Arthur's Pass from Jacksons
24895.5 m · net rise 716.9 m · total ascent 922.3 m · overall 2.9% · evidence quality B (good) · West Coast · West Coast · share
Shape: stepped — 62% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 516 m.
Not yet matched against documented climbs — the measurement stands on its own.
≈ Overhead cover (tree canopy or structures) spans 6% of this route — detected by comparing the surface model (DSM, treetops and rooftops) against the terrain model (DTM, bare ground). Under cover the bare-ground model is built from fewer laser returns, so metre-scale readings can wobble; maxima whose window sits in a covered zone are marked ≈ below — less certain — the flag does not say whether the true value is higher or lower. Longer windows average over more clean ground and are steadier.
Gradient ladder what do windows mean?
| Window | Maximum | Located at | |
|---|---|---|---|
| 2 m (diagnostic) | ≈40% | 13575–13577 m | under overhead cover terrain reads 310.2% at 21307–21309 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 3 m (diagnostic) | ≈29% | 13574–13577 m | under overhead cover terrain reads 308.6% at 21306–21309 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 5 m | ≈24% | 8565–8570 m | under overhead cover terrain reads 272.8% at 21305–21310 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 10 m | ≈18% | 8564–8574 m | under overhead cover terrain reads 149.1% at 21302–21312 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 20 m | ≈17.4% | 21910–21930 m | under overhead cover terrain reads 104.6% at 22546–22566 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 25 m | ≈17.3% | 21904–21929 m | under overhead cover terrain reads 93.4% at 22542–22567 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 50 m | ≈17.3% | 21880–21930 m | under overhead cover terrain reads 59.4% at 22540–22590 m across a structure and terrain that holds no road surface (dense canopy, no bench) — excluded |
| 100 m | ≈16.6% | 21868–21968 m | under overhead cover terrain reads 36.9% at 22528–22628 m across a structure — excluded |
Map
Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap
This climb's data: OCL JSON — the full gradient ladder, quality flags and provenance in the OpenClimb Ladder format.
Surface: paved throughout, according to LINZ Topo50 road centrelines.
Access: Listed 2026-09-28 (inventory hunt wave 1): road audit — barrier swing_gate (yes) 0.0 m off route. Never silently ranked or dropped (Peter, 2026-08-27).
Measured, not vetted. This page records what the laser record shows about the road's shape — nothing more. Nobody has necessarily ridden or inspected this road for the survey, and a page here is not a recommendation and no guarantee that the road is open, surfaced, rideable or safe. Gates, private sections, missing rights of way and hazards do not show up in elevation data. Check access and conditions on the ground and make your own judgment.
Ridden it, or know better? Submit data for this climb no account needed · Share this climb
Route colour = gradient over a 25 m window: <10% 10–20% 20–25% ≥25%
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
The map, profile and gradient chart share one position — move your pointer over them and the marker follows. Colors are the gradient bands; the shaded span is the steepest 25 m. Any 25 m figure is good to about a point either way (why).
Measurement card
| Elevation | LINZ nz-elevation — New Zealand 1 m DEM/DSM national LiDAR mosaic — Toitū Te Whenua Land Information New Zealand (LINZ), vertical datum NZVD2016 (LINZ documentation; not re-verified against a benchmark) |
|---|---|
| Resolution / CRS | 1.0 m grid, EPSG:2193; sampled every 1.0 m, bilinear interpolation |
| Tiles | BU20, BV20 |
| Road centreline | OpenStreetMap (local PBF extract) |
| Quality status | evidence quality B; caveated windows: canopy or structure, no bench excluded, no bench excluded min, structure excluded, structure excluded min |
| Analysis | OCL 0.1.0, analysis 0.1.0, run nz-s2, calculated 2026-09-28 |
Provenance
{
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"calculated_at": "2026-09-28T05:19:22+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
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"run_id": "nz-s2",
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"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",
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"elevation_tile_ids": [
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"climb_origin": "named-pass",
"seam_filled_samples": {
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"mask_basin_extension_m": 75.0,
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"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,
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