{
 "ocl_version": "0.1.0",
 "name": "4th Avenue North",
 "slug": "4th-avenue-north-2",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 28.34423258951837,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 38.0,
   "end_distance_m": 40.0,
   "start_elevation_m": 23.774071557089314,
   "end_elevation_m": 24.340956208879682,
   "min_gradient_pct": -2.6111885673834934
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 27.373676849062416,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 83.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 35.085320865748926,
   "end_elevation_m": 35.9065311712208,
   "min_gradient_pct": -2.223941428797005
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.715706735604527,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 84.0,
   "end_distance_m": 89.0,
   "start_elevation_m": 35.34089206295471,
   "end_elevation_m": 36.676677399734935,
   "min_gradient_pct": -1.8164578970910839
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.53652892505612,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 76.0,
   "end_distance_m": 86.0,
   "start_elevation_m": 33.25287827871519,
   "end_elevation_m": 35.9065311712208,
   "min_gradient_pct": -0.23338419963302215
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 26.23768740996976,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 76.0,
   "end_distance_m": 96.0,
   "start_elevation_m": 33.25287827871519,
   "end_elevation_m": 38.50041576070914,
   "min_gradient_pct": 4.976583707775859
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 26.091145351963547,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 72.0,
   "end_distance_m": 97.0,
   "start_elevation_m": 32.22789215120022,
   "end_elevation_m": 38.75067848919111,
   "min_gradient_pct": 5.648028597226585
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 25.25675307513515,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 51.0,
   "end_distance_m": 101.0,
   "start_elevation_m": 27.136102062586154,
   "end_elevation_m": 39.76447860015373,
   "min_gradient_pct": 8.050451147887486
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 24.82497814853748,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 27.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 21.046133593951044,
   "end_elevation_m": 45.87111174248852,
   "min_gradient_pct": 8.413156420144503
  }
 ],
 "shape": {
  "ascent_concentration": 0.342,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 155.0,
  "shape_class": "sustained"
 },
 "length_m": 628.8683538806104,
 "start_elevation_m": 18.40875888703691,
 "end_elevation_m": 117.10781655028015,
 "endpoint_gain_m": 98.69905766324324,
 "overall_gradient_pct": 15.694708925038562,
 "accumulated_ascent_m": 98.7961879421351,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.715706735604527,
   "start_distance_m": 84.0,
   "end_distance_m": 89.0,
   "midpoint_distance_m": 86.5,
   "start_elevation_m": 35.34089206295471,
   "end_elevation_m": 36.676677399734935,
   "start_xy": [
    548851.4774122913,
    5277038.75240353
   ],
   "end_xy": [
    548851.5501209814,
    5277033.752932213
   ]
  },
  "max_10m": {
   "gradient_pct": 26.53652892505612,
   "start_distance_m": 76.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 81.0,
   "start_elevation_m": 33.25287827871519,
   "end_elevation_m": 35.9065311712208,
   "start_xy": [
    548851.3610783872,
    5277046.751557637
   ],
   "end_xy": [
    548851.5064957674,
    5277036.752615004
   ]
  },
  "max_20m": {
   "gradient_pct": 26.23768740996976,
   "start_distance_m": 76.0,
   "end_distance_m": 96.0,
   "midpoint_distance_m": 86.0,
   "start_elevation_m": 33.25287827871519,
   "end_elevation_m": 38.50041576070914,
   "start_xy": [
    548851.3610783872,
    5277046.751557637
   ],
   "end_xy": [
    548851.6519131475,
    5277026.75367237
   ]
  },
  "max_25m": {
   "gradient_pct": 26.091145351963547,
   "start_distance_m": 72.0,
   "end_distance_m": 97.0,
   "midpoint_distance_m": 84.5,
   "start_elevation_m": 32.22789215120022,
   "end_elevation_m": 38.75067848919111,
   "start_xy": [
    548851.3029114351,
    5277050.75113469
   ],
   "end_xy": [
    548851.6664548856,
    5277025.7537781065
   ]
  },
  "max_50m": {
   "gradient_pct": 25.25675307513515,
   "start_distance_m": 51.0,
   "end_distance_m": 101.0,
   "midpoint_distance_m": 76.0,
   "start_elevation_m": 27.136102062586154,
   "end_elevation_m": 39.76447860015373,
   "start_xy": [
    548850.8768707741,
    5277071.744003569
   ],
   "end_xy": [
    548851.7486390383,
    5277021.75546037
   ]
  },
  "max_100m": {
   "gradient_pct": 24.82497814853748,
   "start_distance_m": 27.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 77.0,
   "start_elevation_m": 21.046133593951044,
   "end_elevation_m": 45.87111174248852,
   "start_xy": [
    548850.925726388,
    5277095.743953842
   ],
   "end_xy": [
    548853.9156257856,
    5276995.8463808745
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.8164578970910839,
   "start_distance_m": 0.0,
   "end_distance_m": 5.0,
   "midpoint_distance_m": 2.5,
   "start_elevation_m": 18.40875888703691,
   "end_elevation_m": 18.317935992182356,
   "start_xy": [
    548862.876,
    5277117.64
   ],
   "end_xy": [
    548858.8240460586,
    5277114.710551373
   ]
  },
  "min_10m": {
   "gradient_pct": -0.23338419963302215,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 18.40875888703691,
   "end_elevation_m": 18.385420467073608,
   "start_xy": [
    548862.876,
    5277117.64
   ],
   "end_xy": [
    548854.9675143119,
    5277111.542322966
   ]
  },
  "min_20m": {
   "gradient_pct": 4.976583707775859,
   "start_distance_m": 534.0,
   "end_distance_m": 554.0,
   "midpoint_distance_m": 544.0,
   "start_elevation_m": 108.60508433418994,
   "end_elevation_m": 109.60040107574511,
   "start_xy": [
    548852.3190989597,
    5276589.635490801
   ],
   "end_xy": [
    548852.4115611688,
    5276569.636086139
   ]
  },
  "min_25m": {
   "gradient_pct": 5.648028597226585,
   "start_distance_m": 532.0,
   "end_distance_m": 557.0,
   "midpoint_distance_m": 544.5,
   "start_elevation_m": 108.4455683546135,
   "end_elevation_m": 109.85757550392015,
   "start_xy": [
    548852.287819872,
    5276591.635246171
   ],
   "end_xy": [
    548852.4073225295,
    5276566.636089133
   ]
  },
  "min_50m": {
   "gradient_pct": 8.050451147887486,
   "start_distance_m": 507.0,
   "end_distance_m": 557.0,
   "midpoint_distance_m": 532.0,
   "start_elevation_m": 105.8323499299764,
   "end_elevation_m": 109.85757550392015,
   "start_xy": [
    548851.8998156517,
    5276616.632235044
   ],
   "end_xy": [
    548852.4073225295,
    5276566.636089133
   ]
  },
  "min_100m": {
   "gradient_pct": 8.413156420144503,
   "start_distance_m": 455.0,
   "end_distance_m": 555.0,
   "midpoint_distance_m": 505.0,
   "start_elevation_m": 101.25793970964443,
   "end_elevation_m": 109.67109612978894,
   "start_xy": [
    548851.9751273157,
    5276668.631611147
   ],
   "end_xy": [
    548852.410148289,
    5276568.636087136
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 28.34423258951837,
   "start_distance_m": 38.0,
   "end_distance_m": 40.0,
   "midpoint_distance_m": 39.0,
   "start_elevation_m": 23.774071557089314,
   "end_elevation_m": 24.340956208879682,
   "start_xy": [
    548850.9033342316,
    5277084.743976633
   ],
   "end_xy": [
    548850.8992629305,
    5277082.743980777
   ]
  },
  "max_3m": {
   "gradient_pct": 27.373676849062416,
   "start_distance_m": 83.0,
   "end_distance_m": 86.0,
   "midpoint_distance_m": 84.5,
   "start_elevation_m": 35.085320865748926,
   "end_elevation_m": 35.9065311712208,
   "start_xy": [
    548851.4628705534,
    5277039.7522977935
   ],
   "end_xy": [
    548851.5064957674,
    5277036.752615004
   ]
  }
 },
 "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",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "df76949036663033d9910b89cee4f0cc7be92656",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "us-west-seattle",
   "road_pbf": "block-batch-us-west-seattle.osm.pbf",
   "region_key": "usa-wa",
   "crs": "EPSG:26910",
   "elevation_provider_key": "usa3dep",
   "authority": "usa-inventory",
   "registry_pbf": "washington-2026-09-29.osm.pbf",
   "tile_index_snapshot": "sha256:45438e9c42c47b98"
  },
  "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:26910",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/wa/USGS_1M_10_x54y528_WA_KingCounty_2021_B21.tif"
  ],
  "calculated_at": "2026-09-29T04:14:54+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-us-west-seattle.osm.pbf",
  "osm_snapshot": "",
  "run_id": "us-west-seattle",
  "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, WA_KingCounty_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x54y528"
  ],
  "climb_origin": "discovered",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "structure_own_ways": 4,
  "carriageway": {
   "stations": 32,
   "stations_resolved": 32,
   "width_median_m": 8.12,
   "width_p10_m": 6.53,
   "width_min_m": 3.25,
   "width_max_m": 12.0,
   "bounded_share": 0.0,
   "unbounded_share": 1.0,
   "confidence_median": 0.0,
   "window_m": [
    72.0,
    97.0
   ],
   "width_at_max25_m": 6.75,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "status": "unavailable \u2014 no DSM raster (surface model absent or point-cloud only, which cannot serve off-line samples)"
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Seattle",
  "county": "Washington"
 }
}