{
 "ocl_version": "0.1.0",
 "name": "Salt River View Road",
 "slug": "salt-river-view-road",
 "confidence": "A",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 33.184904548324745,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 203.0,
   "end_distance_m": 205.0,
   "start_elevation_m": 27.420488803143908,
   "end_elevation_m": 28.084186894110402,
   "min_gradient_pct": -8.286145819939295
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 33.40264061264394,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 203.0,
   "end_distance_m": 206.0,
   "start_elevation_m": 27.420488803143908,
   "end_elevation_m": 28.422568021523226,
   "min_gradient_pct": -6.5900960840626395
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 31.964195580597874,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 202.0,
   "end_distance_m": 207.0,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 28.715082187558437,
   "min_gradient_pct": -5.879360316354019
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 29.107919223917236,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 202.0,
   "end_distance_m": 212.0,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 30.027664330920267,
   "min_gradient_pct": -5.07093601459542
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 24.06799837687597,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 198.0,
   "end_distance_m": 218.0,
   "start_elevation_m": 26.423096003892773,
   "end_elevation_m": 31.236695679267967,
   "min_gradient_pct": -2.2885389870537076
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 22.86198418081912,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 202.0,
   "end_distance_m": 227.0,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 32.832368453733324,
   "min_gradient_pct": -1.0659054058285928
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.442423267436574,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 176.0,
   "start_elevation_m": 12.498595153489912,
   "end_elevation_m": 22.7198067872082,
   "min_gradient_pct": 2.4204628920515594
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 20.154247013694008,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 126.0,
   "end_distance_m": 226.0,
   "start_elevation_m": 12.498595153489912,
   "end_elevation_m": 32.65284216718392,
   "min_gradient_pct": 6.558023186106093
  }
 ],
 "shape": {
  "ascent_concentration": 0.37,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 286.0,
  "shape_class": "sustained"
 },
 "length_m": 501.55458525274463,
 "start_elevation_m": 3.212801133839355,
 "end_elevation_m": 68.08801012021873,
 "endpoint_gain_m": 64.87520898637938,
 "overall_gradient_pct": 12.934825220207546,
 "accumulated_ascent_m": 65.74440814711042,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 31.964195580597874,
   "start_distance_m": 202.0,
   "end_distance_m": 207.0,
   "midpoint_distance_m": 204.5,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 28.715082187558437,
   "start_xy": [
    1723257.2587299438,
    5993296.551295079
   ],
   "end_xy": [
    1723258.0921325793,
    5993291.6212403085
   ]
  },
  "max_10m": {
   "gradient_pct": 29.107919223917236,
   "start_distance_m": 202.0,
   "end_distance_m": 212.0,
   "midpoint_distance_m": 207.0,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 30.027664330920267,
   "start_xy": [
    1723257.2587299438,
    5993296.551295079
   ],
   "end_xy": [
    1723257.899672126,
    5993286.644465081
   ]
  },
  "max_20m": {
   "gradient_pct": 24.06799837687597,
   "start_distance_m": 198.0,
   "end_distance_m": 218.0,
   "midpoint_distance_m": 208.0,
   "start_elevation_m": 26.423096003892773,
   "end_elevation_m": 31.236695679267967,
   "start_xy": [
    1723255.1534587012,
    5993299.692731463
   ],
   "end_xy": [
    1723257.441479454,
    5993280.661985706
   ]
  },
  "max_25m": {
   "gradient_pct": 22.86198418081912,
   "start_distance_m": 202.0,
   "end_distance_m": 227.0,
   "midpoint_distance_m": 214.5,
   "start_elevation_m": 27.116872408528543,
   "end_elevation_m": 32.832368453733324,
   "start_xy": [
    1723257.2587299438,
    5993296.551295079
   ],
   "end_xy": [
    1723255.8233222775,
    5993271.817293657
   ]
  },
  "max_50m": {
   "gradient_pct": 20.442423267436574,
   "start_distance_m": 126.0,
   "end_distance_m": 176.0,
   "midpoint_distance_m": 151.0,
   "start_elevation_m": 12.498595153489912,
   "end_elevation_m": 22.7198067872082,
   "start_xy": [
    1723185.8383456315,
    5993314.015126727
   ],
   "end_xy": [
    1723234.7642267935,
    5993306.573152652
   ]
  },
  "max_100m": {
   "gradient_pct": 20.154247013694008,
   "start_distance_m": 126.0,
   "end_distance_m": 226.0,
   "midpoint_distance_m": 176.0,
   "start_elevation_m": 12.498595153489912,
   "end_elevation_m": 32.65284216718392,
   "start_xy": [
    1723185.8383456315,
    5993314.015126727
   ],
   "end_xy": [
    1723256.0210346037,
    5993272.797553742
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -5.879360316354019,
   "start_distance_m": 3.0,
   "end_distance_m": 8.0,
   "midpoint_distance_m": 5.5,
   "start_elevation_m": 3.0593579265514146,
   "end_elevation_m": 2.7653899107337137,
   "start_xy": [
    1723206.7917853151,
    5993411.345906833
   ],
   "end_xy": [
    1723202.2314275072,
    5993409.295751556
   ]
  },
  "min_10m": {
   "gradient_pct": -5.07093601459542,
   "start_distance_m": 0.0,
   "end_distance_m": 10.0,
   "midpoint_distance_m": 5.0,
   "start_elevation_m": 3.212801133839355,
   "end_elevation_m": 2.705707532379813,
   "start_xy": [
    1723209.528,
    5993412.576
   ],
   "end_xy": [
    1723200.4072843841,
    5993408.475689445
   ]
  },
  "min_20m": {
   "gradient_pct": -2.2885389870537076,
   "start_distance_m": 0.0,
   "end_distance_m": 20.0,
   "midpoint_distance_m": 10.0,
   "start_elevation_m": 3.212801133839355,
   "end_elevation_m": 2.7550933364286134,
   "start_xy": [
    1723209.528,
    5993412.576
   ],
   "end_xy": [
    1723191.2865687683,
    5993404.375378888
   ]
  },
  "min_25m": {
   "gradient_pct": -1.0659054058285928,
   "start_distance_m": 0.0,
   "end_distance_m": 25.0,
   "midpoint_distance_m": 12.5,
   "start_elevation_m": 3.212801133839355,
   "end_elevation_m": 2.9463247823822067,
   "start_xy": [
    1723209.528,
    5993412.576
   ],
   "end_xy": [
    1723186.7262109604,
    5993402.325223611
   ]
  },
  "min_50m": {
   "gradient_pct": 2.4204628920515594,
   "start_distance_m": 0.0,
   "end_distance_m": 50.0,
   "midpoint_distance_m": 25.0,
   "start_elevation_m": 3.212801133839355,
   "end_elevation_m": 4.423032579865135,
   "start_xy": [
    1723209.528,
    5993412.576
   ],
   "end_xy": [
    1723171.5560654763,
    5993382.730306012
   ]
  },
  "min_100m": {
   "gradient_pct": 6.558023186106093,
   "start_distance_m": 0.0,
   "end_distance_m": 100.0,
   "midpoint_distance_m": 50.0,
   "start_elevation_m": 3.212801133839355,
   "end_elevation_m": 9.770824319945447,
   "start_xy": [
    1723209.528,
    5993412.576
   ],
   "end_xy": [
    1723170.1503869689,
    5993333.695941338
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 33.184904548324745,
   "start_distance_m": 203.0,
   "end_distance_m": 205.0,
   "midpoint_distance_m": 204.0,
   "start_elevation_m": 27.420488803143908,
   "end_elevation_m": 28.084186894110402,
   "start_xy": [
    1723257.425410471,
    5993295.5652841255
   ],
   "end_xy": [
    1723257.758771525,
    5993293.593262217
   ]
  },
  "max_3m": {
   "gradient_pct": 33.40264061264394,
   "start_distance_m": 203.0,
   "end_distance_m": 206.0,
   "midpoint_distance_m": 204.5,
   "start_elevation_m": 27.420488803143908,
   "end_elevation_m": 28.422568021523226,
   "start_xy": [
    1723257.425410471,
    5993295.5652841255
   ],
   "end_xy": [
    1723257.9254520521,
    5993292.607251262
   ]
  }
 },
 "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": 0.042,
   "obstruction_max_height_m": 6.32,
   "flagged_windows_m": []
  },
  "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-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/AY30.tiff"
  ],
  "calculated_at": "2026-09-28T04:55:19+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": [
   "AY30"
  ],
  "climb_origin": "discovered",
  "seam_filled_samples": {
   "count": 0,
   "distances_m": []
  },
  "seam_filled_in_maximum": false,
  "structure_own_ways": 2,
  "carriageway": {
   "stations": 27,
   "stations_resolved": 27,
   "width_median_m": 5.25,
   "width_p10_m": 3.4,
   "width_min_m": 2.0,
   "width_max_m": 12.0,
   "bounded_share": 0.0,
   "unbounded_share": 1.0,
   "confidence_median": 0.0,
   "window_m": [
    202.0,
    227.0
   ],
   "width_at_max25_m": 4.25,
   "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": 27,
    "stations_resolved": 27,
    "width_median_m": 10.75,
    "width_p10_m": 6.05,
    "width_min_m": 1.25,
    "width_max_m": 12.0,
    "bounded_share": 0.407,
    "unbounded_share": 0.593,
    "confidence_median": 0.0,
    "width_median_bounded_m": 8.5,
    "window_m": [
     202.0,
     227.0
    ],
    "width_at_max25_m": 11.0,
    "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": "Rodney",
  "county": "Northland",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}