{
 "ocl_version": "0.1.0",
 "name": "Bowker Street",
 "slug": "bowker-street",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.59361312612478,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 63.630578360521284,
   "end_elevation_m": 64.10245062304378,
   "min_gradient_pct": -2.8302285652682
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.40076230876491,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 108.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 63.40042775378083,
   "end_elevation_m": 64.10245062304378,
   "min_gradient_pct": -2.627850647621699
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 23.249226995503136,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 108.0,
   "end_distance_m": 113.0,
   "start_elevation_m": 63.40042775378083,
   "end_elevation_m": 64.56288910355599,
   "min_gradient_pct": -2.4030302760316147
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.000883903018092,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 107.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 63.16977938521234,
   "end_elevation_m": 65.46986777551415,
   "min_gradient_pct": -0.3080867417775579
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.872971341039303,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 107.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 63.16977938521234,
   "end_elevation_m": 67.7443736534202,
   "min_gradient_pct": 1.3666022888396157
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.71710647737149,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 104.0,
   "end_distance_m": 129.0,
   "start_elevation_m": 62.51333415338152,
   "end_elevation_m": 68.1926107727244,
   "min_gradient_pct": 1.4873951369208953
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.5332515348355,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 89.0,
   "end_distance_m": 139.0,
   "start_elevation_m": 59.46624548213737,
   "end_elevation_m": 70.23287124955512,
   "min_gradient_pct": 2.2668116208019597
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.25242852861993,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 73.0,
   "end_distance_m": 173.0,
   "start_elevation_m": 56.986191804757055,
   "end_elevation_m": 75.23862033337699,
   "min_gradient_pct": 5.349787452940689
  }
 ],
 "shape": {
  "ascent_concentration": 0.485,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 148.0,
  "shape_class": "stepped"
 },
 "length_m": 344.2482364804154,
 "start_elevation_m": 53.671386303069795,
 "end_elevation_m": 87.20667502670514,
 "endpoint_gain_m": 33.53528872363535,
 "overall_gradient_pct": 9.741600731640407,
 "accumulated_ascent_m": 33.71039779177015,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 23.249226995503136,
   "start_distance_m": 108.0,
   "end_distance_m": 113.0,
   "midpoint_distance_m": 110.5,
   "start_elevation_m": 63.40042775378083,
   "end_elevation_m": 64.56288910355599,
   "start_xy": [
    319196.5957738645,
    4699359.450531614
   ],
   "end_xy": [
    319194.42311958014,
    4699354.947247682
   ]
  },
  "max_10m": {
   "gradient_pct": 23.000883903018092,
   "start_distance_m": 107.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 112.0,
   "start_elevation_m": 63.16977938521234,
   "end_elevation_m": 65.46986777551415,
   "start_xy": [
    319197.0301313984,
    4699360.35127216
   ],
   "end_xy": [
    319192.68485064973,
    4699351.344690656
   ]
  },
  "max_20m": {
   "gradient_pct": 22.872971341039303,
   "start_distance_m": 107.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 117.0,
   "start_elevation_m": 63.16977938521234,
   "end_elevation_m": 67.7443736534202,
   "start_xy": [
    319197.0301313984,
    4699360.35127216
   ],
   "end_xy": [
    319188.3391501373,
    4699342.338311691
   ]
  },
  "max_25m": {
   "gradient_pct": 22.71710647737149,
   "start_distance_m": 104.0,
   "end_distance_m": 129.0,
   "midpoint_distance_m": 116.5,
   "start_elevation_m": 62.51333415338152,
   "end_elevation_m": 68.1926107727244,
   "start_xy": [
    319198.3340427948,
    4699363.05308864
   ],
   "end_xy": [
    319187.47001600824,
    4699340.537033233
   ]
  },
  "max_50m": {
   "gradient_pct": 21.5332515348355,
   "start_distance_m": 89.0,
   "end_distance_m": 139.0,
   "midpoint_distance_m": 114.0,
   "start_elevation_m": 59.46624548213737,
   "end_elevation_m": 70.23287124955512,
   "start_xy": [
    319204.8527889734,
    4699376.562562908
   ],
   "end_xy": [
    319183.12392431416,
    4699331.530843235
   ]
  },
  "max_100m": {
   "gradient_pct": 18.25242852861993,
   "start_distance_m": 73.0,
   "end_distance_m": 173.0,
   "midpoint_distance_m": 123.0,
   "start_elevation_m": 56.986191804757055,
   "end_elevation_m": 75.23862033337699,
   "start_xy": [
    319211.80589271587,
    4699390.972777274
   ],
   "end_xy": [
    319168.37193983677,
    4699300.897875099
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.4030302760316147,
   "start_distance_m": 2.0,
   "end_distance_m": 7.0,
   "midpoint_distance_m": 4.5,
   "start_elevation_m": 53.63742173540502,
   "end_elevation_m": 53.51727022160344,
   "start_xy": [
    319242.583962845,
    4699454.953918528
   ],
   "end_xy": [
    319240.48786148604,
    4699450.41471244
   ]
  },
  "min_10m": {
   "gradient_pct": -0.3080867417775579,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 53.671386303069795,
   "end_elevation_m": 53.64057762889204,
   "start_xy": [
    319243.413,
    4699456.774
   ],
   "end_xy": [
    319239.18476080534,
    4699447.712504565
   ]
  },
  "min_20m": {
   "gradient_pct": 1.3666022888396157,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 53.671386303069795,
   "end_elevation_m": 53.94470676083772,
   "start_xy": [
    319243.413,
    4699456.774
   ],
   "end_xy": [
    319234.83906046086,
    4699438.706125519
   ]
  },
  "min_25m": {
   "gradient_pct": 1.4873951369208953,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 53.671386303069795,
   "end_elevation_m": 54.04323508730002,
   "start_xy": [
    319243.413,
    4699456.774
   ],
   "end_xy": [
    319232.66601476975,
    4699434.203030663
   ]
  },
  "min_50m": {
   "gradient_pct": 2.2668116208019597,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 53.671386303069795,
   "end_elevation_m": 54.804792113470775,
   "start_xy": [
    319243.413,
    4699456.774
   ],
   "end_xy": [
    319221.8011765547,
    4699411.687365691
   ]
  },
  "min_100m": {
   "gradient_pct": 5.349787452940689,
   "start_distance_m": 229.0,
   "end_distance_m": 329.0,
   "midpoint_distance_m": 279.0,
   "start_elevation_m": 80.99174690683103,
   "end_elevation_m": 86.34153435977171,
   "start_xy": [
    319144.07877782354,
    4699250.441538753
   ],
   "end_xy": [
    319079.2169662517,
    4699215.977271983
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.59361312612478,
   "start_distance_m": 109.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 63.630578360521284,
   "end_elevation_m": 64.10245062304378,
   "start_xy": [
    319196.160996854,
    4699358.549993468
   ],
   "end_xy": [
    319195.2918627246,
    4699356.748715011
   ]
  },
  "max_3m": {
   "gradient_pct": 23.40076230876491,
   "start_distance_m": 108.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 109.5,
   "start_elevation_m": 63.40042775378083,
   "end_elevation_m": 64.10245062304378,
   "start_xy": [
    319196.5957738645,
    4699359.450531614
   ],
   "end_xy": [
    319195.2918627246,
    4699356.748715011
   ]
  }
 },
 "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": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.142,
   "obstruction_max_height_m": 22.13,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": []
 },
 "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ma-east/USGS_1M_19_x31y470_MA_CentralEastern_2021_B21.tif"
  ],
  "calculated_at": "2026-09-03T22:35:49+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "canopy-tail-260903",
  "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, MA_CentralEastern_2021_B21 (collected 2021)",
  "elevation_tile_ids": [
   "x31y470"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/MA_CentralEastern_1_2021",
   "ept_crs": "EPSG:3857",
   "station_coverage": 1.0,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Lexington",
  "county": "Massachusetts"
 }
}