Saturday, 24 October 2015

Mapping Mountains – Summit Relocations – Y Pedwarau

Cerrig y Gordref (SH 929 428)

This is the twentieth post under the heading of Summit Relocations, with the survey that resulted in the following details taking place on 2nd October 2015.

The twentieth major summit relocation initiated from a survey with the Trimble GeoXH 6000 was conducted in the hills of the Arennig, in the company of Aled Williams who had suggested the walk.

The name of the hill is Cerrig y Gordref and it is situated to the north of Y Bala and is of an equal distance south south-west of Cerrigydrudion, and is positioned in part of the Arennig hills with it being also associated with its Cardinal Hill, which is Foel Goch.

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 this hill as land approximately 100 metres west from where the 497m spot height appears on the ground is higher.  Both positions were surveyed with the westerly position being 3.8m higher according to the Trimble data.

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 map that appears 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

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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