Mapping Mountains – Hill Reclassifications – Welsh Highlands – Uchafion Cymru

Pt. 563.0m (SH 638 551) – 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 and its status subsequently confirmed by a Trimble GeoXH 6000 survey also conducted by Aled Williams. 

Pt. 563.0m (SH 638 551).  Photo: Aled Williams 

The criteria for the list that this addition applies to are:

Welsh Highlands – Uchafion Cymru – Welsh hills at or above 500m in height with 15m minimum drop, with an accompanying sub list entitled the Welsh Highland Subs, the criteria for which is all Welsh hills at or above 500m in height with 10m or more and below 15m of drop.  This list is authored by Myrddyn Phillips and Aled Williams with the Introduction to the list published on Mapping Mountains in November 2015 and the latest update relating to the list published on Mapping Mountains in January 2023.

Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams

The hill is being listed by the point (Pt. 563.0m) notation and it is adjoined to the Yr Wyddfa group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the A4086 road to its north and the A498 road to its east, and has the village of Llanberis towards the north-west.

Extract from the Ordnance Survey 1:25,000 Explorer map

It was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.  As this hill has now been surveyed with the Trimble GeoXH 6000, it is this result that is being prioritised.

Gathering data at the summit of Pt. 563.0m (SH 638 551).  Photo: Aled Williams

Gathering data at the bwlch of Pt. 563.0m (summit at SH 638 551).  Photo: Aled Williams

Therefore, the addition of this hill to Welsh Highland Sub status is due to LIDAR analysis, with its status confirmed from a subsequent Trimble GeoXH 6000 survey, resulting in a 563.0m summit height and a 552.8m bwlch height, with these values giving this hill 10.2m of drop, which is sufficient for it to be classified as a Welsh Highland Sub. 

 

The full details for the hill are: 

Group:  Yr Wyddfa

Name:  Pt. 563.0m

OS 1:50,000 map:  115

Summit Height:  563.0m (converted to OSGM15)

Summit Grid Reference:  SH 63821 55162

Bwlch Height:  552.8m (converted to OSGM15)

Bwlch Grid Reference:  SH 63750 55175    

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:

 

Welsh Highland P15s

 

Welsh Highland Subs

 

Aled Williams and Myrddyn Phillips (June 2023)