Pt. 415.6m (SO 243 011) - 400m Sub-Pedwar reclassified to Pedwar
There has been a reclassification to the listing of Y
Pedwarau with a 400m Sub-Pedwar being promoted to the ranks of Pedwar by analysis of
LIDAR data by Aled Williams. Y Pedwarau
are all hills in Wales at or above 400m and below 500m in height that have a
minimum drop of 30m. The hill was first
analysed with LIDAR data by Joseph Nuttall who on my request had looked at this hill and sent the details to me. Independent of this, Aled also analysed LIDAR data using a slightly different method and confirmed this
hill’s inclusion.
The hill is situated in the group of hills known
as the Y Cymoedd with its Cardinal Hill being Mynydd Coety (SO 231 079) and is
placed in the Region of South Wales (C2).
The hill is positioned between the towns of Pont-y-pŵl (Pontypool) to its east and
Abertyleri (Abrtillery) to its north north-west, with its summit positioned
above the head of the valleys comprising the Nant Ffrwd-oer and the Nant y
Caws. The hill can be accessed from the
Blaen-y-cwm Road to its south-west where a track leads round the south, east
and then north of the summit, the high point of the hill is in a conifer
plantation but is not difficult to get to.
As the authors have not found an appropriate name
for the hill the Point (Pt. 415.6m) notation is being used. The hill is the relic of mine spoil and is
therefore man-made, with old Ordnance Survey maps showing a continuous decline
from the summit of the higher adjacent Mynydd Llanhiledd without any contours
for where this hill is now found.
The hill was listed as a 400m Sub-Pedwar based on the
416m summit spot height on the Ordnance Survey enlarged mapping hosted on the Geograph
website and an interpolated height for the connecting bwlch of c 388m, based on
bwlch contouring between 380m – 390m.
Aled’s analysis of LIDAR data gives the hill the
following details:
Pt.
415.6m
Summit
Height: 415.6m
Summit
Grid Reference: SO 24354 01195
Bwlch
Height: 384.2m
Bwlch
Grid Reference: SO 24535 01192
Drop: 31.4m
Therefore, the 415.6m LIDAR data produced for the summit
position at SO 24354 01195 and the 384.2m LIDAR data
produced for the bwlch position at SO 24535 01192 is sufficient for this hill
to be included as a Pedwar with 31.4m of drop, and therefore Pt. 415.6m is
included in the listing of the Y Pedwarau and the list will be updated accordingly.
The full details for the hill are:
Cardinal Hill: Mynydd Coety
Summit Height: 415.6m
(LIDAR data)
Name: Pt. 415.6m
OS 1:50,000 map: 171
Summit Grid Reference:
SO 24354 01195
Drop: 31.4m (LIDAR
data)
This now brings the overall total for the Y Pedwarau to 446 hills
with six additions, and seven reclassifications to 400m Sub-Pedwar since publication
of the list by Europeaklist in May 2013.
The hill will be taken out of the 400m Sub-Pedwar list and added to the main
list in forthcoming publications. The
list of Pedwar hills is available from the Haroldstreet website (January 2014)
with all subsequent changes available via the Mapping Mountains site.
The list of additions and reclassifications from the Pedwar
list since the 1st edition of the Y Pedwarau was published by
Europeaklist are as follows:
PEDWAR ADDITIONS
Pt. 499.5m (converted to OSGM15) (SH 665 310) 400m Sub-Pedwar reclassified to Pedwar with 30.3m drop
Pt. 415.6m (LIDAR data) (SO 243 011) 400m Sub-Pedwar reclassified to Pedwar
with 31.4m drop
PEDWAR RECLASSIFICATIONS
Pt. 422.3m (converted to OSGM15) (SO 073 822) Pedwar reclassified to 400m Sub-Pedwar with 29.0m drop
Pt. 407.7m (converted to OSGM15) (SO 180 692) Pedwar reclassified to 400m Sub-Pedwar with 28.3m drop
Myrddyn Phillips and Aled Williams (December 2016)
No comments:
Post a Comment