{
 "ocl_version": "0.1.0",
 "name": "Marina Drive",
 "slug": "marina-drive",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 23.276220746654275,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 308.0,
   "end_distance_m": 310.0,
   "start_elevation_m": 36.19383894788267,
   "end_elevation_m": 36.65936336281575,
   "min_gradient_pct": -3.8566525337055957
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 23.082359144074378,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 308.0,
   "end_distance_m": 311.0,
   "start_elevation_m": 36.19383894788267,
   "end_elevation_m": 36.8863097222049,
   "min_gradient_pct": -1.1591290381327852
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.879236764453736,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 305.0,
   "end_distance_m": 310.0,
   "start_elevation_m": 35.51540152459307,
   "end_elevation_m": 36.65936336281575,
   "min_gradient_pct": -0.8985022816606936
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 22.680660398989758,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 305.0,
   "end_distance_m": 315.0,
   "start_elevation_m": 35.51540152459307,
   "end_elevation_m": 37.78346756449204,
   "min_gradient_pct": -0.3233264143485526
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 22.12746404420482,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 299.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 34.23583903475307,
   "end_elevation_m": 38.661331843594034,
   "min_gradient_pct": 0.1595923309669911
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.72612802821297,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 294.0,
   "end_distance_m": 319.0,
   "start_elevation_m": 33.22979983654079,
   "end_elevation_m": 38.661331843594034,
   "min_gradient_pct": 0.3554692312497192
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.383599611659378,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 292.0,
   "end_distance_m": 342.0,
   "start_elevation_m": 32.841435342832256,
   "end_elevation_m": 43.033235148661944,
   "min_gradient_pct": 2.256490411673038
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 18.855886326955932,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 264.0,
   "end_distance_m": 364.0,
   "start_elevation_m": 28.22857987434923,
   "end_elevation_m": 47.08446620130516,
   "min_gradient_pct": 4.8778449974769025
  }
 ],
 "shape": {
  "ascent_concentration": 0.39,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 187.0,
  "shape_class": "sustained"
 },
 "length_m": 365.39290916133973,
 "start_elevation_m": 2.6971705505606223,
 "end_elevation_m": 47.34796187843504,
 "endpoint_gain_m": 44.650791327874416,
 "overall_gradient_pct": 12.219939196509912,
 "accumulated_ascent_m": 44.87972285660959,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.879236764453736,
   "start_distance_m": 305.0,
   "end_distance_m": 310.0,
   "midpoint_distance_m": 307.5,
   "start_elevation_m": 35.51540152459307,
   "end_elevation_m": 36.65936336281575,
   "start_xy": [
    1686840.0473083649,
    5431350.204388459
   ],
   "end_xy": [
    1686841.3245809688,
    5431355.038493826
   ]
  },
  "max_10m": {
   "gradient_pct": 22.680660398989758,
   "start_distance_m": 305.0,
   "end_distance_m": 315.0,
   "midpoint_distance_m": 310.0,
   "start_elevation_m": 35.51540152459307,
   "end_elevation_m": 37.78346756449204,
   "start_xy": [
    1686840.0473083649,
    5431350.204388459
   ],
   "end_xy": [
    1686842.6018535728,
    5431359.872599193
   ]
  },
  "max_20m": {
   "gradient_pct": 22.12746404420482,
   "start_distance_m": 299.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 309.0,
   "start_elevation_m": 34.23583903475307,
   "end_elevation_m": 38.661331843594034,
   "start_xy": [
    1686838.0071232473,
    5431344.563001009
   ],
   "end_xy": [
    1686843.6236716558,
    5431363.739883486
   ]
  },
  "max_25m": {
   "gradient_pct": 21.72612802821297,
   "start_distance_m": 294.0,
   "end_distance_m": 319.0,
   "midpoint_distance_m": 306.5,
   "start_elevation_m": 33.22979983654079,
   "end_elevation_m": 38.661331843594034,
   "start_xy": [
    1686836.2884491782,
    5431339.867667213
   ],
   "end_xy": [
    1686843.6236716558,
    5431363.739883486
   ]
  },
  "max_50m": {
   "gradient_pct": 20.383599611659378,
   "start_distance_m": 292.0,
   "end_distance_m": 342.0,
   "midpoint_distance_m": 317.0,
   "start_elevation_m": 32.841435342832256,
   "end_elevation_m": 43.033235148661944,
   "start_xy": [
    1686835.6009795507,
    5431337.989533695
   ],
   "end_xy": [
    1686838.615473902,
    5431385.68340363
   ]
  },
  "max_100m": {
   "gradient_pct": 18.855886326955932,
   "start_distance_m": 264.0,
   "end_distance_m": 364.0,
   "midpoint_distance_m": 314.0,
   "start_elevation_m": 28.22857987434923,
   "end_elevation_m": 47.08446620130516,
   "start_xy": [
    1686813.5822371803,
    5431323.571440808
   ],
   "end_xy": [
    1686825.047422744,
    5431402.844857711
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -0.8985022816606936,
   "start_distance_m": 2.0,
   "end_distance_m": 7.0,
   "midpoint_distance_m": 4.5,
   "start_elevation_m": 2.7001476277105376,
   "end_elevation_m": 2.655222513627503,
   "start_xy": [
    1686804.5698528057,
    5431211.790517308
   ],
   "end_xy": [
    1686805.43948482,
    5431216.714310578
   ]
  },
  "min_10m": {
   "gradient_pct": -0.3233264143485526,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 2.6971705505606223,
   "end_elevation_m": 2.664837909125767,
   "start_xy": [
    1686804.222,
    5431209.821
   ],
   "end_xy": [
    1686805.855666032,
    5431219.685105441
   ]
  },
  "min_20m": {
   "gradient_pct": 0.1595923309669911,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 2.6971705505606223,
   "end_elevation_m": 2.7290890167540205,
   "start_xy": [
    1686804.222,
    5431209.821
   ],
   "end_xy": [
    1686806.881059778,
    5431229.626147239
   ]
  },
  "min_25m": {
   "gradient_pct": 0.3554692312497192,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 2.6971705505606223,
   "end_elevation_m": 2.786037858373052,
   "start_xy": [
    1686804.222,
    5431209.821
   ],
   "end_xy": [
    1686807.20496713,
    5431234.6156446105
   ]
  },
  "min_50m": {
   "gradient_pct": 2.256490411673038,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 2.6971705505606223,
   "end_elevation_m": 3.8254157563971414,
   "start_xy": [
    1686804.222,
    5431209.821
   ],
   "end_xy": [
    1686807.5562035418,
    5431259.610602013
   ]
  },
  "min_100m": {
   "gradient_pct": 4.8778449974769025,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 2.6971705505606223,
   "end_elevation_m": 7.575015548037525,
   "start_xy": [
    1686804.222,
    5431209.821
   ],
   "end_xy": [
    1686779.4012617436,
    5431298.107652133
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 23.276220746654275,
   "start_distance_m": 308.0,
   "end_distance_m": 310.0,
   "midpoint_distance_m": 309.0,
   "start_elevation_m": 36.19383894788267,
   "end_elevation_m": 36.65936336281575,
   "start_xy": [
    1686840.8136719272,
    5431353.10485168
   ],
   "end_xy": [
    1686841.3245809688,
    5431355.038493826
   ]
  },
  "max_3m": {
   "gradient_pct": 23.082359144074378,
   "start_distance_m": 308.0,
   "end_distance_m": 311.0,
   "midpoint_distance_m": 309.5,
   "start_elevation_m": 36.19383894788267,
   "end_elevation_m": 36.8863097222049,
   "start_xy": [
    1686840.8136719272,
    5431353.10485168
   ],
   "end_xy": [
    1686841.5800354895,
    5431356.0053149
   ]
  }
 },
 "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": 0.076,
   "obstruction_max_height_m": 7.65,
   "flagged_windows_m": []
  },
  "review": [],
  "extent": [
   "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-n1",
   "road_pbf": "block-batch-nz-n1.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:ff0dec6edae18a40"
  },
  "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/BQ29.tiff"
  ],
  "calculated_at": "2026-09-28T05:16:09+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-nz-n1.osm.pbf",
  "osm_snapshot": "",
  "run_id": "nz-n1",
  "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": [
   "BQ29"
  ],
  "climb_origin": "discovered",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "structure_own_ways": 1,
  "carriageway": {
   "stations": 21,
   "stations_resolved": 21,
   "width_median_m": 4.75,
   "width_p10_m": 3.75,
   "width_min_m": 2.75,
   "width_max_m": 10.25,
   "bounded_share": 0.333,
   "unbounded_share": 0.667,
   "confidence_median": 0.0,
   "width_median_bounded_m": 4.5,
   "window_m": [
    294.0,
    319.0
   ],
   "width_at_max25_m": 4.5,
   "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": 21,
    "stations_resolved": 21,
    "width_median_m": 4.5,
    "width_p10_m": 1.75,
    "width_min_m": 1.75,
    "width_max_m": 12.0,
    "bounded_share": 0.905,
    "unbounded_share": 0.095,
    "confidence_median": 1.0,
    "width_median_bounded_m": 3.75,
    "window_m": [
     294.0,
     319.0
    ],
    "width_at_max25_m": 5.75,
    "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": "Marlborough",
  "county": "Marlborough",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}