{
 "ocl_version": "0.1.0",
 "name": "Grassy Hill Road",
 "slug": "grassy-hill-road-2",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.151238933914442,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1289.0,
   "end_distance_m": 1291.0,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.16029215828473,
   "min_gradient_pct": -16.35231815781424
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.85848888107201,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1289.0,
   "end_distance_m": 1292.0,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.3830220460386,
   "min_gradient_pct": -15.770161497221125
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.754923534615727,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1289.0,
   "end_distance_m": 1294.0,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.83501355633723,
   "min_gradient_pct": -15.697965931399267
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.400224189643154,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1285.0,
   "end_distance_m": 1295.0,
   "start_elevation_m": 274.8091519622062,
   "end_elevation_m": 277.04917438117053,
   "min_gradient_pct": -15.408183176691068
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.89092244790146,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1277.0,
   "end_distance_m": 1297.0,
   "start_elevation_m": 273.1014461039516,
   "end_elevation_m": 277.4796305935319,
   "min_gradient_pct": -14.98344977654682
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.651614585588504,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1273.0,
   "end_distance_m": 1298.0,
   "start_elevation_m": 272.2743635911844,
   "end_elevation_m": 277.6872672375815,
   "min_gradient_pct": -14.727483913791275
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.225514480821516,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1259.0,
   "end_distance_m": 1309.0,
   "start_elevation_m": 269.5939421014977,
   "end_elevation_m": 279.70669934190846,
   "min_gradient_pct": -13.030688005540469
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 17.42034906242401,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1230.0,
   "end_distance_m": 1330.0,
   "start_elevation_m": 265.37755778515356,
   "end_elevation_m": 282.79790684757756,
   "min_gradient_pct": -10.588751820927541
  }
 ],
 "shape": {
  "ascent_concentration": 0.306,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 149.0,
  "shape_class": "sustained"
 },
 "length_m": 1509.2195761439054,
 "start_elevation_m": 192.2465107736791,
 "end_elevation_m": 292.7888475147755,
 "endpoint_gain_m": 100.54233674109642,
 "overall_gradient_pct": 6.661876000706581,
 "accumulated_ascent_m": 115.62562287732655,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.754923534615727,
   "start_distance_m": 1289.0,
   "end_distance_m": 1294.0,
   "midpoint_distance_m": 1291.5,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.83501355633723,
   "start_xy": [
    644926.233326734,
    4601234.247057583
   ],
   "end_xy": [
    644931.0883183462,
    4601233.057536331
   ]
  },
  "max_10m": {
   "gradient_pct": 22.400224189643154,
   "start_distance_m": 1285.0,
   "end_distance_m": 1295.0,
   "midpoint_distance_m": 1290.0,
   "start_elevation_m": 274.8091519622062,
   "end_elevation_m": 277.04917438117053,
   "start_xy": [
    644922.3684357702,
    4601235.277705482
   ],
   "end_xy": [
    644932.0688946387,
    4601232.861398324
   ]
  },
  "max_20m": {
   "gradient_pct": 21.89092244790146,
   "start_distance_m": 1277.0,
   "end_distance_m": 1297.0,
   "midpoint_distance_m": 1287.0,
   "start_elevation_m": 273.1014461039516,
   "end_elevation_m": 277.4796305935319,
   "start_xy": [
    644914.6714172616,
    4601237.45850321
   ],
   "end_xy": [
    644934.029939369,
    4601232.468584637
   ]
  },
  "max_25m": {
   "gradient_pct": 21.651614585588504,
   "start_distance_m": 1273.0,
   "end_distance_m": 1298.0,
   "midpoint_distance_m": 1285.5,
   "start_elevation_m": 272.2743635911844,
   "end_elevation_m": 277.6872672375815,
   "start_xy": [
    644910.8227685124,
    4601238.548411419
   ],
   "end_xy": [
    644935.0103336357,
    4601232.271538845
   ]
  },
  "max_50m": {
   "gradient_pct": 20.225514480821516,
   "start_distance_m": 1259.0,
   "end_distance_m": 1309.0,
   "midpoint_distance_m": 1284.0,
   "start_elevation_m": 269.5939421014977,
   "end_elevation_m": 279.70669934190846,
   "start_xy": [
    644897.3526098634,
    4601242.363484026
   ],
   "end_xy": [
    644945.9286343484,
    4601231.053307188
   ]
  },
  "max_100m": {
   "gradient_pct": 17.42034906242401,
   "start_distance_m": 1230.0,
   "end_distance_m": 1330.0,
   "midpoint_distance_m": 1280.0,
   "start_elevation_m": 265.37755778515356,
   "end_elevation_m": 282.79790684757756,
   "start_xy": [
    644869.702616053,
    4601251.102793176
   ],
   "end_xy": [
    644966.9011483672,
    4601231.1304966295
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -15.697965931399267,
   "start_distance_m": 1126.0,
   "end_distance_m": 1131.0,
   "midpoint_distance_m": 1128.5,
   "start_elevation_m": 265.8070411616759,
   "end_elevation_m": 265.02214286510593,
   "start_xy": [
    644768.5259074845,
    4601261.432826772
   ],
   "end_xy": [
    644773.4771797687,
    4601262.128248552
   ]
  },
  "min_10m": {
   "gradient_pct": -15.408183176691068,
   "start_distance_m": 1122.0,
   "end_distance_m": 1132.0,
   "midpoint_distance_m": 1127.0,
   "start_elevation_m": 266.4169027010147,
   "end_elevation_m": 264.8760843833456,
   "start_xy": [
    644764.558419581,
    4601260.923870249
   ],
   "end_xy": [
    644774.4666260317,
    4601262.273148784
   ]
  },
  "min_20m": {
   "gradient_pct": -14.98344977654682,
   "start_distance_m": 1122.0,
   "end_distance_m": 1142.0,
   "midpoint_distance_m": 1132.0,
   "start_elevation_m": 266.4169027010147,
   "end_elevation_m": 263.4202127457053,
   "start_xy": [
    644764.558419581,
    4601260.923870249
   ],
   "end_xy": [
    644784.3616687354,
    4601263.7181769125
   ]
  },
  "min_25m": {
   "gradient_pct": -14.727483913791275,
   "start_distance_m": 1118.0,
   "end_distance_m": 1143.0,
   "midpoint_distance_m": 1130.5,
   "start_elevation_m": 266.96329907888,
   "end_elevation_m": 263.2814281004322,
   "start_xy": [
    644760.590945019,
    4601260.414809493
   ],
   "end_xy": [
    644785.3510949677,
    4601263.863213814
   ]
  },
  "min_50m": {
   "gradient_pct": -13.030688005540469,
   "start_distance_m": 1099.0,
   "end_distance_m": 1149.0,
   "midpoint_distance_m": 1124.0,
   "start_elevation_m": 269.11392789666513,
   "end_elevation_m": 262.5985838938949,
   "start_xy": [
    644741.7455678199,
    4601257.995785752
   ],
   "end_xy": [
    644791.2881193063,
    4601264.730239697
   ]
  },
  "min_100m": {
   "gradient_pct": -10.588751820927541,
   "start_distance_m": 1057.0,
   "end_distance_m": 1157.0,
   "midpoint_distance_m": 1107.0,
   "start_elevation_m": 272.5157837210721,
   "end_elevation_m": 261.9270319001446,
   "start_xy": [
    644700.0685114653,
    4601252.885053859
   ],
   "end_xy": [
    644799.2106857386,
    4601265.838754439
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.151238933914442,
   "start_distance_m": 1289.0,
   "end_distance_m": 1291.0,
   "midpoint_distance_m": 1290.0,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.16029215828473,
   "start_xy": [
    644926.233326734,
    4601234.247057583
   ],
   "end_xy": [
    644928.1672165055,
    4601233.737086651
   ]
  },
  "max_3m": {
   "gradient_pct": 22.85848888107201,
   "start_distance_m": 1289.0,
   "end_distance_m": 1292.0,
   "midpoint_distance_m": 1290.5,
   "start_elevation_m": 275.69726737960644,
   "end_elevation_m": 276.3830220460386,
   "start_xy": [
    644926.233326734,
    4601234.247057583
   ],
   "end_xy": [
    644929.1343347258,
    4601233.482795625
   ]
  }
 },
 "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": 0.269,
   "obstruction_max_height_m": 21.83,
   "flagged_windows_m": [
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier"
  ]
 },
 "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/ct/USGS_1M_18_x64y461_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-03T17:09:33+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/grassy-hill-road-2/grassy-hill-road-2.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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x64y461"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/CT_Statewide_B3_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.999,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Roxbury",
  "county": "Connecticut"
 }
}