Whiterock Road
750.7 m · net rise 96.6 m · overall 12.9% · confidence: good · Belfast · County Antrim
Shape: sustained — 38% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 197 m.
Found purely from mapping and LiDAR data, and not yet matched against books, race records or lists — it may be well known to locals under a name we've never heard. It was cross-checked against the OS road network, surface models and map tags, but a discovery can still be an artifact of the terrain model or the map. Treat it as a well-evidenced hypothesis until someone has ridden it. If you know this road, tell us what you found — photographs, corrections and local knowledge all welcome; the map links below let you scout it first.
≈ Overhead cover (tree canopy or structures) spans 8% 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) | ≈44% | 630–632 m | under overhead cover |
| 3 m (diagnostic) | ≈41% | 630–633 m | under overhead cover |
| 5 m | ≈39% | 628–633 m | under overhead cover |
| 10 m | ≈35% | 628–638 m | under overhead cover |
| 20 m | ≈32.8% | 619–639 m | under overhead cover |
| 25 m | ≈31.3% | 616–641 m | under overhead cover |
| 50 m | ≈27.1% | 611–661 m | under overhead cover |
| 100 m | ≈24.2% | 598–698 m | under overhead cover |
may_continue_beyond_end Extent detection suggests reviewing where this climb starts/ends.
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.
Ridden it, or know better? Submit data for this climb no account needed
© OpenStreetMap contributors · topo tiles © OpenTopoMap (CC-BY-SA) · vector tiles OpenFreeMap
Profile
Provenance
{
"analysis_version": "0.1.0",
"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:29902",
"elevation_resolution_m": 0.5,
"elevation_tiles": [
"data/cache/ni/belfast-city-2006/dtm/329373.asc",
"data/cache/ni/belfast-city-2006/dtm/329374.asc",
"data/cache/ni/belfast-city-2006/dtm/330373.asc",
"data/cache/ni/belfast-city-2006/dtm/330374.asc"
],
"calculated_at": "2026-08-19T00:22:18+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "/root/ni-survey/ireland-and-northern-ireland-2026-08-18.osm.pbf",
"osm_snapshot": "2026-08-17T20:21:36Z",
"elevation_provider": "OpenDataNI (OSNI / DfI Rivers River Basin LiDAR)",
"elevation_licence": "Open Government Licence v3 \u2014 Crown copyright; Belfast City 2006 data \u00a9 Cyient Europe Ltd, published as open data by DfI",
"elevation_dataset": "DfI Rivers Belfast City LiDAR 0.5 m DTM/DSM (March 2006)",
"elevation_tile_ids": [
"329373",
"329374",
"330373",
"330374"
],
"elevation_attribution_extra": "Derived data \u00a9 Cyient Europe Ltd (published as open data by DfI)",
"climb_origin": "discovered",
"notes": "EXTENDED by graph walk: +5 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Adopted 2026-08-18 (NI launch set \u2014 see docs/ni-coverage-survey.md)."
}