{
 "ocl_version": "0.1.0",
 "name": "Cassie Street",
 "slug": "cassie-street",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.658483593264123,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 598.0,
   "end_distance_m": 600.0,
   "start_elevation_m": 261.8172751133872,
   "end_elevation_m": 262.2704447852525,
   "min_gradient_pct": -6.284228977767725
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.500895722142406,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 598.0,
   "end_distance_m": 601.0,
   "start_elevation_m": 261.8172751133872,
   "end_elevation_m": 262.4923019850515,
   "min_gradient_pct": -6.131475349919431
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.313789704139708,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 599.0,
   "end_distance_m": 604.0,
   "start_elevation_m": 262.03980183918645,
   "end_elevation_m": 263.15549132439344,
   "min_gradient_pct": -6.0398040646452955
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.18382707437172,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 594.0,
   "end_distance_m": 604.0,
   "start_elevation_m": 260.93710861695627,
   "end_elevation_m": 263.15549132439344,
   "min_gradient_pct": -5.840930106663791
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.672265372521338,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 591.0,
   "end_distance_m": 611.0,
   "start_elevation_m": 260.31218533913307,
   "end_elevation_m": 264.64663841363733,
   "min_gradient_pct": -5.759462819871715
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.44541791574261,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 589.0,
   "end_distance_m": 614.0,
   "start_elevation_m": 259.90499999457995,
   "end_elevation_m": 265.2663544735156,
   "min_gradient_pct": -5.614070356561342
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.019509611000785,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 577.0,
   "end_distance_m": 627.0,
   "start_elevation_m": 257.57163720682803,
   "end_elevation_m": 267.5813920123284,
   "min_gradient_pct": -4.89447661356337
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.508353824304265,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 577.0,
   "end_distance_m": 677.0,
   "start_elevation_m": 257.57163720682803,
   "end_elevation_m": 276.0799910311323,
   "min_gradient_pct": -3.359841079315572
  }
 ],
 "shape": {
  "ascent_concentration": 0.578,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 280.0,
  "shape_class": "stepped"
 },
 "length_m": 1865.9999999997087,
 "start_elevation_m": 234.38133752028924,
 "end_elevation_m": 313.11347598497935,
 "endpoint_gain_m": 78.73213846469011,
 "overall_gradient_pct": 4.219300024903665,
 "accumulated_ascent_m": 86.28303397935588,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.313789704139708,
   "start_distance_m": 599.0,
   "end_distance_m": 604.0,
   "midpoint_distance_m": 601.5,
   "start_elevation_m": 262.03980183918645,
   "end_elevation_m": 263.15549132439344,
   "start_xy": [
    700922.5852088353,
    4899430.001359455
   ],
   "end_xy": [
    700925.9351119546,
    4899426.289466892
   ]
  },
  "max_10m": {
   "gradient_pct": 22.18382707437172,
   "start_distance_m": 594.0,
   "end_distance_m": 604.0,
   "midpoint_distance_m": 599.0,
   "start_elevation_m": 260.93710861695627,
   "end_elevation_m": 263.15549132439344,
   "start_xy": [
    700919.2359074859,
    4899433.713794993
   ],
   "end_xy": [
    700925.9351119546,
    4899426.289466892
   ]
  },
  "max_20m": {
   "gradient_pct": 21.672265372521338,
   "start_distance_m": 591.0,
   "end_distance_m": 611.0,
   "midpoint_distance_m": 601.0,
   "start_elevation_m": 260.31218533913307,
   "end_elevation_m": 264.64663841363733,
   "start_xy": [
    700917.2258661464,
    4899435.940840775
   ],
   "end_xy": [
    700930.1635238507,
    4899420.746776534
   ]
  },
  "max_25m": {
   "gradient_pct": 21.44541791574261,
   "start_distance_m": 589.0,
   "end_distance_m": 614.0,
   "midpoint_distance_m": 601.5,
   "start_elevation_m": 259.90499999457995,
   "end_elevation_m": 265.2663544735156,
   "start_xy": [
    700915.886004439,
    4899437.425687621
   ],
   "end_xy": [
    700931.1725396132,
    4899417.93477406
   ]
  },
  "max_50m": {
   "gradient_pct": 20.019509611000785,
   "start_distance_m": 577.0,
   "end_distance_m": 627.0,
   "midpoint_distance_m": 602.0,
   "start_elevation_m": 257.57163720682803,
   "end_elevation_m": 267.5813920123284,
   "start_xy": [
    700907.9619404101,
    4899446.432996146
   ],
   "end_xy": [
    700930.8957612489,
    4899405.125264021
   ]
  },
  "max_100m": {
   "gradient_pct": 18.508353824304265,
   "start_distance_m": 577.0,
   "end_distance_m": 677.0,
   "midpoint_distance_m": 627.0,
   "start_elevation_m": 257.57163720682803,
   "end_elevation_m": 276.0799910311323,
   "start_xy": [
    700907.9619404101,
    4899446.432996146
   ],
   "end_xy": [
    700902.9015438128,
    4899363.919141471
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -6.0398040646452955,
   "start_distance_m": 1498.0,
   "end_distance_m": 1503.0,
   "midpoint_distance_m": 1500.5,
   "start_elevation_m": 309.08899002461067,
   "end_elevation_m": 308.7869998213784,
   "start_xy": [
    700811.3982671308,
    4898552.189870126
   ],
   "end_xy": [
    700810.7331906428,
    4898547.234300203
   ]
  },
  "min_10m": {
   "gradient_pct": -5.840930106663791,
   "start_distance_m": 1493.0,
   "end_distance_m": 1503.0,
   "midpoint_distance_m": 1498.0,
   "start_elevation_m": 309.3710928320448,
   "end_elevation_m": 308.7869998213784,
   "start_xy": [
    700812.0641940263,
    4898557.145325413
   ],
   "end_xy": [
    700810.7331906428,
    4898547.234300203
   ]
  },
  "min_20m": {
   "gradient_pct": -5.759462819871715,
   "start_distance_m": 1486.0,
   "end_distance_m": 1506.0,
   "midpoint_distance_m": 1496.0,
   "start_elevation_m": 309.7787688970454,
   "end_elevation_m": 308.62687633307104,
   "start_xy": [
    700812.9787523339,
    4898564.085184804
   ],
   "end_xy": [
    700810.334162431,
    4898544.260955877
   ]
  },
  "min_25m": {
   "gradient_pct": -5.614070356561342,
   "start_distance_m": 1485.0,
   "end_distance_m": 1510.0,
   "midpoint_distance_m": 1497.5,
   "start_elevation_m": 309.8288926593084,
   "end_elevation_m": 308.42537507016806,
   "start_xy": [
    700813.0892878874,
    4898565.079056001
   ],
   "end_xy": [
    700809.681567451,
    4898540.315108224
   ]
  },
  "min_50m": {
   "gradient_pct": -4.89447661356337,
   "start_distance_m": 1475.0,
   "end_distance_m": 1525.0,
   "midpoint_distance_m": 1500.0,
   "start_elevation_m": 310.2055886163339,
   "end_elevation_m": 307.7583503095522,
   "start_xy": [
    700814.1832853592,
    4898575.019033155
   ],
   "end_xy": [
    700807.0605268927,
    4898525.545879939
   ]
  },
  "min_100m": {
   "gradient_pct": -3.359841079315572,
   "start_distance_m": 1454.0,
   "end_distance_m": 1554.0,
   "midpoint_distance_m": 1504.0,
   "start_elevation_m": 310.65415754277217,
   "end_elevation_m": 307.2943164634566,
   "start_xy": [
    700816.4804170448,
    4898595.893014151
   ],
   "end_xy": [
    700801.9907279571,
    4898496.992505745
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.658483593264123,
   "start_distance_m": 598.0,
   "end_distance_m": 600.0,
   "midpoint_distance_m": 599.0,
   "start_elevation_m": 261.8172751133872,
   "end_elevation_m": 262.2704447852525,
   "start_xy": [
    700921.9155752403,
    4899430.744051079
   ],
   "end_xy": [
    700923.254941564,
    4899429.258757253
   ]
  },
  "max_3m": {
   "gradient_pct": 22.500895722142406,
   "start_distance_m": 598.0,
   "end_distance_m": 601.0,
   "midpoint_distance_m": 599.5,
   "start_elevation_m": 261.8172751133872,
   "end_elevation_m": 262.4923019850515,
   "start_xy": [
    700921.9155752403,
    4899430.744051079
   ],
   "end_xy": [
    700923.9250706456,
    4899428.516512702
   ]
  }
 },
 "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": 0.061,
   "obstruction_max_height_m": 25.79,
   "flagged_windows_m": []
  },
  "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x70y490_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-03T22:40:11+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/vermont-260821.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "extent-trim-v2-260903",
  "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, VT_Statewide_A23 (collected 2023)",
  "elevation_tile_ids": [
   "x70y490"
  ],
  "route_cut_m": 1866.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_2_A23",
   "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": "Barre",
  "county": "Vermont"
 }
}