{
 "ocl_version": "0.1.0",
 "name": "Arthur's Pass from Arthur's Pass",
 "slug": "arthur-s-pass-from-arthur-s-pass",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 14.348416954970844,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 389.0,
   "end_distance_m": 391.0,
   "start_elevation_m": 762.4436825955638,
   "end_elevation_m": 762.7306509346632,
   "min_gradient_pct": -7.5910505663387084,
   "suppressed_max_gradient_pct": 135.07301979244062,
   "suppressed_location_m": [
    1253.0,
    1255.0
   ],
   "suppressed_min_gradient_pct": -176.74982245320052,
   "suppressed_min_location_m": [
    1812.0,
    1814.0
   ]
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 13.63453262647075,
   "diagnostic": true,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 389.0,
   "end_distance_m": 392.0,
   "start_elevation_m": 762.4436825955638,
   "end_elevation_m": 762.8527185743579,
   "min_gradient_pct": -7.420908498522749,
   "suppressed_max_gradient_pct": 130.30147085886483,
   "suppressed_location_m": [
    1253.0,
    1256.0
   ],
   "suppressed_min_gradient_pct": -155.0237467716632,
   "suppressed_min_location_m": [
    1812.0,
    1815.0
   ]
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 13.412949638150167,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 2115.0,
   "end_distance_m": 2120.0,
   "start_elevation_m": 829.1995639270991,
   "end_elevation_m": 829.8702114090066,
   "min_gradient_pct": -7.358476207562035,
   "suppressed_max_gradient_pct": 98.5776936593993,
   "suppressed_location_m": [
    1252.0,
    1257.0
   ],
   "suppressed_min_gradient_pct": -118.52119434347969,
   "suppressed_min_location_m": [
    1809.0,
    1814.0
   ]
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 13.119346464538921,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 2115.0,
   "end_distance_m": 2125.0,
   "start_elevation_m": 829.1995639270991,
   "end_elevation_m": 830.511498573553,
   "min_gradient_pct": -7.163362191786291,
   "suppressed_max_gradient_pct": 61.532252552783575,
   "suppressed_location_m": [
    1853.0,
    1863.0
   ],
   "suppressed_min_gradient_pct": -108.31390335357469,
   "suppressed_min_location_m": [
    1806.0,
    1816.0
   ]
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 13.010414080394526,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 2002.0,
   "end_distance_m": 2022.0,
   "start_elevation_m": 814.8371885531205,
   "end_elevation_m": 817.4392713691994,
   "min_gradient_pct": -7.0318634032707905,
   "suppressed_max_gradient_pct": 51.111663945793,
   "suppressed_location_m": [
    1853.0,
    1873.0
   ],
   "suppressed_min_gradient_pct": -84.17434555637271,
   "suppressed_min_location_m": [
    1795.0,
    1815.0
   ]
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 12.981316714471632,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 1997.0,
   "end_distance_m": 2022.0,
   "start_elevation_m": 814.1939421905815,
   "end_elevation_m": 817.4392713691994,
   "min_gradient_pct": -7.013910405060415,
   "suppressed_max_gradient_pct": 51.77008665153653,
   "suppressed_location_m": [
    1850.0,
    1875.0
   ],
   "suppressed_min_gradient_pct": -74.61751438184046,
   "suppressed_min_location_m": [
    1793.0,
    1818.0
   ]
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 12.836627254660698,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 1985.0,
   "end_distance_m": 2035.0,
   "start_elevation_m": 812.6730493556263,
   "end_elevation_m": 819.0913629829566,
   "min_gradient_pct": -6.4814351006368724,
   "suppressed_max_gradient_pct": 44.11883750057882,
   "suppressed_location_m": [
    1829.0,
    1879.0
   ],
   "suppressed_min_gradient_pct": -38.15444193516191,
   "suppressed_min_location_m": [
    1775.0,
    1825.0
   ]
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 12.775759201205801,
   "diagnostic": false,
   "flags": [
    "structure_excluded",
    "structure_excluded_min"
   ],
   "start_distance_m": 1985.0,
   "end_distance_m": 2085.0,
   "start_elevation_m": 812.6730493556263,
   "end_elevation_m": 825.4488085568321,
   "min_gradient_pct": -5.517110329693992,
   "suppressed_max_gradient_pct": 26.934235624397957,
   "suppressed_location_m": [
    1829.0,
    1929.0
   ],
   "suppressed_min_gradient_pct": -20.912095967345635,
   "suppressed_min_location_m": [
    1720.0,
    1820.0
   ]
  }
 ],
 "shape": {
  "ascent_concentration": 0.418,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 252.0,
  "shape_class": "sustained"
 },
 "length_m": 3813.318729583708,
 "start_elevation_m": 744.1236250927724,
 "end_elevation_m": 918.2143563759716,
 "endpoint_gain_m": 174.09073128319926,
 "overall_gradient_pct": 4.565333863456108,
 "accumulated_ascent_m": 215.89363449380357,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 13.412949638150167,
   "start_distance_m": 2115.0,
   "end_distance_m": 2120.0,
   "midpoint_distance_m": 2117.5,
   "start_elevation_m": 829.1995639270991,
   "end_elevation_m": 829.8702114090066,
   "start_xy": [
    1482288.3003493692,
    5246802.947010055
   ],
   "end_xy": [
    1482289.489168387,
    5246807.803625064
   ]
  },
  "max_10m": {
   "gradient_pct": 13.119346464538921,
   "start_distance_m": 2115.0,
   "end_distance_m": 2125.0,
   "midpoint_distance_m": 2120.0,
   "start_elevation_m": 829.1995639270991,
   "end_elevation_m": 830.511498573553,
   "start_xy": [
    1482288.3003493692,
    5246802.947010055
   ],
   "end_xy": [
    1482290.698583726,
    5246812.654687429
   ]
  },
  "max_20m": {
   "gradient_pct": 13.010414080394526,
   "start_distance_m": 2002.0,
   "end_distance_m": 2022.0,
   "midpoint_distance_m": 2012.0,
   "start_elevation_m": 814.8371885531205,
   "end_elevation_m": 817.4392713691994,
   "start_xy": [
    1482258.5631957036,
    5246694.166236725
   ],
   "end_xy": [
    1482264.2612535325,
    5246713.324146369
   ]
  },
  "max_25m": {
   "gradient_pct": 12.981316714471632,
   "start_distance_m": 1997.0,
   "end_distance_m": 2022.0,
   "midpoint_distance_m": 2009.5,
   "start_elevation_m": 814.1939421905815,
   "end_elevation_m": 817.4392713691994,
   "start_xy": [
    1482257.350394311,
    5246689.315555043
   ],
   "end_xy": [
    1482264.2612535325,
    5246713.324146369
   ]
  },
  "max_50m": {
   "gradient_pct": 12.836627254660698,
   "start_distance_m": 1985.0,
   "end_distance_m": 2035.0,
   "midpoint_distance_m": 2010.0,
   "start_elevation_m": 812.6730493556263,
   "end_elevation_m": 819.0913629829566,
   "start_xy": [
    1482255.3504135155,
    5246677.4840496415
   ],
   "end_xy": [
    1482267.6055220852,
    5246725.88662494
   ]
  },
  "max_100m": {
   "gradient_pct": 12.775759201205801,
   "start_distance_m": 1985.0,
   "end_distance_m": 2085.0,
   "midpoint_distance_m": 2035.0,
   "start_elevation_m": 812.6730493556263,
   "end_elevation_m": 825.4488085568321,
   "start_xy": [
    1482255.3504135155,
    5246677.4840496415
   ],
   "end_xy": [
    1482282.3389554073,
    5246773.552430788
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -7.358476207562035,
   "start_distance_m": 1684.0,
   "end_distance_m": 1689.0,
   "midpoint_distance_m": 1686.5,
   "start_elevation_m": 802.00238991581,
   "end_elevation_m": 801.6344661054319,
   "start_xy": [
    1482266.6375433689,
    5246379.415817787
   ],
   "end_xy": [
    1482265.278017929,
    5246384.2274381565
   ]
  },
  "min_10m": {
   "gradient_pct": -7.163362191786291,
   "start_distance_m": 1684.0,
   "end_distance_m": 1694.0,
   "midpoint_distance_m": 1689.0,
   "start_elevation_m": 802.00238991581,
   "end_elevation_m": 801.2860536966314,
   "start_xy": [
    1482266.6375433689,
    5246379.415817787
   ],
   "end_xy": [
    1482263.9184924893,
    5246389.039058525
   ]
  },
  "min_20m": {
   "gradient_pct": -7.0318634032707905,
   "start_distance_m": 1683.0,
   "end_distance_m": 1703.0,
   "midpoint_distance_m": 1693.0,
   "start_elevation_m": 802.0771224386299,
   "end_elevation_m": 800.6707497579757,
   "start_xy": [
    1482266.8912977728,
    5246378.448858793
   ],
   "end_xy": [
    1482261.4713466975,
    5246397.699975191
   ]
  },
  "min_25m": {
   "gradient_pct": -7.013910405060415,
   "start_distance_m": 1683.0,
   "end_distance_m": 1708.0,
   "midpoint_distance_m": 1695.5,
   "start_elevation_m": 802.0771224386299,
   "end_elevation_m": 800.3236448373648,
   "start_xy": [
    1482266.8912977728,
    5246378.448858793
   ],
   "end_xy": [
    1482260.1516928528,
    5246402.522643266
   ]
  },
  "min_50m": {
   "gradient_pct": -6.4814351006368724,
   "start_distance_m": 1676.0,
   "end_distance_m": 1726.0,
   "midpoint_distance_m": 1701.0,
   "start_elevation_m": 802.491123894935,
   "end_elevation_m": 799.2504063446165,
   "start_xy": [
    1482268.4507073157,
    5246371.6247660415
   ],
   "end_xy": [
    1482255.425742467,
    5246419.8911585
   ]
  },
  "min_100m": {
   "gradient_pct": -5.517110329693992,
   "start_distance_m": 1647.0,
   "end_distance_m": 1747.0,
   "midpoint_distance_m": 1697.0,
   "start_elevation_m": 803.778899138264,
   "end_elevation_m": 798.26178880857,
   "start_xy": [
    1482270.5455896615,
    5246342.806278965
   ],
   "end_xy": [
    1482251.1701008414,
    5246440.449220217
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 14.348416954970844,
   "start_distance_m": 389.0,
   "end_distance_m": 391.0,
   "midpoint_distance_m": 390.0,
   "start_elevation_m": 762.4436825955638,
   "end_elevation_m": 762.7306509346632,
   "start_xy": [
    1482489.5897949687,
    5245365.444940089
   ],
   "end_xy": [
    1482488.9972615745,
    5245367.355150595
   ]
  },
  "max_3m": {
   "gradient_pct": 13.63453262647075,
   "start_distance_m": 389.0,
   "end_distance_m": 392.0,
   "midpoint_distance_m": 390.5,
   "start_elevation_m": 762.4436825955638,
   "end_elevation_m": 762.8527185743579,
   "start_xy": [
    1482489.5897949687,
    5245365.444940089
   ],
   "end_xy": [
    1482488.7009948774,
    5245368.310255849
   ]
  }
 },
 "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": 0.045,
   "windows_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "windows_unresolved": [],
   "minima_resited": [
    2.0,
    3.0,
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
   ],
   "minima_unresolved": []
  },
  "no_bench_suppression": {
   "masked_fraction": 0.045,
   "windows_resited": [],
   "windows_unresolved": [],
   "minima_resited": [],
   "minima_unresolved": []
  },
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.042,
   "obstruction_max_height_m": 19.52,
   "flagged_windows_m": []
  },
  "excluded_ranges_m": [
   [
    443.0,
    460.0
   ],
   [
    1224.0,
    1261.0
   ],
   [
    1785.0,
    1879.0
   ],
   [
    3267.0,
    3286.0
   ]
  ],
  "review": [],
  "extent": []
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "run_manifest": {
   "manifest_version": "1",
   "code_git_sha": "f5ccc1713da600fbea2ba1433fb64f96644949ee",
   "code_git_dirty": "false",
   "analysis_version": "0.1.0",
   "analysis_config_digest": "sha256:8c94015b54267da4",
   "python": "3.14.4",
   "numpy": "2.5.3",
   "rasterio": "1.5.1",
   "pyproj": "3.8.0",
   "laspy": "2.7.0",
   "shapely": "2.1.2",
   "pyosmium": "4.3.1",
   "libosmium": "2.23.1",
   "gdal": "3.12.4",
   "proj": "9.8.1",
   "run_id": "nz-s2",
   "road_pbf": "block-batch-nz-s2.osm.pbf",
   "region_key": "nz",
   "crs": "EPSG:2193",
   "elevation_provider_key": "nz-linz",
   "tile_index": "stac",
   "authority": "linz",
   "registry_pbf": "new-zealand-2026-09-26.osm.pbf",
   "tile_index_snapshot": "sha256:996c8a61eaf9687f"
  },
  "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:2193",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
   "data/cache/nz/BV20.tiff"
  ],
  "calculated_at": "2026-09-28T05:20:19+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-nz-s2.osm.pbf",
  "osm_snapshot": "",
  "run_id": "nz-s2",
  "elevation_provider": "LINZ nz-elevation",
  "elevation_licence": "CC BY 4.0 \u2014 Toit\u016b Te Whenua Land Information New Zealand \u2014 https://nz-elevation.s3.ap-southeast-2.amazonaws.com/LICENSE",
  "elevation_dataset": "New Zealand 1 m DEM/DSM national LiDAR mosaic \u2014 Toit\u016b Te Whenua Land Information New Zealand (LINZ), vertical datum NZVD2016 (LINZ documentation; not re-verified against a benchmark)",
  "elevation_tile_ids": [
   "BV20"
  ],
  "climb_origin": "named-pass",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "structure_own_ways": 18,
  "structure_mask_ranges_m": [
   [
    448.0,
    455.8
   ],
   [
    1242.0,
    1255.6
   ],
   [
    1790.3,
    1874.0
   ],
   [
    3272.8,
    3281.7
   ]
  ],
  "mask_basin_extension_m": 13.0,
  "carriageway": {
   "stations": 159,
   "stations_resolved": 159,
   "width_median_m": 9.5,
   "width_p10_m": 6.65,
   "width_min_m": 2.25,
   "width_max_m": 12.0,
   "bounded_share": 0.063,
   "unbounded_share": 0.937,
   "confidence_median": 0.0,
   "width_median_bounded_m": 7.0,
   "window_m": [
    1997.0,
    2022.0
   ],
   "width_at_max25_m": 10.5,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 159,
    "stations_resolved": 159,
    "width_median_m": 10.25,
    "width_p10_m": 4.75,
    "width_min_m": 0.75,
    "width_max_m": 12.0,
    "bounded_share": 0.421,
    "unbounded_share": 0.579,
    "confidence_median": 0.0,
    "width_median_bounded_m": 7.25,
    "window_m": [
     1997.0,
     2022.0
    ],
    "width_at_max25_m": 11.75,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Canterbury",
  "county": "Canterbury",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}