Inner Hill (NT 877 088) – 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 Inner Hill (NT 877 088) |
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 name the hill is listed by is Inner Hill, 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 has the village of Alwinton towards the 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.
Prior to this revision this hill was listed with 15m
of drop, based on the 436m summit spot height that appears on the Ordnance
Survey 1:25,000 Explorer map and the 421m col spot height that appeared on the
Ordnance Survey Vector Map Local hosted on the Geograph website and which was
entitled the Interactive Coverage Map.
|
Extract from the Ordnance Survey 1:25,000 Explorer map |
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 435.3m summit height and
a 420.8m 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: Inner Hill
OS 1:50,000 map: 80
Summit Height: 435.3m
(LIDAR)
Summit Grid Reference:
NT 87764 08835 (LIDAR)
Col Height: 420.8m
(LIDAR)
Col Grid Reference: NT
87644 09276 (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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