Lan (SO 052 391) - 400m Sub-Pedwar reclassified to Pedwar
There has been a reclassification to the listing of the 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 is situated in the Mynydd Epynt group of hills and is
placed in the Region of Mid and West Wales (B-2). The hill is positioned between the small communities
of Lower Chapel to the south south-west and Erwyd (Erwood) to the north-east, and
the summit area of the hill is covered in the Brycheiniog Forest conifer
plantation with the nearest forest track to the summit being to the north, this
track ascends the hill from the small community of Llaneglwys to the east
south-east and contours around the hill’s eastern slopes before heading
northward of its summit.
The name of the hill is Lan and this was found on
the Tithe map from research conducted by Aled Williams, the hill was previously
listed as a 400m Sub-Pedwar with c 29m of drop based on an estimated summit height
of c 407m and an estimated bwlch height taken from contour interpolation of c
378m.
As Aled was analysing other hills in the vicinity
against LIDAR data, he did likewise with Lan.
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:
Lan
Summit
Height: 413.6m
Summit
Grid Reference: SO 05243 39144
Bwlch
Height: 377.0m
Bwlch
Grid Reference: SO 04871 39392
Drop: 36.6m
Therefore, the 413.6m LIDAR data produced for the
summit position at SO 05243 39144 and
the 377.0m LIDAR data produced for the bwlch position at SO
04871 39392 is sufficient for this hill
to be reclassified to a Pedwar with 36.6m of drop, and therefore Lan is included
in the listing of the Y Pedwarau and the list will be updated accordingly.
The full details for the hill are:
Group: Mynydd Epynt
Summit Height: 413.6m
(LIDAR data)
Name: Lan
OS 1:50,000 map: 160
Summit Grid Reference: SO 05243 39144
Drop: 36.6m (LIDAR
data)
This now brings the overall total for the Y Pedwarau to 446 hills
with seven additions, and eight reclassifications to 400m Sub-Pedwar status 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
Lan (LIDAR data) (SO 052 391) 400m Sub-Pedwar reclassified to
Pedwar with 36.6m 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)
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