{
 "ocl_version": "0.1.0",
 "name": "Marsh Road",
 "slug": "marsh-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 13.721580062460248,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 4688.0,
   "end_distance_m": 4690.0,
   "start_elevation_m": 302.9262162258264,
   "end_elevation_m": 303.2006478270756,
   "min_gradient_pct": -10.449758427608913
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 13.407745580796396,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4417.0,
   "end_distance_m": 4420.0,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 274.10120527939256,
   "min_gradient_pct": -9.980839493901309
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 13.327045827597885,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4417.0,
   "end_distance_m": 4422.0,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 274.36532520334856,
   "min_gradient_pct": -9.843147852361653
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 13.045049025496951,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4429.0,
   "end_distance_m": 4439.0,
   "start_elevation_m": 275.23273417634573,
   "end_elevation_m": 276.5372390788954,
   "min_gradient_pct": -9.603094099174996
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 12.91463821154764,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4416.0,
   "end_distance_m": 4436.0,
   "start_elevation_m": 273.57190442264175,
   "end_elevation_m": 276.1548320649513,
   "min_gradient_pct": -9.449880239064328
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 12.863652582695977,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4417.0,
   "end_distance_m": 4442.0,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 276.91488605764266,
   "min_gradient_pct": -9.381189709442424
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 12.428194731597046,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4401.0,
   "end_distance_m": 4451.0,
   "start_elevation_m": 271.80078899103006,
   "end_elevation_m": 278.0148863568286,
   "min_gradient_pct": -9.029669991566948
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 11.897875702479212,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 4391.0,
   "end_distance_m": 4491.0,
   "start_elevation_m": 270.6526891412422,
   "end_elevation_m": 282.5505648437214,
   "min_gradient_pct": -8.326005178134949
  }
 ],
 "shape": {
  "ascent_concentration": 0.414,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 244.0,
  "shape_class": "sustained"
 },
 "length_m": 5200.82223631184,
 "start_elevation_m": 164.78459607319542,
 "end_elevation_m": 348.4353229107304,
 "endpoint_gain_m": 183.650726837535,
 "overall_gradient_pct": 3.531186387323455,
 "accumulated_ascent_m": 238.79350828223977,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 13.327045827597885,
   "start_distance_m": 4417.0,
   "end_distance_m": 4422.0,
   "midpoint_distance_m": 4419.5,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 274.36532520334856,
   "start_xy": [
    654743.5479075187,
    4622771.85879126
   ],
   "end_xy": [
    654738.7822821109,
    4622770.345909966
   ]
  },
  "max_10m": {
   "gradient_pct": 13.045049025496951,
   "start_distance_m": 4429.0,
   "end_distance_m": 4439.0,
   "midpoint_distance_m": 4434.0,
   "start_elevation_m": 275.23273417634573,
   "end_elevation_m": 276.5372390788954,
   "start_xy": [
    654732.0752601381,
    4622768.342302273
   ],
   "end_xy": [
    654722.4320084536,
    4622765.70618722
   ]
  },
  "max_20m": {
   "gradient_pct": 12.91463821154764,
   "start_distance_m": 4416.0,
   "end_distance_m": 4436.0,
   "midpoint_distance_m": 4426.0,
   "start_elevation_m": 273.57190442264175,
   "end_elevation_m": 276.1548320649513,
   "start_xy": [
    654744.5010490296,
    4622772.1613156935
   ],
   "end_xy": [
    654725.349188085,
    4622766.406230465
   ]
  },
  "max_25m": {
   "gradient_pct": 12.863652582695977,
   "start_distance_m": 4417.0,
   "end_distance_m": 4442.0,
   "midpoint_distance_m": 4429.5,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 276.91488605764266,
   "start_xy": [
    654743.5479075187,
    4622771.85879126
   ],
   "end_xy": [
    654719.5146822728,
    4622765.006754336
   ]
  },
  "max_50m": {
   "gradient_pct": 12.428194731597046,
   "start_distance_m": 4401.0,
   "end_distance_m": 4451.0,
   "midpoint_distance_m": 4426.0,
   "start_elevation_m": 271.80078899103006,
   "end_elevation_m": 278.0148863568286,
   "start_xy": [
    654758.7953837436,
    4622776.707755306
   ],
   "end_xy": [
    654710.7630080807,
    4622762.90718713
   ]
  },
  "max_100m": {
   "gradient_pct": 11.897875702479212,
   "start_distance_m": 4391.0,
   "end_distance_m": 4491.0,
   "midpoint_distance_m": 4441.0,
   "start_elevation_m": 270.6526891412422,
   "end_elevation_m": 282.5505648437214,
   "start_xy": [
    654768.1973118883,
    4622780.113720589
   ],
   "end_xy": [
    654671.4391119975,
    4622755.60996056
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -9.843147852361653,
   "start_distance_m": 3895.0,
   "end_distance_m": 3900.0,
   "midpoint_distance_m": 3897.5,
   "start_elevation_m": 268.3065381558041,
   "end_elevation_m": 267.814380763186,
   "start_xy": [
    655226.6006363432,
    4622674.920437646
   ],
   "end_xy": [
    655221.7620094725,
    4622676.180473229
   ]
  },
  "min_10m": {
   "gradient_pct": -9.603094099174996,
   "start_distance_m": 3894.0,
   "end_distance_m": 3904.0,
   "midpoint_distance_m": 3899.0,
   "start_elevation_m": 268.4020958480731,
   "end_elevation_m": 267.4417864381556,
   "start_xy": [
    655227.5685001813,
    4622674.66896328
   ],
   "end_xy": [
    655217.8839125624,
    4622677.159795862
   ]
  },
  "min_20m": {
   "gradient_pct": -9.449880239064328,
   "start_distance_m": 3895.0,
   "end_distance_m": 3915.0,
   "midpoint_distance_m": 3905.0,
   "start_elevation_m": 268.3065381558041,
   "end_elevation_m": 266.41656210799124,
   "start_xy": [
    655226.6006363432,
    4622674.920437646
   ],
   "end_xy": [
    655207.187163791,
    4622679.7248578565
   ]
  },
  "min_25m": {
   "gradient_pct": -9.381189709442424,
   "start_distance_m": 3891.0,
   "end_distance_m": 3916.0,
   "midpoint_distance_m": 3903.5,
   "start_elevation_m": 268.6731639607623,
   "end_elevation_m": 266.3278665334017,
   "start_xy": [
    655230.474003007,
    4622673.921940404
   ],
   "end_xy": [
    655206.2148009824,
    4622679.958332549
   ]
  },
  "min_50m": {
   "gradient_pct": -9.029669991566948,
   "start_distance_m": 3880.0,
   "end_distance_m": 3930.0,
   "midpoint_distance_m": 3905.0,
   "start_elevation_m": 269.623606261487,
   "end_elevation_m": 265.1087712657035,
   "start_xy": [
    655240.8473513696,
    4622670.338856354
   ],
   "end_xy": [
    655192.6008446178,
    4622683.223322055
   ]
  },
  "min_100m": {
   "gradient_pct": -8.326005178134949,
   "start_distance_m": 3866.0,
   "end_distance_m": 3966.0,
   "midpoint_distance_m": 3916.0,
   "start_elevation_m": 270.68970835978104,
   "end_elevation_m": 262.3637031816461,
   "start_xy": [
    655253.626211895,
    4622664.625585273
   ],
   "end_xy": [
    655158.2042233705,
    4622693.725847577
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 13.721580062460248,
   "start_distance_m": 4688.0,
   "end_distance_m": 4690.0,
   "midpoint_distance_m": 4689.0,
   "start_elevation_m": 302.9262162258264,
   "end_elevation_m": 303.2006478270756,
   "start_xy": [
    654477.1721175346,
    4622722.932961521
   ],
   "end_xy": [
    654475.2015761071,
    4622722.590957925
   ]
  },
  "max_3m": {
   "gradient_pct": 13.407745580796396,
   "start_distance_m": 4417.0,
   "end_distance_m": 4420.0,
   "midpoint_distance_m": 4418.5,
   "start_elevation_m": 273.69897291196867,
   "end_elevation_m": 274.10120527939256,
   "start_xy": [
    654743.5479075187,
    4622771.85879126
   ],
   "end_xy": [
    654740.68855336,
    4622770.950995923
   ]
  }
 },
 "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": 0.133,
   "obstruction_max_height_m": 29.13,
   "flagged_windows_m": [
    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/ct/USGS_1M_18_x65y463_CT_Statewide_C16.tif"
  ],
  "calculated_at": "2026-09-03T18:49:23+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/marsh-road/marsh-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, CT_Statewide_C16 (collected 2016)",
  "elevation_tile_ids": [
   "x65y463"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://usgs-lidar-public.s3-us-west-2.amazonaws.com/CT_Statewide_B5_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.993,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Litchfield",
  "county": "Connecticut"
 }
}