{
 "ocl_version": "0.1.0",
 "name": "Grow Road",
 "slug": "grow-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.68086501332425,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1806.0,
   "end_distance_m": 1808.0,
   "start_elevation_m": 353.21271689978516,
   "end_elevation_m": 353.74633420005165,
   "min_gradient_pct": -6.158829288705192
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.372729884502633,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1805.0,
   "end_distance_m": 1808.0,
   "start_elevation_m": 352.95515230351657,
   "end_elevation_m": 353.74633420005165,
   "min_gradient_pct": -5.994996570113169
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 24.933489950784633,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1803.0,
   "end_distance_m": 1808.0,
   "start_elevation_m": 352.4996597025124,
   "end_elevation_m": 353.74633420005165,
   "min_gradient_pct": -5.836179246950337
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.6331575611772,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1801.0,
   "end_distance_m": 1811.0,
   "start_elevation_m": 352.12308790436873,
   "end_elevation_m": 354.38640366048645,
   "min_gradient_pct": -5.660577659442083
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.145991177319843,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1790.0,
   "end_distance_m": 1810.0,
   "start_elevation_m": 349.9607362014207,
   "end_elevation_m": 354.18993443688464,
   "min_gradient_pct": -5.1372114800804525
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.631769766045863,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1787.0,
   "end_distance_m": 1812.0,
   "start_elevation_m": 349.4051871326795,
   "end_elevation_m": 354.56312957419095,
   "min_gradient_pct": -5.0260259427958545
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.563914775658304,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1764.0,
   "end_distance_m": 1814.0,
   "start_elevation_m": 345.58775313262,
   "end_elevation_m": 354.86971052044913,
   "min_gradient_pct": -4.321694179080623
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.511271695446453,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1716.0,
   "end_distance_m": 1816.0,
   "start_elevation_m": 339.60198815647254,
   "end_elevation_m": 355.113259851919,
   "min_gradient_pct": -3.7361812072808505
  }
 ],
 "shape": {
  "ascent_concentration": 0.396,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 127.0,
  "shape_class": "sustained"
 },
 "length_m": 1822.4700178023738,
 "start_elevation_m": 250.86884666379495,
 "end_elevation_m": 355.6904175471272,
 "endpoint_gain_m": 104.82157088333224,
 "overall_gradient_pct": 5.751621143799741,
 "accumulated_ascent_m": 111.7252811425669,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 24.933489950784633,
   "start_distance_m": 1803.0,
   "end_distance_m": 1808.0,
   "midpoint_distance_m": 1805.5,
   "start_elevation_m": 352.4996597025124,
   "end_elevation_m": 353.74633420005165,
   "start_xy": [
    685102.2993631817,
    4941217.466902825
   ],
   "end_xy": [
    685099.4608356621,
    4941213.351227467
   ]
  },
  "max_10m": {
   "gradient_pct": 22.6331575611772,
   "start_distance_m": 1801.0,
   "end_distance_m": 1811.0,
   "midpoint_distance_m": 1806.0,
   "start_elevation_m": 352.12308790436873,
   "end_elevation_m": 354.38640366048645,
   "start_xy": [
    685103.4395442286,
    4941219.110066597
   ],
   "end_xy": [
    685097.8982593546,
    4941210.790298869
   ]
  },
  "max_20m": {
   "gradient_pct": 21.145991177319843,
   "start_distance_m": 1790.0,
   "end_distance_m": 1810.0,
   "midpoint_distance_m": 1800.0,
   "start_elevation_m": 349.9607362014207,
   "end_elevation_m": 354.18993443688464,
   "start_xy": [
    685109.7105399866,
    4941228.14746734
   ],
   "end_xy": [
    685098.4191181238,
    4941211.643941735
   ]
  },
  "max_25m": {
   "gradient_pct": 20.631769766045863,
   "start_distance_m": 1787.0,
   "end_distance_m": 1812.0,
   "midpoint_distance_m": 1799.5,
   "start_elevation_m": 349.4051871326795,
   "end_elevation_m": 354.56312957419095,
   "start_xy": [
    685111.420811557,
    4941230.612212998
   ],
   "end_xy": [
    685097.3774005855,
    4941209.936656003
   ]
  },
  "max_50m": {
   "gradient_pct": 18.563914775658304,
   "start_distance_m": 1764.0,
   "end_distance_m": 1814.0,
   "midpoint_distance_m": 1789.0,
   "start_elevation_m": 345.58775313262,
   "end_elevation_m": 354.86971052044913,
   "start_xy": [
    685121.0173508923,
    4941251.279205877
   ],
   "end_xy": [
    685096.3356830472,
    4941208.229370272
   ]
  },
  "max_100m": {
   "gradient_pct": 15.511271695446453,
   "start_distance_m": 1716.0,
   "end_distance_m": 1816.0,
   "midpoint_distance_m": 1766.0,
   "start_elevation_m": 339.60198815647254,
   "end_elevation_m": 355.113259851919,
   "start_xy": [
    685123.1800373476,
    4941299.185076005
   ],
   "end_xy": [
    685095.2939655089,
    4941206.52208454
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.836179246950337,
   "start_distance_m": 167.0,
   "end_distance_m": 172.0,
   "midpoint_distance_m": 169.5,
   "start_elevation_m": 246.57254268377466,
   "end_elevation_m": 246.28073372142714,
   "start_xy": [
    683685.9698105518,
    4941645.534152197
   ],
   "end_xy": [
    683689.7147297256,
    4941642.234478544
   ]
  },
  "min_10m": {
   "gradient_pct": -5.660577659442083,
   "start_distance_m": 167.0,
   "end_distance_m": 177.0,
   "midpoint_distance_m": 172.0,
   "start_elevation_m": 246.57254268377466,
   "end_elevation_m": 246.00648491783045,
   "start_xy": [
    683685.9698105518,
    4941645.534152197
   ],
   "end_xy": [
    683693.8269005108,
    4941639.430348045
   ]
  },
  "min_20m": {
   "gradient_pct": -5.1372114800804525,
   "start_distance_m": 163.0,
   "end_distance_m": 183.0,
   "midpoint_distance_m": 173.0,
   "start_elevation_m": 246.7368102616517,
   "end_elevation_m": 245.7093679656356,
   "start_xy": [
    683683.2218294679,
    4941648.440799744
   ],
   "end_xy": [
    683699.2862726158,
    4941637.013285887
   ]
  },
  "min_25m": {
   "gradient_pct": -5.0260259427958545,
   "start_distance_m": 160.0,
   "end_distance_m": 185.0,
   "midpoint_distance_m": 172.5,
   "start_elevation_m": 246.87503223090835,
   "end_elevation_m": 245.61852574520938,
   "start_xy": [
    683681.237711961,
    4941650.689663316
   ],
   "end_xy": [
    683701.2053130018,
    4941636.450006209
   ]
  },
  "min_50m": {
   "gradient_pct": -4.321694179080623,
   "start_distance_m": 135.0,
   "end_distance_m": 185.0,
   "midpoint_distance_m": 160.0,
   "start_elevation_m": 247.7793728347497,
   "end_elevation_m": 245.61852574520938,
   "start_xy": [
    683664.7317699828,
    4941669.449078212
   ],
   "end_xy": [
    683701.2053130018,
    4941636.450006209
   ]
  },
  "min_100m": {
   "gradient_pct": -3.7361812072808505,
   "start_distance_m": 93.0,
   "end_distance_m": 193.0,
   "midpoint_distance_m": 143.0,
   "start_elevation_m": 249.09097971246936,
   "end_elevation_m": 245.3547985051885,
   "start_xy": [
    683635.2477040234,
    4941699.355105815
   ],
   "end_xy": [
    683709.1075787491,
    4941635.448507686
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.68086501332425,
   "start_distance_m": 1806.0,
   "end_distance_m": 1808.0,
   "midpoint_distance_m": 1807.0,
   "start_elevation_m": 353.21271689978516,
   "end_elevation_m": 353.74633420005165,
   "start_xy": [
    685100.5890916113,
    4941215.0021571675
   ],
   "end_xy": [
    685099.4608356621,
    4941213.351227467
   ]
  },
  "max_3m": {
   "gradient_pct": 26.372729884502633,
   "start_distance_m": 1805.0,
   "end_distance_m": 1808.0,
   "midpoint_distance_m": 1806.5,
   "start_elevation_m": 352.95515230351657,
   "end_elevation_m": 353.74633420005165,
   "start_xy": [
    685101.1591821348,
    4941215.823739054
   ],
   "end_xy": [
    685099.4608356621,
    4941213.351227467
   ]
  }
 },
 "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": 0.171,
   "obstruction_max_height_m": 24.49,
   "flagged_windows_m": []
  },
  "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/vt/USGS_1M_18_x68y495_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-08-24T21:18:19+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": "redo-vt-4-260824",
  "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": [
   "x68y495"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 10.6% over 200 m (Terrain 50), gain 105.2 m over 1822 m way. KEPT at seed extent: no ascending continuation (min_avg=2.0%). ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'.",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/VT_Statewide_1_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": "Johnson",
  "county": "Vermont"
 }
}