Mapping Mountains – Significant Name Changes – 30-99m Twmpau

Rhos Trebared (SN 173 475) 

There has been a Significant Name Change to a hill that is listed in the 30-99m Twmpau, 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 Rhos Trebared (SN 173 475)

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

30-99m Twmpau - Welsh hills at or above 30m and below 100m in height that have 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or above 30m and below 100m 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 30-99m Twmpau by Myrddyn Phillips

The hill is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the coast to its north-west, the B4548 road to its north-east and a minor road to its south, and has the town of Aberteifi (Cardigan) towards the south.

The hill appeared in the original Welsh 30-99m P30 list on Geoff Crowder’s v-g.me website, under the transposed name of Trebared, with an accompanying note stating; Name from buildings to the South-East.

Trebared

69m

SN174475

145

35/198

Name from buildings to the South-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 or as in this instance transpose the name of a farm and use it for that of the hill.  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

When compiling the list of the Y Trechol – The Dominant Hills of Wales I made place-name enquiries for a number of hills, including this one.  Subsequent LIDAR analysis has deleted this hill from Lesser Dominant status as its drop is insufficient for qualification.  However, the local enquiry made relating to the name of this hill is also used in the 30-99m Twmpau list.

I contacted Glen Johnson in relation to this hill and its name.  Glen had conducted a tremendous amount of research concentrating on the area surrounding Aberteifi (Cardigan).  He explained that the name Trebared is associated with a family named Bareth who lived in Aberteifi.  He had accessed records placing this family in this area as far back as the 1200’s.  Their name was recorded in 1302 as Bareth, this later mutated to Barret, which under soft mutation became Bared, and this latter name lends itself to the farm named Trebared, and this farm is now named Rhos Fach.  We then discussed the name of Rhos Trebared and Glen explained that although there is farmland to the south of the present day Rhos Fach, the name of Rhos Trebared would be taken from land above and up to the farm of Trebared.  Therefore, this land would at one time, be known as Rhos Trebared.

Therefore, the name this hill is now listed by in the 30-99m Twmpau is Rhos Trebared and this was derived from local enquiry. 

 

The full details for the hill are:

Group:  Mynydd Bach

Name:  Rhos Trebared

Previously Listed Name:  Trebared 

OS 1:50,000 map:  145

Summit Height:  70.3m (LIDAR) 

Summit Grid Reference:  SN 17391 47521 (LIDAR)               

Bwlch Height:  40.3m (LIDAR) 

Bwlch Grid Reference:  SN 17728 47659 (LIDAR) 

Drop:  29.9m (LIDAR) 

 

Myrddyn Phillips (February 2023)

 

 

 

 

 

  

Mapping Mountains – Hill Reclassifications – Y Trechol – The Dominant Hills of Wales

 

Rhos Trebared (SN 173 475) – Lesser Dominant deletion

There has been a deletion to the list of the Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Rhos Trebared (SN 173 475)

The criteria for the list that this deletion 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, and the list is now available in its entirety on Mapping Mountains in Google Doc format. 

Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips

The name the hill is now listed by is Rhos Trebared and this was derived from local enquiry, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the coast to its north-west, the B4548 road to its north-east and a minor road to its south, and has the town of Aberteifi (Cardigan) towards the south.

When the original 30-99m height band of Welsh P30 hills published on Geoff Crowder’s v-g.me website were standardised and interpolated heights and drop values also included, this hill was listed with 30m of drop and 43.48% dominance, based on the 69m summit spot height and the 39m bwlch spot height that appear on the Ordnance Survey 1:50,000 Landranger and 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 deletion of this hill from Lesser Dominant status is due to LIDAR analysis, resulting in a 70.3m summit height and a 40.3m bwlch height, with these values giving this hill 29.9m of drop, which is insufficient for this hill to be classified as a Lesser Dominant. 

 

The full details for the hill are:

Group:  Mynydd Bach

Name:  Rhos Trebared

OS 1:50,000 map:  145

Summit Height:  70.3m (LIDAR)

Summit Grid Reference:  SN 17391 47521 (LIDAR)

Bwlch Height:  40.3m (LIDAR)

Bwlch Grid Reference:  SN 17728 47659 (LIDAR)

Drop:  29.9m (LIDAR)

Dominance:  drop insufficient for qualification

 

Myrddyn Phillips (February 2023)

 

 

 

 

Mapping Mountains – Hill Reclassifications – 30-99m Twmpau

Rhos Trebared (SN 173 475) – 30-99m Twmpau reclassified to 30-99m Sub-Twmpau 

There has been a reclassification to the list of 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived by LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Rhos Trebared (SN 173 475)

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

30-99m Twmpau – Welsh hills at or above 30m and below 100m in height that have 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau, with the criteria for this sub category being all Welsh hills at or above 30m and below 100m 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 30-99m Twmpau by Myrddyn Phillips

The name the hill is now listed by is Rhos Trebared and this was derived from local enquiry, and it is adjoined to the Mynydd Bach group of hills, which are situated in the western part of South Wales (Region B, Sub-Region B1), and it is positioned with the coast to its north-west, the B4548 road to its north-east and a minor road to its south, and has the town of Aberteifi (Cardigan) towards the south.

When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was included in the main P30 list.

When the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 30m of drop, based on the 69m summit spot height and the 39m bwlch spot height that appear on the Ordnance Survey 1:50,000 Landranger and 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 reclassification of this hill to 30-99m Sub-Twmpau status is due to LIDAR analysis, resulting in a 70.3m summit height and a 40.3m bwlch height, with these values giving this hill 29.9m of drop, which is insufficient for it to be classified as a 30-99m Twmpau. 

 

The full details for the hill are: 

Group:  Mynydd Bach 

Name:  Rhos Trebared 

OS 1:50,000 map:  145

Summit Height:  70.3m (LIDAR) 

Summit Grid Reference:  SN 17391 47521 (LIDAR)               

Bwlch Height:  40.3m (LIDAR) 

Bwlch Grid Reference:  SN 17728 47659 (LIDAR) 

Drop:  29.9m (LIDAR) 

 

Myrddyn Phillips (February 2023)