{
 "ocl_version": "0.1.0",
 "name": "Glines Hill Road",
 "slug": "glines-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.34963860151902,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1297.0,
   "end_distance_m": 1299.0,
   "start_elevation_m": 288.1133636612234,
   "end_elevation_m": 288.58035643325377,
   "min_gradient_pct": -2.9141452065289286
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.970382270731687,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1296.0,
   "end_distance_m": 1299.0,
   "start_elevation_m": 287.8912449651318,
   "end_elevation_m": 288.58035643325377,
   "min_gradient_pct": -2.4324518002098707
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.546610592046363,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1296.0,
   "end_distance_m": 1301.0,
   "start_elevation_m": 287.8912449651318,
   "end_elevation_m": 289.01857549473414,
   "min_gradient_pct": -2.2539666090335686
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.324171393364054,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1297.0,
   "end_distance_m": 1307.0,
   "start_elevation_m": 288.1133636612234,
   "end_elevation_m": 290.3457808005598,
   "min_gradient_pct": -2.1295637338937468
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.112168438518438,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1295.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 287.67697215523947,
   "end_elevation_m": 292.09940584294316,
   "min_gradient_pct": -2.038689952019581
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.983727868279857,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1290.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 286.6034738758732,
   "end_elevation_m": 292.09940584294316,
   "min_gradient_pct": -1.910298707593256
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.904843755930415,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1281.0,
   "end_distance_m": 1331.0,
   "start_elevation_m": 284.7996655532593,
   "end_elevation_m": 295.2520874312245,
   "min_gradient_pct": -1.4077828553129166
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.579363764198888,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1220.0,
   "end_distance_m": 1320.0,
   "start_elevation_m": 273.5404115737301,
   "end_elevation_m": 293.119775337929,
   "min_gradient_pct": -0.39864930409947874
  }
 ],
 "shape": {
  "ascent_concentration": 0.433,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 452.0,
  "shape_class": "sustained"
 },
 "length_m": 2146.000000000079,
 "start_elevation_m": 158.94380084959886,
 "end_elevation_m": 350.35755580995885,
 "endpoint_gain_m": 191.41375496036,
 "overall_gradient_pct": 8.919559876996875,
 "accumulated_ascent_m": 192.36118635606888,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.546610592046363,
   "start_distance_m": 1296.0,
   "end_distance_m": 1301.0,
   "midpoint_distance_m": 1298.5,
   "start_elevation_m": 287.8912449651318,
   "end_elevation_m": 289.01857549473414,
   "start_xy": [
    331914.0336664384,
    4864032.763104633
   ],
   "end_xy": [
    331909.1875774315,
    4864033.994127322
   ]
  },
  "max_10m": {
   "gradient_pct": 22.324171393364054,
   "start_distance_m": 1297.0,
   "end_distance_m": 1307.0,
   "midpoint_distance_m": 1302.0,
   "start_elevation_m": 288.1133636612234,
   "end_elevation_m": 290.3457808005598,
   "start_xy": [
    331913.06463825447,
    4864033.010054685
   ],
   "end_xy": [
    331903.30400862056,
    4864035.019421068
   ]
  },
  "max_20m": {
   "gradient_pct": 22.112168438518438,
   "start_distance_m": 1295.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1305.0,
   "start_elevation_m": 287.67697215523947,
   "end_elevation_m": 292.09940584294316,
   "start_xy": [
    331915.00290628616,
    4864032.516986639
   ],
   "end_xy": [
    331895.3105716083,
    4864035.343379515
   ]
  },
  "max_25m": {
   "gradient_pct": 21.983727868279857,
   "start_distance_m": 1290.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1302.5,
   "start_elevation_m": 286.6034738758732,
   "end_elevation_m": 292.09940584294316,
   "start_xy": [
    331919.8489953152,
    4864031.285964037
   ],
   "end_xy": [
    331895.3105716083,
    4864035.343379515
   ]
  },
  "max_50m": {
   "gradient_pct": 20.904843755930415,
   "start_distance_m": 1281.0,
   "end_distance_m": 1331.0,
   "midpoint_distance_m": 1306.0,
   "start_elevation_m": 284.7996655532593,
   "end_elevation_m": 295.2520874312245,
   "start_xy": [
    331928.5051809588,
    4864028.861802962
   ],
   "end_xy": [
    331879.3359094432,
    4864035.467779147
   ]
  },
  "max_100m": {
   "gradient_pct": 19.579363764198888,
   "start_distance_m": 1220.0,
   "end_distance_m": 1320.0,
   "midpoint_distance_m": 1270.0,
   "start_elevation_m": 273.5404115737301,
   "end_elevation_m": 293.119775337929,
   "start_xy": [
    331983.9984949276,
    4864003.574123261
   ],
   "end_xy": [
    331890.31465415726,
    4864035.54537621
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.2539666090335686,
   "start_distance_m": 1914.0,
   "end_distance_m": 1919.0,
   "midpoint_distance_m": 1916.5,
   "start_elevation_m": 345.2828768666825,
   "end_elevation_m": 345.1701785362308,
   "start_xy": [
    331329.36516266246,
    4863887.931332538
   ],
   "end_xy": [
    331324.94417060615,
    4863885.595774964
   ]
  },
  "min_10m": {
   "gradient_pct": -2.1295637338937468,
   "start_distance_m": 1917.0,
   "end_distance_m": 1927.0,
   "midpoint_distance_m": 1922.0,
   "start_elevation_m": 345.2195336945899,
   "end_elevation_m": 345.00657732120055,
   "start_xy": [
    331326.7125591264,
    4863886.530013702
   ],
   "end_xy": [
    331317.87093714887,
    4863881.858213403
   ]
  },
  "min_20m": {
   "gradient_pct": -2.038689952019581,
   "start_distance_m": 1914.0,
   "end_distance_m": 1934.0,
   "midpoint_distance_m": 1924.0,
   "start_elevation_m": 345.2828768666825,
   "end_elevation_m": 344.8751388762786,
   "start_xy": [
    331329.36516266246,
    4863887.931332538
   ],
   "end_xy": [
    331311.6817241677,
    4863878.58810089
   ]
  },
  "min_25m": {
   "gradient_pct": -1.910298707593256,
   "start_distance_m": 1914.0,
   "end_distance_m": 1939.0,
   "midpoint_distance_m": 1926.5,
   "start_elevation_m": 345.2828768666825,
   "end_elevation_m": 344.8053021897842,
   "start_xy": [
    331329.36516266246,
    4863887.931332538
   ],
   "end_xy": [
    331307.2609135441,
    4863876.252200933
   ]
  },
  "min_50m": {
   "gradient_pct": -1.4077828553129166,
   "start_distance_m": 1896.0,
   "end_distance_m": 1946.0,
   "midpoint_distance_m": 1921.0,
   "start_elevation_m": 345.4531441889501,
   "end_elevation_m": 344.74925276129363,
   "start_xy": [
    331345.2798145163,
    4863896.341078273
   ],
   "end_xy": [
    331301.0717005633,
    4863872.98208842
   ]
  },
  "min_100m": {
   "gradient_pct": -0.39864930409947874,
   "start_distance_m": 1885.0,
   "end_distance_m": 1985.0,
   "midpoint_distance_m": 1935.0,
   "start_elevation_m": 345.40213939683366,
   "end_elevation_m": 345.0034900927342,
   "start_xy": [
    331355.0060212256,
    4863901.479257819
   ],
   "end_xy": [
    331266.14971210936,
    4863855.639562813
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.34963860151902,
   "start_distance_m": 1297.0,
   "end_distance_m": 1299.0,
   "midpoint_distance_m": 1298.0,
   "start_elevation_m": 288.1133636612234,
   "end_elevation_m": 288.58035643325377,
   "start_xy": [
    331913.06463825447,
    4864033.010054685
   ],
   "end_xy": [
    331911.1260707501,
    4864033.5019448865
   ]
  },
  "max_3m": {
   "gradient_pct": 22.970382270731687,
   "start_distance_m": 1296.0,
   "end_distance_m": 1299.0,
   "midpoint_distance_m": 1297.5,
   "start_elevation_m": 287.8912449651318,
   "end_elevation_m": 288.58035643325377,
   "start_xy": [
    331914.0336664384,
    4864032.763104633
   ],
   "end_xy": [
    331911.1260707501,
    4864033.5019448865
   ]
  }
 },
 "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": 0.26,
   "obstruction_max_height_m": 26.46,
   "flagged_windows_m": [
    3,
    5,
    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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/nh/USGS_1M_19_x32y487_NH_Umbagog_LiDAR_2016_D16.tif",
   "data/cache/usa/nh/USGS_1M_19_x33y487_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-09-03T22:51:20+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/new-hampshire-260822.osm.pbf",
  "osm_snapshot": "2026-08-21T20:21:11Z",
  "run_id": "extent-trim-v2-260903",
  "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, NH_Umbagog_LiDAR_2016_D16 (collected 2016)",
  "elevation_tile_ids": [
   "x32y487",
   "x33y487"
  ],
  "route_cut_m": 2146.0,
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Umbagog_2016",
   "ept_crs": "EPSG:3857",
   "station_coverage": 0.995,
   "cell_ground_m": 1.0,
   "nodes_failed": 0
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "Eaton",
  "county": "New Hampshire"
 }
}