{
 "ocl_version": "0.1.0",
 "name": "Northwest 49th Street",
 "slug": "northwest-49th-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.66227282503459,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 755.0,
   "end_distance_m": 757.0,
   "start_elevation_m": 75.35653588016706,
   "end_elevation_m": 75.82978133666775,
   "min_gradient_pct": -1.4368312485066426
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.515941530904172,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 755.0,
   "end_distance_m": 758.0,
   "start_elevation_m": 75.35653588016706,
   "end_elevation_m": 76.06201412609418,
   "min_gradient_pct": -1.1903132127429217
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.388897537659545,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 753.0,
   "end_distance_m": 758.0,
   "start_elevation_m": 74.8925692492112,
   "end_elevation_m": 76.06201412609418,
   "min_gradient_pct": -1.1668940481935763
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.252568940412033,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 752.0,
   "end_distance_m": 762.0,
   "start_elevation_m": 74.66165662637913,
   "end_elevation_m": 76.98691352042033,
   "min_gradient_pct": -0.2870101776320233
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.639253657297388,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 693.0,
   "end_distance_m": 713.0,
   "start_elevation_m": 66.10883663716503,
   "end_elevation_m": 70.4366873686245,
   "min_gradient_pct": 0.04041620630050424
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.561258692789753,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 688.0,
   "end_distance_m": 713.0,
   "start_elevation_m": 65.04637269542707,
   "end_elevation_m": 70.4366873686245,
   "min_gradient_pct": 0.13449032438135333
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.452080822379283,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 663.0,
   "end_distance_m": 713.0,
   "start_elevation_m": 59.71064695743486,
   "end_elevation_m": 70.4366873686245,
   "min_gradient_pct": 0.3238963646511692
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 21.417260085713153,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 611.0,
   "end_distance_m": 711.0,
   "start_elevation_m": 48.58521149807903,
   "end_elevation_m": 70.00247158379219,
   "min_gradient_pct": 0.7719078772286937
  }
 ],
 "shape": {
  "ascent_concentration": 0.501,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 158.0,
  "shape_class": "stepped"
 },
 "length_m": 987.0551000720391,
 "start_elevation_m": 10.565046416205549,
 "end_elevation_m": 96.1998291740492,
 "endpoint_gain_m": 85.63478275784365,
 "overall_gradient_pct": 8.675785450234105,
 "accumulated_ascent_m": 85.8493552506676,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.388897537659545,
   "start_distance_m": 753.0,
   "end_distance_m": 758.0,
   "midpoint_distance_m": 755.5,
   "start_elevation_m": 74.8925692492112,
   "end_elevation_m": 76.06201412609418,
   "start_xy": [
    548154.3606646131,
    5279189.330549215
   ],
   "end_xy": [
    548159.3603826603,
    5279189.383647694
   ]
  },
  "max_10m": {
   "gradient_pct": 23.252568940412033,
   "start_distance_m": 752.0,
   "end_distance_m": 762.0,
   "midpoint_distance_m": 757.0,
   "start_elevation_m": 74.66165662637913,
   "end_elevation_m": 76.98691352042033,
   "start_xy": [
    548153.3607210037,
    5279189.319929519
   ],
   "end_xy": [
    548163.360157098,
    5279189.426126477
   ]
  },
  "max_20m": {
   "gradient_pct": 21.639253657297388,
   "start_distance_m": 693.0,
   "end_distance_m": 713.0,
   "midpoint_distance_m": 703.0,
   "start_elevation_m": 66.10883663716503,
   "end_elevation_m": 70.4366873686245,
   "start_xy": [
    548094.8294361663,
    5279188.927812463
   ],
   "end_xy": [
    548114.8285124905,
    5279189.120026356
   ]
  },
  "max_25m": {
   "gradient_pct": 21.561258692789753,
   "start_distance_m": 688.0,
   "end_distance_m": 713.0,
   "midpoint_distance_m": 700.5,
   "start_elevation_m": 65.04637269542707,
   "end_elevation_m": 70.4366873686245,
   "start_xy": [
    548089.8296670853,
    5279188.879758989
   ],
   "end_xy": [
    548114.8285124905,
    5279189.120026356
   ]
  },
  "max_50m": {
   "gradient_pct": 21.452080822379283,
   "start_distance_m": 663.0,
   "end_distance_m": 713.0,
   "midpoint_distance_m": 688.0,
   "start_elevation_m": 59.71064695743486,
   "end_elevation_m": 70.4366873686245,
   "start_xy": [
    548064.8308216801,
    5279188.639491623
   ],
   "end_xy": [
    548114.8285124905,
    5279189.120026356
   ]
  },
  "max_100m": {
   "gradient_pct": 21.417260085713153,
   "start_distance_m": 611.0,
   "end_distance_m": 711.0,
   "midpoint_distance_m": 661.0,
   "start_elevation_m": 48.58521149807903,
   "end_elevation_m": 70.00247158379219,
   "start_xy": [
    548012.8332232373,
    5279188.139735501
   ],
   "end_xy": [
    548112.8286048581,
    5279189.100804967
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -1.1668940481935763,
   "start_distance_m": 1.0,
   "end_distance_m": 6.0,
   "midpoint_distance_m": 3.5,
   "start_elevation_m": 10.564700287033565,
   "end_elevation_m": 10.506355584623886,
   "start_xy": [
    547404.1619974917,
    5279193.018239783
   ],
   "end_xy": [
    547409.1619849501,
    5279193.029438701
   ]
  },
  "min_10m": {
   "gradient_pct": -0.2870101776320233,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 10.565046416205549,
   "end_elevation_m": 10.536345398442347,
   "start_xy": [
    547403.162,
    5279193.016
   ],
   "end_xy": [
    547413.1619658291,
    5279193.041462752
   ]
  },
  "min_20m": {
   "gradient_pct": 0.04041620630050424,
   "start_distance_m": 185.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 195.0,
   "start_elevation_m": 13.122020042766328,
   "end_elevation_m": 13.13010328402643,
   "start_xy": [
    547588.1586405142,
    5279194.119275266
   ],
   "end_xy": [
    547608.1583339804,
    5279194.229132323
   ]
  },
  "min_25m": {
   "gradient_pct": 0.13449032438135333,
   "start_distance_m": 184.0,
   "end_distance_m": 209.0,
   "midpoint_distance_m": 196.5,
   "start_elevation_m": 13.124759897521457,
   "end_elevation_m": 13.158382478616796,
   "start_xy": [
    547587.1586588158,
    5279194.113225248
   ],
   "end_xy": [
    547612.1582734634,
    5279194.251135316
   ]
  },
  "min_50m": {
   "gradient_pct": 0.3238963646511692,
   "start_distance_m": 184.0,
   "end_distance_m": 234.0,
   "midpoint_distance_m": 209.0,
   "start_elevation_m": 13.124759897521457,
   "end_elevation_m": 13.286708079847042,
   "start_xy": [
    547587.1586588158,
    5279194.113225248
   ],
   "end_xy": [
    547637.1578952327,
    5279194.3886540225
   ]
  },
  "min_100m": {
   "gradient_pct": 0.7719078772286937,
   "start_distance_m": 155.0,
   "end_distance_m": 255.0,
   "midpoint_distance_m": 205.0,
   "start_elevation_m": 12.74180521287126,
   "end_elevation_m": 13.513713090099953,
   "start_xy": [
    547558.1592316289,
    5279193.93175565
   ],
   "end_xy": [
    547658.1575775188,
    5279194.504169737
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.66227282503459,
   "start_distance_m": 755.0,
   "end_distance_m": 757.0,
   "midpoint_distance_m": 756.0,
   "start_elevation_m": 75.35653588016706,
   "end_elevation_m": 75.82978133666775,
   "start_xy": [
    548156.360551832,
    5279189.3517886065
   ],
   "end_xy": [
    548158.3604390508,
    5279189.373027998
   ]
  },
  "max_3m": {
   "gradient_pct": 23.515941530904172,
   "start_distance_m": 755.0,
   "end_distance_m": 758.0,
   "midpoint_distance_m": 756.5,
   "start_elevation_m": 75.35653588016706,
   "end_elevation_m": 76.06201412609418,
   "start_xy": [
    548156.360551832,
    5279189.3517886065
   ],
   "end_xy": [
    548159.3603826603,
    5279189.383647694
   ]
  }
 },
 "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",
  "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": "sha256:51d6b86dd5308ae6"
  },
  "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": "2026-09-29T04:15:27+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": 5,
  "carriageway": {
   "stations": 46,
   "stations_resolved": 46,
   "width_median_m": 10.5,
   "width_p10_m": 8.75,
   "width_min_m": 8.0,
   "width_max_m": 12.0,
   "bounded_share": 0.0,
   "unbounded_share": 1.0,
   "confidence_median": 0.0,
   "window_m": [
    688.0,
    713.0
   ],
   "width_at_max25_m": 10.75,
   "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"
 }
}