Saturday, 24 October 2015

Mapping Mountains – Summit Relocations – Y Pedwarau


Cerrig y Gordref (SH 929 428)

There has been a Summit Relocation to the listing of Y Pedwarau initiated by a survey with the Trimble GeoXH 6000, with the survey that resulted in the following details taking place on 2nd October 2015.

The Y Pedwarau are the 400m hills of Wales that have a minimum drop of 30m, accompanying the main Y Pedwarau list are a series of sub lists, with this hill being listed as a 400m Sub-Pedwar, these are the 400m hills of Wales that have 20m or more and below 30m of drop.

The hill is situated in the Arenig range and it was surveyed in the company of Aled Williams, who had suggested the walk.  The hill is positioned to the north of Y Bala and is of an equal distance south south-west of Cerrigydrudion, with its Cardinal Hill being Foel Goch.

The name of the hill is Cerrig y Gordref  and the hill is listed in the Y Pedwarau (Europeaklist May 2013) as a 400m Sub-Pedwar with 28m of drop, with its summit position given as SH 930 428 which is the position of the 497m spot height that appears on current Ordnance Survey maps.  However, this position is not the high point of the hill as land approximately 100 metres to the west is higher.  Both positions were surveyed with the Trimble GeoXH 6000 resulting in the westerly position being 3.8m higher.

The position of the relocated summit is at SH 92971 42820 and is the top of featureless ground that mainly consists of moor grass, this position is given a spot height of 495m on the Ordnance Survey enlarged mapping hosted on the Geograph website.


The full details for the hill are:

Cardinal Hill:  Foel Goch

Summit Height:  494.6m (converted to OSGM15)

Name:  Cerrig y Gordref

OS 1:50,000 map:  125

Summit Grid Reference (New Position):  SH 92971 42820 
 
Drop:  26.0m (converted to OSGM15)


The Trimble GeoXH 6000 gathering data at the new summit position of Cerrig y Gordref, with the old position of the summit to the right of Aled (wearing red) on this photograph

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

Myrddyn Phillips and Aled Williams (October 2015)



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