{
 "ocl_version": "0.1.0",
 "name": "Birch Grove Road",
 "slug": "birch-grove-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.09415189622257,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3881.0,
   "end_distance_m": 3883.0,
   "start_elevation_m": 449.41911483030947,
   "end_elevation_m": 449.8809978682339,
   "min_gradient_pct": -11.200583071436654
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.846842925216986,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3880.0,
   "end_distance_m": 3883.0,
   "start_elevation_m": 449.1955925804774,
   "end_elevation_m": 449.8809978682339,
   "min_gradient_pct": -9.58534099672761
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.502214745900346,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3879.0,
   "end_distance_m": 3884.0,
   "start_elevation_m": 448.9653749615028,
   "end_elevation_m": 450.0904856987978,
   "min_gradient_pct": -8.009198154197747
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 20.723398108194147,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3876.0,
   "end_distance_m": 3886.0,
   "start_elevation_m": 448.3863613811762,
   "end_elevation_m": 450.4587011919956,
   "min_gradient_pct": -5.358791366530795
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 19.16417724068225,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3867.0,
   "end_distance_m": 3887.0,
   "start_elevation_m": 446.7893863164486,
   "end_elevation_m": 450.62222176458505,
   "min_gradient_pct": -2.6852610950382427
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 18.52660127887293,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3863.0,
   "end_distance_m": 3888.0,
   "start_elevation_m": 446.1385176819948,
   "end_elevation_m": 450.77016800171305,
   "min_gradient_pct": -2.513907458988342
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.143725826860305,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3857.0,
   "end_distance_m": 3907.0,
   "start_elevation_m": 445.27750768133643,
   "end_elevation_m": 453.3493705947666,
   "min_gradient_pct": -0.6879598611461688
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.329694854475292,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 3827.0,
   "end_distance_m": 3927.0,
   "start_elevation_m": 442.7118902533555,
   "end_elevation_m": 455.04158510783077,
   "min_gradient_pct": 1.121617410090721
  }
 ],
 "shape": {
  "ascent_concentration": 0.309,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 68.0,
  "shape_class": "sustained"
 },
 "length_m": 4019.6612301247883,
 "start_elevation_m": 226.46098358276845,
 "end_elevation_m": 455.79186302123185,
 "endpoint_gain_m": 229.3308794384634,
 "overall_gradient_pct": 5.705229030739586,
 "accumulated_ascent_m": 231.3521637190645,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.502214745900346,
   "start_distance_m": 3879.0,
   "end_distance_m": 3884.0,
   "midpoint_distance_m": 3881.5,
   "start_elevation_m": 448.9653749615028,
   "end_elevation_m": 450.0904856987978,
   "start_xy": [
    633903.4588990891,
    4700940.078623918
   ],
   "end_xy": [
    633906.6815411833,
    4700943.901525589
   ]
  },
  "max_10m": {
   "gradient_pct": 20.723398108194147,
   "start_distance_m": 3876.0,
   "end_distance_m": 3886.0,
   "midpoint_distance_m": 3881.0,
   "start_elevation_m": 448.3863613811762,
   "end_elevation_m": 450.4587011919956,
   "start_xy": [
    633901.5257841263,
    4700937.7844873555
   ],
   "end_xy": [
    633907.9705081056,
    4700945.430761539
   ]
  },
  "max_20m": {
   "gradient_pct": 19.16417724068225,
   "start_distance_m": 3867.0,
   "end_distance_m": 3887.0,
   "midpoint_distance_m": 3877.0,
   "start_elevation_m": 446.7893863164486,
   "end_elevation_m": 450.62222176458505,
   "start_xy": [
    633897.6642986438,
    4700929.728186132
   ],
   "end_xy": [
    633908.6148171131,
    4700946.19552654
   ]
  },
  "max_25m": {
   "gradient_pct": 18.52660127887293,
   "start_distance_m": 3863.0,
   "end_distance_m": 3888.0,
   "midpoint_distance_m": 3875.5,
   "start_elevation_m": 446.1385176819948,
   "end_elevation_m": 450.77016800171305,
   "start_xy": [
    633896.1493002324,
    4700926.026190014
   ],
   "end_xy": [
    633909.2588296715,
    4700946.960541458
   ]
  },
  "max_50m": {
   "gradient_pct": 16.143725826860305,
   "start_distance_m": 3857.0,
   "end_distance_m": 3907.0,
   "midpoint_distance_m": 3882.0,
   "start_elevation_m": 445.27750768133643,
   "end_elevation_m": 453.3493705947666,
   "start_xy": [
    633893.87723069,
    4700920.473020103
   ],
   "end_xy": [
    633925.4142625232,
    4700954.993452344
   ]
  },
  "max_100m": {
   "gradient_pct": 12.329694854475292,
   "start_distance_m": 3827.0,
   "end_distance_m": 3927.0,
   "midpoint_distance_m": 3877.0,
   "start_elevation_m": 442.7118902533555,
   "end_elevation_m": 455.04158510783077,
   "start_xy": [
    633879.2747318884,
    4700894.339524643
   ],
   "end_xy": [
    633945.2264159609,
    4700956.651954425
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -8.009198154197747,
   "start_distance_m": 4011.0,
   "end_distance_m": 4016.0,
   "midpoint_distance_m": 4013.5,
   "start_elevation_m": 456.4316950893981,
   "end_elevation_m": 456.0312351816882,
   "start_xy": [
    634027.6094398791,
    4700952.454097585
   ],
   "end_xy": [
    634031.9929555535,
    4700954.8592564175
   ]
  },
  "min_10m": {
   "gradient_pct": -5.358791366530795,
   "start_distance_m": 4009.0,
   "end_distance_m": 4019.0,
   "midpoint_distance_m": 4014.0,
   "start_elevation_m": 456.39780590620484,
   "end_elevation_m": 455.86192676955176,
   "start_xy": [
    634025.8558694514,
    4700951.492333188
   ],
   "end_xy": [
    634034.6230798133,
    4700956.302324646
   ]
  },
  "min_20m": {
   "gradient_pct": -2.6852610950382427,
   "start_distance_m": 3999.0,
   "end_distance_m": 4019.0,
   "midpoint_distance_m": 4009.0,
   "start_elevation_m": 456.3989789885594,
   "end_elevation_m": 455.86192676955176,
   "start_xy": [
    634016.6054681808,
    4700948.702358413
   ],
   "end_xy": [
    634034.6230798133,
    4700956.302324646
   ]
  },
  "min_25m": {
   "gradient_pct": -2.513907458988342,
   "start_distance_m": 3994.0,
   "end_distance_m": 4019.0,
   "midpoint_distance_m": 4006.5,
   "start_elevation_m": 456.49040363429884,
   "end_elevation_m": 455.86192676955176,
   "start_xy": [
    634011.6173817845,
    4700949.047313598
   ],
   "end_xy": [
    634034.6230798133,
    4700956.302324646
   ]
  },
  "min_50m": {
   "gradient_pct": -0.6879598611461688,
   "start_distance_m": 3969.0,
   "end_distance_m": 4019.0,
   "midpoint_distance_m": 3994.0,
   "start_elevation_m": 456.20590670012484,
   "end_elevation_m": 455.86192676955176,
   "start_xy": [
    633986.676761014,
    4700950.769338166
   ],
   "end_xy": [
    634034.6230798133,
    4700956.302324646
   ]
  },
  "min_100m": {
   "gradient_pct": 1.121617410090721,
   "start_distance_m": 3208.0,
   "end_distance_m": 3308.0,
   "midpoint_distance_m": 3258.0,
   "start_elevation_m": 399.42127842528237,
   "end_elevation_m": 400.5428958353731,
   "start_xy": [
    633717.9488816203,
    4700692.9740493
   ],
   "end_xy": [
    633705.7628146275,
    4700792.226415888
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.09415189622257,
   "start_distance_m": 3881.0,
   "end_distance_m": 3883.0,
   "midpoint_distance_m": 3882.0,
   "start_elevation_m": 449.41911483030947,
   "end_elevation_m": 449.8809978682339,
   "start_xy": [
    633904.7478663352,
    4700941.607860062
   ],
   "end_xy": [
    633906.0369691355,
    4700943.136982018
   ]
  },
  "max_3m": {
   "gradient_pct": 22.846842925216986,
   "start_distance_m": 3880.0,
   "end_distance_m": 3883.0,
   "midpoint_distance_m": 3881.5,
   "start_elevation_m": 449.1955925804774,
   "end_elevation_m": 449.8809978682339,
   "start_xy": [
    633904.1033355532,
    4700940.843281702
   ],
   "end_xy": [
    633906.0369691355,
    4700943.136982018
   ]
  }
 },
 "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": 0.095,
   "obstruction_max_height_m": 24.61,
   "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:26918",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/ma/USGS_1M_18_x63y471_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-03T12:55:22+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/birch-grove-road/birch-grove-road.geojson",
  "run_id": "canopy-all-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_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x63y471"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/USGS_LPC_MA_ME_MA_QL2_UTM18_L1_2015_LAS_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.898,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "New Lebanon",
  "county": "New York"
 }
}