Bwlch (SH 350 914)
There has been a Significant Name Change to a hill that is listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Bwlch (SH 350 914) |
The Welsh
P15s – Welsh hills with 15m
minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s,
with the criteria for this sub category being all Welsh hills with 14m or more
and below 15m of drop. The list is authored by Myrddyn Phillips, with the
Introduction to the list appearing on Mapping Mountains on the 10th
May 2019.
The Welsh P15s by Myrddyn Phillips |
When the listing that became known as The Welsh P15s was being compiled, this hill was listed under the point (Pt. 44m) notation with an estimated c 16m of drop, based on the 44m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 28m bwlch height based on interpolation of 5m contouring between 25m – 30m that appear on the Ordnance Survey 1:25,000 Explorer map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
Extract from the Tithe map |
Extract from the apportionments |
The full details for the hill are:
Group: Ynys Môn
Name: Bwlch
Previously Listed Name: Pt. 44m
OS 1:50,000 map: 114
Summit Height: 45.5m (LIDAR)
Summit Grid Reference: SH 35072 91457 (LIDAR)
Bwlch Height: c 28m (interpolation)
Bwlch Grid Reference: SH 35481 91095 (interpolation)
Drop: c 18m (LIDAR summit and interpolated bwlch)
Myrddyn Phillips (August
2021)
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