Mapping Mountains – Summit Relocations – 100m Twmpau

Cae Alen (SH 781 758)

There has been a Summit Relocation to a hill that is listed in the 100m Twmpau, with the summit height, its location, the drop and status of the hill confirmed by LIDAR analysis, and a subsequent summit survey with the Trimble GeoXH 6000 conducted by Myrddyn Phillips, with the latter taking place on the 10^th October 2018.

LIDAR image of Cae Alen and Bwlch Mawr

The criteria for the list that this summit relocation applies to are:

               

100m Twmpau - Welsh hills at or above 100m and below 200m in height with 30m minimum drop, with an accompanying sub list entitled the 100m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 100m and below 200m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

The name of the bounded land where the summit of this hill is situated is Cae Alen and this was derived from the Tithe map, and it is this name that the hill is now listed by.  The hill is adjoined to the Carneddau group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the B5106 road to its west and the Afon Conwy (River Conwy) to its east, and has the town of Conwy towards its north.

This summit relocation relates to two points, with the north-easterly point given a 130m summit spot height positioned at SH 781 758 on contemporary Ordnance Survey maps, and the south-westerly point given a small uppermost 130m ring contour positioned at SH 777 755.

When the origin 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, the north-easterly 130m map heighted summit positioned at SH 781 758 was prioritised for P30 status over that of the south-westerly point positioned at SH 777 755.

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

The details for these hills were re-assessed when the Ordnance Survey Vector Map Local became available online, this map is hosted on the Geograph website and is entitled the Interactive Coverage Map, and as an uppermost contour ring should be prioritised over that of a same map heighted spot height the south-westerly point positioned at SH 777 755 was now prioritised for P30 status over the north-easterly 130m spot heighted summit positioned at SH 781 758.

It was not until LIDAR became available and analysed that the details for these hills 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 image of Bwlch Mawr

The height produced by LIDAR analysis and a subsequent survey with the Trimble GeoXH 6000 confirmed the north-easterly summit as higher:

North-easterly summit; Cae Alen:  129.1m at SH 78116 75814

South-westerly summit; Bwlch Mawr:  128.4m at SH 77790 75561

This comes within the parameters of the Summit Relocations used within this page heading, these parameters are:

The term Summit Relocations applies to any listed hill whose summit meets the following criteria; where there are a number of potential summit positions within close proximity and the highest point is not where previously given, 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, or when the summit of the hill is in a different field compared to where previously given, or when the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct.  As heights on different scaled Ordnance Survey maps are not consistent the height given on the 1:25,000 Explorer map is being prioritised in favour of the 1:50,000 Landranger map for detailing these relocations.

The Trimble GeoXH 6000 gathering data at the summit of Cae Alen

The Trimble GeoXH 6000 gathering data at the summit of Bwlch Mawr

Therefore the height produced by the Trimble GeoXH 6000 survey is 129.1m positioned at SH 78116 758124, this position is given a 130m spot height on contemporary Ordnance Survey maps and is approximately 400m north-east from where the previously listed summit position is situated which was surveyed as being 128.4m in height and positioned at SH 77790 75561.

The full details for the hill are:

Group:  Carneddau

Name:  Cae Alen

OS 1:50,000 map:  115

Summit Height:  129.1m (converted to OSGM15)

Summit Grid Reference (new position):  SH 78116 75814

Bwlch Height:  34.8m (LIDAR)

Bwlch Grid Reference:  SH 77629 74003 (LIDAR)

Drop:  94.3m (Trimble summit and LIDAR bwlch)

For details of the summit survey of this hill

Myrddyn Phillips (April 2019)

Mapping Mountains – Summit Relocations – Y Trechol – The Dominant Hills of Wales

Cae Alen (SH 781 758)

There has been a Summit Relocation to a hill that is listed in the Y Trechol – The Dominant Hills of Wales, with the summit height, its location, the drop and status of the hill confirmed by LIDAR analysis, and a subsequent summit survey with the Trimble GeoXH 6000 conducted by Myrddyn Phillips, with the latter taking place on the 10^th October 2018.

LIDAR image of Cae Alen, Bwlch Mawr and Bryn Eithin

The criteria for the list that this summit relocation applies to are:

               

Y Trechol – The Dominant Hills of Wales – Welsh P30 hills whose prominence equal or exceed half that of their absolute height.  With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height.  The list is authored by Myrddyn Phillips with the Introduction to the start of the Mapping Mountains publication of this list appearing on the 3^rd December 2015.

The name of the bounded land where the summit of this hill is situated is Cae Alen and this was derived from the Tithe map, and it is this name that the hill is now listed by.  The hill is adjoined to the Carneddau group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the B5106 road to its west and the Afon Conwy (River Conwy) to its east, and has the town of Conwy towards its north.

This summit relocation relates to three points, two of which are adjoined with the most northerly given a 130m summit spot height positioned at SH 781 758 on contemporary Ordnance Survey maps, this is adjoined to the central point which is given a small uppermost 130m ring contour positioned at SH 777 755, whilst the most southerly point is a separate P30 and also given a small uppermost 130m ring contour positioned at SH 775 752.

When the origin 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, two of these points were listed as separate P30s; with the northerly 130m map heighted summit positioned at SH 781 758 being prioritised over that of the central point positioned at SH 777 755.

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

The details for these hills were re-assessed when the Ordnance Survey Vector Map Local became available online, this map is hosted on the Geograph website and is entitled the Interactive Coverage Map, and as an uppermost contour ring should be prioritised over that of a same map heighted spot height the central point positioned at SH 777 755 was now prioritised for P30 status over the northerly 130m spot heighted point positioned at SH 781 758.  However, it was the southerly summit positioned at SH 775 752 that was now prioritised over the central summit positioned at SH 777 755 for Dominant status.

It was not until LIDAR became available and analysed that the details for these hills 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 image of Bryn Eithin

The height produced by LIDAR analysis and a subsequent survey with the Trimble GeoXH 6000 confirmed the northerly summit as higher:

Northerly summit; Cae Alen:  129.1m at SH 78116 75814

Central summit; Bwlch Mawr:  128.4m at SH 77790 75561

Southerly summit; Bryn Eithin:  128.5m at SH 77584 75224

This comes within the parameters of the Summit Relocations used within this page heading, these parameters are:

The term Summit Relocations applies to any listed hill whose summit meets the following criteria; where there are a number of potential summit positions within close proximity and the highest point is not where previously given, 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, or when the summit of the hill is in a different field compared to where previously given, or when the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct.  As heights on different scaled Ordnance Survey maps are not consistent the height given on the 1:25,000 Explorer map is being prioritised in favour of the 1:50,000 Landranger map for detailing these relocations.

The Trimble GeoXH 6000 gathering data at the summit of Cae Alen

The Trimble GeoXH 6000 gathering data at the summit of Bryn Eithin

Therefore the height produced by the Trimble GeoXH 6000 survey is 129.1m positioned at SH 78116 75814, this position is given a 130m spot height on contemporary Ordnance Survey maps and is approximately 800m north-east from where the previously listed Dominant summit is situated which was surveyed as being 128.5m in height and positioned at SH 77584 75224.

The full details for the hill are:

Group:  Carneddau

Name:  Cae Alen

OS 1:50,000 map:  115

Summit Height:  129.1m (converted to OSGM15)

Summit Grid Reference (new position):  SH 78116 75814

Bwlch Height:  34.8m (LIDAR)

Bwlch Grid Reference:  SH 77629 74003 (LIDAR)

Drop:  94.3m (Trimble summit and LIDAR bwlch)

Dominance:  73.05% (Trimble summit and LIDAR bwlch)

For details of the summit survey of this hill

Myrddyn Phillips (April 2019)

Mapping Mountains – Significant Name Changes – 100m Twmpau and Y Trechol – The Dominant Hills of Wales

Cae Alen (SH 781 758)

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, its location, the drop and status of the hill confirmed by LIDAR analysis, and a subsequent summit survey with the Trimble GeoXH 6000 conducted by Myrddyn Phillips, with the latter taking place on the 10^th October 2018.

Cae Alen (SH 781 758)

The criteria for the two listings that this name change applies to are:

               

100m Twmpau - Welsh hills at or above 100m and below 200m in height with 30m minimum drop, with an accompanying sub list entitled the 100m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 100m and below 200m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

Y Trechol – The Dominant Hills of Wales – Welsh P30 hills whose prominence equal or exceed half that of their absolute height.  With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height.  The list is authored by Myrddyn Phillips with the Introduction to the start of the Mapping Mountains publication of this list appearing on the 3^rd December 2015.

The hill is adjoined to the Carneddau group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with the B5106 road to its west and the Afon Conwy (River Conwy) to its east, and has the town of Conwy towards its north.

The hill originally appeared in the 100m P30 list on Geoff Crowder’s v-g.me website under the directional name of Iolyn Park North East Top, with an accompanying note stating Name from camp site to the South-West.

Iolyn Park North East top

130m

SH781758

115

17

Name from camp site to the South-West

  

During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them, or as in this instance use a directional name based on what I presumed was the name of a camp site toward the south-west.  This is not a practice that I now advocate as with time and inclination place-name data can be improved either by asking local people or by examining historic documents, through this form of research an appropriate name for the hill can usually be found.

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

As the summit of this hill comprises bounded land the details for it were examined on the Tithe map.  The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act.  This act allowed tithes to be paid in cash rather than goods.  The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land.  This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales.

Extract from the Tithe map

The enclosed land where the summit of this hill is situated is given the number 79 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land.  The land where the summit of this hill is situated is named as Cae alen in the apportionments, with the details on the Tithe map appearing in the parish of Gyffin and in the county named as Carnarvon [sic].

Extract from the apportionments

Therefore, the name this hill is now listed by in the 100m Twmpau and Y Trechol – The Dominant Hills of Wales is Cae Alen, and this was derived from the Tithe map.

The full details for the hill are:

Group:  Carneddau

Name:  Cae Alen

Previously Listed Name:  Iolyn Park North East Top 

OS 1:50,000 map:  115

Summit Height:  129.1m (converted to OSGM15)

Summit Grid Reference:  SH 78116 75814

Bwlch Height:  34.8m (LIDAR)

Bwlch Grid Reference:  SH 77629 74003 (LIDAR)

 

Drop:  94.3m (Trimble summit and LIDAR bwlch)

Dominance:  73.05% (Trimble summit and LIDAR bwlch)

For details of the summit survey of this hill

Myrddyn Phillips (April 2019)

Mapping Mountains – Hill Reclassifications – Humps

Iolyn Park relocated to SH 781 758 – Subhump relocation

This is the thirty third in a series of Hill Reclassification and Summit Relocation posts that detail hills whose status or location has either been altered in the listing of the Humps (HUndred Metre Prominences) through map study and / or surveys that I have instigated, or it is the recommendation that their status is altered.

The summit of the Subhump named Iolyn Park is now relocated to the grazing field on the right in the background of this photo

The hill name used in this and forthcoming posts is that used in the listing of Humps, therefore individual names and their composition may not match those that are used in listings I am directly associated with.  However, I am of firm belief that listed hill names used by other authors should be respected when giving detail within other people’s lists, however inappropriate some hill names may be considered.

Many preceding posts detailing these alterations to the Humps are retrospective as these hill reclassifications and summit relocations were either initiated from studying the Ordnance Survey Interactive Coverage Map that is hosted on the Geograph website, or initiated from a survey with the Trimble GeoXH 6000, and for this summit relocation that affects the Humps the survey of this hill took place on the 10.10.18, with the recommendation of this summit relocation posted on the Tump Yahoo Group forum on the 13.10.18.

The listing of Humps was published in book format by Lulu in 2009 and entitled More Relative Hills of Britain, its author; Mark Jackson gives credit to a number of people who contributed toward the formation of this list, these include; Eric Yeaman, Alan Dawson, Clem Clements, Rob Woodall, Bernie Hughes, Pete Ridges and others.  When the list was published in book format there were 2987 Humps listed with their criteria being any British hill that has 100m or more of drop, accompanying the main list is a sub category entitled Subhumps, with the criteria being any British hill that has 90m or more and below 100m of drop.

More Relative Hills of Britain by Mark Jackson

The details for the summit relocation appear below:

There has been a summit relocation to the listing of the Humps (HUndred Metre Prominences) instigated by a survey with the Trimble GeoXH 6000 conducted by Myrddyn Phillips and which took place on the 10.10.18.

This summit relocation applies to two summits that also have a third adjoining summit all of similar map height that are orientated north to south with a northern, central and southern summit.  These three summits and their map details appear below:

Northern summit:  130m spot summit positioned at SH 78114 75813

Central summit:  130m ring contour positioned at SH 77799 75564

Southern summit:  130m ring contour positioned at SH 77584 75224

Mark Jackson gave the following details to these summits when he first collated the list of Tumps:

Northern summit:  Iolyn Park NE Top with 130m summit at SH 781 758 with c 34m of drop

Central summit:  not listed

Southern summit:  Iolyn Park with c 131m summit at SH 776 752 with c 97m of drop

The two hills listed in the original Tumps match those that Myrddyn Phillips listed in the original list of Welsh P30 hills that superseded the Tumps by a number of years.  The details in the Tumps were amended on the 25.11.12 and 19.11.13 resulting in the following:

Northern summit:  not listed

Central summit:  Iolyn Park with 130m summit at SH 777 755 with 96m of drop

Southern summit:  Gorse Hill with 130m summit at SH 775 752 with 33m of drop

Therefore at the time of the Trimble GeoXH 6000 survey on the 10.10.18 the Subhump was listed as Iolyn Park with a 130m summit positioned at SH 777 755 with 96m of drop.

These three summits were surveyed using the Trimble GeoXH 6000 resulting in the following:

Northern summit:  129.073m summit at SH 78116 75814

Central summit:  128.446m summit at SH 77790 75561

Southerly summit:  128.459m summit at SH 77584 75224

The Trimble GeoXH 6000 set-up position at the northerly summit which is now the relocated summit of the Subhump

The Trimble GeoXH 6000 set-up position at the central summit which was the old summit of the Subhump

The Trimble GeoXH 6000 set-up position at the southerly summit which was originally listed in the Tumps with c 97m of drop

The Subhump is listed under the name of Iolyn Park; this name appears on contemporary Ordnance Survey maps adjacent to land where the southern summit is situated.  However, research via the Tithe map and local enquiries with the owner of the Gorse Hill Caravan Park has resulted in the following names:

Northern summit:  Cae Alen (Tithe map)

Central summit:  Bwlch Mawr (Tithe map and local enquiry)

Southern summit:  Bryn Eithin (English map name and local enquiry)

These three summits are adjoined to the Carneddau range of hills and they are situated overlooking the Afon Conwy to the east and the B5106 road to the west, and have the town of Conwy towards the north.

The summit relocation of the Subhump was accepted and its new summit position augmented in to the listing of the Humps on the 31.10.18.

The full details for the hill are:

Name:  Iolyn Park (as listed in the Humps)

OS 1:50,000 map:  115

OS 1:25,000 map:  17

Summit Height:  129.0m (as listed in the Humps, with the Trimble survey giving 129.1m)

Summit Grid Reference:  SH 781 758 (as listed in the Humps, with the Trimble giving SH 78116 75814)

Bwlch Height:  34m (as listed in the Humps, with LIDAR giving 34.8m)

Bwlch Grid Reference:  SH 776 740 (as listed in the Humps, with LIDAR giving SH 77629 74003)

Drop:  95m (as listed in the Humps, with Trimble summit and LIDAR bwlch giving 94.3m drop)

Myrddyn Phillips (February 2019)