Lane near Dolanog°
3249.0 m · net rise 41.6 m · total ascent 132.1 m · overall 1.3% · confidence: good · Dolanog · Powys
Shape: stepped — 54% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 114 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 (52.6949, -3.3717)'). Corrections welcome.
≈ Overhead cover (tree canopy or structures) spans 18% 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) | ≈33% | 427–429 m | under overhead cover terrain reads 91.8% at 1–3 m across a structure — excluded |
| 3 m (diagnostic) | ≈27% | 425–428 m | under overhead cover terrain reads 91.3% at 0–3 m across a structure — excluded |
| 5 m | ≈26% | 424–429 m | under overhead cover terrain reads 74.9% at 0–5 m across a structure — excluded |
| 10 m | ≈22% | 419–429 m | under overhead cover terrain reads 35.5% at 0–10 m across a structure — excluded |
| 20 m | ≈20.7% | 419–439 m | under overhead cover |
| 25 m | 20.5% | 2294–2319 m | |
| 50 m | ≈18.5% | 400–450 m | under overhead cover |
| 100 m | ≈15.5% | 374–474 m | under overhead cover |
may_start_earlierdescends_at_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:27700",
"elevation_resolution_m": 1.0,
"elevation_tiles": [
"data/cache/wales/dtm_1m/wg_del_13_306310_20210222dtm.tif",
"data/cache/wales/dtm_1m/wg_del_13_307310_20210222dtm.tif",
"data/cache/wales/dtm_1m/wg_del_8_306311_20210222dtm.tif",
"data/cache/wales/dtm_1m/wg_del_8_306312_20210222dtm.tif",
"data/cache/wales/dtm_1m/wg_del_8_307311_20210222dtm.tif",
"data/cache/wales/dtm_1m/wg_del_8_307312_20210222dtm.tif"
],
"calculated_at": "2026-08-12T01:20:05+00:00",
"road_source": "OpenStreetMap (local PBF extract)",
"road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
"osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
"osm_snapshot": "2026-08-10T20:21:40Z",
"elevation_provider": "Welsh Government",
"elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
"elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
"elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
"elevation_tile_ids": [
"wg_del_13_306310_20210222dtm.tif",
"wg_del_13_307310_20210222dtm.tif",
"wg_del_8_306311_20210222dtm.tif",
"wg_del_8_306312_20210222dtm.tif",
"wg_del_8_307311_20210222dtm.tif",
"wg_del_8_307312_20210222dtm.tif"
],
"elevation_capture_dates": [
"16-03-2021",
"22-02-2021"
],
"climb_origin": "discovered",
"notes": "Coarse pass: max 12.9% over 200 m (Terrain 50), gain 38.6 m over 3222 m way. EXTENDED by graph walk: +1 segment(s) at base, +0 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting.",
"naming_note": "auto-named from gazetteer (hypothesis, unreviewed); discovered as 'Discovered lane (52.6949, -3.3717)'"
}