{
 "ocl_version": "0.1.0",
 "name": "Apple Hill Road",
 "slug": "apple-hill-road-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.934261146702852,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 82.0,
   "end_distance_m": 84.0,
   "start_elevation_m": 410.8858348476631,
   "end_elevation_m": 411.38452007059715,
   "min_gradient_pct": 4.832022797182844
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.167477006844212,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 81.0,
   "end_distance_m": 84.0,
   "start_elevation_m": 410.6894957603918,
   "end_elevation_m": 411.38452007059715,
   "min_gradient_pct": 5.573996150508265
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.73295698189031,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 79.0,
   "end_distance_m": 84.0,
   "start_elevation_m": 410.24787222150263,
   "end_elevation_m": 411.38452007059715,
   "min_gradient_pct": 6.317542791114192
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.416599752876664,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 251.0,
   "end_distance_m": 261.0,
   "start_elevation_m": 436.9487200610302,
   "end_elevation_m": 439.09038003631787,
   "min_gradient_pct": 7.705163070334606
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.194329619517305,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 249.0,
   "end_distance_m": 269.0,
   "start_elevation_m": 436.5316226957162,
   "end_elevation_m": 440.77048861961964,
   "min_gradient_pct": 9.763801853695782
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.008596469623853,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 244.0,
   "end_distance_m": 269.0,
   "start_elevation_m": 435.5183395022137,
   "end_elevation_m": 440.77048861961964,
   "min_gradient_pct": 9.90508133160779
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.88214132817336,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 224.0,
   "end_distance_m": 274.0,
   "start_elevation_m": 431.80773515777037,
   "end_elevation_m": 441.74880582185705,
   "min_gradient_pct": 11.08952685722727
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.70938444889407,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 191.0,
   "end_distance_m": 291.0,
   "start_elevation_m": 426.136955611629,
   "end_elevation_m": 444.84634006052306,
   "min_gradient_pct": 13.307532558209402
  }
 ],
 "shape": {
  "ascent_concentration": 0.309,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 175.0,
  "shape_class": "sustained"
 },
 "length_m": 308.25881464163524,
 "start_elevation_m": 398.8804040014325,
 "end_elevation_m": 446.78912873632476,
 "endpoint_gain_m": 47.908724734892246,
 "overall_gradient_pct": 15.541720936865438,
 "accumulated_ascent_m": 47.908724734892246,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.73295698189031,
   "start_distance_m": 79.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 81.5,
   "start_elevation_m": 410.24787222150263,
   "end_elevation_m": 411.38452007059715,
   "start_xy": [
    712917.5761048011,
    4885450.8906331025
   ],
   "end_xy": [
    712913.9982396653,
    4885447.397943441
   ]
  },
  "max_10m": {
   "gradient_pct": 21.416599752876664,
   "start_distance_m": 251.0,
   "end_distance_m": 261.0,
   "midpoint_distance_m": 256.0,
   "start_elevation_m": 436.9487200610302,
   "end_elevation_m": 439.09038003631787,
   "start_xy": [
    712761.7223176304,
    4885461.204340549
   ],
   "end_xy": [
    712752.5295710459,
    4885457.268173602
   ]
  },
  "max_20m": {
   "gradient_pct": 21.194329619517305,
   "start_distance_m": 249.0,
   "end_distance_m": 269.0,
   "midpoint_distance_m": 259.0,
   "start_elevation_m": 436.5316226957162,
   "end_elevation_m": 440.77048861961964,
   "start_xy": [
    712763.5608669474,
    4885461.991573938
   ],
   "end_xy": [
    712744.5911853735,
    4885456.347902116
   ]
  },
  "max_25m": {
   "gradient_pct": 21.008596469623853,
   "start_distance_m": 244.0,
   "end_distance_m": 269.0,
   "midpoint_distance_m": 256.5,
   "start_elevation_m": 435.5183395022137,
   "end_elevation_m": 440.77048861961964,
   "start_xy": [
    712768.3129689667,
    4885463.483816075
   ],
   "end_xy": [
    712744.5911853735,
    4885456.347902116
   ]
  },
  "max_50m": {
   "gradient_pct": 19.88214132817336,
   "start_distance_m": 224.0,
   "end_distance_m": 274.0,
   "midpoint_distance_m": 249.0,
   "start_elevation_m": 431.80773515777037,
   "end_elevation_m": 441.74880582185705,
   "start_xy": [
    712787.9318461637,
    4885467.068650937
   ],
   "end_xy": [
    712739.7209619731,
    4885456.390710637
   ]
  },
  "max_100m": {
   "gradient_pct": 18.70938444889407,
   "start_distance_m": 191.0,
   "end_distance_m": 291.0,
   "midpoint_distance_m": 241.0,
   "start_elevation_m": 426.136955611629,
   "end_elevation_m": 444.84634006052306,
   "start_xy": [
    712820.9063149432,
    4885467.753755552
   ],
   "end_xy": [
    712724.8998059657,
    4885464.541271432
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": 6.317542791114192,
   "start_distance_m": 303.0,
   "end_distance_m": 308.0,
   "midpoint_distance_m": 305.5,
   "start_elevation_m": 446.4650015078448,
   "end_elevation_m": 446.7808786474005,
   "start_xy": [
    712716.1298311341,
    4885472.708299308
   ],
   "end_xy": [
    712712.6377598364,
    4885476.286767983
   ]
  },
  "min_10m": {
   "gradient_pct": 7.705163070334606,
   "start_distance_m": 298.0,
   "end_distance_m": 308.0,
   "midpoint_distance_m": 303.0,
   "start_elevation_m": 446.01036234036707,
   "end_elevation_m": 446.7808786474005,
   "start_xy": [
    712719.6219024318,
    4885469.129830634
   ],
   "end_xy": [
    712712.6377598364,
    4885476.286767983
   ]
  },
  "min_20m": {
   "gradient_pct": 9.763801853695782,
   "start_distance_m": 118.0,
   "end_distance_m": 138.0,
   "midpoint_distance_m": 128.0,
   "start_elevation_m": 415.97837831245266,
   "end_elevation_m": 417.9311386831918,
   "start_xy": [
    712884.4409015764,
    4885438.585233201
   ],
   "end_xy": [
    712869.526232851,
    4885451.508710616
   ]
  },
  "min_25m": {
   "gradient_pct": 9.90508133160779,
   "start_distance_m": 110.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 122.5,
   "start_elevation_m": 415.13380890230644,
   "end_elevation_m": 417.6100792352084,
   "start_xy": [
    712892.0085714569,
    4885435.990937038
   ],
   "end_xy": [
    712871.8678689323,
    4885449.633413183
   ]
  },
  "min_50m": {
   "gradient_pct": 11.08952685722727,
   "start_distance_m": 102.0,
   "end_distance_m": 152.0,
   "midpoint_distance_m": 127.0,
   "start_elevation_m": 414.16897905101183,
   "end_elevation_m": 419.71374247962547,
   "start_xy": [
    712899.9658573403,
    4885436.2454311885
   ],
   "end_xy": [
    712858.2738095273,
    4885459.786735914
   ]
  },
  "min_100m": {
   "gradient_pct": 13.307532558209402,
   "start_distance_m": 55.0,
   "end_distance_m": 155.0,
   "midpoint_distance_m": 105.0,
   "start_elevation_m": 406.80989309624204,
   "end_elevation_m": 420.11742565445144,
   "start_xy": [
    712934.4737557201,
    4885467.92276682
   ],
   "end_xy": [
    712855.6815356269,
    4885461.29674122
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.934261146702852,
   "start_distance_m": 82.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 83.0,
   "start_elevation_m": 410.8858348476631,
   "end_elevation_m": 411.38452007059715,
   "start_xy": [
    712915.4293857196,
    4885448.795019305
   ],
   "end_xy": [
    712913.9982396653,
    4885447.397943441
   ]
  },
  "max_3m": {
   "gradient_pct": 23.167477006844212,
   "start_distance_m": 81.0,
   "end_distance_m": 84.0,
   "midpoint_distance_m": 82.5,
   "start_elevation_m": 410.6894957603918,
   "end_elevation_m": 411.38452007059715,
   "start_xy": [
    712916.1449587467,
    4885449.493557238
   ],
   "end_xy": [
    712913.9982396653,
    4885447.397943441
   ]
  }
 },
 "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": 0.3,
   "obstruction_max_height_m": 21.96,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "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_x71y489_VT_Statewide_A23.tif"
  ],
  "calculated_at": "2026-09-04T21:22:56+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": "hunt-wave1-260905",
  "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": [
   "x71y489"
  ],
  "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"
 },
 "area": {
  "place": "Corinth",
  "county": "Vermont"
 }
}