{
 "ocl_version": "0.1.0",
 "name": "Nelson Street",
 "slug": "nelson-street-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.777324052037784,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 316.0,
   "end_distance_m": 318.0,
   "start_elevation_m": 268.8029502656183,
   "end_elevation_m": 269.25849674665903,
   "min_gradient_pct": -11.098183562909014
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.18509487170195,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 316.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 268.8029502656183,
   "end_elevation_m": 269.46850311176934,
   "min_gradient_pct": -10.65858215142157
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 21.102381820986125,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 160.0,
   "end_distance_m": 165.0,
   "start_elevation_m": 242.5066938373617,
   "end_elevation_m": 243.561812928411,
   "min_gradient_pct": -9.63988638114813
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.029454917228918,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 169.0,
   "end_distance_m": 179.0,
   "start_elevation_m": 244.3642563105472,
   "end_elevation_m": 246.4672018022701,
   "min_gradient_pct": -6.553494536511266
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.846826255291262,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 160.0,
   "end_distance_m": 180.0,
   "start_elevation_m": 242.5066938373617,
   "end_elevation_m": 246.67605908841995,
   "min_gradient_pct": -2.414541216630113
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.689520132773055,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 156.0,
   "end_distance_m": 181.0,
   "start_elevation_m": 241.70708645473752,
   "end_elevation_m": 246.87946648793078,
   "min_gradient_pct": -0.9082818528893313
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.998204836416335,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 269.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 259.96940069356117,
   "end_elevation_m": 269.46850311176934,
   "min_gradient_pct": 2.417153610687933
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.116529680623273,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 219.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 252.35197343114606,
   "end_elevation_m": 269.46850311176934,
   "min_gradient_pct": 4.74468726399445
  }
 ],
 "shape": {
  "ascent_concentration": 0.348,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 94.0,
  "shape_class": "sustained"
 },
 "length_m": 342.6999999999358,
 "start_elevation_m": 229.70104793519994,
 "end_elevation_m": 271.79458838886643,
 "endpoint_gain_m": 42.09354045366649,
 "overall_gradient_pct": 12.282912300459403,
 "accumulated_ascent_m": 42.754193204075875,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 21.102381820986125,
   "start_distance_m": 160.0,
   "end_distance_m": 165.0,
   "midpoint_distance_m": 162.5,
   "start_elevation_m": 242.5066938373617,
   "end_elevation_m": 243.561812928411,
   "start_xy": [
    593409.2258799298,
    4449656.993448989
   ],
   "end_xy": [
    593407.372721237,
    4449652.349549944
   ]
  },
  "max_10m": {
   "gradient_pct": 21.029454917228918,
   "start_distance_m": 169.0,
   "end_distance_m": 179.0,
   "midpoint_distance_m": 174.0,
   "start_elevation_m": 244.3642563105472,
   "end_elevation_m": 246.4672018022701,
   "start_xy": [
    593405.8897452365,
    4449648.634610039
   ],
   "end_xy": [
    593402.1837712259,
    4449639.346675118
   ]
  },
  "max_20m": {
   "gradient_pct": 20.846826255291262,
   "start_distance_m": 160.0,
   "end_distance_m": 180.0,
   "midpoint_distance_m": 170.0,
   "start_elevation_m": 242.5066938373617,
   "end_elevation_m": 246.67605908841995,
   "start_xy": [
    593409.2258799298,
    4449656.993448989
   ],
   "end_xy": [
    593401.8128976722,
    4449638.417991745
   ]
  },
  "max_25m": {
   "gradient_pct": 20.689520132773055,
   "start_distance_m": 156.0,
   "end_distance_m": 181.0,
   "midpoint_distance_m": 168.5,
   "start_elevation_m": 241.70708645473752,
   "end_elevation_m": 246.87946648793078,
   "start_xy": [
    593410.7086843067,
    4449660.708457469
   ],
   "end_xy": [
    593401.4422841641,
    4449637.489204606
   ]
  },
  "max_50m": {
   "gradient_pct": 18.998204836416335,
   "start_distance_m": 269.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 294.0,
   "start_elevation_m": 259.96940069356117,
   "end_elevation_m": 269.46850311176934,
   "start_xy": [
    593372.0652853429,
    4449554.566141631
   ],
   "end_xy": [
    593353.0239292115,
    4449508.681885477
   ]
  },
  "max_100m": {
   "gradient_pct": 17.116529680623273,
   "start_distance_m": 219.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 269.0,
   "start_elevation_m": 252.35197343114606,
   "end_elevation_m": 269.46850311176934,
   "start_xy": [
    593388.3644010443,
    4449601.816808936
   ],
   "end_xy": [
    593353.0239292115,
    4449508.681885477
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.63988638114813,
   "start_distance_m": 19.0,
   "end_distance_m": 24.0,
   "midpoint_distance_m": 21.5,
   "start_elevation_m": 230.58674469482727,
   "end_elevation_m": 230.10475037576987,
   "start_xy": [
    593448.5553055744,
    4449792.172173055
   ],
   "end_xy": [
    593447.4137054447,
    4449787.304242972
   ]
  },
  "min_10m": {
   "gradient_pct": -6.553494536511266,
   "start_distance_m": 17.0,
   "end_distance_m": 27.0,
   "midpoint_distance_m": 22.0,
   "start_elevation_m": 230.68585249421548,
   "end_elevation_m": 230.03050304056435,
   "start_xy": [
    593449.0117406524,
    4449794.119393222
   ],
   "end_xy": [
    593446.7287612454,
    4449784.383481105
   ]
  },
  "min_20m": {
   "gradient_pct": -2.414541216630113,
   "start_distance_m": 14.0,
   "end_distance_m": 34.0,
   "midpoint_distance_m": 24.0,
   "start_elevation_m": 230.64849376285264,
   "end_elevation_m": 230.16558551952662,
   "start_xy": [
    593449.6967961182,
    4449797.040129031
   ],
   "end_xy": [
    593445.1402892214,
    4449777.566095602
   ]
  },
  "min_25m": {
   "gradient_pct": -0.9082818528893313,
   "start_distance_m": 13.0,
   "end_distance_m": 38.0,
   "midpoint_distance_m": 25.5,
   "start_elevation_m": 230.59427811223247,
   "end_elevation_m": 230.36720764901014,
   "start_xy": [
    593449.9247209153,
    4449798.01380777
   ],
   "end_xy": [
    593444.2321612303,
    4449773.670546425
   ]
  },
  "min_50m": {
   "gradient_pct": 2.417153610687933,
   "start_distance_m": 13.0,
   "end_distance_m": 63.0,
   "midpoint_distance_m": 38.0,
   "start_elevation_m": 230.59427811223247,
   "end_elevation_m": 231.80285491757644,
   "start_xy": [
    593449.9247209153,
    4449798.01380777
   ],
   "end_xy": [
    593438.5601465023,
    4449749.32248323
   ]
  },
  "min_100m": {
   "gradient_pct": 4.74468726399445,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 229.70104793519994,
   "end_elevation_m": 234.4457351991944,
   "start_xy": [
    593452.968417036,
    4449810.650235015
   ],
   "end_xy": [
    593429.3031265553,
    4449713.511194981
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.777324052037784,
   "start_distance_m": 316.0,
   "end_distance_m": 318.0,
   "midpoint_distance_m": 317.0,
   "start_elevation_m": 268.8029502656183,
   "end_elevation_m": 269.25849674665903,
   "start_xy": [
    593354.3088479297,
    4449511.353955164
   ],
   "end_xy": [
    593353.3216368669,
    4449509.614583881
   ]
  },
  "max_3m": {
   "gradient_pct": 22.18509487170195,
   "start_distance_m": 316.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 317.5,
   "start_elevation_m": 268.8029502656183,
   "end_elevation_m": 269.46850311176934,
   "start_xy": [
    593354.3088479297,
    4449511.353955164
   ],
   "end_xy": [
    593353.0239292115,
    4449508.681885477
   ]
  }
 },
 "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_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:26917",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/pa-west/USGS_1M_17_x59y445_PA_WesternPA_2019_D20.tif"
  ],
  "calculated_at": "2026-09-08T23:14:00+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_WesternPA_2019_D20 (collected 2020)",
  "elevation_tile_ids": [
   "x59y445"
  ],
  "route_base_cut_m": 60.5,
  "route_cut_m": 342.7,
  "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": "Monongahela",
  "county": "Pennsylvania"
 }
}