Mapping Mountains – Significant Name Changes – The Fours – The 400m Hills of England

South Hessary Tor (SX 597 723) 

There has been a Significant Name Change that is retrospective and based on 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 South Hessary Tor (SX 597 723)

The criteria for the list that this name change 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, the 400m Sub-Four category, the 390m Sub-Four category and the 390m Double Sub-Four category.  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 hill is adjoined to the High Willhays group of hills, which are situated in Dartmoor in the south-west of the country, and it is positioned with the B3212 road to its north-west and a minor road to its east, and has the village of Princetown towards the north-west.

When the listing that is now known as The Fours – The 400m Hills of England was originally compiled by Myrddyn Phillips this hill appeared under the directional name of South Hessary Tor North Top with a summit height of 451m positioned at SX 594 730, based on the spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map.                                                        

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

When the 1^st edition of the The Fours now co-authored by Myrddyn Phillips and Aled Williams was published by Europeaklist in December 2013, this hill was listed as South Hessary Tor with a 454m summit height positioned at SX 597 723, based on the spot height that appears on the Harvey Maps 1:40,000 British Mountain Map to Dartmoor.  This is also the name, summit height and position used when the 2^nd edition of the The Fours – The 400m Hills of England was published by Mapping Mountains Publications in April 2018. 

Extract from the Harvey Maps 1:40,000 British Mountain Map to Dartmoor

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.

The height produced by LIDAR analysis gives the highest ground on this hill as 454.1m positioned at SX 59712 72361, as opposed to the originally listed summit position of 450.7m positioned at SX 59448 73056.

Therefore, the name this hill is now listed by in The Fours - The 400m Hills of England is South Hessary Tor and this was instigated from a summit relocation. 

 

The full details for the hill are:

Group:  High Willhays

Name:  South Hessary Tor

Previously Listed Name:  South Hessary Tor North Top 

OS 1:50,000 map:  191

Summit Height:  454.1m (LIDAR)

Summit Grid Reference:  SX 59712 72361 (LIDAR)

Col Height:  418.9m (LIDAR)

Col Grid Reference:  SX 58746 73462 (LIDAR)

Drop:  35.2m (LIDAR)

 

Myrddyn Phillips and Aled Williams (March 2024)

 

 

 

 

  

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

South Hessary Tor (SX 597 723) 

There has been a Summit Relocation that is retrospective 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 South Hessary Tor (SX 597 723)

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, the 400m Sub-Four category, the 390m Sub-Four category and the 390m Double Sub-Four category.  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 South Hessary Tor, and it is adjoined to the High Willhays group of hills, which are situated in Dartmoor in the south-west of the country, and it is positioned with the B3212 road to its north-west and a minor road to its east, and has the village of Princetown towards the north-west.

When the listing that is now known as The Fours – The 400m Hills of England was originally compiled this hill appeared under the name of South Hessary Tor North Top with a summit height of 451m positioned at SX 594 730, based on the spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map. 

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

When the 1^st edition of the The Fours was published by Europeaklist in December 2013, this hill was listed as South Hessary Tor with a 454m summit height positioned at SX 597 723, based on the spot height that appears on the Harvey Maps 1:40,000 British Mountain Map to Dartmoor.  This is also the summit height and position used when the 2^nd edition of the The Fours – The 400m Hills of England was published by Mapping Mountains Publications in April 2018. 

Extract from the Harvey Maps 1:40,000 British Mountain Map to Dartmoor

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. 

LIDAR summit image of South Hessary Tor (SX 597 723)

LIDAR analysis gives the highest ground on this hill as 454.1m positioned at SX 59712 72361, as opposed to the originally listed summit position of 450.7m positioned at SX 59448 73056, 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 LIDAR analysis is 454.1m and this is positioned at SX 59712 72361.  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 700 metres south south-eastward from where the originally listed summit is positioned.

 

The full details for the hill are:

Group:  High Willhays

Name:  South Hessary Tor

OS 1:50,000 map:  191

Summit Height:  454.1m (LIDAR)

Summit Grid Reference (New Position):  SX 59712 72361 (LIDAR)

Col Height:  418.9m (LIDAR)

Col Grid Reference:  SX 58746 73462 (LIDAR)

Drop:  35.2m (LIDAR)

 

Myrddyn Phillips and Aled Williams (March 2024)

 

 

 

 

  

Mapping Mountains – Significant Height Revisions – The Fours – The 400m Hills of England

 

South Hessary Tor (SX 597 723) 

There has been a Significant Height Revision that is retrospective and due to 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 South Hessary Tor (SX 597 723)

The criteria for the list this height revision affects 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, the 400m Sub-Four category, the 390m Sub-Four category and the 390m Double Sub-Four category.  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 South Hessary Tor, and it is adjoined to the High Willhays group of hills, which are situated in Dartmoor in the south-west of the country, and it is positioned with the B3212 road to its north-west and a minor road to its east, and has the village of Princetown towards the north-west.

When the listing that is now known as The Fours – The 400m Hills of England was originally compiled this hill appeared under the name of South Hessary Tor North Top with a summit height of 451m positioned at SX 594 730, based on the spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map. 

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

When the 1^st edition of the The Fours was published by Europeaklist in December 2013, this hill was listed as South Hessary Tor with a 454m summit height positioned at SX 597 723, based on the spot height that appears on the Harvey Maps 1:40,000 British Mountain Map to Dartmoor.  This is also the summit height and position used when the 2^nd edition of the The Fours – The 400m Hills of England was published by Mapping Mountains Publications in April 2018. 

Extract from the Harvey Maps 1:40,000 British Mountain Map to Dartmoor

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. 

LIDAR summit image of South Hessary Tor (SX 597 723)

LIDAR analysis gives the highest ground on this hill as 454.1m positioned at SX 59712 72361, as opposed to the originally listed summit position of 450.7m positioned at SX 59448 73056, and this comes within the parameters of the Significant Height Revisions used within this page heading, these parameters are:

The term Significant Height Revisions applies to any listed hill whose interpolated height and Ordnance Survey or Harvey map summit spot height has a 2m or more discrepancy when compared to the survey result produced by the Trimble GeoXH 6000 or analysis of data produced via LIDAR, also included are hills whose summit map data is missing an uppermost ring contour when compared to the data produced by the Trimble or by LIDAR analysis.

Therefore, the listed summit height of this hill is 454.1m and this was derived from LIDAR analysis, this is 3.1m higher than the originally listed summit height which was based on the 451m spot height that appears on the contemporary Ordnance Survey 1:25,000 Explorer map. 

 

The full details for the hill are:

Group:  High Willhays

Name:  South Hessary Tor

OS 1:50,000 map:  191

Summit Height (New Height):  454.1m (LIDAR)

Summit Grid Reference:  SX 59712 72361 (LIDAR)

Col Height:  418.9m (LIDAR)

Col Grid Reference:  SX 58746 73462 (LIDAR)

Drop:  35.2m (LIDAR)

 

Myrddyn Phillips and Aled Williams (February 2024)

 

 

 

 

English Hill Lists - Major Differences between The Fours and the Tumps

The following are the major differences between the listings of The Fours and the Tumps at the time of compilation / publication of The Fours by Europeaklist.

Upon accurate Trimble surveying and reviewing of data both listings will no doubt undergo amendments.

Cardinal Hill:  The Cheviot

486m    Dryhope Hill    80    NT 928 116    29m

Sub-Four with P29 / Tump with P31

The Tumps list has 31m of drop based on a col height of 455m.  Geograph has a 457m spot height on the area of the col at NT 931 118, giving this hill 29m of drop.

The Fours Europeaklist booklet page 8.

Cardinal Hill:  Scafell Pike

463m    Brown Rigg    90    NY 305 146    c 27

Sub-Four with P27 / Tump with P31

The Tumps list has 31m of drop based on Ordnance Survey col contouring (430m – 440m).  The Fours lists the hill with c 27m of drop based on a combination of Ordnance Survey and Harvey Maps (435m – 450m) col contouring.  If taking in to account Harvey Maps information the col is between 435m – 440m with an estimated col height of c 436m, giving c 27m of drop.

The Fours Europeaklist booklet page 11, Note number 29 (page 28).

Cardinal Hill:  Burnhope Seat

426m    Catterick    92    NY 994 359    29m

Sub-Four with P29 / Tump with P30

The Tumps list has this hill as Catterick Moss with 30m of drop.  This hill has an extensive comment in the notes section of The Fours concerning the drop value.  The trig pillar’s flush bracket height, photos of the summit area, levelled heights on the summit from Ordnance Survey 1:2,500 maps, levelled heights on the col area from Ordnance Survey 1:2,500 maps and a repeated drive over the col in a Google car were all taken in to account when deciding upon the listed drop of 29m.

The Fours Europeaklist booklet page 15, Note number 85 (page 30).

Cardinal Hill:  The Calf

464m    Knott    91    NY 714 012    c 31

Four with P31 / Not listed as a Tump

The TumpPs list does not include this hill.  The Fours lists the hill with c 31m of drop based on a combination of Ordnance Survey (430m – 440m) and Harvey Maps (420m – 435m) col contouring.  If taking in to account Harvey Maps information the col is between 430m – 435m with an estimated col height of c 433m, giving c 31m of drop.

The Fours Europeaklist booklet page 15, Note number 97 (page 31).

Cardinal Hill:  Pen-y-ghent

411m    Pt. 411m    98    SD 953 648    c 29

Sub-Four with P29 / TumpP with P30

The Tumps list has this hill as Malham Moor with a drop of 30m based on a col height of 381m.  The Fours lists the hill with an estimated c 29m of drop based on a col height of c 382m.

The Fours Europeaklist booklet page 17, Note number 123 (page 31).

Cardinal Hill:  Ward’s Stone

c 430    Bowland Knotts    98    SD 727 606    c 86

Four with P86 / Tump listed to different summit

This is a summit re-location from the previously listed top at SD 722 603.  The listed summit at SD 727 606 has a small c 430m ring contour whilst the previously listed top at SD 722 603 has a 430m triangulation pillar with a flush bracket height of 429.932m.  Even though ground a few metres from the trig pillar is slightly higher than the base of the trig, best available evidence points toward the summit at SD 727 606 being slightly higher.  Definitely needs a Trimble survey.

The Fours Europeaklist booklet page 18, Note number 130 (page 32).

Cardinal Hill:  Axe Edge 

407m    Pt. 407m    119    SK 054 680    c 29

Sub-Four with P29 / Tump with P31

The Tumps lists this hill as Brand End with a drop of 31m, giving the height of the col as 376m.  The listing of The Fours estimates the height of the col as c 378m with col contouring between c 375m – c 380m.

The Fours Europeaklist booklet page 21.

Cardinal Hill:  Axe Edge

436m    Upper Edge    119    SK 076 684    20m

Sub-Four with P20 / Tump with P30

The Tumps list has 30m of drop based on a col height of 406m.  The drop in the list of The Fours is 20m based on a 416m spot height on the area of the col on Geograph.  The land that extends from the col has been extensively quarried.

The Fours Europeaklist booklet page 21, Note number 226 (page 35).

Cardinal Hill:  Cilfaesty

403m    Caer Caradoc    137, 148    SO 309 757    56m

Four with P56 / 399m Tump with P52

The 403m spot height is based on the 1,321.4ft (402.76m) levelled height on the Ordnance Survey (OS) 1:2,500 map.  This matches the rounded up 403m height on the old OS 1:50,000 map.  This height is taken to the earthen ramparts of an ancient Iron Age Hill Fort.  Whereas the 399m Tump height is the spot height on current OS 1:50,000 and 1:25,000 maps and is taken to the lower central part of the ancient structure.  The exclusion from the 4 category of the Tumps on the Hill Bagging website may be due to not recognising ancient structures from antiquity that are permanent in nature as being included in the height of a hill, whereas The Fours view such structures as being permanent and a part of the hill.  

The Fours Europeaklist booklet page 24, Note number 272 (page 37).

Cardinal Hill:  High Willhays

454m    South Hessary Tor    191    SX 597 723    c 35

Four with P35 / Tump listed to lower summit

This is a summit re-location from the previously listed top at SX 594 730 as Harvey Maps has a 454m summit spot height as opposed to the previously listed summit (named Middle Hill on Harvey Maps) which has a 451m spot height.

The Fours Europeaklist booklet page 26, Note number 291 (page 37).

‘The Fours’ is available as an e-booklet version and a print-booklet version with or without accompanying photographs on the Europeaklist website.

 https://sites.google.com/site/europeaklist/Home/united-kingdom/england/the-fours  

'The Fours' is also available for GPS Waypoints, Google mapping and on-line hill bagging tick lists on the Haroldstreet website.

The Fours:  http://www.haroldstreet.org.uk/waypoints/download/400s/?list=fours

Sub-Fours:  http://www.haroldstreet.org.uk/waypoints/download/400s/?list=subfours

Double Sub-Fours:  http://www.haroldstreet.org.uk/waypoints/download/400s/?list=double-subfours