{
 "ocl_version": "0.1.0",
 "name": "T481",
 "slug": "t481",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.248314407650582,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 851.0,
   "end_distance_m": 853.0,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 378.9815208351947,
   "min_gradient_pct": -15.38795772051742
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 21.965836931252625,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 851.0,
   "end_distance_m": 854.0,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 379.1955296549793,
   "min_gradient_pct": -14.824197718911591
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.69138533362343,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 851.0,
   "end_distance_m": 856.0,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 379.6211238137229,
   "min_gradient_pct": -13.566228366754558
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.269146235932226,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 850.0,
   "end_distance_m": 860.0,
   "start_elevation_m": 378.32785019471646,
   "end_elevation_m": 380.4547648183097,
   "min_gradient_pct": -10.74795670743356
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.67716378803283,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 847.0,
   "end_distance_m": 867.0,
   "start_elevation_m": 377.72868328593546,
   "end_elevation_m": 381.864116043542,
   "min_gradient_pct": -8.387929275205579
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.39119841104298,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 847.0,
   "end_distance_m": 872.0,
   "start_elevation_m": 377.72868328593546,
   "end_elevation_m": 382.8264828886962,
   "min_gradient_pct": -8.074459585212708
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.7498024972989,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 826.0,
   "end_distance_m": 876.0,
   "start_elevation_m": 374.1607156031081,
   "end_elevation_m": 383.53561685175754,
   "min_gradient_pct": -6.796122627336672
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.720243223929515,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 782.0,
   "end_distance_m": 882.0,
   "start_elevation_m": 366.8079146156276,
   "end_elevation_m": 384.52815783955714,
   "min_gradient_pct": -5.142667651956458
  }
 ],
 "shape": {
  "ascent_concentration": 0.518,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 264.0,
  "shape_class": "stepped"
 },
 "length_m": 1184.8621131835032,
 "start_elevation_m": 347.7195931284543,
 "end_elevation_m": 426.1534579153804,
 "endpoint_gain_m": 78.43386478692611,
 "overall_gradient_pct": 6.619661808257922,
 "accumulated_ascent_m": 90.05516501049311,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.69138533362343,
   "start_distance_m": 851.0,
   "end_distance_m": 856.0,
   "midpoint_distance_m": 853.5,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 379.6211238137229,
   "start_xy": [
    640467.3101261905,
    4516199.63099954
   ],
   "end_xy": [
    640462.3397798801,
    4516200.174743556
   ]
  },
  "max_10m": {
   "gradient_pct": 21.269146235932226,
   "start_distance_m": 850.0,
   "end_distance_m": 860.0,
   "midpoint_distance_m": 855.0,
   "start_elevation_m": 378.32785019471646,
   "end_elevation_m": 380.4547648183097,
   "start_xy": [
    640468.3041954526,
    4516199.522250737
   ],
   "end_xy": [
    640458.3635028319,
    4516200.609738769
   ]
  },
  "max_20m": {
   "gradient_pct": 20.67716378803283,
   "start_distance_m": 847.0,
   "end_distance_m": 867.0,
   "midpoint_distance_m": 857.0,
   "start_elevation_m": 377.72868328593546,
   "end_elevation_m": 381.864116043542,
   "start_xy": [
    640471.2864032389,
    4516199.196004327
   ],
   "end_xy": [
    640451.4050179974,
    4516201.370980391
   ]
  },
  "max_25m": {
   "gradient_pct": 20.39119841104298,
   "start_distance_m": 847.0,
   "end_distance_m": 872.0,
   "midpoint_distance_m": 859.5,
   "start_elevation_m": 377.72868328593546,
   "end_elevation_m": 382.8264828886962,
   "start_xy": [
    640471.2864032389,
    4516199.196004327
   ],
   "end_xy": [
    640446.434671687,
    4516201.914724408
   ]
  },
  "max_50m": {
   "gradient_pct": 18.7498024972989,
   "start_distance_m": 826.0,
   "end_distance_m": 876.0,
   "midpoint_distance_m": 851.0,
   "start_elevation_m": 374.1607156031081,
   "end_elevation_m": 383.53561685175754,
   "start_xy": [
    640492.2279124302,
    4516198.410906723
   ],
   "end_xy": [
    640442.4583946387,
    4516202.34971962
   ]
  },
  "max_100m": {
   "gradient_pct": 17.720243223929515,
   "start_distance_m": 782.0,
   "end_distance_m": 882.0,
   "midpoint_distance_m": 832.0,
   "start_elevation_m": 366.8079146156276,
   "end_elevation_m": 384.52815783955714,
   "start_xy": [
    640535.1110413475,
    4516206.47916535
   ],
   "end_xy": [
    640436.4939790663,
    4516203.00221244
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -13.566228366754558,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 347.7195931284543,
   "end_elevation_m": 347.04128171011655,
   "start_xy": [
    641227.738211247,
    4516544.5448345505
   ],
   "end_xy": [
    641223.290636237,
    4516542.2833781205
   ]
  },
  "min_10m": {
   "gradient_pct": -10.74795670743356,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 347.7195931284543,
   "end_elevation_m": 346.6447974577109,
   "start_xy": [
    641227.738211247,
    4516544.5448345505
   ],
   "end_xy": [
    641218.6865251093,
    4516540.333465116
   ]
  },
  "min_20m": {
   "gradient_pct": -8.387929275205579,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 347.7195931284543,
   "end_elevation_m": 346.04200727341316,
   "start_xy": [
    641227.738211247,
    4516544.5448345505
   ],
   "end_xy": [
    641209.478302854,
    4516536.433639108
   ]
  },
  "min_25m": {
   "gradient_pct": -8.074459585212708,
   "start_distance_m": 357.0,
   "end_distance_m": 382.0,
   "midpoint_distance_m": 369.5,
   "start_elevation_m": 359.3602601771911,
   "end_elevation_m": 357.3416452808879,
   "start_xy": [
    640889.5215058697,
    4516431.596525364
   ],
   "end_xy": [
    640865.9669095937,
    4516423.240602608
   ]
  },
  "min_50m": {
   "gradient_pct": -6.796122627336672,
   "start_distance_m": 347.0,
   "end_distance_m": 397.0,
   "midpoint_distance_m": 372.0,
   "start_elevation_m": 359.9783770038322,
   "end_elevation_m": 356.58031569016384,
   "start_xy": [
    640899.0894471142,
    4516434.473214452
   ],
   "end_xy": [
    640852.3546681324,
    4516416.939262877
   ]
  },
  "min_100m": {
   "gradient_pct": -5.142667651956458,
   "start_distance_m": 324.0,
   "end_distance_m": 424.0,
   "midpoint_distance_m": 374.0,
   "start_elevation_m": 360.7016297800493,
   "end_elevation_m": 355.55896212809284,
   "start_xy": [
    640921.3743823608,
    4516440.1637031
   ],
   "end_xy": [
    640828.3249168835,
    4516404.6979326885
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.248314407650582,
   "start_distance_m": 851.0,
   "end_distance_m": 853.0,
   "midpoint_distance_m": 852.0,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 378.9815208351947,
   "start_xy": [
    640467.3101261905,
    4516199.63099954
   ],
   "end_xy": [
    640465.3219876664,
    4516199.848497147
   ]
  },
  "max_3m": {
   "gradient_pct": 21.965836931252625,
   "start_distance_m": 851.0,
   "end_distance_m": 854.0,
   "midpoint_distance_m": 852.5,
   "start_elevation_m": 378.5365545470417,
   "end_elevation_m": 379.1955296549793,
   "start_xy": [
    640467.3101261905,
    4516199.63099954
   ],
   "end_xy": [
    640464.3279184044,
    4516199.95724595
   ]
  }
 },
 "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:26917",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/pa-west/USGS_1M_17_x64y452_PA_WesternPA_2019_D20.tif"
  ],
  "calculated_at": "2026-09-07T23:38:41+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.osm.pbf",
  "osm_snapshot": "2026-09-06T20:21:35Z",
  "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_WesternPA_2019_D20 (collected 2020)",
  "elevation_tile_ids": [
   "x64y452"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: PA_WesternPA_2019_D20: HTTP Error 404: Not Found",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Rural Valley",
  "county": "Pennsylvania"
 }
}