Craig Ysgafn (SH 659 443) – Welsh
Highland Sub addition
There has been an addition to the listing of the Welsh Highlands – Uchafion Cymru, with the summit height, bwlch height
and their locations, the drop and status of the hill derived from a Trimble
GeoXH 6000 survey conducted by Aled Williams.
|
Craig Ysgafn (Photo: Aled Williams) |
The criteria for the list that this addition applies to are:
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Welsh Highlands - Uchafion Cymru by Myrddyn Phillips and Aled Williams |
The name the hill is listed by is Craig Ysgafn and
it is adjoined to the Moelwyn Mawr group of hills, which are situated in the north-western part of
North Wales (Region A, Sub-Region A2), and
it is positioned with the A4085 road to its west, the A487 road to its south
and the A496 road to its east, and has the town of Blaenau Ffestiniog towards
the north-east.
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Extract from the Ordnance Survey 1:25,000 Explorer map |
Prior to the survey with the Trimble GeoXH 6000
this hill was listed with 9.9m of drop, based on a 687.7m summit height and a
677.8m bwlch height, with both heights derived from LIDAR analysis conducted by
Aled Williams, with a previous basic levelling survey conducted by Myrddyn
Phillips on the 18.04.98 giving 10.0m of drop.
Due to the marginal nature in the drop ascertained
from LIDAR analysis, this hill was prioritised for a Trimble GeoXH 6000 survey
and it is this result that is being prioritised.
Therefore, the addition of this hill to Welsh
Highland Sub status is due to a Trimble GeoXH 6000 survey, resulting in a 688.3m
summit height and a 678.0m bwlch height, with these values giving this hill 10.3m
of drop, which is sufficient for it to be classified as a Welsh Highland Sub.
The full details for the hill are:
Group: Moelwyn Mawr
Name: Craig Ysgafn
OS 1:50,000 map: 124
Summit Height: 688.3m (converted
to OSGM15)
Summit Grid Reference:
SH 65973 44394
Bwlch Height: 678.0m (converted
to OSGM15)
Bwlch Grid Reference:
SH 65960 44382
Drop: 10.3m
For the additions, deletions and reclassifications to the Welsh Highlands – Uchafion Cymru
reported on Mapping Mountains please consult the following Change Registers:
Welsh Highland P15s
Welsh Highland Subs
Aled Williams and Myrddyn Phillips (March 2023)
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