{
 "ocl_version": "0.1.0",
 "name": "Norwich Street",
 "slug": "norwich-street",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 22.753160124815963,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 964.0,
   "end_distance_m": 966.0,
   "start_elevation_m": 163.1305256787964,
   "end_elevation_m": 163.58558888129272,
   "min_gradient_pct": -4.700730000999442
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.81061760181255,
   "diagnostic": true,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 963.0,
   "end_distance_m": 966.0,
   "start_elevation_m": 162.90127035323835,
   "end_elevation_m": 163.58558888129272,
   "min_gradient_pct": -4.401312372348798
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.25168624353671,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 961.0,
   "end_distance_m": 966.0,
   "start_elevation_m": 162.4730045691159,
   "end_elevation_m": 163.58558888129272,
   "min_gradient_pct": -3.97804335068372
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.65065903051243,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 959.0,
   "end_distance_m": 969.0,
   "start_elevation_m": 162.03524669221395,
   "end_elevation_m": 164.2003125952652,
   "min_gradient_pct": -3.559384710500808
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.154159021352825,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 955.0,
   "end_distance_m": 975.0,
   "start_elevation_m": 161.22407095063815,
   "end_elevation_m": 165.45490275490872,
   "min_gradient_pct": -3.1918315993478075
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 20.623798763199943,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 953.0,
   "end_distance_m": 978.0,
   "start_elevation_m": 160.87930179779966,
   "end_elevation_m": 166.03525148859964,
   "min_gradient_pct": -3.2046657785997468
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 13.579716475170073,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 929.0,
   "end_distance_m": 979.0,
   "start_elevation_m": 159.42055146033277,
   "end_elevation_m": 166.2104096979178,
   "min_gradient_pct": -2.6086169737822047
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 11.961165643732457,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 27.0,
   "end_distance_m": 127.0,
   "start_elevation_m": 96.74887059817237,
   "end_elevation_m": 108.71003624190483,
   "min_gradient_pct": -1.305916782886925
  }
 ],
 "shape": {
  "ascent_concentration": 0.332,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 111.0,
  "shape_class": "sustained"
 },
 "length_m": 979.2940445471872,
 "start_elevation_m": 94.70422776660693,
 "end_elevation_m": 166.2568927514439,
 "endpoint_gain_m": 71.55266498483697,
 "overall_gradient_pct": 7.306555715645343,
 "accumulated_ascent_m": 73.422694658183,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.25168624353671,
   "start_distance_m": 961.0,
   "end_distance_m": 966.0,
   "midpoint_distance_m": 963.5,
   "start_elevation_m": 162.4730045691159,
   "end_elevation_m": 163.58558888129272,
   "start_xy": [
    1747847.6916655714,
    5430003.349277523
   ],
   "end_xy": [
    1747850.5935722163,
    5429999.290855687
   ]
  },
  "max_10m": {
   "gradient_pct": 21.65065903051243,
   "start_distance_m": 959.0,
   "end_distance_m": 969.0,
   "midpoint_distance_m": 964.0,
   "start_elevation_m": 162.03524669221395,
   "end_elevation_m": 164.2003125952652,
   "start_xy": [
    1747846.6790813296,
    5430005.074001604
   ],
   "end_xy": [
    1747852.4540506632,
    5429996.93742841
   ]
  },
  "max_20m": {
   "gradient_pct": 21.154159021352825,
   "start_distance_m": 955.0,
   "end_distance_m": 975.0,
   "midpoint_distance_m": 965.0,
   "start_elevation_m": 161.22407095063815,
   "end_elevation_m": 165.45490275490872,
   "start_xy": [
    1747844.653912846,
    5430008.523449765
   ],
   "end_xy": [
    1747856.1750075568,
    5429992.230573855
   ]
  },
  "max_25m": {
   "gradient_pct": 20.623798763199943,
   "start_distance_m": 953.0,
   "end_distance_m": 978.0,
   "midpoint_distance_m": 965.5,
   "start_elevation_m": 160.87930179779966,
   "end_elevation_m": 166.03525148859964,
   "start_xy": [
    1747843.6970327154,
    5430010.277760723
   ],
   "end_xy": [
    1747858.0354860036,
    5429989.877146578
   ]
  },
  "max_50m": {
   "gradient_pct": 13.579716475170073,
   "start_distance_m": 929.0,
   "end_distance_m": 979.0,
   "midpoint_distance_m": 954.0,
   "start_elevation_m": 159.42055146033277,
   "end_elevation_m": 166.2104096979178,
   "start_xy": [
    1747846.2849640811,
    5430029.958535062
   ],
   "end_xy": [
    1747858.6556454857,
    5429989.092670819
   ]
  },
  "max_100m": {
   "gradient_pct": 11.961165643732457,
   "start_distance_m": 27.0,
   "end_distance_m": 127.0,
   "midpoint_distance_m": 77.0,
   "start_elevation_m": 96.74887059817237,
   "end_elevation_m": 108.71003624190483,
   "start_xy": [
    1747783.7218029553,
    5430301.749873279
   ],
   "end_xy": [
    1747851.5007465563,
    5430228.574939982
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -3.97804335068372,
   "start_distance_m": 703.0,
   "end_distance_m": 708.0,
   "midpoint_distance_m": 705.5,
   "start_elevation_m": 151.41887548235022,
   "end_elevation_m": 151.21997331481603,
   "start_xy": [
    1748019.5877602943,
    5430157.069401457
   ],
   "end_xy": [
    1748018.1325419068,
    5430152.285852623
   ]
  },
  "min_10m": {
   "gradient_pct": -3.559384710500808,
   "start_distance_m": 699.0,
   "end_distance_m": 709.0,
   "midpoint_distance_m": 704.0,
   "start_elevation_m": 151.5468876255278,
   "end_elevation_m": 151.19094915447772,
   "start_xy": [
    1748020.6713749266,
    5430160.915859979
   ],
   "end_xy": [
    1748017.8414982294,
    5430151.329142856
   ]
  },
  "min_20m": {
   "gradient_pct": -3.1918315993478075,
   "start_distance_m": 687.0,
   "end_distance_m": 707.0,
   "midpoint_distance_m": 697.0,
   "start_elevation_m": 151.88868214436167,
   "end_elevation_m": 151.2503158244921,
   "start_xy": [
    1748022.8487425363,
    5430172.716668014
   ],
   "end_xy": [
    1748018.4235855844,
    5430153.24256239
   ]
  },
  "min_25m": {
   "gradient_pct": -3.2046657785997468,
   "start_distance_m": 684.0,
   "end_distance_m": 709.0,
   "midpoint_distance_m": 696.5,
   "start_elevation_m": 151.99211559912766,
   "end_elevation_m": 151.19094915447772,
   "start_xy": [
    1748023.3930844388,
    5430175.666870023
   ],
   "end_xy": [
    1748017.8414982294,
    5430151.329142856
   ]
  },
  "min_50m": {
   "gradient_pct": -2.6086169737822047,
   "start_distance_m": 661.0,
   "end_distance_m": 711.0,
   "midpoint_distance_m": 686.0,
   "start_elevation_m": 152.44943129406272,
   "end_elevation_m": 151.14512280717162,
   "start_xy": [
    1748025.0903234098,
    5430198.548654523
   ],
   "end_xy": [
    1748017.2594108745,
    5430149.415723323
   ]
  },
  "min_100m": {
   "gradient_pct": -1.305916782886925,
   "start_distance_m": 650.0,
   "end_distance_m": 750.0,
   "midpoint_distance_m": 700.0,
   "start_elevation_m": 152.61608347342917,
   "end_elevation_m": 151.31016669054225,
   "start_xy": [
    1748024.8168398447,
    5430209.396955907
   ],
   "end_xy": [
    1747990.7014212857,
    5430121.978453536
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 22.753160124815963,
   "start_distance_m": 964.0,
   "end_distance_m": 966.0,
   "midpoint_distance_m": 965.0,
   "start_elevation_m": 163.1305256787964,
   "end_elevation_m": 163.58558888129272,
   "start_xy": [
    1747849.3532532519,
    5430000.859807205
   ],
   "end_xy": [
    1747850.5935722163,
    5429999.290855687
   ]
  },
  "max_3m": {
   "gradient_pct": 22.81061760181255,
   "start_distance_m": 963.0,
   "end_distance_m": 966.0,
   "midpoint_distance_m": 964.5,
   "start_elevation_m": 162.90127035323835,
   "end_elevation_m": 163.58558888129272,
   "start_xy": [
    1747848.7330937698,
    5430001.644282964
   ],
   "end_xy": [
    1747850.5935722163,
    5429999.290855687
   ]
  }
 },
 "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": 0.176,
   "obstruction_max_height_m": 12.52,
   "flagged_windows_m": [
    2,
    3,
    5,
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "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-n2",
   "road_pbf": "block-batch-nz-n2.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": "sha256:1ffe0b32a690b9c1"
  },
  "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/BQ31.tiff"
  ],
  "calculated_at": "2026-09-28T05:12:02+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-nz-n2.osm.pbf",
  "osm_snapshot": "",
  "run_id": "nz-n2",
  "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": [
   "BQ31"
  ],
  "climb_origin": "discovered",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "structure_own_ways": 3,
  "carriageway": {
   "stations": 46,
   "stations_resolved": 46,
   "width_median_m": 8.25,
   "width_p10_m": 5.25,
   "width_min_m": 2.5,
   "width_max_m": 12.0,
   "bounded_share": 0.022,
   "unbounded_share": 0.978,
   "confidence_median": 0.0,
   "width_median_bounded_m": 2.5,
   "window_m": [
    953.0,
    978.0
   ],
   "width_at_max25_m": 6.75,
   "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": 46,
    "stations_resolved": 46,
    "width_median_m": 4.12,
    "width_p10_m": 1.25,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.696,
    "unbounded_share": 0.304,
    "confidence_median": 1.0,
    "width_median_bounded_m": 1.88,
    "window_m": [
     953.0,
     978.0
    ],
    "width_at_max25_m": 1.25,
    "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": "Wellington",
  "county": "Wellington",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}