Pt. 408.4m (SO 186 070) - 400m Sub-Pedwar addition
There has been a new 400m Sub-Pedwar added to the list of the Y Pedwarau
by analysis of LIDAR data by Aled Williams.
The 400m Sub-Pedwarau are the Welsh hills at or above 400m and below 500m in
height with a drop between 20m and below 30m.
The hill is situated in the group of hills known
as the Y Cymoedd with its Cardinal Hill being Mynydd Carn y Cefn (SO 187 085) and
is placed in the Region of South Wales (C-2).
The hill is positioned above the small community of Waunlwyd to its west
and the small town of Blaenau to its east north-east, and can be
easily accessed from a track to its south.
As the authors have not confirmed a locally known
name for the hill we are following the point (Pt. 408.4m) notation principal
and listing it as Pt. 408.4m, and prior to the analysis of LIDAR data the hill
was not included in any hill list as the map details for it are blank, this is
because the hill is a part of old mine workings and the result of waste spoil.
As Aled was analysing other hills in the vicinity
against LIDAR data, he did likewise with Pt. 408.4m. 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. 408.4m
Summit Height: 408.4m
Summit Grid Reference:
SO 18603 07087
Bwlch Height: 386.4m
Bwlch Grid Reference:
SO 18464 07321
Therefore, the 408.4m LIDAR data produced for the summit
position at SO 18603 07087 and the 386.4m LIDAR data
produced for the bwlch position at SO 18464 07321 is sufficient for this hill
to be classified as a 400m Sub-Pedwar with 22.0m of drop, and therefore Pt. 408.4m
is included in the listing of 400m Sub-Pedwar hills and the list of the Y Pedwarau will
be updated accordingly. The list of
Pedwar hills is available from the Haroldstreet website (January 2014) with all
subsequent changes available via the Mapping Mountains site.
The full details for the hill are:
Cardinal Hill: Mynydd
Carn y Cefn
Summit Height: 408.4m
(LIDAR data)
Name: Pt. 408.4m
OS 1:50,000 map: 161
Summit Grid Reference: SO 18603 07087
Drop: 22.0m (LIDAR
data)
The list of additions, reclassifications and deletions from
the 400m Sub-Pedwar list since the 1st edition of the Y Pedwarau was
published by Europeaklist are as follows:
400m SUB-PEDWAR ADDITIONS
Pt. 408.4m (LIDAR data) (SO 186 070) 22.0m drop
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
400m SUB-PEDWAR RECLASSIFICATIONS
Pt. 499.5m (converted to OSGM15) (SH 665 310) 400m Sub-Pedwar reclassified to Pedwar with 30.3m drop
400m SUB-PEDWAR DELETIONS
Myrddyn Phillips and Aled Williams (December 2016)
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