Myrddyn Phillips - Mapping Mountains: Redding

Showing posts with label Redding. Show all posts

Saturday, 6 July 2019

Mapping Mountains – Significant Name Changes – 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales

Redding (ST 087 776)

There has been a Significant Name Change to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, 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 Redding (ST 087 776)

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

30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 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.

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 Cymoedd Morgannwg group of hills, which are situated in the central part of South Wales (Region C, Sub-Region C2), and it has the M4 towards its north-west and the A4232 road to its east, and has the city of Caerdydd (Cardiff) towards its east.

The hill originally appeared in the 30-99m P30 list on Geoff Crowder’s v-g.me website under the partly invented and transposed name of Palla Farm Top, with an accompanying note stating; Name from farm at summit.

Palla Farm Top

81m

SO088776

170

151

Name from farm at summit

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 add the word Top 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 3 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 Redding (mistakenly transposed as two Acres in the pop-up window accompanying the Tithe) in the apportionments, with the details on the Tithe map appearing in the parish of Peterstone super Ely and in the county named as Glamorgan.

Extract from the apportionments

Therefore, the name this hill is now listed by in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales is Redding, and this name was derived from the Tithe map.

The full details for the hill are:

Group: Cymoedd Morgannwg

Name: Redding

Previously Listed Name: Palla Farm Top

OS 1:50,000 map: 170

Summit Height: 80.3m (LIDAR)

Summit Grid Reference: ST 08782 77683 (LIDAR, natural summit)

Bwlch Height: 49.05m (LIDAR)

Bwlch Grid Reference: ST 08551 79827 (LIDAR)

Drop: 31.3m (LIDAR)

Dominance: 38.94% (LIDAR)

Myrddyn Phillips (July 2019)

Sunday, 30 June 2019

Mapping Mountains – Hill Reclassifications – 30-99m Twmpau

Redding (ST 087 776) – 30-99m Sub-Twmpau reclassified to 30-99m Twmpau

There has been confirmation of 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 confirmed by LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Redding

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

The name of the bounded land where the summit of this hill is situated is Redding, and this was derived from the Tithe map and it is this name that the hill is now being listed by. The hill is adjoined to the Cymoedd Morgannwg group of hills, which are situated in the central part of South Wales (Region C, Sub-Region C2), and it has the M4 towards its north-west and the A4232 road to its east, and has the city of Caerdydd (Cardiff) towards its east.

This hill was included in the accompanying Hills to be surveyed sub list when the original Welsh 30-99m P30 hills were published on Geoff Crowder’s v-g.me website, as it did not meet the criteria then used for the main P30 list. The sub list has now been standardised and interpolated drop values and interpolated summit heights have also been included in the main P30 and sub list.

When interpolated heights were used in this list this hill was listed with an estimated c 30m of drop, based on the 81m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 51m based on interpolation of bwlch contouring between 50m – 55m.

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

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website became available online; this mapping is entitled the Interactive Coverage Map, and its larger scale enabled a better assessment of bwlch contouring, this resulted in the same estimated c 51m bwlch height giving this hill the same estimated drop value of c 30m.

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 confirmation of this hill’s reclassification to 30-99m Twmpau status is due to LIDAR analysis, resulting in an 80.3m summit height and a 49.05m bwlch height, with these values giving this hill 31.3m of drop.