Dinas Fach (SM 825 226) – Dominant addition
There has been an addition to the list of the Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill obtained from the summit analysis programme that uses LIDAR produced by Joe Nuttall, and then by LIDAR analysis initially conducted by Jim Bloomer and subsequently by Myrddyn Phillips.
LIDAR image of Dinas Fach (SM 825 226) |
Y Trechol - The Dominant Hills of
Wales - Welsh P30 hills whose prominence
equal or exceed half that of their absolute height. With the
criteria for Lesser Dominant status being those additional Welsh P30 hills whose
prominence is between one third and half that of their absolute height. The list is authored by Myrddyn Phillips with
the Introduction to the start of the Mapping Mountains publication of this list
appearing on the 3rd December 2015, and the list is now available in its entirety on Mapping Mountains in Google Doc format.
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was not included in the main P30 list or the accompanying Hills to be surveyed sub list, as it was considered not to meet the criteria then used in either category.
Extract from the Ordnance Survey 1:50,000 Landranger map |
Extract from the 1:25,000 Explorer map |
Extract from the Magic Maps website |
Therefore, the addition of this hill to Dominant status is due to LIDAR analysis, resulting in a 30.45m summit height and a 0.3m bwlch height, with these values giving this hill 30.15m of drop and 99.01% dominance which is sufficient for Dinas Fach to be classified as a Dominant hill.
The full details for the hill are:
Group: Carn Llidi
Name: Dinas Fach
OS 1:50,000 map: 157
Summit Grid Reference:
SM
82559 22659 (LIDAR)
Summit Height: 30.45m
(LIDAR)
Bwlch Grid Reference:
SM 82605 22745 (LIDAR)
Drop Summit to Bwlch:
30.15m (LIDAR)
Drop Bwlch to ODN: 0.3m
(LIDAR)
Dominance: 99.01%
Myrddyn Phillips (October 2021)
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