Hen Gerrig (SH 950 187) – Welsh Highland Sub addition
There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Aled Williams.
LIDAR image of Hen Gerrig (SH 950 187) |
The criteria for the list that this addition applies to are:
Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams |
Extract from the Ordnance Survey 1:25,000 Explorer map |
When the initial P10 sub list was completed in June 2020 this hill was listed with an estimated c 9m of drop, based on a 518m summit height taken from the 1698ft (517.6m) height that appears on the Ordnance Survey series of Six-Inch maps, and an estimated c 509m bwlch height, based on interpolation of 5m contouring that appeared online.
The full details for the hill are:
Group: Esgeiriau
Gwynion
Name: Hen Gerrig
OS 1:50,000 map: 125
Summit Height: 518.1m (LIDAR)
Summit Grid Reference:
SH 95070 18770 (LIDAR)
Bwlch Height: 507.9m (LIDAR)
Bwlch Grid Reference:
SH 95012 18806 (LIDAR)
Drop: 10.2m (LIDAR)
For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru reported on Mapping Mountains please consult the following Change Registers:
Aled Williams and Myrddyn Phillips (September 2023)
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