Pt. 429.1m (NT 905 114) – Sub-Four exclusion
There has been an exclusion to the listing of the The Fours – The 400m Hills of England, with
the summit height, col height and their locations, the drop and status of the
hill derived from LIDAR analysis conducted by Myrddyn Phillips.
|
LIDAR image of Pt. 429.1m (NT 905 114) |
The criteria for the list that this exclusion applies
to are:
|
The Fours - The 400m Hills of England by Myrddyn Phillips and Aled Williams |
The hill is being listed by the point (Pt. 429.1m) notation, and
it is adjoined to the The Cheviot
group of hills, which are
situated in Northumberland, and it is positioned with a minor road to its
south-west and south-east, and has the village of Alwinton towards the south south-east.
When the Introduction to the first group of hills
for the updated and revised listing of the The
Fours – The 400m Hills of England was published by Mapping Mountains on the
10th September 2022, it was announced that the accompanying sub
lists were being revised with the two 390m categories dispensed with and the criteria
and name of the 400m Sub-Fours revised.
The one accompanying sub list is now named the Sub-Fours with its
criteria being all English hills 400m and above and below 500m in height that
have 15m and more and below 30m of drop.
|
Extract from the Ordnance Survey 1:25,000 Explorer map |
Prior to this revision this hill was listed with
an estimated c 15m of drop, based on the 429m 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 which latterly appears on
the interactive mapping hosted on the WalkLakes website, and an estimated c
414m col height, based on interpolation of 10m contouring between 410m – 420m.
|
Extract from the interactive mapping hosted on the WalkLakes website |
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 exclusion of this hill from Sub-Four
status is due to LIDAR analysis, resulting in a 429.1m summit height and a 414.8m
col height, with these values giving this hill 14.4m of drop, which is
insufficient for it to be classified as a Sub-Four.
The full details for the hill are:
Group: The Cheviot
Name: Pt. 429.1m
OS 1:50,000 map: 80
Summit Height: 429.1m
(LIDAR)
Summit Grid Reference:
NT 90545 11499 (LIDAR)
Col Height: 414.8m
(LIDAR)
Col Grid Reference: NT
90579 11580 (LIDAR)
Drop: 14.4m (LIDAR)
For the additions, deletions and reclassifications to The Fours – The 400m Hills of England
reported on Mapping Mountains since the December 2013 publication of the 1st
edition of this list by Europeaklist please consult the following Change
Registers:
The Fours
Sub-Fours
Myrddyn Phillips and Aled Williams (September 2024)
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