Tuesday, 15 May 2018

Mapping Mountains – Hill Reclassifications – The Fours


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

There has been a reclassification to the listing of The Fours due to LIDAR analysis conducted by Aled Williams.  The Fours is the title for the list of 400m hills of England and 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 2nd edition of the booklet containing this list was published by Mapping Mountains Publications on the 24th April 2018.

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

The name of the hill 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 which is to its west and has the small community of Allendale Town to its north north-west.

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.

The reclassification of Green Hill to Four status is due to LIDAR analysis conducted by Aled Williams.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.


Aled’s LIDAR analysis gives the hill the following details:


Green Hill

Summit Height:  419.6m

Summit Grid Reference:  NY 85365 53384

Col Height:  389.6m

Col Grid Reference:  NY 85766 53013

Drop:  30.05m


Therefore, the 419.6m LIDAR analysis for the the summit position at NY 85365 53384 and the 389.6m LIDAR analysis for the col position at NY 85766 53013 gives this hill 30.05m of drop which is sufficient for it to be reclassified to a Four.


The full details for the hill are:

Cardinal Hill:  Burnhope Seat

Summit Height:  419.6m (LIDAR)

Name:  Green Hill

OS 1:50,000 map:  87

Summit Grid Reference:  NY 85365 53384 (LIDAR)

Drop:  30.05m (LIDAR)


For the additions, deletions and reclassifications to The Fours reported on Mapping Mountains since the December 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (May 2018)

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