Mapping Mountains – Hill Reclassifications – The Welsh P15s

Cae Tŷ (SJ 077 107) – Welsh Sub-P15 deletion 

There has been a deletion to the list of The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Cae Tŷ (SJ 077 107)

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

The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10^th May 2019. 

The Welsh P15s by Myrddyn Phillips

The name the hill is now listed by is Cae Tŷ, and this was derived from the Tithe map, and it is adjoined to the Esgeiriau Gwynion group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned encircled by minor roads, with the B4382 road farther to its north-east, the A458 road farther to its south-west and the A495 road farther to its south-east and has the town of Llanfair Caereinion towards the south-east.

When the listing that became known as The Welsh P15s was being compiled, this hill was included in the P14 sub list with an estimated c 14m of drop, based on the 208m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and an estimated c 194m bwlch height, based on interpolation of 10m contouring between 190m – 200m. 

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

However, 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.

Therefore, the deletion of this hill from Welsh Sub-P15 status is due to LIDAR analysis, resulting in a 208.5m summit height and a 196.7m bwlch height, with these values giving this hill 11.8m 0f drop, which is insufficient for it to be classified as a Welsh Sub-P15. 

 

The full details for the hill are: 

Group:  Esgeiriau Duon 

Name:  Cae Tŷ 

OS 1:50,000 map:  125

Summit Height:  208.5m (LIDAR)                                                           

Summit Grid Reference:  SJ 07741 10751 (LIDAR)                                                  

Bwlch Height:  196.7m (LIDAR) 

Bwlch Grid Reference:  SJ 07212 10935 (LIDAR) 

Drop:  11.8m (LIDAR) 

 

Myrddyn Phillips (May 2025)