Tuesday 22 April 2014

Mapping Mountains - Hill Reclassifications – Y Pedwarau


Carreg y Big (SN 902 909) - 400m Sub-Pedwar deletion

There has been a deletion of a 400m Sub-Pedwar by surveying with the Trimble.  The hill was only listed in this sub category as it has a 394m spot height at the bwlch and a 417m spot height at the summit on the Ordnance Survey enlarged mapping hosted on the Geograph website, with these values giving this hill a drop of 23m.  The spot height at the bwlch on the OS map is on a road, and the position of the critical bwlch is higher than this .  The name of the hill is Carreg y Big (SN 902 909) and is situated in the Pumlumon range.

The hill will be deleted from the Y Pedwarau list in the 2nd edition that will be hopefully be published by Europeaklist.  The list of Pedwar hills is also available from the Haroldstreet website.


The full details for the hill are:



Cardinal Hill:  Foel Fadian

Summit Height:  417.0m (converted to OSGM15)

Name:  Carreg y Big

OS 1:50,000 map:  136

Summit Grid Reference:  SN 902 909

Drop:  19.7m (converted to OSGM15)



The Trimble GeoXH 6000 on the summit of Carreg y Big
For details on the survey that deleted this hill from 400m Sub-Pedwar status please click {here}



Myrddyn Phillips and Aled Williams (April 2014)

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