Ffynnon Fair (SN 541 469) – 100m Sub-Twmpau reclassified to 100m Twmpau
There has been confirmation of a reclassification to the list of 100m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Ffynnon Fair (SN 541 469) |
The criteria for the list that this
reclassification applies to are:
100m Twmpau
– Welsh hills at or above
100m and below 200m in height that have 30m minimum drop, with an accompanying sub list entitled the 100m
Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or
above 100m and below 200m in height with 20m or more and below 30m of drop,
with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 100m Twmpau by Myrddyn Phillips |
The name the hill is now listed by is Ffynnon Fair
and this was derived from the Tithe map, and it is adjoined to the Mynydd Bach
group of hills, which are situated in the western
part of South Wales (Region B, Sub-Region B1), and it is positioned with the A475 road to its north,
the B4337 road to its west and the A485 road to its south, and has the town of Llanbedr
Pont Steffan (Lampeter) towards the east north-east.
When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was included
in the Hills to be surveyed sub list,
as it was considered not to meet the criteria then used for the main P30
category.
When the sub list was standardised, and
interpolated heights and drop values also included the details for this hill
were re-assessed and it was listed with an estimated c 31m of drop, based on
the 157m summit spot height that appears on the Ordnance Survey 1:25,000
Explorer map and an estimated c 126m bwlch height based on interpolation of 10m
contouring between 120m – 130m.
Extract from the Ordnance Survey 1:25,000 Explorer map |
The details for this hill were re-assessed when
the Ordnance Survey Vector Map Local hosted on the Geograph website and which
was entitled the Interactive Coverage Map became available online. This mapping had many spot heights not on
other publicly available Ordnance Survey maps and for this hill it had bwlch
contouring between 120m – 125m , with interpolation giving the height of the
bwlch as an estimated c 123m, resulting in the drop value of this hill being
amended to an estimated c 34m.
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.
Therefore, the confirmation of the
reclassification of this hill from 100m Sub-Twmpau status is due to LIDAR analysis,
, resulting in a 156.6m summit height and a 122.7m bwlch height, with these
values giving this hill 34.0m of drop, which is sufficient for it to be
classified as a 100m Twmpau.
The full details for the hill are:
Group: Mynydd Bach
Name: Ffynnon Fair
OS 1:50,000 map: 146
Summit Height: 156.6m (LIDAR)
Summit Grid Reference: SN 54187 46971 (LIDAR)
Bwlch Height: 122.7m (LIDAR)
Bwlch Grid Reference: SN 53901 47269 (LIDAR)
Drop: 34.0m (LIDAR)
Myrddyn Phillips
(January 2023)
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