Kilmonivaig to Aonachan°
2119.0 m · net rise 81.7 m · total ascent 138.7 m · overall 3.9% · confidence: good · Highbridge · Highland
Shape: sustained — 42% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 91 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.
° The name is provisional: this climb is not yet matched to a documented name, so it was named from nearby map places. There is no evidence of local usage — (auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (56.8995, -4.9679)'). Corrections welcome.
≈ Overhead cover (tree canopy or structures) spans 19% 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) | ≈55% | 163–165 m | under overhead cover terrain reads 70.8% at 1580–1582 m across a structure — excluded |
| 3 m (diagnostic) | ≈50% | 162–165 m | under overhead cover terrain reads 61.6% at 1579–1582 m across a structure — excluded |
| 5 m | ≈42% | 177–182 m | under overhead cover |
| 10 m | ≈37% | 161–171 m | under overhead cover |
| 20 m | ≈28.5% | 152–172 m | under overhead cover |
| 25 m | ≈27.5% | 157–182 m | under overhead cover |
| 50 m | ≈22.1% | 133–183 m | under overhead cover |
| 100 m | ≈17.3% | 94–194 m | under overhead cover |
may_start_earlier 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:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/scotland/phase-1/dtm/NN18.tif",
"data/cache/scotland/phase-1/dtm/NN28.tif"
],
"calculated_at": "2026-08-18T18:40:36+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/scotland-2026-08-14-roads.osm.pbf",
"osm_snapshot": "2026-08-13T20:21:01Z",
"elevation_provider": "Scottish Remote Sensing Portal (AWS Open Data, srsp-open-data)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Scottish Government, SEPA and partners; Crown copyright",
"elevation_dataset": "Scottish Public Sector LiDAR Phase 1 1m",
"elevation_tile_ids": [
"NN18",
"NN28"
],
"route_summit_trim_m": 2714.3,
"route_summit_trim_loss_m": 35.5,
"climb_origin": "discovered",
"notes": "Coarse pass: max 14.5% over 200 m (Terrain 50), gain 43.0 m over 4756 m way. EXTENDED by graph walk: +0 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (Scotland launch 2026-08-18): qualified-steep. AUTO-NAMED from gazetteer (hypothesis, unreviewed): was 'Discovered lane (56.8995, -4.9679)'.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (56.8995, -4.9679)'"
}