Mynydd Madyn (SH 454 933)
There has been a Significant Name Change to a hill that used to be listed in The Welsh P15s, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Mynydd Madyn (SH 454 933) |
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. 42m) notation with an estimated c 14m of drop, based on the 42m 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 appears 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: Mynydd Madyn
Previously Listed Name: Pt. 42m
OS 1:50,000 map: 114
Summit Height: 40.9m (LIDAR)
Summit Grid Reference: SH 45430 93304 (LIDAR)
Bwlch Height: 27.6m (LIDAR)
Bwlch Grid Reference: SH 45414 93172 (LIDAR)
Drop: 13.2m (LIDAR)
Myrddyn Phillips (July
2021)
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