{
 "ocl_version": "0.1.0",
 "name": "18th Street",
 "slug": "18th-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 37.12061701512255,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 110.0,
   "end_distance_m": 112.0,
   "start_elevation_m": 259.0179227931014,
   "end_elevation_m": 259.7603351334038,
   "min_gradient_pct": 2.1714055979487057
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 34.79379249184262,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 110.0,
   "end_distance_m": 113.0,
   "start_elevation_m": 259.0179227931014,
   "end_elevation_m": 260.06173656785666,
   "min_gradient_pct": 2.3184997189825176
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.956373426604614,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "start_elevation_m": 258.71903291935297,
   "end_elevation_m": 260.3168515906832,
   "min_gradient_pct": 2.4379384777512314
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.715745623588134,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 60.0,
   "end_distance_m": 70.0,
   "start_elevation_m": 247.55239304488984,
   "end_elevation_m": 250.22396760724865,
   "min_gradient_pct": 2.7007861323903626
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.632275104958353,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "start_elevation_m": 247.311234393684,
   "end_elevation_m": 252.43768941467567,
   "min_gradient_pct": 2.9845311320679
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.09610375831528,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 59.0,
   "end_distance_m": 84.0,
   "start_elevation_m": 247.311234393684,
   "end_elevation_m": 253.58526033326282,
   "min_gradient_pct": 3.115560175838027
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 23.397484246454322,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 54.0,
   "end_distance_m": 104.0,
   "start_elevation_m": 246.4346855283588,
   "end_elevation_m": 258.133427651586,
   "min_gradient_pct": 4.436364565582153
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.93820544813002,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 2.0,
   "end_distance_m": 102.0,
   "start_elevation_m": 234.83506550803764,
   "end_elevation_m": 257.77327095616766,
   "min_gradient_pct": 8.46422334150725
  }
 ],
 "shape": {
  "ascent_concentration": 0.373,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 193.0,
  "shape_class": "sustained"
 },
 "length_m": 237.70594419488566,
 "start_elevation_m": 234.48943931580413,
 "end_elevation_m": 272.21298218536185,
 "endpoint_gain_m": 37.72354286955772,
 "overall_gradient_pct": 15.869835732264939,
 "accumulated_ascent_m": 37.72354286955772,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.956373426604614,
   "start_distance_m": 109.0,
   "end_distance_m": 114.0,
   "midpoint_distance_m": 111.5,
   "start_elevation_m": 258.71903291935297,
   "end_elevation_m": 260.3168515906832,
   "start_xy": [
    563753.2856842786,
    4503068.722261828
   ],
   "end_xy": [
    563757.6176445214,
    4503066.225439758
   ]
  },
  "max_10m": {
   "gradient_pct": 26.715745623588134,
   "start_distance_m": 60.0,
   "end_distance_m": 70.0,
   "midpoint_distance_m": 65.0,
   "start_elevation_m": 247.55239304488984,
   "end_elevation_m": 250.22396760724865,
   "start_xy": [
    563704.8366552353,
    4503071.06938416
   ],
   "end_xy": [
    563714.8364445001,
    4503071.004463751
   ]
  },
  "max_20m": {
   "gradient_pct": 25.632275104958353,
   "start_distance_m": 59.0,
   "end_distance_m": 79.0,
   "midpoint_distance_m": 69.0,
   "start_elevation_m": 247.311234393684,
   "end_elevation_m": 252.43768941467567,
   "start_xy": [
    563703.8366763088,
    4503071.0758762015
   ],
   "end_xy": [
    563723.8362548384,
    4503070.946035382
   ]
  },
  "max_25m": {
   "gradient_pct": 25.09610375831528,
   "start_distance_m": 59.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 71.5,
   "start_elevation_m": 247.311234393684,
   "end_elevation_m": 253.58526033326282,
   "start_xy": [
    563703.8366763088,
    4503071.0758762015
   ],
   "end_xy": [
    563728.8361494709,
    4503070.913575178
   ]
  },
  "max_50m": {
   "gradient_pct": 23.397484246454322,
   "start_distance_m": 54.0,
   "end_distance_m": 104.0,
   "midpoint_distance_m": 79.0,
   "start_elevation_m": 246.4346855283588,
   "end_elevation_m": 258.133427651586,
   "start_xy": [
    563698.8367816764,
    4503071.108336407
   ],
   "end_xy": [
    563748.8357280004,
    4503070.783734359
   ]
  },
  "max_100m": {
   "gradient_pct": 22.93820544813002,
   "start_distance_m": 2.0,
   "end_distance_m": 102.0,
   "midpoint_distance_m": 52.0,
   "start_elevation_m": 234.83506550803764,
   "end_elevation_m": 257.77327095616766,
   "start_xy": [
    563646.8369938293,
    4503071.0049682
   ],
   "end_xy": [
    563746.8357701475,
    4503070.796718441
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 2.4379384777512314,
   "start_distance_m": 215.0,
   "end_distance_m": 220.0,
   "midpoint_distance_m": 217.5,
   "start_elevation_m": 271.49897141109955,
   "end_elevation_m": 271.6208683349871,
   "start_xy": [
    563835.6784766323,
    4503006.7130842395
   ],
   "end_xy": [
    563837.5604779476,
    4503002.080798513
   ]
  },
  "min_10m": {
   "gradient_pct": 2.7007861323903626,
   "start_distance_m": 209.0,
   "end_distance_m": 219.0,
   "midpoint_distance_m": 214.0,
   "start_elevation_m": 271.32466284213757,
   "end_elevation_m": 271.5947414553766,
   "start_xy": [
    563833.420075054,
    4503012.271827111
   ],
   "end_xy": [
    563837.1840776845,
    4503003.0072556585
   ]
  },
  "min_20m": {
   "gradient_pct": 2.9845311320679,
   "start_distance_m": 207.0,
   "end_distance_m": 227.0,
   "midpoint_distance_m": 217.0,
   "start_elevation_m": 271.2665867705031,
   "end_elevation_m": 271.8634929969167,
   "start_xy": [
    563832.667274528,
    4503014.1247414015
   ],
   "end_xy": [
    563840.1952797889,
    4502995.5955984965
   ]
  },
  "min_25m": {
   "gradient_pct": 3.115560175838027,
   "start_distance_m": 202.0,
   "end_distance_m": 227.0,
   "midpoint_distance_m": 214.5,
   "start_elevation_m": 271.0846029529572,
   "end_elevation_m": 271.8634929969167,
   "start_xy": [
    563830.7852732128,
    4503018.757027127
   ],
   "end_xy": [
    563840.1952797889,
    4502995.5955984965
   ]
  },
  "min_50m": {
   "gradient_pct": 4.436364565582153,
   "start_distance_m": 187.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 212.0,
   "start_elevation_m": 269.9824700999536,
   "end_elevation_m": 272.2006523827447,
   "start_xy": [
    563820.7023832662,
    4503029.494283528
   ],
   "end_xy": [
    563843.9592824193,
    4502986.331027044
   ]
  },
  "min_100m": {
   "gradient_pct": 8.46422334150725,
   "start_distance_m": 137.0,
   "end_distance_m": 237.0,
   "midpoint_distance_m": 187.0,
   "start_elevation_m": 263.73642904123744,
   "end_elevation_m": 272.2006523827447,
   "start_xy": [
    563777.5446616382,
    4503054.74005823
   ],
   "end_xy": [
    563843.9592824193,
    4502986.331027044
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 37.12061701512255,
   "start_distance_m": 110.0,
   "end_distance_m": 112.0,
   "midpoint_distance_m": 111.0,
   "start_elevation_m": 259.0179227931014,
   "end_elevation_m": 259.7603351334038,
   "start_xy": [
    563754.1520763271,
    4503068.222897414
   ],
   "end_xy": [
    563755.8848604243,
    4503067.224168586
   ]
  },
  "max_3m": {
   "gradient_pct": 34.79379249184262,
   "start_distance_m": 110.0,
   "end_distance_m": 113.0,
   "midpoint_distance_m": 111.5,
   "start_elevation_m": 259.0179227931014,
   "end_elevation_m": 260.06173656785666,
   "start_xy": [
    563754.1520763271,
    4503068.222897414
   ],
   "end_xy": [
    563756.7512524729,
    4503066.724804171
   ]
  }
 },
 "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"
  ]
 },
 "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_x56y451_PA_WesternPA_2019_D20.tif"
  ],
  "calculated_at": "2026-09-07T11:04:44+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": [
   "x56y451"
  ],
  "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": "Freedom",
  "county": "Pennsylvania"
 }
}