{
 "ocl_version": "0.1.0",
 "name": "Tubbs Hill Road",
 "slug": "tubbs-hill-road",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.58673392453113,
   "diagnostic": true,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1313.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 361.66271960871416,
   "end_elevation_m": 362.3344542872048,
   "min_gradient_pct": -19.71602463991644,
   "suppressed_max_gradient_pct": 38.965546382422644,
   "suppressed_location_m": [
    1293.0,
    1295.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 30.85978607723329,
   "diagnostic": true,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1312.0,
   "end_distance_m": 1315.0,
   "start_elevation_m": 361.4086607048878,
   "end_elevation_m": 362.3344542872048,
   "min_gradient_pct": -19.37207405125226,
   "suppressed_max_gradient_pct": 36.8482112474131,
   "suppressed_location_m": [
    1292.0,
    1295.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 29.092443754786927,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded"
   ],
   "start_distance_m": 1274.0,
   "end_distance_m": 1279.0,
   "start_elevation_m": 352.6958138832535,
   "end_elevation_m": 354.15043607099284,
   "min_gradient_pct": -18.687547523533112,
   "suppressed_max_gradient_pct": 34.13077902200939,
   "suppressed_location_m": [
    1292.0,
    1297.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 26.57203328474168,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1269.0,
   "end_distance_m": 1279.0,
   "start_elevation_m": 351.49323274251867,
   "end_elevation_m": 354.15043607099284,
   "min_gradient_pct": -18.497307869080828,
   "suppressed_max_gradient_pct": 29.663166576888784,
   "suppressed_location_m": [
    1289.0,
    1299.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 23.68707697190132,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1259.0,
   "end_distance_m": 1279.0,
   "start_elevation_m": 349.4130206766126,
   "end_elevation_m": 354.15043607099284,
   "min_gradient_pct": -17.523216170343403,
   "suppressed_max_gradient_pct": 28.226578902380197,
   "suppressed_location_m": [
    1276.0,
    1296.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.013824861912553,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1254.0,
   "end_distance_m": 1279.0,
   "start_elevation_m": 348.6469798555147,
   "end_elevation_m": 354.15043607099284,
   "min_gradient_pct": -17.597650509399273,
   "suppressed_max_gradient_pct": 28.033958040833568,
   "suppressed_location_m": [
    1273.0,
    1298.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 18.596752109037425,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 566.0,
   "end_distance_m": 616.0,
   "start_elevation_m": 339.27133009046537,
   "end_elevation_m": 348.5697061449841,
   "min_gradient_pct": -16.925863840258785,
   "suppressed_max_gradient_pct": 23.59162863397637,
   "suppressed_location_m": [
    1265.0,
    1315.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.880415172683456,
   "diagnostic": false,
   "flags": [
    "no_bench_excluded",
    "canopy_or_structure"
   ],
   "start_distance_m": 1861.0,
   "end_distance_m": 1961.0,
   "start_elevation_m": 363.74494327590435,
   "end_elevation_m": 379.6253584485878,
   "min_gradient_pct": -14.044115435238268,
   "suppressed_max_gradient_pct": 18.241651130267314,
   "suppressed_location_m": [
    1233.0,
    1333.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.338,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 112.0,
  "shape_class": "sustained"
 },
 "length_m": 2054.216970250908,
 "start_elevation_m": 341.508238402834,
 "end_elevation_m": 385.413501205445,
 "endpoint_gain_m": 43.90526280261099,
 "overall_gradient_pct": 2.1373235368242662,
 "accumulated_ascent_m": 96.75535879357955,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 29.092443754786927,
   "start_distance_m": 1274.0,
   "end_distance_m": 1279.0,
   "midpoint_distance_m": 1276.5,
   "start_elevation_m": 352.6958138832535,
   "end_elevation_m": 354.15043607099284,
   "start_xy": [
    268473.6718233132,
    4774120.686722762
   ],
   "end_xy": [
    268468.6736253782,
    4774120.552493845
   ]
  },
  "max_10m": {
   "gradient_pct": 26.57203328474168,
   "start_distance_m": 1269.0,
   "end_distance_m": 1279.0,
   "midpoint_distance_m": 1274.0,
   "start_elevation_m": 351.49323274251867,
   "end_elevation_m": 354.15043607099284,
   "start_xy": [
    268478.6700212483,
    4774120.820951679
   ],
   "end_xy": [
    268468.6736253782,
    4774120.552493845
   ]
  },
  "max_20m": {
   "gradient_pct": 23.68707697190132,
   "start_distance_m": 1259.0,
   "end_distance_m": 1279.0,
   "midpoint_distance_m": 1269.0,
   "start_elevation_m": 349.4130206766126,
   "end_elevation_m": 354.15043607099284,
   "start_xy": [
    268488.66641711834,
    4774121.0894095125
   ],
   "end_xy": [
    268468.6736253782,
    4774120.552493845
   ]
  },
  "max_25m": {
   "gradient_pct": 22.013824861912553,
   "start_distance_m": 1254.0,
   "end_distance_m": 1279.0,
   "midpoint_distance_m": 1266.5,
   "start_elevation_m": 348.6469798555147,
   "end_elevation_m": 354.15043607099284,
   "start_xy": [
    268493.6646150534,
    4774121.223638429
   ],
   "end_xy": [
    268468.6736253782,
    4774120.552493845
   ]
  },
  "max_50m": {
   "gradient_pct": 18.596752109037425,
   "start_distance_m": 566.0,
   "end_distance_m": 616.0,
   "midpoint_distance_m": 591.0,
   "start_elevation_m": 339.27133009046537,
   "end_elevation_m": 348.5697061449841,
   "start_xy": [
    269146.1890542545,
    4773953.559693806
   ],
   "end_xy": [
    269096.5352341504,
    4773947.686181307
   ]
  },
  "max_100m": {
   "gradient_pct": 15.880415172683456,
   "start_distance_m": 1861.0,
   "end_distance_m": 1961.0,
   "midpoint_distance_m": 1911.0,
   "start_elevation_m": 363.74494327590435,
   "end_elevation_m": 379.6253584485878,
   "start_xy": [
    267914.7434232978,
    4774287.612923386
   ],
   "end_xy": [
    267822.8694390501,
    4774326.626853117
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -18.687547523533112,
   "start_distance_m": 203.0,
   "end_distance_m": 208.0,
   "midpoint_distance_m": 205.5,
   "start_elevation_m": 340.5057749675363,
   "end_elevation_m": 339.57139759135964,
   "start_xy": [
    269504.53198931465,
    4773995.847817811
   ],
   "end_xy": [
    269499.59126636764,
    4773995.080187196
   ]
  },
  "min_10m": {
   "gradient_pct": -18.497307869080828,
   "start_distance_m": 200.0,
   "end_distance_m": 210.0,
   "midpoint_distance_m": 205.0,
   "start_elevation_m": 341.0703271064532,
   "end_elevation_m": 339.2205963195451,
   "start_xy": [
    269507.4964230829,
    4773996.30839618
   ],
   "end_xy": [
    269497.6149771888,
    4773994.773134951
   ]
  },
  "min_20m": {
   "gradient_pct": -17.523216170343403,
   "start_distance_m": 194.0,
   "end_distance_m": 214.0,
   "midpoint_distance_m": 204.0,
   "start_elevation_m": 342.09220891343335,
   "end_elevation_m": 338.5875656793647,
   "start_xy": [
    269513.4252906193,
    4773997.229552917
   ],
   "end_xy": [
    269493.6198656348,
    4773994.931226292
   ]
  },
  "min_25m": {
   "gradient_pct": -17.597650509399273,
   "start_distance_m": 200.0,
   "end_distance_m": 225.0,
   "midpoint_distance_m": 212.5,
   "start_elevation_m": 341.0703271064532,
   "end_elevation_m": 336.6709144791034,
   "start_xy": [
    269507.4964230829,
    4773996.30839618
   ],
   "end_xy": [
    269482.63055320014,
    4773995.416006875
   ]
  },
  "min_50m": {
   "gradient_pct": -16.925863840258785,
   "start_distance_m": 194.0,
   "end_distance_m": 244.0,
   "midpoint_distance_m": 219.0,
   "start_elevation_m": 342.09220891343335,
   "end_elevation_m": 333.62927699330396,
   "start_xy": [
    269513.4252906193,
    4773997.229552917
   ],
   "end_xy": [
    269463.6490135403,
    4773996.253355155
   ]
  },
  "min_100m": {
   "gradient_pct": -14.044115435238268,
   "start_distance_m": 169.0,
   "end_distance_m": 269.0,
   "midpoint_distance_m": 219.0,
   "start_elevation_m": 344.6532158441402,
   "end_elevation_m": 330.60910040890195,
   "start_xy": [
    269538.12890535453,
    4774001.067705991
   ],
   "end_xy": [
    269438.742545869,
    4773996.2747643115
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.58673392453113,
   "start_distance_m": 1313.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1314.0,
   "start_elevation_m": 361.66271960871416,
   "end_elevation_m": 362.3344542872048,
   "start_xy": [
    268435.835724387,
    4774128.232739395
   ],
   "end_xy": [
    268433.9842805203,
    4774128.989149079
   ]
  },
  "max_3m": {
   "gradient_pct": 30.85978607723329,
   "start_distance_m": 1312.0,
   "end_distance_m": 1315.0,
   "midpoint_distance_m": 1313.5,
   "start_elevation_m": 361.4086607048878,
   "end_elevation_m": 362.3344542872048,
   "start_xy": [
    268436.7614463204,
    4774127.854534554
   ],
   "end_xy": [
    268433.9842805203,
    4774128.989149079
   ]
  }
 },
 "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": {
  "no_bench_suppression": {
   "masked_fraction": 0.03,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.387,
   "obstruction_max_height_m": 26.48,
   "flagged_windows_m": [
    2,
    3,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "excluded_ranges_m": [
   [
    1280.0,
    1310.0
   ],
   [
    1830.0,
    1860.0
   ]
  ],
  "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:26919",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/usa/nh/USGS_1M_19_x26y478_NH_Coastal_2019_B19.tif"
  ],
  "calculated_at": "2026-09-05T00:04:42+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": "hunt-wave2-260905",
  "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, NH_Coastal_2019_B19 (collected 2019)",
  "elevation_tile_ids": [
   "x26y478"
  ],
  "climb_origin": "discovered",
  "canopy_source": {
   "kind": "ept_corridor_max_return",
   "ept_source": "https://s3-us-west-2.amazonaws.com/usgs-lidar-public/NH_Coastal_2_2019",
   "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"
 },
 "area": {
  "place": "Deering",
  "county": "New Hampshire"
 }
}