Showing posts with label Ffridd Uchaf (SH 993 500). Show all posts
Showing posts with label Ffridd Uchaf (SH 993 500). Show all posts

Wednesday, 15 July 2020

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


Fridd Uchaf (SH 993 500)

There has been a Significant Name Change to a hill that is now 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 conducted by Myrddyn Phillips.

LIDAR image of Ffridd Uchaf (SH 993 500)

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 13th May 2017.

The hill is adjoined to the Mynydd Hiraethog group of hills which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the B4501 road to its west and the B5105 road to its south, and has the village of Llanfihangel Glyn Myfyr towards the south.

The hill was not included in the Hills to be surveyed sub list that accompanied the original Welsh 300m P30 list published on Geoff Crowder’s v-g.me website, as it was considered not to meet the criteria then used in this sub category.  It was later listed by the point (Pt. 375m) notation when the P30 lists were re-assessed.

Extract from the Ordnance Survey 1:50,000 Landranger map

As this hill comprises bounded land the Tithe map was consulted.  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 697 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 Ffridd Uchaf in the apportionments, with the details on the Tithe map appearing in the parish of Glyn Myfyr and in the counties named as Denbigh and Merioneth.

Extract from the apportionments

Therefore, the name this hill is now listed by in the Y Trichant – The 300m Hills of Wales is Ffridd Uchaf, and this was derived from the Tithe map.


The full details for the hill are:

Group:  Mynydd Hiraethog

Name:  Ffridd Uchaf

Previously Listed Name:  Pt. 375m

OS 1:50,000 map:  116

Summit Height:  376.4m (LIDAR)

Summit Grid Reference:  SH 99378 50074 (LIDAR)

Bwlch Height:  350.5m (LIDAR)

Bwlch Grid Reference:  SH 99671 50547 (LIDAR)

Drop:  25.9m (LIDAR)


Myrddyn Phillips (July 2020)









Friday, 10 July 2020

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


Ffridd Uchaf (SH 993 500) – 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 confirmed by LIDAR analysis conducted by Myrddyn Phillips.

LIDAR image of Ffridd Uchaf (SH 993 500)

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 13th May 2017.

The name the hill is listed by is Ffridd Uchaf and this was derived from the Tithe map, and it is adjoined to the Mynydd Hiraethog group of hills which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the B4501 road to its west and the B5105 road to its south, and has the village of Llanfihangel Glyn Myfyr towards the south.

When the original 300m 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 that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

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 24m of drop, based on the 375m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger map and the 351m bwlch spot height that appeared at SH 99666 50565 on the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map.

Extract from the Ordnance Survey 1:50,000 Landranger 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 376.4m summit height and a 350.5m bwlch height, with these values giving this hill 25.9m of drop, which is sufficient for it to be classified as a Sub-Trichant.


The full details for the hill are:

Group:  Mynydd Hiraethog

Name:  Ffridd Uchaf

OS 1:50,000 map:  116

Summit Height:  376.4m (LIDAR)

Summit Grid Reference:  SH 99378 50074 (LIDAR)

Bwlch Height:  350.5m (LIDAR)

Bwlch Grid Reference:  SH 99671 50547 (LIDAR)

Drop:  25.9m (LIDAR)


Myrddyn Phillips (July 2020)