{
 "ocl_version": "0.1.0",
 "name": "Chase Road",
 "slug": "chase-road-ma",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 44.42878146417044,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 131.0,
   "end_distance_m": 133.0,
   "start_elevation_m": 98.28501159079855,
   "end_elevation_m": 99.17358722008196,
   "min_gradient_pct": -17.43688421891534
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 43.15941181728012,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 130.0,
   "end_distance_m": 133.0,
   "start_elevation_m": 97.87880486556355,
   "end_elevation_m": 99.17358722008196,
   "min_gradient_pct": -15.784773499876318
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 38.17747539539823,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 129.0,
   "end_distance_m": 134.0,
   "start_elevation_m": 97.56364190663987,
   "end_elevation_m": 99.47251567640978,
   "min_gradient_pct": -12.945127979347149
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 30.067855633256215,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 101.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 91.74666253273664,
   "end_elevation_m": 94.75344809606226,
   "min_gradient_pct": -11.254100453476212
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.422382644495926,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "start_elevation_m": 89.86897156716307,
   "end_elevation_m": 94.75344809606226,
   "min_gradient_pct": -7.529924175981648
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 23.281947691423458,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 92.0,
   "end_distance_m": 117.0,
   "start_elevation_m": 90.08477046660262,
   "end_elevation_m": 95.90525738945848,
   "min_gradient_pct": -6.464645198473363
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 21.65684178632617,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 85.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 88.82700743699279,
   "end_elevation_m": 99.65542833015587,
   "min_gradient_pct": -3.081258827928366
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.903315852333222,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 35.0,
   "end_distance_m": 135.0,
   "start_elevation_m": 83.75211247782265,
   "end_elevation_m": 99.65542833015587,
   "min_gradient_pct": 0.41902851145341913
  }
 ],
 "shape": {
  "ascent_concentration": 0.538,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 81.0,
  "shape_class": "stepped"
 },
 "length_m": 295.2926941308984,
 "start_elevation_m": 80.789811080105,
 "end_elevation_m": 102.74944160009578,
 "endpoint_gain_m": 21.95963051999078,
 "overall_gradient_pct": 7.436564112980202,
 "accumulated_ascent_m": 25.44642811888265,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 38.17747539539823,
   "start_distance_m": 129.0,
   "end_distance_m": 134.0,
   "midpoint_distance_m": 131.5,
   "start_elevation_m": 97.56364190663987,
   "end_elevation_m": 99.47251567640978,
   "start_xy": [
    704647.1738702626,
    4720020.456519214
   ],
   "end_xy": [
    704652.0941925553,
    4720021.345577515
   ]
  },
  "max_10m": {
   "gradient_pct": 30.067855633256215,
   "start_distance_m": 101.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 106.0,
   "start_elevation_m": 91.74666253273664,
   "end_elevation_m": 94.75344809606226,
   "start_xy": [
    704619.2867713566,
    4720019.166000229
   ],
   "end_xy": [
    704629.2867703565,
    4720019.164
   ]
  },
  "max_20m": {
   "gradient_pct": 24.422382644495926,
   "start_distance_m": 91.0,
   "end_distance_m": 111.0,
   "midpoint_distance_m": 101.0,
   "start_elevation_m": 89.86897156716307,
   "end_elevation_m": 94.75344809606226,
   "start_xy": [
    704609.2867728564,
    4720019.169
   ],
   "end_xy": [
    704629.2867703565,
    4720019.164
   ]
  },
  "max_25m": {
   "gradient_pct": 23.281947691423458,
   "start_distance_m": 92.0,
   "end_distance_m": 117.0,
   "midpoint_distance_m": 104.5,
   "start_elevation_m": 90.08477046660262,
   "end_elevation_m": 95.90525738945848,
   "start_xy": [
    704610.2867728564,
    4720019.169
   ],
   "end_xy": [
    704635.2867693565,
    4720019.162
   ]
  },
  "max_50m": {
   "gradient_pct": 21.65684178632617,
   "start_distance_m": 85.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 110.0,
   "start_elevation_m": 88.82700743699279,
   "end_elevation_m": 99.65542833015587,
   "start_xy": [
    704603.2867733565,
    4720019.170000226
   ],
   "end_xy": [
    704653.0782220765,
    4720021.523582855
   ]
  },
  "max_100m": {
   "gradient_pct": 15.903315852333222,
   "start_distance_m": 35.0,
   "end_distance_m": 135.0,
   "midpoint_distance_m": 85.0,
   "start_elevation_m": 83.75211247782265,
   "end_elevation_m": 99.65542833015587,
   "start_xy": [
    704554.2570046128,
    4720014.453001977
   ],
   "end_xy": [
    704653.0782220765,
    4720021.523582855
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -12.945127979347149,
   "start_distance_m": 145.0,
   "end_distance_m": 150.0,
   "midpoint_distance_m": 147.5,
   "start_elevation_m": 99.25801031298471,
   "end_elevation_m": 98.61075391401735,
   "start_xy": [
    704662.9188983322,
    4720023.301524292
   ],
   "end_xy": [
    704667.8392206246,
    4720024.190582593
   ]
  },
  "min_10m": {
   "gradient_pct": -11.254100453476212,
   "start_distance_m": 254.0,
   "end_distance_m": 264.0,
   "midpoint_distance_m": 259.0,
   "start_elevation_m": 101.74723691160176,
   "end_elevation_m": 100.62182686625414,
   "start_xy": [
    704769.4685625201,
    4720045.7290478945
   ],
   "end_xy": [
    704778.1432816355,
    4720050.703905715
   ]
  },
  "min_20m": {
   "gradient_pct": -7.529924175981648,
   "start_distance_m": 245.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 255.0,
   "start_elevation_m": 102.07681640113186,
   "end_elevation_m": 100.57083156593553,
   "start_xy": [
    704760.8708535614,
    4720043.186969349
   ],
   "end_xy": [
    704779.0104229058,
    4720051.201967955
   ]
  },
  "min_25m": {
   "gradient_pct": -6.464645198473363,
   "start_distance_m": 240.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 252.5,
   "start_elevation_m": 102.18699286555388,
   "end_elevation_m": 100.57083156593553,
   "start_xy": [
    704756.0229772124,
    4720041.963004554
   ],
   "end_xy": [
    704779.0104229058,
    4720051.201967955
   ]
  },
  "min_50m": {
   "gradient_pct": -3.081258827928366,
   "start_distance_m": 215.0,
   "end_distance_m": 265.0,
   "midpoint_distance_m": 240.0,
   "start_elevation_m": 102.11146097989972,
   "end_elevation_m": 100.57083156593553,
   "start_xy": [
    704731.7831851072,
    4720035.844805316
   ],
   "end_xy": [
    704779.0104229058,
    4720051.201967955
   ]
  },
  "min_100m": {
   "gradient_pct": 0.41902851145341913,
   "start_distance_m": 184.0,
   "end_distance_m": 284.0,
   "midpoint_distance_m": 234.0,
   "start_elevation_m": 101.84569726757178,
   "end_elevation_m": 102.2647257790252,
   "start_xy": [
    704701.2975104924,
    4720030.235635028
   ],
   "end_xy": [
    704795.4920629819,
    4720060.654768514
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 44.42878146417044,
   "start_distance_m": 131.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 132.0,
   "start_elevation_m": 98.28501159079855,
   "end_elevation_m": 99.17358722008196,
   "start_xy": [
    704649.1419293053,
    4720020.8125298945
   ],
   "end_xy": [
    704651.1101630338,
    4720021.167572175
   ]
  },
  "max_3m": {
   "gradient_pct": 43.15941181728012,
   "start_distance_m": 130.0,
   "end_distance_m": 133.0,
   "midpoint_distance_m": 131.5,
   "start_elevation_m": 97.87880486556355,
   "end_elevation_m": 99.17358722008196,
   "start_xy": [
    704648.157899784,
    4720020.634524554
   ],
   "end_xy": [
    704651.1101630338,
    4720021.167572175
   ]
  }
 },
 "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": {
  "review": [
   "short_window_divergence"
  ],
  "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/ma/USGS_1M_18_x70y472_MA_Western_B24.tif",
   "data/cache/usa/ma/USGS_1M_18_x70y473_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-03T14:01:15+00:00",
  "road_source": "/mnt/HC_Volume_106727764/site-corpus-fresh/us/chase-road-ma/chase-road-ma.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": [
   "x70y472",
   "x70y473"
  ],
  "climb_origin": "discovered",
  "canopy_check": "unavailable \u2014 EPT corridor failed: USGS_LPC_MA_ME_MA_QL2_UTM18_L1_2015_LAS_2018: no corridor points fetched; USGS_LPC_MA_NE_CMGP_Sandy_Z18_2013: no corridor points fetched",
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Gill",
  "county": "Massachusetts"
 }
}