22.10.18 Plas Gwyn (SH 524 817)
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| Plas Gwyn (SH 524 817) |
This hill is perched
above the eastern coastline of Ynys Môn and looks out over
Traeth Coch (Red Wharf Bay) and across to the forested summit of Mynydd
Llwydiarth and the limestone encrusted summit of Bwrdd Arthur. Prior to my visit I had analysed its summit
and bwlch with LIDAR and now wanted an on-site visit to bag its summit and take
two data sets; one from where LIDAR gives its high point to be situated and the
other at a fence junction where the summit is reported to be situated on the
Hill Bagging website.
I parked opposite a
public football beside the A 5015 as it makes its way between Pentraeth and
Benllech. After spending the morning and
early afternoon visiting four P30s dotted across the south-eastern part of the
island, many of which were tucked away with the nearest access being narrow
country lanes, it felt unusual to encounter fast moving traffic seemingly
hurtling past going who knows where.
After waiting for a number of cars and lorries to pass I made my way
over the strip of tarmac and through a kissing gate to instant tranquillity and
other worldliness as an enclosed old green lane made its way south-eastward up
the lower southern part of this hill.
As height was gained a
gate gave access to the manicured grazing field on my left, this stretched out
toward the high point of the hill, and with beautiful afternoon blue sky above
and a slight warmth, and with no one about, it seemed I had the hill to myself,
even sheep were absent.
I followed a boundary
fence until a gap gave access to the large field toward where the high point of
the hill is situated. Approaching from
the south gave me chance to examine the lay of land as I neared the summit and
to me it was relatively obvious where its high point lay, once there I compared
my position against the ten figure grid reference that the Trimble gave and it
matched the LIDAR summit to within one metre.
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| Gathering data at the summit of Plas Gwyn (SH 524 817) |
Having set the Trimble
up and activated it to gather data I walked over to the fence boundary where
the high point has been reported to be situated. This part of the hill rises more steeply
compared to where LIDAR gives the summit to be placed. I spent a number of minutes examining this
part of land and decided that a second data set was necessary.
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| The Trimble set-up position at the summit of Plas Gwyn (SH 524 817) |
Once the Trimble had
gathered and stored data from the LIDAR summit I set it up on what I judged to
be the highest natural land beside the fence and again waited for the allotted
data to be gathered. During this I again
examined this part of land and realised that the Trimble was placed on what
looked like the remains of an old boundary that is slightly raised, but this is
not shown as such on the Tithe map.
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| Gathering data at the second Trimble set-up position |
It was a delight to wait
for these two data sets to be collected as the weather was blissful with wisps
of high cloud accentuating the blueness of sky.
Once the Trimble was packed away I wandered back down the hill to
another gate giving access on to the public footpath and then continued on it
toward the Porthllongdy Caravan Site where I met David Bennet. David didn’t know the name of the hill or the
field name where its summit is situated, but said if anyone knew it would be
Michael Buckley who owns this land.
David directed me to
Rhiwlas; Michael Buckley’s home, where I knocked on several doors,
unfortunately no one was in, but I did meet the hedge cutter who kindly gave me
a forwarding telephone number to make further enquiries. Once contacted, Michael gave me the name of Plas Gwyn for the hill, with it taking its name from the farm to its south.
Survey Result:
Plas Gwyn (significant name change)
Summit Height: 76.1m (converted to OSGM15, Trimble GeoXH 6000)
Summit Grid Reference: SH 52494 81743 (Trimble GeoXH 6000) (summit relocation confirmed)
Bwlch Height: 41.9m (LIDAR)
Bwlch Grid Reference: SH 52209 81404 (LIDAR)
Drop: 34.2m (Trimble GeoXH 6000 summit and LIDAR bwlch)
Dominance: 44.91% (Trimble GeoXH 6000 summit and LIDAR bwlch)
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