Mapping Mountains – Summit Relocations – 100m Twmpau

Wynnstay Park (SJ 310 429) 

There has been a Summit Relocation to a hill that was originally surveyed for 100m Twmpau (thirty welsh metre prominences and upward) status, and which was initiated by a survey with the Trimble GeoXH 6000 and confirmed by subsequent LIDAR analysis, with these details retrospective as the survey that resulted in this summit relocation was conducted on the 20^th October 2015.

LIDAR image of Wynnstay Park (SJ 310 429)

The survey was conducted in the eastern part of the Moel y Gamelin range of hills, on the south-eastern outskirts of Rhiwabon (Ruabon), with the hill being situated on the old country estate of the Wynn family; the estate house has now been converted to flats and private houses.  Access to the hill is easy from the north as a paved road leads to its summit.  Parking can either be found adjacent to Broth Lodge at the entrance to the old estate or if wanting a quick visit a car can be driven up the road and parked within 100 metres of the high point of the hill.

The name of the hill is Wynnstay Park and prior to the survey with the Trimble GeoXH 6000 the summit position was listed as SJ 310 430, this is where the 141m spot height appears on the Ordnance Survey 1:25,000 Explorer map.  However, the Trimble set-up position was south south-westward from where the spot height appears on the ground, and with LIDAR giving the summit position as SJ 31001 42958.

Therefore, the position of the summit is at SJ 31001 42958 and is beside a fence next to the road that makes its way toward the old estate house.  This position is not given a spot height on contemporary Ordnance Survey maps although it is close to where the 141m spot height appears.

 

The full details for the hill are:

Group:  Moel y Gamelin

Name:  Wynnstay Park

OS 1:50,000 map:  117

Summit Height:  141.2m (LIDAR)

Summit Grid Reference (New Position):  SJ 31001 42958 (LIDAR)

   

Bwlch Height:  128.2m (LIDAR)

Bwlch Grid Reference:  SJ 31418 43293 (LIDAR

Drop:  13.0m (LIDAR)

The summit area of Wynnstay Park

For details on the summit survey of Wynnstay Park

Myrddyn Phillips (October 2015)