Wednesday, 8 July 2015

Mapping Mountains – Summit Relocations – Y Pedwarau

Mynydd Poeth (SH 953 513)

There has been a Summit Relocation initiated by a survey with the Trimble GeoXH 6000 to the lsting of the Y Pedwarau.  The Y Pedwarau are the 400m hills of Wales that have 30m minimum drop, with the following details being retrospective as the survey that resulted in this summit relocation was conducted on 24th December 2014.

The survey was conducted in the hills of Mynydd Hiraethog and the hill is situated midway between the small town of Cerrigydrudion to its south and the Alwen Reservoir to its north, the hill was surveyed in the company of Mark Trengove on Christmas Eve before Santa brought the pressies.

The name of the hill is Mynydd Poeth and prior to the survey with the Trimble GeoXH 6000 the hill was listed as a 400m Sub-Pedwar and was reclassified to Pedwar status through the same survey that resulted in its summit relocation.  When Mynydd Poeth was listed as a 400m Sub-Pedwar its summit position was given to where the 417m spot height appears on current Ordnance Survey maps, this position is at SH 95403 51068 and is southward from where the actual summit of the hill is situated.

This hill's new summit is positioned approximately 230 metres northward from where the 417m spot height appears on current Ordnance Survey maps.  This new position has no summit spot height on any map.

The full details for the hill are:

Cardinal Hill:  Mwdwl Eithin

Summit Height:  419.3m (converted to OSGM15)

Name:  Mynydd Poeth

OS 1:50,000 map:  116

Summit Grid Reference (New Position):  SH 95375 51301 
Drop:  31.7m (converted to OSGM15)

The Trimble GeoXH 6000 gathering data at the new summit position of Mynydd Poeth, with the old position of the summit just beyond the far right of this photo

For details on the survey that relocated the summit of this hill please click {here}

Myrddyn Phillips and Aled Williams (December 2014)

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