BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Report it (photos welcome).

Glamorgan Street

1147.5 m · gain 112.7 m · overall 9.8% · Penrhiwceiber · Rhondda Cynon Taf

Shape: sustained — 34% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 177 m.

An unlisted find of this survey, on no list we know of. It was discovered by analysing LiDAR terrain data and cross-checked against the OS road network, surface models and map tags — but despite all that, 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 that someone is you, 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 7% 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, not wrong. Longer windows average over more clean ground and are steadier.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	24.8%	1135–1137 m
3 m (diagnostic)	24.1%	1135–1138 m
5 m	24.1%	1132–1137 m
10 m	23.6%	1132–1142 m
20 m	22.3%	1127–1147 m
25 m	21.7%	1122–1147 m
50 m	16.2%	990–1040 m
100 m	15.4%	987–1087 m

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

Glamorgan Street LiDAR hillshade map with contours

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_5_305196_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_305197_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_306196_20201224dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_5_306197_20201224dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:10:28+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_5_305196_20201224dtm.tif",
    "wg_del_5_305197_20201224dtm.tif",
    "wg_del_5_306196_20201224dtm.tif",
    "wg_del_5_306197_20201224dtm.tif"
  ],
  "elevation_capture_dates": [
    "24-12-2020"
  ],
  "climb_origin": "discovered",
  "notes": "Coarse pass: max 13.1% over 200 m (Terrain 50), gain 83.9 m over 702 m way. EXTENDED by graph walk: +4 segment(s) at base, +1 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting. ADOPTED (notable slice 2026-08-11): clean-steep."
}