Myrddyn Phillips - Mapping Mountains: Cae Ton Bach Ucha

Showing posts with label Cae Ton Bach Ucha. Show all posts

Saturday, 22 February 2025

Mapping Mountains – Significant Name Changes – 100m Twmpau

Cae Ton Bach Ucha (ST 320 991)

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 LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Cae Ton Bach Ucha (ST 320 991)

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 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. The list is authored by Myrddyn Phillips, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

100m Twmpau by Myrddyn Phillips

The hill is adjoined to the Cefn yr Ystrad group of hills, which are situated in the southern part of South Wales (Region B, Sub-Region B5), and it is positioned with a minor road to its north and the A4042 road to its west, and has the town of Pont-y-pŵl (Pontypool) towards the north north-west.

When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill appeared under the transposed and invented name of Sluvad Hill, with an accompanying note stating; Name from farm to the West.

Sluvad Hill

144m

ST321992

171

152

Name from farm to the 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, with little consideration for the meaning of the name and where it was appropriately applied to. 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 add the word Hill to it. 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 58 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 Ton Bach Ucha in the apportionments, with the details on the Tithe map appearing in the parish of Pant-teg and in the county named as Monmouthshire.

Extract from the apportionments

Therefore, the name this hill is now listed by in the 100m Twmpau is Cae Ton Bach Ucha, and this was derived from the Tithe map.

The full details for the hill are:

Group: Cefn yr Ystrad

Name: Cae Ton Bach Ucha

Previously Listed Name: Sluvad Hill

OS 1:50,000 map: 171

Summit Height: 144.6m (LIDAR)

Summit Grid Reference: ST 32053 99100 (LIDAR)

Bwlch Height: 106.0m (LIDAR)

Bwlch Grid Reference: ST 31267 99414 (LIDAR)

Drop: 38.6m (LIDAR)

Myrddyn Phillips (February 2025)

Saturday, 15 February 2025

Mapping Mountains – Summit Relocations – 100m Twmpau

Cae Ton Bach Ucha (ST 320 991)

There has been a Summit Relocation 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 LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Cae Ton Bach Ucha (ST 320 991)

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 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.

100m Twmpau by Myrddyn Phillips

The name the hill is now listed by is Cae Ton Bach Ucha, and this was derived from the Tithe map, and it is adjoined to the Cefn yr Ystrad group of hills, which are situated in the southern part of South Wales (Region B, Sub-Region B5), and it is positioned with a minor road to its north and the A4042 road to its west, and has the town of Pont-y-pŵl (Pontypool) towards the north north-west.

When the original Welsh 100m P30 list was published on Geoff Crowder’s v-g.me website, this hill was listed with a 144m summit height, based on the spot height positioned on a road at ST 32028 99148 that appears 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.

LIDAR summit image of Cae Ton Bach Ucha (ST 320 991)

LIDAR analysis gives the highest ground on this hill as 144.6m positioned at ST 32053 99100, and compared to its originally listed summit position this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:

The term Summit Relocations applies when the high point of the hill is found to be positioned; in a different field, to a different feature such as in a conifer plantation, within a different map contour either on Ordnance Survey maps or interactive mapping, to a different point where a number of potential summit positions are within close proximity, 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 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 height produced by LIDAR analysis to the summit of this hill is 144.6m and is positioned at ST 32053 99100, this is approximately 48 metres south-eastward and positioned to a different feature from where the originally listed summit is positioned.