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

Belles Knott (NY 297 085) – 400m Sub-Four deletion

There has been a deletion 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 Belles Knott (NY 297 085)

The criteria for the list that this deletion applies to are:

The Fours – The 400m Hills of England.  English hills at or above 400m and below 500m in height that have 30m minimum drop, accompanying the main list are three categories of sub hills, with this hill being deleted from the 400m Sub-Four category, the criteria for which are all English hills at or above 400m and below 500m in height that have 20m or more and below 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 24^th April 2018.

The Fours - The 400m Hills of England by Myrddyn Phillips and Aled Williams

The name the hill is listed by is Belles Knott, and it is adjoined to the High Raise group of hills, which are situated in the Lake District, and it is positioned with the B5343 road to its south and the A591 road to its east, and has the village of Grasmere towards the east.

When the 2^nd edition of the The Fours – The 400m Hills of England was published by Mapping Mountains Publications in April 2018, this hill was included as a 400m Sub-Four and listed with an estimated c 21m of drop, based on an estimated c 493m summit height and an estimated c 472m col height, with both heights based on interpolation of 5m contouring that appeared on the interactive mapping hosted on the OS Maps website. 

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 deletion of this hill from 400m Sub-Four status is due to LIDAR analysis, resulting in a 490.6m summit height and a 471.65 col height, with these values giving this hill 18.9m of drop, which is insufficient for it to be classified as a 400m Sub-Four.

 

The full details for the hill are:

Group:  High Raise

Name:  Belles Knott

OS 1:50,000 map:  89, 90

Summit Height:  490.6m (LIDAR)

Summit Grid Reference:  NY 29711 08585 (LIDAR)

Col Height:  471.65m (LIDAR)

Col Grid Reference:  NY 29595 08661 (LIDAR)

Drop:  18.9m (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 1^st edition of this 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 (December 2022)