Coed y Gaer (SO 004 843) – Lesser
Dominant addition
There has been an addition to the listing of Y Trechol – The Dominant Hills of Wales prompted by a survey with the Trimble GeoXH 6000 and confirmed by subsequent LIDAR analysis; resulting in this hill being included in the Lesser Dominant sub list.
With the criteria for inclusion to
the Dominant list being those Welsh P30 hills whose
prominence equal or exceed half that of their absolute height, whilst the
criteria for the Lesser Dominant list
are those additional Welsh P30s whose prominence is 33% or more and below 50%
of their absolute height.
The details relating to the inclusion of this hill in the Lesser Dominant category are retrospective as the confirmation of its addition
is dependent upon a survey with the Trimble GeoXH 6000 which was conducted on
the 9th February 2014, with the relevant post giving the survey
details appearing on Mapping Mountains on the 11th February 2014.
When the sub category of hills accompanying
the Welsh P30 lists published on Geoff Crowder’s v-g.me website were
standardised with interpolated drop values, this hill was listed with an
estimated c 119m of drop based on its 362m summit spot height and an estimated
bwlch height of c 243m, these values gave this hill 32.87% dominance, which was
insufficient for it to be classified as a Lesser
Dominant hill. The drop value was subsequently
altered due to a 241m bwlch spot height appearing on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map, this resulted in the dominance of the hill also being amended.
The name the hill is listed by is Coed y
Gaer and it is adjoined to the Hirddywel group and is placed in the Region of Mid
and West Wales (Region B, Sub-Region B1) with its Cardinal Hill being Pegwn
Mawr (SO 023 812), and is situated above the A 470 road and the Afon Hafren
(River Severn) which are to its north, and it is positioned between the small
community of Llandinam to the north
north-east and the town of Llanidloes to the west.
As the hill is not a part of
designated open access land permission to visit should be sought, for those
wishing to do so a minor lane to the south of the hill gives access to steep
slopes leading to the summit.
Therefore, the addition of Coed y Gaer to
Lesser Dominant status was prompted by a Trimble GeoXH 6000 survey and subsequently confirmed by LIDAR analysis, resulting in a 361.0m summit
height and a 239.5m bwlch height, with these values giving this hill 121.5m of drop and 33.65% of dominance.
The full details for the hill are:
Group: Hirddywel
Name: Coed y Gaer
Dominance: 33.65% (LIDAR)
OS 1:50,000 map: 136
Summit Grid Reference: SO
00491 84393 (LIDAR)
Summit Height: 361.0m (LIDAR)
Drop Summit to Bwlch: 121.5m
(LIDAR)
Drop Bwlch to ODN: 239.5m (LIDAR)
Myrddyn Phillips (August 2017)
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