Pt. 442.9m (SN 945 643) – 400m Sub-Pedwar addition
There has been an addition to the listing of Y Pedwarau due to analysis of LIDAR data
by Aled Williams. Y Pedwarau is the title for the list of 400m hills of Wales and
takes in all Welsh hills at or above 400m and below 500m in height that have a
minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips
and Aled Williams and it commenced publication on Mapping Mountains on the
30.01.17.
Accompanying the main Y
Pedwarau list are five categories of sub hills, with this hill being included
in the 400m Sub-Pedwar category. The
criteria for 400m Sub-Pedwar
qualification is all Welsh hills at or above 400m and below 500m in height with
20m or more and below 30m of drop.
Prior to analysis of LIDAR data the hill was not
classified as its uppermost 430m ring contour that appears on the Ordnance
Survey 1:50,000 Landranger and 1:25,000 Explorer maps and bwlch contouring
between 420m – 430m did not even warrant it an estimated P14m.
The hill is situated in the Elenydd range with its
Cardinal Hill being Gorllwyn (SN 917 590), and is placed in the Region of Mid
and West Wales (Region B, Sub-Region B2), and is positioned above the small
community of the Elan Village to its north-west and Llanwrthwl to its east
south-east.
The summit of the hill is a part of designated
open access land and has public footpaths approaching it from the north,
south-west, south and south-east, all of which bisect with the open access
land.
The name of the hill is being listed under the
point (Pt. 442.9m) notation as the authors do not know an appropriate name for
it either from local enquiry or from historical research, and its addition to 400m Sub-Pedwar status is due to the analysis of LIDAR data by
Aled Williams. LIDAR (Light Detection
& Ranging) is highly accurate height data that is now freely available for
much of England and Wales.
Aled’s analysis of LIDAR data gives the hill the
following details:
Pt. 442.9m
Summit Height: 442.9m
Summit Grid Reference:
SN 94528 64354
Bwlch Height: 422.3m
Bwlch Grid Reference: SN 94272 64477
Drop: 20.6m
Therefore, the 442.9m LIDAR data produced for the summit
position at SN 94528 64354 and the 422.3m LIDAR data
produced for the bwlch position at SN 94272 64477 gives
this hill 20.6m of drop which is sufficient for its inclusion as a 400m
Sub-Pedwar.
The full details for the hill are:
Cardinal Hill: Gorllwyn
Summit Height: 442.9m
(LIDAR data)
Name: Pt. 442.9
OS 1:50,000 map: 147
Summit Grid Reference:
SN 94528 64354
Drop: 20.6m (LIDAR
data)
The total for Y
Pedwarau remains at 442 hills with nine additions, and fourteen
reclassifications to 400m Sub-Pedwar
status since publication of the list by Europeaklist in May 2013.
The overall total for the 400m
Sub-Pedwarau is now 219 with 26 hills being added and 20 hills being taken
out of this category since publication of the list by Europeaklist in May 2013.
The list of Pedwar
hills is available from the Haroldstreet website (January 2014) with all
subsequent changes detailed on the Mapping Mountains site, with the list also
having commenced publication on Mapping Mountains on the 30.01.17.
For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains
since the May 2013 publication of the list by Europeaklist please consult the
following Change Registers:
Myrddyn Phillips and Aled Williams (August 2017)
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