Pt. 524.3m (SN 881 163) – 500m Sub-Uchaf
reclassified to Uchaf
There has been a reclassification to a hill that is listed in
the The Welsh Highlands – Uchafion Cymru,
through the results of a Trimble GeoXH 6000 survey conducted by Myrddyn
Phillips on the 27th July 2019.
 |
| Pt. 524.3m (SN 881 163) |
The criteria for the list that this reclassification applies
to are:
The Welsh Highlands –
Uchafion Cymru
– This is the revised draft title for the Welsh 500m P15s list that takes
in all hills in Wales at or above 500m in height with 15m minimum drop. Accompanying the main list are three sub
lists, these are; 500m Sub-Uchaf, 490m Sub-Uchaf and the Double Sub category,
with this hill being reclassified from the 500m Sub-Uchaf category, the
criteria for which are all Welsh hills at or above 500m in height with 14m or
more and below 15m of drop. The list is
co-authored by Myrddyn Phillips and Aled Williams with the Introduction to the list being published on Mapping Mountains in November 2015 and an update relating to the list appearing on Mapping Mountains on the 19th June
2019.
As an appropriate name for
the hill has not been substantiated either from local enquiry or historic
research it is being listed by the point (Pt. 524.3m) notation, and it is adjoined
to the Fforest Fawr group of hills, which are situated in the western part of South Wales (Region C,
Sub-Region C2), and is positioned with the A4067
road to its west, and has the village of Abercraf (Abercrave) towards the
south-west.
This hill was not included when the original list
of Welsh 500m P15s that later became known as Yr Uchafion and latterly as The
Welsh Highlands – Uchafion Cymru was compiled, as details on contemporary
Ordnance Survey maps of the day indicated that it did not have the minimum of
15m of drop required to be included in this list.
 |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
However, it was not until LIDAR became available
that the details for this hill could be accurately re-assessed. The LIDAR (Light Detection & Ranging)
technique produced highly accurate height data that is now freely available for
much of England and Wales.
LIDAR analysis was conducted by Aled Williams and produced
a 524.0m summit height positioned at SN 88113 16370 and a 509.4m bwlch height positioned
at SN 87908 16298, giving the hill a drop of 14.6m and thereby confirming its
status as a 500m Sub-Uchaf.
 |
| Gathering data at the summit of Pt. 524.3m (SN 881 163) |
 |
| Gathering data at the bwlch of Pt. 524.3m |
The summit and bwlch of this hill have now been
surveyed by Myrddyn Phillips with the Trimble GeoXH 6000, using the LIDAR
summit and bwlch grid references produced by Aled Williams as a guide. This survey resulted in a 524.3m summit
height and a 509.2m bwlch height, with these values giving this hill 15.0m of
drop, which is sufficient for it to be reclassified to Uchaf status.
The full details for the hill are:
Group: Fforest Fawr
Name: Pt. 524.3m
OS 1:50,000 map: 160
Summit Height: 524.3m
(converted to OSGM15)
Summit Grid Reference:
SN 88113 16370
Bwlch Height: 509.2m
(converted to OSGM15)
Bwlch Grid Reference:
SN 87908 16298
Drop: 15.0m
For the additions, deletions and reclassifications to The Welsh Highlands – Uchafion Cymru reported
on Mapping Mountains please consult the following Change Registers:
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