Mapping Mountains – Summit Relocations – The Fours – The 400m Hills of England

Holgates Kilnsey Moor (SD 950 660) 

There has been a Summit Relocation to a hill that is listed in 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 Holgates Kilnsey Moor (SD 950 660)

The criteria for the list that this summit relocation 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 included in 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 Holgates Kilnsey Moor and it is adjoined to the Pen y Ghent group of hills, which are situated in the central Pennines, and it is positioned with a minor road to its south, and the B6160 road to its east, and has the village of Threshfield towards the south-east.

When the 1^st edition of the The Fours was published by Europeaklist in December 2013, this hill was listed with 27m of drop, based on the 450m summit spot height adjoined to a triangulation pillar positioned at SD 95174 66059 that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 423m col spot height that appears on the Ordnance Survey 1:25,000 Explorer map. 

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

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 listed with the same 27m drop value, but now with a 450.4m summit height positioned at SD 95175 66059 ascertained from LIDAR analysis.

However, it was not until the latest LIDAR became available that the details for this hill could be re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales. 

LIDAR summit image of Holgates Kilnsey Moor (SD 950 660)

Latest LIDAR analysis gives the highest ground on this hill as 450.5m positioned at SD 95085 66075, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:

The term Summit Relocations applies to when the high point is positioned in a different field, to a different feature such as a conifer plantation, within a different map contour, a different point where a number of potential summit positions are within close proximity, when natural ground or the natural and intact summit is confirmed compared to a higher point such as a raised field boundary or covered reservoir that is considered a relatively recent man-made construct, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist.

Therefore, the summit height produced by latest LIDAR analysis is 450.5m and this is positioned at SD 95085 66075.  This position is not given a spot height on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and is approximately 90 metres westward from where the original listed summit is positioned.

 

The full details for the hill are:

Group:  Pen y Ghent

Name:  Holgates Kilnsey Moor

OS 1:50,000 map:  98

Summit Height:  450.5m (LIDAR)

Summit Grid Reference (New Position):  SD 95085 66075 (LIDAR)

Col Height:  422.2m (LIDAR)

Col Grid Reference:  SD 94954 66475 (LIDAR)

Drop:  28.3m (LIDAR)

 

Myrddyn Phillips and Aled Williams (May 2023)