{
 "ocl_version": "0.1.0",
 "name": "Cone Road",
 "slug": "cone-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 29.682840521513754,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1014.0,
   "end_distance_m": 1016.0,
   "start_elevation_m": 376.5014755182466,
   "end_elevation_m": 377.09513232867687,
   "min_gradient_pct": -21.390177446932057
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 28.581409207481556,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1014.0,
   "end_distance_m": 1017.0,
   "start_elevation_m": 376.5014755182466,
   "end_elevation_m": 377.35891779447104,
   "min_gradient_pct": -21.346687186765696
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 25.019877750303294,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1013.0,
   "end_distance_m": 1018.0,
   "start_elevation_m": 376.289656931967,
   "end_elevation_m": 377.54065081948215,
   "min_gradient_pct": -20.051625942753617
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.443694507890655,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 966.0,
   "end_distance_m": 976.0,
   "start_elevation_m": 367.68785710836096,
   "end_elevation_m": 369.93222655915,
   "min_gradient_pct": -18.404272128618118
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.02360217825975,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 956.0,
   "end_distance_m": 976.0,
   "start_elevation_m": 365.7275061234981,
   "end_elevation_m": 369.93222655915,
   "min_gradient_pct": -15.738882336314077
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.48824050927874,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 951.0,
   "end_distance_m": 976.0,
   "start_elevation_m": 364.81016643183034,
   "end_elevation_m": 369.93222655915,
   "min_gradient_pct": -14.723805483336264
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 19.39137201240112,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1052.0,
   "end_distance_m": 1102.0,
   "start_elevation_m": 382.66911796143154,
   "end_elevation_m": 392.3648039676321,
   "min_gradient_pct": -11.338795966122916
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.0168599667781,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1005.0,
   "end_distance_m": 1105.0,
   "start_elevation_m": 374.8422996061032,
   "end_elevation_m": 392.8591595728813,
   "min_gradient_pct": -7.462222819543513
  }
 ],
 "shape": {
  "ascent_concentration": 0.433,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 451.0,
  "shape_class": "sustained"
 },
 "length_m": 3287.99999999981,
 "start_elevation_m": 287.17437351097794,
 "end_elevation_m": 528.5731723783834,
 "endpoint_gain_m": 241.3987988674055,
 "overall_gradient_pct": 7.341812617622246,
 "accumulated_ascent_m": 256.66163641425777,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 25.019877750303294,
   "start_distance_m": 1013.0,
   "end_distance_m": 1018.0,
   "midpoint_distance_m": 1015.5,
   "start_elevation_m": 376.289656931967,
   "end_elevation_m": 377.54065081948215,
   "start_xy": [
    666495.0115816751,
    4693105.508349824
   ],
   "end_xy": [
    666490.0458972813,
    4693104.923560545
   ]
  },
  "max_10m": {
   "gradient_pct": 22.443694507890655,
   "start_distance_m": 966.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 971.0,
   "start_elevation_m": 367.68785710836096,
   "end_elevation_m": 369.93222655915,
   "start_xy": [
    666541.717726363,
    4693110.74584032
   ],
   "end_xy": [
    666531.7708640343,
    4693109.716311392
   ]
  },
  "max_20m": {
   "gradient_pct": 21.02360217825975,
   "start_distance_m": 956.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 966.0,
   "start_elevation_m": 365.7275061234981,
   "end_elevation_m": 369.93222655915,
   "start_xy": [
    666551.6645886918,
    4693111.775369247
   ],
   "end_xy": [
    666531.7708640343,
    4693109.716311392
   ]
  },
  "max_25m": {
   "gradient_pct": 20.48824050927874,
   "start_distance_m": 951.0,
   "end_distance_m": 976.0,
   "midpoint_distance_m": 963.5,
   "start_elevation_m": 364.81016643183034,
   "end_elevation_m": 369.93222655915,
   "start_xy": [
    666556.6380198562,
    4693112.290133712
   ],
   "end_xy": [
    666531.7708640343,
    4693109.716311392
   ]
  },
  "max_50m": {
   "gradient_pct": 19.39137201240112,
   "start_distance_m": 1052.0,
   "end_distance_m": 1102.0,
   "midpoint_distance_m": 1077.0,
   "start_elevation_m": 382.66911796143154,
   "end_elevation_m": 392.3648039676321,
   "start_xy": [
    666456.2828140613,
    4693100.920512048
   ],
   "end_xy": [
    666406.850479301,
    4693093.407571203
   ]
  },
  "max_100m": {
   "gradient_pct": 18.0168599667781,
   "start_distance_m": 1005.0,
   "end_distance_m": 1105.0,
   "midpoint_distance_m": 1055.0,
   "start_elevation_m": 374.8422996061032,
   "end_elevation_m": 392.8591595728813,
   "start_xy": [
    666502.9566767053,
    4693106.44401267
   ],
   "end_xy": [
    666403.8845392152,
    4693092.956794752
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -20.051625942753617,
   "start_distance_m": 1805.0,
   "end_distance_m": 1810.0,
   "midpoint_distance_m": 1807.5,
   "start_elevation_m": 457.58724811719003,
   "end_elevation_m": 456.58466682005235,
   "start_xy": [
    665777.0855906835,
    4692860.763685909
   ],
   "end_xy": [
    665772.4922107286,
    4692858.793372261
   ]
  },
  "min_10m": {
   "gradient_pct": -18.404272128618118,
   "start_distance_m": 1803.0,
   "end_distance_m": 1813.0,
   "midpoint_distance_m": 1808.0,
   "start_elevation_m": 457.91786169643854,
   "end_elevation_m": 456.0774344835767,
   "start_xy": [
    665778.8897871901,
    4692861.626747301
   ],
   "end_xy": [
    665769.7139927967,
    4692857.66133643
   ]
  },
  "min_20m": {
   "gradient_pct": -15.738882336314077,
   "start_distance_m": 1802.0,
   "end_distance_m": 1822.0,
   "midpoint_distance_m": 1812.0,
   "start_elevation_m": 458.0262553423233,
   "end_elevation_m": 454.87847887506047,
   "start_xy": [
    665779.7918854434,
    4692862.058277996
   ],
   "end_xy": [
    665761.3106758264,
    4692854.457445146
   ]
  },
  "min_25m": {
   "gradient_pct": -14.723805483336264,
   "start_distance_m": 1800.0,
   "end_distance_m": 1825.0,
   "midpoint_distance_m": 1812.5,
   "start_elevation_m": 458.2150345922795,
   "end_elevation_m": 454.5340832214454,
   "start_xy": [
    665781.59608195,
    4692862.921339388
   ],
   "end_xy": [
    665758.4440057628,
    4692853.573022879
   ]
  },
  "min_50m": {
   "gradient_pct": -11.338795966122916,
   "start_distance_m": 1802.0,
   "end_distance_m": 1852.0,
   "midpoint_distance_m": 1827.0,
   "start_elevation_m": 458.0262553423233,
   "end_elevation_m": 452.3568573592618,
   "start_xy": [
    665779.7918854434,
    4692862.058277996
   ],
   "end_xy": [
    665732.9997527082,
    4692844.919294745
   ]
  },
  "min_100m": {
   "gradient_pct": -7.462222819543513,
   "start_distance_m": 1764.0,
   "end_distance_m": 1864.0,
   "midpoint_distance_m": 1814.0,
   "start_elevation_m": 459.5743409670291,
   "end_elevation_m": 452.1121181474856,
   "start_xy": [
    665816.4071068157,
    4692871.631913415
   ],
   "end_xy": [
    665721.0029098621,
    4692845.072566448
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 29.682840521513754,
   "start_distance_m": 1014.0,
   "end_distance_m": 1016.0,
   "midpoint_distance_m": 1015.0,
   "start_elevation_m": 376.5014755182466,
   "end_elevation_m": 377.09513232867687,
   "start_xy": [
    666494.0184447963,
    4693105.391391967
   ],
   "end_xy": [
    666492.0321710388,
    4693105.157476257
   ]
  },
  "max_3m": {
   "gradient_pct": 28.581409207481556,
   "start_distance_m": 1014.0,
   "end_distance_m": 1017.0,
   "midpoint_distance_m": 1015.5,
   "start_elevation_m": 376.5014755182466,
   "end_elevation_m": 377.35891779447104,
   "start_xy": [
    666494.0184447963,
    4693105.391391967
   ],
   "end_xy": [
    666491.0390341601,
    4693105.0405184
   ]
  }
 },
 "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": 0.435,
   "obstruction_max_height_m": 30.02,
   "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_x66y470_MA_Western_B24.tif"
  ],
  "calculated_at": "2026-09-04T21:42:40+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": [
   "x66y470"
  ],
  "route_summit_trim_m": 848.2,
  "route_summit_trim_loss_m": 40.1,
  "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_L2_2015_LAS_2018",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.997,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Middlefield",
  "county": "Massachusetts"
 }
}