Mapping Mountains – Significant Name Changes – 100m Twmpau

 

Pen Ucheldref (SH 558 773) 

There has been a Significant Name Change to a hill that is listed in the 100m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

The criteria for the list 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. 

The 100m Twmpau by Myrddyn Phillips

The hill is adjoined to the Ynys Môn group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with a minor road to its immediate south-east and the B5109 road to its immediate south-west, and has the village of Llanddona towards the north-east. 

When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed as Cae’r Ffynnon; a name that appeared near to the summit of this hill on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map, with 21m of drop, based on the 133m summit spot height and the 112m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map. 

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

During my early hill listing I paid little regard to name placement on the map, or the meaning of names and to what feature the name was appropriately applied to.  Therefore I prioritised names for listing purposes that I now understand are either inappropriate or where another name is viewed as being more appropriate. 

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 54 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 Pen Ucheldref in the apportionments, with the details on the Tithe map appearing in the parish of Llansadwrn and in the county named as Anglesey. 

Extract from the apportionments

Therefore, the name this hill is now listed by in the 100m Twmpau is Pen Ucheldref, and this was derived from the Tithe map, with Cae’r Ffynnon being the name of a farm positioned at SH 55656 77363 and Pen Ucheldref the name of a farm positioned at SH 55884 77174, with the Tithe naming the land where the summit of this hill is situated as Pen Ucheldref. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Pen Ucheldref

Previously Listed Name:  Cae’r Ffynnon 

OS 1:50,000 map:  114, 115

Summit Height:  133m (spot height) 

Summit Grid Reference:  SH 55805 77334 (spot height) 

Bwlch Height:  112m (spot height) 

Bwlch Grid Reference:  SH 57062 78438 (spot height) 

Drop:  21m (spot height summit and bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

 

 

 

 

 

Mapping Mountains – Summit Relocations – Y Trichant – The 300m Hills of Wales

 

Top Field (SJ 070 055) 

There has been confirmation of a summit position whose details can be included as a Summit Relocation to a hill that is listed in the Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Top Field (SJ 070 055)

The criteria for the list this summit relocation affects are:

Y Trichant- The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Top Field and this was derived from local enquiry, and it is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads, with the A458 road further to its north and the B4389 road further to its east, and has the small town of Llanfair Caereinion towards the east north-east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for the main P30 category. 

When the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 32m of drop based on the 335m summit spot height positioned at SJ 07085 05586 and an estimated c 303m bwlch height based on interpolation of 10m contouring that appear on the Ordnance Survey 1:25,000 Explorer map. 

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. 

LIDAR image of Top Field (SJ 070 055)

When on the hill the position of the summit given by LIDAR was surveyed using the Trimble GeoXH 6000 as well as another position that looked of similar height.  The second position was to an elevated mound above a small quarry and upon investigation it was decided that this was man-made.

 

The result for each position is given below: 

Natural summit:  333.257m at SJ 07082 05572 

Man-made elevated mound:  333.339m at SJ 07203 05559

 

The result produced by LIDAR analysis gives this hill a summit height of 333.1m, and as the natural summit has now been surveyed with the Trimble GeoXH 6000 it is this result that is being prioritised for listing purposes and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are: 

The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, to a different feature such as in a conifer plantation, placed within a different map contour, to a different point where a number of potential summit positions are within close proximity, or when natural ground or 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, 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. 

Gathering data with the Trimble GeoXH 6000 at the natural summit of Top Field

Gathering data with the Trimble GeoXH 6000 at the man-made mound

Therefore, the listed summit height of this hill is 333.3m and its confirmed position is SJ 07082 05572, this position is given a spot height on contemporary Ordnance Survey maps and is approximately 80 metres westward from where a slightly higher man-made mound is positioned. 

 

The full details for the hill are:

Group:  Carnedd Wen 

Name:  Top Field 

OS 1:50,000 map:  125

Summit Height:  333.3m (converted to OSGM15, Trimble GeoXH 6000)                                                      

Summit Grid Reference (Confirmed Position):  SJ 07082 05572 (Trimble GeoXH 6000) 

Bwlch Height:  301.1m (LIDAR) 

Bwlch Grid Reference:  SJ 06237 05273 (LIDAR) 

Drop:  32.2m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (March 2021)

 

Mapping Mountains – Hill Reclassifications – 100m Twmpau

Pen Ucheldref (SH 558 773) – 100m Sub-Twmpau addition 

There has been an addition to the list of 100m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data. 

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

100m Twmpau – Welsh hills at or above 100m and below 200m in height that have 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 100m Twmpau by Myrddyn Phillips

The name the hill is listed by is Pen Ucheldref and this was derived from the Tithe map, and it is adjoined to the Ynys Môn group of hills, which are situated in the north-western part of North Wales (Region A, Sub-Region A1), and it is positioned with a minor road to its immediate south-east and the B5109 road to its immediate south-west, and has the village of Llanddona towards the north-east. 

When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

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

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed with 21m of drop, based on the 133m summit spot height and the 112m bwlch spot height that appear on the Ordnance Survey 1:25,000 Explorer map. 

Therefore, the addition of this hill to 100m Sub-Twmpau status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 133m summit height and a 112m bwlch height, with these values giving this hill 21m of drop which is sufficient for it to be classified as a 100m Sub-Twmpau. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Pen Ucheldref 

OS 1:50,000 map:  114, 115

Summit Height:  133m (spot height) 

Summit Grid Reference:  SH 55805 77334 (spot height) 

Bwlch Height:  112m (spot height) 

Bwlch Grid Reference:  SH 57062 78438 (spot height) 

Drop:  21m (spot height summit and bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

 

 

 

  

Mapping Mountains – Hill Reclassifications – Y Trichant – The 300m Hills of Wales

 

Clogwyn Uchaf (SJ 262 459) – Sub-Trichant addition

There has been confirmation of an addition to the list of Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Clogwyn Uchaf (SJ 262 459)

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

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant, with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Clogwyn Uchaf and this was derived from the Tithe map, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with minor roads to its north-east and south, with the A539 road further to its south and the B5097 road further to its east, and has the village of Rhosllannerchrugog towards the east. 

When the original 300m height band of Welsh P30 hills was published on Geoff Crowder’s v-g.me website, this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, this hill was listed with an estimated c 24m of drop based on the 315m summit spot height and an estimated c 291m bwlch height based on interpolation of 5m contouring between 290m – 295m that appear on the Ordnance Survey 1:25,000 Explorer map. 

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 confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 314.4m summit height and a 289.5m bwlch height, with these values giving this hill 25.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Moel y Gamelin 

Name:  Clogwyn Uchaf 

OS 1:50,000 map:  117

Summit Height:  314.4m (LIDAR)                                                           

Summit Grid Reference:  SJ 26286 45940 (LIDAR) 

Bwlch Height:  289.5m (LIDAR) 

Bwlch Grid Reference:  SJ 26381 47029 (LIDAR) 

Drop:  25.0m (LIDAR) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

 

 

Mapping Mountains – Hill Reclassifications – 100m Twmpau

 

Mynydd Llwydiarth (SH 545 791) – 100m Sub-Twmpau addition 

There has been confirmation of an addition to the list of 100m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Mynydd Llwydiarth (SH 545 791)

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

100m Twmpau – Welsh hills at or above 100m and below 200m in height that have 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 100m Twmpau by Myrddyn Phillips

The name the hill is listed by is Mynydd Llwydiarth, and it is adjoined to the Ynys Môn 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 coast to its north, minor roads to its west and east and the B5109 road to its south, and has the village of Llanddona towards the east. 

When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category. 

After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed with an estimated c 22m of drop, based on an estimated c 155m summit height and an estimated c 133m bwlch height, the latter based on interpolation of 5m contouring between 130m – 135m that appear on the Ordnance Survey 1:25,000 Explorer map. 

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 confirmation of the addition of this hill to 100m Sub-Twmpau status is due to LIDAR analysis, resulting in a 156.1m summit height and a 132.6m bwlch height, with these values giving this hill 23.5m of drop which is sufficient for it to be classified as a 100m Sub-Twmpau. 

 

The full details for the hill are: 

Group:  Ynys Môn 

Name:  Mynydd Llwydiarth 

OS 1:50,000 map:  114, 115 

Summit Height:  156.1m (LIDAR) 

Summit Grid Reference:  SH 54519 79147 (LIDAR) 

Bwlch Height:  132.6m (LIDAR) 

Bwlch Grid Reference:  SH 54380 78960 (LIDAR) 

Drop:  23.5m (LIDAR) 

 

Myrddyn Phillips (March 2021)

 

 

 

Mapping Mountains – Significant Name Changes – Y Trichant – The 300m Hills of Wales

 

Top Field (SJ 070 055) 

There has been a Significant Name Change to a hill that is listed in the Y Trichant – The 300m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by LIDAR analysis and a subsequent Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Top Field (SJ 070 055)

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

Y Trichant – The 300m Hills of Wales.  Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13^th May 2017. 

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The hill is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads, with the A458 road further to its north and the B4389 road further to its east, and has the small town of Llanfair Caereinion towards the east north-east. 

The hill appeared in the original Welsh 300m P30 list published on Geoff Crowder’s v-g.me website, under the invented and transposed name of Bryn Rhiw-hiriaeth-uchaf, with an accompanying note stating; Name from buildings to the East.

Bryn Rhiw-hiriaeth-uchaf

335m

SJ071055

125

215

Name from buildings to the East

 

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 and as in this instance transpose the name of a farm and add the word Bryn.  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

This was one of a number of hills visited in the company of Alex Cameron during a day’s hill bagging.  After visiting the summit we headed back to my car where Alex put a brew on and whilst enjoying this and assorted accompaniments a tractor appeared chugging up the lane, once it safely negotiated the narrow gap between the paved section of road and my car I flagged it down.  The person driving the tractor was the local farmer; Owen Evans and he told me that unsurprisingly the hill has no individual name, but the field where the summit of the hill is situated is known as Top Field. 

Owen Evans

Therefore, the name this hill is now listed by in the Y Trichant – The 300m Hills of Wales is Top Field, and this was derived from local enquiry. 

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Top Field 

Previously Listed Name:  Bryn Rhiw-hiriaeth-uchaf 

OS 1:50,000 map:  125

Summit Height:  333.3m (converted to OSGM15, Trimble GeoXH 6000)                                                           

Summit Grid Reference:  SJ 07082 05572 (Trimble GeoXH 6000) 

Bwlch Height:  301.1m (LIDAR) 

Bwlch Grid Reference:  SJ 06237 05273 (LIDAR) 

Drop:  32.2m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

 

Myrddyn Phillips (March 2021)