Mapping Mountains – Hill Reclassifications – The Welsh P15s

 

Felin Wynt (SH 608 811) – Welsh Sub-P15 addition

There has been an addition 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 detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Felin Wynt (SH 608 811)

The criteria for the list that this addition 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 listed by is Felin Wynt and this was derived from the Tithe map and it is adjoined to the Ynys Môn 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 coast to its north and with minor roads to its west, south and east, and has the small community of Glan-yr-afon towards the west south-west. 

When the listing that became known as The Welsh P15s was being compiled, this hill was not included in the P14 sub list and was listed with 13m of drop, based on the 94m summit and 81m bwlch spot heights that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map. 

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 addition of this hill to Welsh Sub-P15 status is due to LIDAR analysis and detail on contemporary maps produced from Ordnance Survey data, resulting in a 95.2m summit height and an 81m bwlch height with these values giving this hill 14m of drop, which is sufficient for it to be classified as a Welsh Sub-P15. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Felin Wynt 

OS 1:50,000 map:  114, 115

Summit Height:  95.2m (LIDAR)                                                           

Summit Grid Reference:  SH 60835 81107 (LIDAR) 

Bwlch Height:  81m (spot height) 

Bwlch Grid Reference:  SH 61129 80980 (spot height) 

Drop:  14m (LIDAR summit and spot height bwlch) 

 

Myrddyn Phillips (June 2021)