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693543.4458120189,
    4643632.206427641
   ]
  },
  "max_10m": {
   "gradient_pct": 26.03511175224412,
   "start_distance_m": 1995.0,
   "end_distance_m": 2005.0,
   "midpoint_distance_m": 2000.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 568.5370380820623,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693541.3834606911,
    4643627.65157232
   ]
  },
  "max_20m": {
   "gradient_pct": 23.584800182110826,
   "start_distance_m": 1995.0,
   "end_distance_m": 2015.0,
   "midpoint_distance_m": 2005.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 570.65048694326,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693538.2711089385,
    4643618.151874689
   ]
  },
  "max_25m": {
   "gradient_pct": 23.14084534340327,
   "start_distance_m": 1995.0,
   "end_distance_m": 2020.0,
   "midpoint_distance_m": 2007.5,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 571.7187382426887,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693536.74461325,
    4643613.3905922035
   ]
  },
  "max_50m": {
   "gradient_pct": 21.753907015882078,
   "start_distance_m": 1981.0,
   "end_distance_m": 2031.0,
   "midpoint_distance_m": 2006.0,
   "start_elevation_m": 563.2760902962876,
   "end_elevation_m": 574.1530438042287,
   "start_xy": [
    693551.282747065,
    4643649.514877863
   ],
   "end_xy": [
    693533.3863227355,
    4643602.915770734
   ]
  },
  "max_100m": {
   "gradient_pct": 19.920253583377303,
   "start_distance_m": 1995.0,
   "end_distance_m": 2095.0,
   "midpoint_distance_m": 2045.0,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 585.8537804902152,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693517.540953772,
    4643541.516454592
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -4.66969602387735,
   "start_distance_m": 4824.0,
   "end_distance_m": 4829.0,
   "midpoint_distance_m": 4826.5,
   "start_elevation_m": 666.74248534639,
   "end_elevation_m": 666.5090005451962,
   "start_xy": [
    691677.6298483112,
    4641956.174324117
   ],
   "end_xy": [
    691673.625341525,
    4641953.180342587
   ]
  },
  "min_10m": {
   "gradient_pct": -4.536178880730404,
   "start_distance_m": 4822.0,
   "end_distance_m": 4832.0,
   "midpoint_distance_m": 4827.0,
   "start_elevation_m": 666.8286034039965,
   "end_elevation_m": 666.3749855159234,
   "start_xy": [
    691679.2316510257,
    4641957.371916728
   ],
   "end_xy": [
    691671.2226374531,
    4641951.383953669
   ]
  },
  "min_20m": {
   "gradient_pct": -4.41460280925412,
   "start_distance_m": 4809.0,
   "end_distance_m": 4829.0,
   "midpoint_distance_m": 4819.0,
   "start_elevation_m": 667.391921107047,
   "end_elevation_m": 666.5090005451962,
   "start_xy": [
    691689.6433686701,
    4641965.156268705
   ],
   "end_xy": [
    691673.625341525,
    4641953.180342587
   ]
  },
  "min_25m": {
   "gradient_pct": -4.428461540288936,
   "start_distance_m": 4804.0,
   "end_distance_m": 4829.0,
   "midpoint_distance_m": 4816.5,
   "start_elevation_m": 667.6161159302684,
   "end_elevation_m": 666.5090005451962,
   "start_xy": [
    691693.6478754565,
    4641968.150250234
   ],
   "end_xy": [
    691673.625341525,
    4641953.180342587
   ]
  },
  "min_50m": {
   "gradient_pct": -4.220647854529716,
   "start_distance_m": 4796.0,
   "end_distance_m": 4846.0,
   "midpoint_distance_m": 4821.0,
   "start_elevation_m": 667.9089290147806,
   "end_elevation_m": 665.7986050875157,
   "start_xy": [
    691700.0550863146,
    4641972.940620681
   ],
   "end_xy": [
    691660.0100184515,
    4641943.000805387
   ]
  },
  "min_100m": {
   "gradient_pct": -4.119865467807358,
   "start_distance_m": 4381.0,
   "end_distance_m": 4481.0,
   "midpoint_distance_m": 4431.0,
   "start_elevation_m": 672.8629441388031,
   "end_elevation_m": 668.7430786709957,
   "start_xy": [
    692099.0877979608,
    4642071.0518522505
   ],
   "end_xy": [
    691999.536097823,
    4642061.777194834
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.78000123601055,
   "start_distance_m": 1996.0,
   "end_distance_m": 1998.0,
   "midpoint_distance_m": 1997.0,
   "start_elevation_m": 566.2689606708497,
   "end_elevation_m": 566.9445606955699,
   "start_xy": [
    693545.0956930813,
    4643635.850311899
   ],
   "end_xy": [
    693544.2707525501,
    4643634.02836977
   ]
  },
  "max_3m": {
   "gradient_pct": 33.70112629106643,
   "start_distance_m": 1995.0,
   "end_distance_m": 1998.0,
   "midpoint_distance_m": 1996.5,
   "start_elevation_m": 565.9335269068379,
   "end_elevation_m": 566.9445606955699,
   "start_xy": [
    693545.5081633469,
    4643636.761282963
   ],
   "end_xy": [
    693544.2707525501,
    4643634.02836977
   ]
  }
 },
 "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": []
 },
 "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:26917",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/pa-west/USGS_1M_17_x69y464_PA_Northcentral_2019_B19.tif",
   "data/cache/usa/pa-west/USGS_1M_17_x69y465_PA_Northcentral_2019_B19.tif"
  ],
  "calculated_at": "2026-09-07T12:56:31+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-band2.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_Northcentral_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
   "x69y464",
   "x69y465"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: PA_Northcentral_2019_B19: HTTP Error 404: Not Found",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Bradford",
  "county": "Pennsylvania"
 }
}