{
 "ocl_version": "0.1.0",
 "name": "Ponderosa Pine Road",
 "slug": "ponderosa-pine-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 48.98118381643144,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 228.0,
   "end_distance_m": 230.0,
   "start_elevation_m": 376.1233045622108,
   "end_elevation_m": 377.10292823853945,
   "min_gradient_pct": -10.258196343184522
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.77110449280318,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 228.0,
   "end_distance_m": 231.0,
   "start_elevation_m": 376.1233045622108,
   "end_elevation_m": 377.4364376969949,
   "min_gradient_pct": -9.147186383874365
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.64516024677641,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 173.0,
   "end_distance_m": 178.0,
   "start_elevation_m": 366.1510708310999,
   "end_elevation_m": 368.0833288434387,
   "min_gradient_pct": -7.614612347634875
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 31.90918313419843,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 172.0,
   "end_distance_m": 182.0,
   "start_elevation_m": 365.8018715375033,
   "end_elevation_m": 368.99278985092315,
   "min_gradient_pct": -3.656409592101113
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 27.483471213772646,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 170.0,
   "end_distance_m": 190.0,
   "start_elevation_m": 365.3213688161437,
   "end_elevation_m": 370.81806305889825,
   "min_gradient_pct": 1.0525441663531865
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.979372660133322,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 172.0,
   "end_distance_m": 197.0,
   "start_elevation_m": 365.8018715375033,
   "end_elevation_m": 372.54671470253663,
   "min_gradient_pct": 2.1055461359173933
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.177553982997438,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 150.0,
   "end_distance_m": 200.0,
   "start_elevation_m": 361.7690608332564,
   "end_elevation_m": 373.3578378247551,
   "min_gradient_pct": 4.589451895415891
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.915861122981596,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 141.0,
   "end_distance_m": 241.0,
   "start_elevation_m": 360.16705464894557,
   "end_elevation_m": 379.08291577192716,
   "min_gradient_pct": 7.000026297615818
  }
 ],
 "shape": {
  "ascent_concentration": 0.304,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 138.0,
  "shape_class": "sustained"
 },
 "length_m": 587.6000000000338,
 "start_elevation_m": 346.3291931695835,
 "end_elevation_m": 429.82723590408756,
 "endpoint_gain_m": 83.49804273450405,
 "overall_gradient_pct": 14.21001408007135,
 "accumulated_ascent_m": 84.39488044674926,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.64516024677641,
   "start_distance_m": 173.0,
   "end_distance_m": 178.0,
   "midpoint_distance_m": 175.5,
   "start_elevation_m": 366.1510708310999,
   "end_elevation_m": 368.0833288434387,
   "start_xy": [
    487244.5224535818,
    4594442.492655775
   ],
   "end_xy": [
    487249.47869782377,
    4594443.152688308
   ]
  },
  "max_10m": {
   "gradient_pct": 31.90918313419843,
   "start_distance_m": 172.0,
   "end_distance_m": 182.0,
   "midpoint_distance_m": 177.0,
   "start_elevation_m": 365.8018715375033,
   "end_elevation_m": 368.99278985092315,
   "start_xy": [
    487243.5312001245,
    4594442.360683887
   ],
   "end_xy": [
    487253.44369670213,
    4594443.680688158
   ]
  },
  "max_20m": {
   "gradient_pct": 27.483471213772646,
   "start_distance_m": 170.0,
   "end_distance_m": 190.0,
   "midpoint_distance_m": 180.0,
   "start_elevation_m": 365.3213688161437,
   "end_elevation_m": 370.81806305889825,
   "start_xy": [
    487241.54870006704,
    4594442.096688606
   ],
   "end_xy": [
    487261.37356322515,
    4594444.737670379
   ]
  },
  "max_25m": {
   "gradient_pct": 26.979372660133322,
   "start_distance_m": 172.0,
   "end_distance_m": 197.0,
   "midpoint_distance_m": 184.5,
   "start_elevation_m": 365.8018715375033,
   "end_elevation_m": 372.54671470253663,
   "start_xy": [
    487243.5312001245,
    4594442.360683887
   ],
   "end_xy": [
    487268.3123075265,
    4594445.661698179
   ]
  },
  "max_50m": {
   "gradient_pct": 23.177553982997438,
   "start_distance_m": 150.0,
   "end_distance_m": 200.0,
   "midpoint_distance_m": 175.0,
   "start_elevation_m": 361.7690608332564,
   "end_elevation_m": 373.3578378247551,
   "start_xy": [
    487224.8642981897,
    4594432.999308647
   ],
   "end_xy": [
    487271.28605170915,
    4594446.057735444
   ]
  },
  "max_100m": {
   "gradient_pct": 18.915861122981596,
   "start_distance_m": 141.0,
   "end_distance_m": 241.0,
   "midpoint_distance_m": 191.0,
   "start_elevation_m": 360.16705464894557,
   "end_elevation_m": 379.08291577192716,
   "start_xy": [
    487218.49034535623,
    4594426.64535568
   ],
   "end_xy": [
    487312.056212202,
    4594446.469816048
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.614612347634875,
   "start_distance_m": 35.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 37.5,
   "start_elevation_m": 351.9918248834371,
   "end_elevation_m": 351.6110942660554,
   "start_xy": [
    487169.280706375,
    4594340.047886488
   ],
   "end_xy": [
    487169.5931514926,
    4594345.038114121
   ]
  },
  "min_10m": {
   "gradient_pct": -3.656409592101113,
   "start_distance_m": 32.0,
   "end_distance_m": 42.0,
   "midpoint_distance_m": 37.0,
   "start_elevation_m": 351.99224046494,
   "end_elevation_m": 351.62659950572987,
   "start_xy": [
    487168.56019843067,
    4594337.596469241
   ],
   "end_xy": [
    487169.71815713134,
    4594347.0342034465
   ]
  },
  "min_20m": {
   "gradient_pct": 1.0525441663531865,
   "start_distance_m": 34.0,
   "end_distance_m": 54.0,
   "midpoint_distance_m": 44.0,
   "start_elevation_m": 352.0361058692264,
   "end_elevation_m": 352.246614702497,
   "start_xy": [
    487169.21813457634,
    4594339.049846145
   ],
   "end_xy": [
    487170.4686952769,
    4594359.010707844
   ]
  },
  "min_25m": {
   "gradient_pct": 2.1055461359173933,
   "start_distance_m": 32.0,
   "end_distance_m": 57.0,
   "midpoint_distance_m": 44.5,
   "start_elevation_m": 351.99224046494,
   "end_elevation_m": 352.51862699891933,
   "start_xy": [
    487168.56019843067,
    4594337.596469241
   ],
   "end_xy": [
    487170.6561345774,
    4594362.004846163
   ]
  },
  "min_50m": {
   "gradient_pct": 4.589451895415891,
   "start_distance_m": 32.0,
   "end_distance_m": 82.0,
   "midpoint_distance_m": 57.0,
   "start_elevation_m": 351.99224046494,
   "end_elevation_m": 354.2869664126479,
   "start_xy": [
    487168.56019843067,
    4594337.596469241
   ],
   "end_xy": [
    487176.7043481093,
    4594384.992863583
   ]
  },
  "min_100m": {
   "gradient_pct": 7.000026297615818,
   "start_distance_m": 32.0,
   "end_distance_m": 132.0,
   "midpoint_distance_m": 82.0,
   "start_elevation_m": 351.99224046494,
   "end_elevation_m": 358.9922667625558,
   "start_xy": [
    487168.56019843067,
    4594337.596469241
   ],
   "end_xy": [
    487212.11589270254,
    4594420.291904305
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 48.98118381643144,
   "start_distance_m": 228.0,
   "end_distance_m": 230.0,
   "midpoint_distance_m": 229.0,
   "start_elevation_m": 376.1233045622108,
   "end_elevation_m": 377.10292823853945,
   "start_xy": [
    487299.0999121305,
    4594447.534840727
   ],
   "end_xy": [
    487301.0931750086,
    4594447.370819107
   ]
  },
  "max_3m": {
   "gradient_pct": 43.77110449280318,
   "start_distance_m": 228.0,
   "end_distance_m": 231.0,
   "midpoint_distance_m": 229.5,
   "start_elevation_m": 376.1233045622108,
   "end_elevation_m": 377.4364376969949,
   "start_xy": [
    487299.0999121305,
    4594447.534840727
   ],
   "end_xy": [
    487302.0898098088,
    4594447.288849143
   ]
  }
 },
 "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",
   "may_continue_beyond_end"
  ]
 },
 "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_x48y460_PA_Northcentral_2019_B19.tif"
  ],
  "calculated_at": "2026-09-08T20:55:48+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": "retro-box-260908",
  "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": [
   "x48y460"
  ],
  "route_base_cut_m": 243.2,
  "route_cut_m": 587.6,
  "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": "Palmyra",
  "county": "Pennsylvania"
 }
}