{
 "ocl_version": "0.1.0",
 "name": "Sumey Road",
 "slug": "sumey-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 25.769821560322725,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 437.0,
   "end_distance_m": 439.0,
   "start_elevation_m": 516.6619949198578,
   "end_elevation_m": 517.1773913510642,
   "min_gradient_pct": -13.722423846166976
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 24.521302668665612,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 457.0,
   "end_distance_m": 460.0,
   "start_elevation_m": 520.5994943616482,
   "end_elevation_m": 521.3351334417082,
   "min_gradient_pct": -12.294588288760147
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.715071578865263,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 451.0,
   "end_distance_m": 456.0,
   "start_elevation_m": 519.2517074038021,
   "end_elevation_m": 520.4374609827454,
   "min_gradient_pct": -11.617054617379381
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.03215062629988,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 451.0,
   "end_distance_m": 461.0,
   "start_elevation_m": 519.2517074038021,
   "end_elevation_m": 521.5549224664321,
   "min_gradient_pct": -10.363607928348983
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.601642284959212,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 444.0,
   "end_distance_m": 464.0,
   "start_elevation_m": 517.8842925120797,
   "end_elevation_m": 522.0046209690715,
   "min_gradient_pct": -9.3918160891414
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.22740016691705,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 437.0,
   "end_distance_m": 462.0,
   "start_elevation_m": 516.6619949198578,
   "end_elevation_m": 521.718844961587,
   "min_gradient_pct": -8.568400703680481
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.67526970974768,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 411.0,
   "end_distance_m": 461.0,
   "start_elevation_m": 512.2172876115583,
   "end_elevation_m": 521.5549224664321,
   "min_gradient_pct": -5.764225749245725
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.177203771938252,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 385.0,
   "end_distance_m": 485.0,
   "start_elevation_m": 507.9060832747889,
   "end_elevation_m": 525.0832870467272,
   "min_gradient_pct": -2.9124600247877197
  }
 ],
 "shape": {
  "ascent_concentration": 0.482,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 115.0,
  "shape_class": "stepped"
 },
 "length_m": 1320.999999999815,
 "start_elevation_m": 486.14079934094445,
 "end_elevation_m": 562.6257480924319,
 "endpoint_gain_m": 76.48494875148742,
 "overall_gradient_pct": 5.78992799027238,
 "accumulated_ascent_m": 83.10129831058521,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.715071578865263,
   "start_distance_m": 451.0,
   "end_distance_m": 456.0,
   "midpoint_distance_m": 453.5,
   "start_elevation_m": 519.2517074038021,
   "end_elevation_m": 520.4374609827454,
   "start_xy": [
    616114.1434568914,
    4401791.218139269
   ],
   "end_xy": [
    616109.7151557457,
    4401788.896469835
   ]
  },
  "max_10m": {
   "gradient_pct": 23.03215062629988,
   "start_distance_m": 451.0,
   "end_distance_m": 461.0,
   "midpoint_distance_m": 456.0,
   "start_elevation_m": 519.2517074038021,
   "end_elevation_m": 521.5549224664321,
   "start_xy": [
    616114.1434568914,
    4401791.218139269
   ],
   "end_xy": [
    616105.2868546002,
    4401786.5748004
   ]
  },
  "max_20m": {
   "gradient_pct": 20.601642284959212,
   "start_distance_m": 444.0,
   "end_distance_m": 464.0,
   "midpoint_distance_m": 454.0,
   "start_elevation_m": 517.8842925120797,
   "end_elevation_m": 522.0046209690715,
   "start_xy": [
    616120.3430784954,
    4401794.468476478
   ],
   "end_xy": [
    616102.6298739128,
    4401785.181798739
   ]
  },
  "max_25m": {
   "gradient_pct": 20.22740016691705,
   "start_distance_m": 437.0,
   "end_distance_m": 462.0,
   "midpoint_distance_m": 449.5,
   "start_elevation_m": 516.6619949198578,
   "end_elevation_m": 521.718844961587,
   "start_xy": [
    616126.5427000993,
    4401797.718813687
   ],
   "end_xy": [
    616104.401194371,
    4401786.110466514
   ]
  },
  "max_50m": {
   "gradient_pct": 18.67526970974768,
   "start_distance_m": 411.0,
   "end_distance_m": 461.0,
   "midpoint_distance_m": 436.0,
   "start_elevation_m": 512.2172876115583,
   "end_elevation_m": 521.5549224664321,
   "start_xy": [
    616149.5698660567,
    4401809.791494746
   ],
   "end_xy": [
    616105.2868546002,
    4401786.5748004
   ]
  },
  "max_100m": {
   "gradient_pct": 17.177203771938252,
   "start_distance_m": 385.0,
   "end_distance_m": 485.0,
   "midpoint_distance_m": 435.0,
   "start_elevation_m": 507.9060832747889,
   "end_elevation_m": 525.0832870467272,
   "start_xy": [
    616171.2346874808,
    4401823.895383844
   ],
   "end_xy": [
    616084.031009101,
    4401775.430787114
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -11.617054617379381,
   "start_distance_m": 321.0,
   "end_distance_m": 326.0,
   "midpoint_distance_m": 323.5,
   "start_elevation_m": 508.278878182223,
   "end_elevation_m": 507.69802545135406,
   "start_xy": [
    616220.2378934247,
    4401865.061945606
   ],
   "end_xy": [
    616216.4095179604,
    4401861.845807968
   ]
  },
  "min_10m": {
   "gradient_pct": -10.363607928348983,
   "start_distance_m": 316.0,
   "end_distance_m": 326.0,
   "midpoint_distance_m": 321.0,
   "start_elevation_m": 508.73438624418895,
   "end_elevation_m": 507.69802545135406,
   "start_xy": [
    616224.0662688891,
    4401868.278083243
   ],
   "end_xy": [
    616216.4095179604,
    4401861.845807968
   ]
  },
  "min_20m": {
   "gradient_pct": -9.3918160891414,
   "start_distance_m": 315.0,
   "end_distance_m": 335.0,
   "midpoint_distance_m": 325.0,
   "start_elevation_m": 508.8306894492876,
   "end_elevation_m": 506.9523262314593,
   "start_xy": [
    616224.8319439819,
    4401868.92131077
   ],
   "end_xy": [
    616209.5184421245,
    4401856.056760221
   ]
  },
  "min_25m": {
   "gradient_pct": -8.568400703680481,
   "start_distance_m": 314.0,
   "end_distance_m": 339.0,
   "midpoint_distance_m": 326.5,
   "start_elevation_m": 508.8902186417207,
   "end_elevation_m": 506.7481184658006,
   "start_xy": [
    616225.5976190749,
    4401869.564538298
   ],
   "end_xy": [
    616206.455741753,
    4401853.48385011
   ]
  },
  "min_50m": {
   "gradient_pct": -5.764225749245725,
   "start_distance_m": 289.0,
   "end_distance_m": 339.0,
   "midpoint_distance_m": 314.0,
   "start_elevation_m": 509.63023134042345,
   "end_elevation_m": 506.7481184658006,
   "start_xy": [
    616244.7517971344,
    4401885.628445866
   ],
   "end_xy": [
    616206.455741753,
    4401853.48385011
   ]
  },
  "min_100m": {
   "gradient_pct": -2.9124600247877197,
   "start_distance_m": 272.0,
   "end_distance_m": 372.0,
   "midpoint_distance_m": 322.0,
   "start_elevation_m": 509.7616171187261,
   "end_elevation_m": 506.8491570939384,
   "start_xy": [
    616259.0970459315,
    4401894.750607722
   ],
   "end_xy": [
    616181.1884636882,
    4401832.2573417025
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 25.769821560322725,
   "start_distance_m": 437.0,
   "end_distance_m": 439.0,
   "midpoint_distance_m": 438.0,
   "start_elevation_m": 516.6619949198578,
   "end_elevation_m": 517.1773913510642,
   "start_xy": [
    616126.5427000993,
    4401797.718813687
   ],
   "end_xy": [
    616124.771379641,
    4401796.790145912
   ]
  },
  "max_3m": {
   "gradient_pct": 24.521302668665612,
   "start_distance_m": 457.0,
   "end_distance_m": 460.0,
   "midpoint_distance_m": 458.5,
   "start_elevation_m": 520.5994943616482,
   "end_elevation_m": 521.3351334417082,
   "start_xy": [
    616108.8294955166,
    4401788.432135948
   ],
   "end_xy": [
    616106.1725148293,
    4401787.039134287
   ]
  }
 },
 "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_x61y441_PA_WesternPA_2019_D20.tif"
  ],
  "calculated_at": "2026-09-07T16:30:50+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-band1.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_WesternPA_2019_D20 (collected 2020)",
  "elevation_tile_ids": [
   "x61y441"
  ],
  "route_summit_trim_m": 1281.7,
  "route_summit_trim_loss_m": 39.0,
  "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": "Wharton",
  "county": "Pennsylvania"
 },
 "review_flags": [
  {
   "kind": "possible-bridge-or-hollow",
   "span_m": [
    299.0,
    457.0
   ],
   "status": "pending-human-review",
   "noted": "2026-09-21",
   "figure_adjusted": false
  }
 ]
}