Mapping Mountains – Hill Reclassifications – Y Trichant – The 300m Hills of Wales

Pt. 370.8m (SJ 195 581) – Trichant reclassified to Sub-Trichant

There has been a reclassification to the list of Y Trichant – The 300m Hills of Wales, 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 Pt. 370.8m (SJ 195 581)

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

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is being listed by the point (Pt. 370.8m) notation as an appropriate name for it either through local enquiry and / or historic research has not been found by the author, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north and south-east and the B5430 road to its west, and has the village of Llanarmon-yn-Iâl towards the south. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list with an estimated c 370m summit height. 

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

After the P30 lists were standardised, and interpolated heights and drop values also included, the details for this hill were re-assessed and it was listed with an estimated c 31m of drop based on the 370m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 339m bwlch height based on interpolation of 5m contouring between 335m – 340m. 

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 reclassification of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 370.8m summit height and a 341.2m bwlch height, with these values giving this hill 29.6m of drop, which is insufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Pt. 370.8m 

OS 1:50,000 map:  116

Summit Height:  370.8m (LIDAR)                                                           

Summit Grid Reference:  SJ 19584 58152 (LIDAR) 

Bwlch Height:  341.2m (LIDAR) 

Bwlch Grid Reference:  SJ 19854 58246 (LIDAR) 

Drop:  29.6m (LIDAR) 

 

Myrddyn Phillips (April 2021)