Mapping Mountains – Hill Reclassifications – The Fours - The 400m Hills of England

Green Hill (NY 853 533) – 400m Sub-Four reclassified to Four

There has been a reclassification to the listing of The Fours - The 400m Hills of England due to LIDAR analysis conducted by Aled Williams.  This list takes in all English hills at and above 400m and below 500m in height that have a minimum 30m of drop, the list is co-authored by Myrddyn Phillips and Aled Williams and the 2^nd edition of the booklet containing this list was published by Mapping Mountains Publications on the 24th April 2018.

LIDAR image of Green Hill (NY 853 533)

Accompanying the main list are three categories of sub hills, with this hill being reclassified from the 400m Sub-Four category.  The criteria for which are all English hills at and above 400m and below 500m in height that have 20m and more and below 30m of drop.

The name the hill is listed by is Green Hill and it is situated in the Northern and Central Pennines area and is placed in Region 35, Section 35A, with its Cardinal Hill being Burnhope Seat (NY 784 375).  The hill is positioned above the B 6295 road to its west and has the small community of Allendale Town to its north north-west. 

 

Extract from the Ordnance Survey 1:50,000 Landranger map

Prior to LIDAR analysis this hill was listed with 28m of drop based on the 419m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and the 391m col spot height that appears on the Ordnance Survey 1:25,000 Explorer map.

Extract from the Ordnance Survey 1:25,000 Explorer map

The summit of the hill is a part of designated open access land and can be approached via bridleways from the north and the south that lead up tracks that head on to open hillside where public footpaths then lead over the open access land.

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 reclassification of this hill from 400m Sub-Four status is due to LIDAR analysis, resulting in a 419.7m summit height and a 389.7m col height, with these values giving this hill 30.0m of drop, which is sufficient for it to be classified as a Four. 

The full details for the hill are:

Group:  Burnhope Seat

Name:  Green Hill

OS 1:50,000 map:  87

Summit Height:  419.7m (LIDAR)

Summit Grid Reference:  NY 85366 53385 (LIDAR)

Col Height:  389.7m (LIDAR)

Col Grid Reference:  N 85758 53016 (LIDAR)

Drop:  30.0m (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 list by Europeaklist please consult the following Change Registers:

The Fours

The Fours – 400m Sub-Four

The Fours – 390m Sub-Four

The Fours – 390m Double Sub-Four

Myrddyn Phillips and Aled Williams (May 2018)