{
 "ocl_version": "0.1.0",
 "name": "Sugarloaf Mountain Road",
 "slug": "sugarloaf-mountain-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 26.79196402146431,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1008.0,
   "end_distance_m": 1010.0,
   "start_elevation_m": 158.60135352675474,
   "end_elevation_m": 159.13719280718402,
   "min_gradient_pct": -5.973998720710938
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 26.327861642316936,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 973.0,
   "end_distance_m": 976.0,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 150.6571282719526,
   "min_gradient_pct": -5.640531109519505
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 26.13756549285256,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 974.0,
   "end_distance_m": 979.0,
   "start_elevation_m": 150.12714384435293,
   "end_elevation_m": 151.43402211899556,
   "min_gradient_pct": -5.324662783424401
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 25.698706309675572,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 973.0,
   "end_distance_m": 983.0,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 152.43716305365064,
   "min_gradient_pct": -5.118904257723784
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 25.166139184612746,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 973.0,
   "end_distance_m": 993.0,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 154.90052025960563,
   "min_gradient_pct": -4.856323418325843
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 25.052904391613424,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 972.0,
   "end_distance_m": 997.0,
   "start_elevation_m": 149.6290120938553,
   "end_elevation_m": 155.89223819175865,
   "min_gradient_pct": -4.720188904080146
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 24.958826724569803,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 966.0,
   "end_distance_m": 1016.0,
   "start_elevation_m": 148.1645496400008,
   "end_elevation_m": 160.64396300228572,
   "min_gradient_pct": -4.159521710988031
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 22.586574870023643,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 956.0,
   "end_distance_m": 1056.0,
   "start_elevation_m": 145.97254694327486,
   "end_elevation_m": 168.5591218132985,
   "min_gradient_pct": -1.1971747996371107
  }
 ],
 "shape": {
  "ascent_concentration": 0.407,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 267.0,
  "shape_class": "sustained"
 },
 "length_m": 1322.3248525382508,
 "start_elevation_m": 56.95314899195074,
 "end_elevation_m": 192.1336775972789,
 "endpoint_gain_m": 135.18052860532816,
 "overall_gradient_pct": 10.222943957065029,
 "accumulated_ascent_m": 138.10237447404478,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 26.13756549285256,
   "start_distance_m": 974.0,
   "end_distance_m": 979.0,
   "midpoint_distance_m": 976.5,
   "start_elevation_m": 150.12714384435293,
   "end_elevation_m": 151.43402211899556,
   "start_xy": [
    698085.9389169982,
    4705132.732234066
   ],
   "end_xy": [
    698081.0874291866,
    4705131.522661409
   ]
  },
  "max_10m": {
   "gradient_pct": 25.698706309675572,
   "start_distance_m": 973.0,
   "end_distance_m": 983.0,
   "midpoint_distance_m": 978.0,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 152.43716305365064,
   "start_xy": [
    698086.928465596,
    4705132.876179433
   ],
   "end_xy": [
    698077.2062389372,
    4705130.555003284
   ]
  },
  "max_20m": {
   "gradient_pct": 25.166139184612746,
   "start_distance_m": 973.0,
   "end_distance_m": 993.0,
   "midpoint_distance_m": 983.0,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 154.90052025960563,
   "start_xy": [
    698086.928465596,
    4705132.876179433
   ],
   "end_xy": [
    698068.9901089125,
    4705124.955019305
   ]
  },
  "max_25m": {
   "gradient_pct": 25.052904391613424,
   "start_distance_m": 972.0,
   "end_distance_m": 997.0,
   "midpoint_distance_m": 984.5,
   "start_elevation_m": 149.6290120938553,
   "end_elevation_m": 155.89223819175865,
   "start_xy": [
    698087.9181557564,
    4705133.019404384
   ],
   "end_xy": [
    698065.7494233947,
    4705122.610342627
   ]
  },
  "max_50m": {
   "gradient_pct": 24.958826724569803,
   "start_distance_m": 966.0,
   "end_distance_m": 1016.0,
   "midpoint_distance_m": 991.0,
   "start_elevation_m": 148.1645496400008,
   "end_elevation_m": 160.64396300228572,
   "start_xy": [
    698093.8562967186,
    4705133.878754088
   ],
   "end_xy": [
    698050.9113119708,
    4705110.815157087
   ]
  },
  "max_100m": {
   "gradient_pct": 22.586574870023643,
   "start_distance_m": 956.0,
   "end_distance_m": 1056.0,
   "midpoint_distance_m": 1006.0,
   "start_elevation_m": 145.97254694327486,
   "end_elevation_m": 168.5591218132985,
   "start_xy": [
    698103.4641778957,
    4705136.238049819
   ],
   "end_xy": [
    698022.6359491223,
    4705082.565582615
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.324662783424401,
   "start_distance_m": 1267.0,
   "end_distance_m": 1272.0,
   "midpoint_distance_m": 1269.5,
   "start_elevation_m": 194.38700614135325,
   "end_elevation_m": 194.12077300218203,
   "start_xy": [
    697971.0568727754,
    4704882.952739834
   ],
   "end_xy": [
    697973.6466366393,
    4704878.7967408355
   ]
  },
  "min_10m": {
   "gradient_pct": -5.118904257723784,
   "start_distance_m": 1300.0,
   "end_distance_m": 1310.0,
   "midpoint_distance_m": 1305.0,
   "start_elevation_m": 193.134139805164,
   "end_elevation_m": 192.62224937939163,
   "start_xy": [
    697989.6467073828,
    4704855.8912640195
   ],
   "end_xy": [
    697993.6436532573,
    4704846.746165213
   ]
  },
  "min_20m": {
   "gradient_pct": -4.856323418325843,
   "start_distance_m": 1294.0,
   "end_distance_m": 1314.0,
   "midpoint_distance_m": 1304.0,
   "start_elevation_m": 193.41325990656475,
   "end_elevation_m": 192.44199522289958,
   "start_xy": [
    697986.6993314008,
    4704861.111157757
   ],
   "end_xy": [
    697995.0346766891,
    4704842.995824721
   ]
  },
  "min_25m": {
   "gradient_pct": -4.720188904080146,
   "start_distance_m": 1294.0,
   "end_distance_m": 1319.0,
   "midpoint_distance_m": 1306.5,
   "start_elevation_m": 193.41325990656475,
   "end_elevation_m": 192.2332126805447,
   "start_xy": [
    697986.6993314008,
    4704861.111157757
   ],
   "end_xy": [
    697995.9288297853,
    4704838.080637967
   ]
  },
  "min_50m": {
   "gradient_pct": -4.159521710988031,
   "start_distance_m": 1265.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1290.0,
   "start_elevation_m": 194.4764550770732,
   "end_elevation_m": 192.3966942215792,
   "start_xy": [
    697970.6700759899,
    4704884.914980453
   ],
   "end_xy": [
    697995.2500986737,
    4704842.022632903
   ]
  },
  "min_100m": {
   "gradient_pct": -1.1971747996371107,
   "start_distance_m": 1222.0,
   "end_distance_m": 1322.0,
   "midpoint_distance_m": 1272.0,
   "start_elevation_m": 193.33760422411598,
   "end_elevation_m": 192.14042942447887,
   "start_xy": [
    697974.3077717649,
    4704927.403217833
   ],
   "end_xy": [
    697996.437878119,
    4704835.124141765
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 26.79196402146431,
   "start_distance_m": 1008.0,
   "end_distance_m": 1010.0,
   "midpoint_distance_m": 1009.0,
   "start_elevation_m": 158.60135352675474,
   "end_elevation_m": 159.13719280718402,
   "start_xy": [
    698056.7906881184,
    4705116.227470057
   ],
   "end_xy": [
    698055.2540050249,
    4705114.955328222
   ]
  },
  "max_3m": {
   "gradient_pct": 26.327861642316936,
   "start_distance_m": 973.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 974.5,
   "start_elevation_m": 149.86729242268308,
   "end_elevation_m": 150.6571282719526,
   "start_xy": [
    698086.928465596,
    4705132.876179433
   ],
   "end_xy": [
    698083.9983218736,
    4705132.248405004
   ]
  }
 },
 "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": 0.825,
   "obstruction_max_height_m": 31.4,
   "flagged_windows_m": [
    2,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "descends_at_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_x69y471_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:42:22+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/massachusetts-260822.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, MA_Western_B24 (collected 2023-24)",
  "elevation_tile_ids": [
   "x69y471"
  ],
  "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_QL1_UTM18_L1_2015_LAS_2018",
   "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": "Deerfield",
  "county": "Massachusetts"
 }
}