{
 "ocl_version": "0.1.0",
 "name": "Northwest Pond Road",
 "slug": "northwest-pond-road",
 "confidence": "U",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 46.85611360387156,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1830.0,
   "end_distance_m": 1832.0,
   "start_elevation_m": 651.3660945414215,
   "end_elevation_m": 652.3032168134989,
   "min_gradient_pct": -49.895569077563096
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 40.18761673892944,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1829.0,
   "end_distance_m": 1832.0,
   "start_elevation_m": 651.097588311331,
   "end_elevation_m": 652.3032168134989,
   "min_gradient_pct": -44.98691114708512
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 32.01840255589332,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1829.0,
   "end_distance_m": 1834.0,
   "start_elevation_m": 651.097588311331,
   "end_elevation_m": 652.6985084391257,
   "min_gradient_pct": -33.561817722120395
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 23.121228087629788,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 443.0,
   "end_distance_m": 453.0,
   "start_elevation_m": 628.1885198592094,
   "end_elevation_m": 630.5006426679723,
   "min_gradient_pct": -17.54646888879506
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 20.94930755937753,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 433.0,
   "end_distance_m": 453.0,
   "start_elevation_m": 626.3107811560968,
   "end_elevation_m": 630.5006426679723,
   "min_gradient_pct": -14.723931364920304
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.43450026801702,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 429.0,
   "end_distance_m": 454.0,
   "start_elevation_m": 625.5356713582364,
   "end_elevation_m": 630.6442964252407,
   "min_gradient_pct": -13.592564643213791
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 16.764622953087382,
   "diagnostic": false,
   "flags": [
    "structure_excluded"
   ],
   "start_distance_m": 272.0,
   "end_distance_m": 322.0,
   "start_elevation_m": 609.0380096373849,
   "end_elevation_m": 617.4203211139286,
   "min_gradient_pct": -10.284145435055507,
   "suppressed_max_gradient_pct": 17.534528946106775,
   "suppressed_location_m": [
    1914.0,
    1964.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 15.92382777254329,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 222.0,
   "end_distance_m": 322.0,
   "start_elevation_m": 601.4964933413853,
   "end_elevation_m": 617.4203211139286,
   "min_gradient_pct": -6.541107754706559
  }
 ],
 "shape": {
  "ascent_concentration": 0.406,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 228.0,
  "shape_class": "sustained"
 },
 "length_m": 2705.681650992336,
 "start_elevation_m": 580.6893344436611,
 "end_elevation_m": 672.6274896093729,
 "endpoint_gain_m": 91.9381551657118,
 "overall_gradient_pct": 3.397966465566729,
 "accumulated_ascent_m": 141.16402036021532,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 32.01840255589332,
   "start_distance_m": 1829.0,
   "end_distance_m": 1834.0,
   "midpoint_distance_m": 1831.5,
   "start_elevation_m": 651.097588311331,
   "end_elevation_m": 652.6985084391257,
   "start_xy": [
    359047.56105050776,
    5018144.344480907
   ],
   "end_xy": [
    359044.59202061954,
    5018140.321440402
   ]
  },
  "max_10m": {
   "gradient_pct": 23.121228087629788,
   "start_distance_m": 443.0,
   "end_distance_m": 453.0,
   "midpoint_distance_m": 448.0,
   "start_elevation_m": 628.1885198592094,
   "end_elevation_m": 630.5006426679723,
   "start_xy": [
    359908.40732627537,
    5019022.3831958985
   ],
   "end_xy": [
    359903.4951017965,
    5019013.67285501
   ]
  },
  "max_20m": {
   "gradient_pct": 20.94930755937753,
   "start_distance_m": 433.0,
   "end_distance_m": 453.0,
   "midpoint_distance_m": 443.0,
   "start_elevation_m": 626.3107811560968,
   "end_elevation_m": 630.5006426679723,
   "start_xy": [
    359913.3202849048,
    5019031.093122509
   ],
   "end_xy": [
    359903.4951017965,
    5019013.67285501
   ]
  },
  "max_25m": {
   "gradient_pct": 20.43450026801702,
   "start_distance_m": 429.0,
   "end_distance_m": 454.0,
   "midpoint_distance_m": 441.5,
   "start_elevation_m": 625.5356713582364,
   "end_elevation_m": 630.6442964252407,
   "start_xy": [
    359915.28531662334,
    5019034.577178776
   ],
   "end_xy": [
    359903.00329938275,
    5019012.802148192
   ]
  },
  "max_50m": {
   "gradient_pct": 16.764622953087382,
   "start_distance_m": 272.0,
   "end_distance_m": 322.0,
   "midpoint_distance_m": 297.0,
   "start_elevation_m": 609.0380096373849,
   "end_elevation_m": 617.4203211139286,
   "start_xy": [
    359978.1233612234,
    5019175.743478858
   ],
   "end_xy": [
    359949.122794546,
    5019135.110243278
   ]
  },
  "max_100m": {
   "gradient_pct": 15.92382777254329,
   "start_distance_m": 222.0,
   "end_distance_m": 322.0,
   "midpoint_distance_m": 272.0,
   "start_elevation_m": 601.4964933413853,
   "end_elevation_m": 617.4203211139286,
   "start_xy": [
    360008.7601746106,
    5019215.110900444
   ],
   "end_xy": [
    359949.122794546,
    5019135.110243278
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -33.561817722120395,
   "start_distance_m": 1824.0,
   "end_distance_m": 1829.0,
   "midpoint_distance_m": 1826.5,
   "start_elevation_m": 652.7756791974371,
   "end_elevation_m": 651.097588311331,
   "start_xy": [
    359050.53008039587,
    5018148.367521412
   ],
   "end_xy": [
    359047.56105050776,
    5018144.344480907
   ]
  },
  "min_10m": {
   "gradient_pct": -17.54646888879506,
   "start_distance_m": 1819.0,
   "end_distance_m": 1829.0,
   "midpoint_distance_m": 1824.0,
   "start_elevation_m": 652.8522352002105,
   "end_elevation_m": 651.097588311331,
   "start_xy": [
    359053.4991102841,
    5018152.390561917
   ],
   "end_xy": [
    359047.56105050776,
    5018144.344480907
   ]
  },
  "min_20m": {
   "gradient_pct": -14.723931364920304,
   "start_distance_m": 2014.0,
   "end_distance_m": 2034.0,
   "midpoint_distance_m": 2024.0,
   "start_elevation_m": 663.8938372600006,
   "end_elevation_m": 660.9490509870166,
   "start_xy": [
    358897.1941151916,
    5018048.557502613
   ],
   "end_xy": [
    358877.4386438501,
    5018045.6418066425
   ]
  },
  "min_25m": {
   "gradient_pct": -13.592564643213791,
   "start_distance_m": 1305.0,
   "end_distance_m": 1330.0,
   "midpoint_distance_m": 1317.5,
   "start_elevation_m": 630.2650177204933,
   "end_elevation_m": 626.8668765596899,
   "start_xy": [
    359231.2421144552,
    5018604.855980492
   ],
   "end_xy": [
    359225.74828075856,
    5018580.467095984
   ]
  },
  "min_50m": {
   "gradient_pct": -10.284145435055507,
   "start_distance_m": 1285.0,
   "end_distance_m": 1335.0,
   "midpoint_distance_m": 1310.0,
   "start_elevation_m": 631.6962281917814,
   "end_elevation_m": 626.5541554742537,
   "start_xy": [
    359237.86426475184,
    5018623.339007549
   ],
   "end_xy": [
    359224.6501581563,
    5018575.589174366
   ]
  },
  "min_100m": {
   "gradient_pct": -6.541107754706559,
   "start_distance_m": 498.0,
   "end_distance_m": 598.0,
   "midpoint_distance_m": 548.0,
   "start_elevation_m": 633.4367506805723,
   "end_elevation_m": 626.8956429258658,
   "start_xy": [
    359881.43254805636,
    5018974.452445614
   ],
   "end_xy": [
    359836.90913811524,
    5018885.429170336
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 46.85611360387156,
   "start_distance_m": 1830.0,
   "end_distance_m": 1832.0,
   "midpoint_distance_m": 1831.0,
   "start_elevation_m": 651.3660945414215,
   "end_elevation_m": 652.3032168134989,
   "start_xy": [
    359046.96730605996,
    5018143.539827236
   ],
   "end_xy": [
    359045.7794515106,
    5018141.930789993
   ]
  },
  "max_3m": {
   "gradient_pct": 40.18761673892944,
   "start_distance_m": 1829.0,
   "end_distance_m": 1832.0,
   "midpoint_distance_m": 1830.5,
   "start_elevation_m": 651.097588311331,
   "end_elevation_m": 652.3032168134989,
   "start_xy": [
    359047.56105050776,
    5018144.344480907
   ],
   "end_xy": [
    359045.7794515106,
    5018141.930789993
   ]
  }
 },
 "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": {
  "structure_suppression": {
   "masked_fraction": 0.019,
   "windows_resited": [
    50.0
   ],
   "windows_unresolved": []
  },
  "excluded_ranges_m": [
   [
    1874.0,
    1924.0
   ]
  ],
  "review": [
   "short_window_divergence"
  ],
  "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/me/USGS_1M_19_x35y502_NH_Umbagog_LiDAR_2016_D16.tif",
   "data/cache/usa/me/USGS_1M_19_x36y502_NH_Umbagog_LiDAR_2016_D16.tif"
  ],
  "calculated_at": "2026-08-25T06:10:32+00:00",
  "road_source": "../ne-docs/me/northwest-pond-road/northwest-pond-road.geojson",
  "run_id": "rebatch-xsection-me-260825",
  "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": [
   "x35y502",
   "x36y502"
  ],
  "climb_origin": "discovered",
  "notes": "NE box session: masked re-batch, xsection channel-crossing evidence (calibrated vs the NHD-confirmed population, 2026-08-25) + manifest masks where present. ADOPTED (NE wave 1, 2026-08-25): clean-steep. Wales dials per PRODUCTION 'US ADOPTION DIALS'. MASKED RE-BATCH (2026-08-25): culvert-class V-dip masks applied (NHD flowline / xsection channel-crossing evidence, ne-adoption-audits); superseded values in B2 redo trees.",
  "canopy_check": "unavailable \u2014 no surface model (DSM or point cloud) registered for this coverage",
  "mask_ranges_m": [
   [
    1879.0,
    1919.0
   ]
  ],
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing.html"
 },
 "area": {
  "place": "North Franklin",
  "county": "Maine"
 }
}