Monday, 12 January 2015

Mapping Mountains – Hill Reclassifications – 300m Twmpau


Pen y Gaer (SO 139 976) - 200m Twmpau reclassified to 300m Twmpau 

There has been a new addition to the 300m Twmpau list due to a survey with the Trimble GeoXH 6000.  The evidence for the promotion of this hill is marginal, but until more accurate information is at hand the hill has been reclassified from the ranks of the 200m Twmpau to that of the 300m Twmpau list.


The raw processed survey result is 300.002m converted to OSGM15

The margin of uncertainty for the height in relation to the position of the Trimble on the summit is 0.05m.

The precision of the equipment is +/- 0.15m.

The accuracy of the equipment is 0.1m.

Therefore the raw result should be rounded to one decimal place; 300.0m


The name of the hill is Pen y Gaer (SO 139 976) and it is situated in the Carnedd Wen range of hills and is positioned between the small communities of Betws Cedewain and Pentrellifior.


The full details for the hill are:

Cardinal Hill:  Carnedd Wen

Summit Height:  300.0m (converted to OSGM15)

Name:  Pen y Gaer

OS 1:50,000 map:  136

Summit Grid Reference:  SO 139 976

Drop:  88m


Pen y Gaer (SO 139 976) the new 300m Twmpau
For details on the survey that reclassified this hill to 300m Twmpau status please click {here}


Myrddyn Phillips (January 2015)


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