Showing posts with label Pared y Cefn Hir. Show all posts
Showing posts with label Pared y Cefn Hir. Show all posts

Monday, 7 March 2022

Mapping Mountains – Significant Height Revisions – Y Trichant – The 300m Hills of Wales

 

Pared y Cefn Hir (SH 665 152) 

There has been a Significant Height Revision 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 derived from LIDAR analysis conducted by Myrddyn Phillips. 

Pared y Cefn Hir (SH 665 152)

The criteria for the list that this height revision 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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1st January 2022. 

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

The name the hill is listed by is Pared y Cefn Hir, and it is adjoined to the Cadair Idris group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its north-west and minor roads to its south-west, south-east and east, and has the town of Abermaw (Barmouth) towards the west north-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list.  After 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 an estimated c 374m summit height based on interpolation of the uppermost 370m contour that appears 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 Pared y Cefn Hir (SH 665 152)

LIDAR analysis gives the summit height of this hill as 379.0m and this comes within the parameters of the Significant Height Revisions used within this page heading, these parameters are: 

The term Significant Height Revisions applies to any listed hill whose interpolated summit height and Ordnance Survey or Harvey map summit spot height, has a 2m or more discrepancy when compared to the survey result produced by the Trimble GeoXH 6000 or analysis of data produced via LIDAR.  Also included are hills whose summit map data is missing an uppermost ring contour when compared to the data produced by the Trimble or by LIDAR analysis. 

Therefore, the new listed summit height of this hill is 379.0m and this was derived from LIDAR analysis, this is 5.0m higher than the previously listed summit height of c 374m which was estimated from interpolation of the uppermost 370m contour that appears on the contemporary Ordnance Survey 1:25,000 Explorer map. 

 

The full details for the hill are: 

Group:  Cadair Idris 

Name:  Pared y Cefn Hir 

OS 1:50,000 map:  124

Summit Height (New Height):  379.0m (LIDAR)                                                           

Summit Grid Reference:  SH 66579 15214 (LIDAR) 

Bwlch Height:  358.4m (LIDAR) 

Bwlch Grid Reference:  SH 66538 15146 (LIDAR) 

Drop:  20.5m (LIDAR) 

 

Myrddyn Phillips (March 2022)

 

 

 

 

 

 

 

 

 

Friday, 4 March 2022

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

 

Pared y Cefn Hir (SH 665 152) – Sub-Trichant addition

There has been 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. 

Pared y Cefn Hir (SH 665 152)

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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1st January 2022. 

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

The name the hill is listed by is Pared y Cefn Hir, and it is adjoined to the Cadair Idris group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its north-west and minor roads to its south-west, south-east and east, and has the town of Abermaw (Barmouth) towards the west north-west. 

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, 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-evaluated and it was listed with an estimated c 15m of drop, based on an estimated c 374m summit height and an estimated c 359m bwlch height, with both heights 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 Pared y Cefn Hir (SH 665 152)

Therefore, the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 379.0m summit height and a 358.4m bwlch height, with these values giving this hill 20.5m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Cadair Idris 

Name:  Pared y Cefn Hir 

OS 1:50,000 map:  124

Summit Height:  379.0m (LIDAR)                                                           

Summit Grid Reference:  SH 66579 15214 (LIDAR) 

Bwlch Height:  358.4m (LIDAR) 

Bwlch Grid Reference:  SH 66538 15146 (LIDAR) 

Drop:  20.5m (LIDAR) 

 

Myrddyn Phillips (March 2022)

 

 

 

 

 

 

 

Tuesday, 1 March 2022

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

 

Pared y Cefn Hir (SH 661 148) – Sub-Trichant reclassified to Trichant

There has been confirmation of a reclassification 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 detail on contemporary maps produced from Ordnance Survey data and a subsequent Leica GS15 survey conducted by John Barnard, Graham Jackson and Myrddyn Phillips. 

Pared y Cefn Hir (SH 661 148)

The criteria for the list that this reclassification 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, and the Introduction to the Mapping Mountains publication of the list appearing on the 1st January 2022. 

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

The name the hill is listed by is Pared y Cefn Hir, and it is adjoined to the Cadair Idris group of hills, which are situated in the south-western part of North Wales (Region A, Sub-Region A3), and it is positioned with the A493 road to its north-west and minor roads to its south-west, south-east and east, and has the town of Abermaw (Barmouth) towards the west north-west. 

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for the main P30 category, with the 383m map heighted Bryn Brith (SH 664 153) listed as the prioritised P30. 

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 an estimated c 39m of drop, based on an estimated c 381m summit height and an estimated c 342 bwlch height, with both heights 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

Since the original publication of the Welsh P30 lists on Geoff Crowder’s v-g.me website there have been a number of maps made available online.  Some of these are historic such as the series of Six-Inch maps on the National Library of Scotland website.  Whilst others were digitally updated such as the Ordnance Survey Vector Map Local that was hosted on the Geograph website and which was entitled the Interactive Coverage Map, whilst others are current and digitally updated such as the interactive mapping on the Magic Maps and WalkLakes websites. 

The details for this hill were re-assessed when the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available Ordnance Survey maps and for this hill it had a 383m summit spot height and therefore it became twinned with the 383m map heighted Bryn Brith positioned at SH 664 153.  This spot height is also represented on the interactive mapping on the Magic Maps website. 

Extract from the Magic Maps website

Due to the twinning of Pared y Cefn Hir and Bryn Brith and the marginal Submarilyn status of the higher summit these hills were prioritised for a GNSS survey and this took place over two days and was conducted by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica GS15, resulting in Pared y Cefn Hir being confirmed as the higher summit and the drop value confirmed as just below the 150m required for Marilyn status. 

Gathering data on the summit area of Pared y Cefn Hir with the offset between the set-up position and high point noted

Therefore, the confirmation of the reclassification of this hill from Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data and a subsequent Leica GS15 survey, resulting in a 383.1m summit height and a 233.7m bwlch height, with these values giving this hill 149.4m of drop, which is sufficient for it to be classified as a Trichant. 

 

The full details for the hill are: 

Group:  Cadair Idris 

Name:  Pared y Cefn Hir 

OS 1:50,000 map:  124

Summit Height:  383.1m (Leica GS15)                                                           

Summit Grid Reference:  SH 66199 14885 (Leica GS15) 

Bwlch Height:  233.7m (Leica GS15) 

Bwlch Grid Reference:  SH 65822 14423 (Leica GS15) 

Drop:  149.4m (Leica GS15) 

 

Myrddyn Phillips (March 2022)

 

 

Saturday, 7 April 2018

Mapping Mountains – Trimble Surveys – Cadair Idris


Rob Woodall Completes the Welsh Mainland Tumps

18.02.18  Pared y Cefn Hir (SH 661 148, only bwlch Trimbled), Ffridd Bellau Nant y Gwyrddail (SH 665 139, previously Trimbled) and Ffridd Las (SH 660 139, previously Trimbled)


Ffridd Las (SH 660 139)

Today was quite a momentous one in the annals of hill bagging as Rob Woodall completed the Welsh mainland Tumps, a staggering undertaking with 2,271 hills listed as of the time of completion.

The hill Rob chose for this completion remains unnamed on Ordnance Survey maps, and is known as Ffridd Las by the farmer who grazes sheep on the hill, it is listed as Pen Llynnau Cregennen in the Tumps.

The farmer who grazes Ffridd Las lives at the small farm house of Ffridd Boedel, which is situated beside and directly below the hill to its north-west, and on my way to the lakeside car park where Rob had suggested we all meet, I called at this house and met Carys Lloyd.  We chatted for a number of minutes and I explained my interest in upland place-name research, she kindly suggested I call back nearer lunchtime as her husband; Arwyn, would be in and could help me.

A few minutes later I drove in to the lakeside car park adjacent to the double lakes of Llynnau Cregennan, the day looked fair until early afternoon when light rain was forecast.  This at least was more favourable when compared to recent weather reports as persistent rain and hill mist had been forecast for the morning and remainder of the day.

The positioning of Llynnau Cregennan are beautiful as they sit nestled in the landscape with the looming profile of Pared y Cefn Hir overlooking to the north-east and the higher satellite peaks of Cadair Idris to their south-east.  But it is Pared y Cefn Hir that stands out, butted skyward it defies its relatively lowly height.  Whilst Ffridd Las is almost inconsequential in comparison, a grassed domed small hill beside the minor road that skirts the lakes.  However, this is the appealing factor of the Welsh P30s as they take in small and high hills alike, rock strewn giants and mere grassed grazing fields, well-trodden paths and seldom visited places, and it is their variety that encourages investigation.

Pared y Cefn Hir and the northerly of the Llynnau Cregennan

Rob had suggested extending his walk over Pared y Cefn Hir and its adjacent hill of Bryn Brith, before visiting Ffridd Bellau Nant y Gwyrddail, followed by his last hill; Ffridd Las.  I decided to bi-pass the first two hills of the walk and join the festivities on the last two; this would give me time to visit the small farm house of Ffridd Boedel where I hoped to meet Arwyn Lloyd and confirm the name of the hill that Rob was finishing on.

As the party set off toward Pared y Cefn Hir I remained in the car park chatting with Gordon Adshead who, like me, planned on visiting the last two hills at his leisure.  The morning was ideal for such a walk with the tops clear of clag and a gentle winter light adding substance to the beautiful landscape.

As Rob and friends began to get strung out on their way up Pared y Cefn Hir I sauntered down to the larger and more northerly of the double lakes and watched as a cloud blanket cascaded over the cliffs of Mynydd Moel, a slow and delicate ebb of morning mist following the upper contours of the hill.

Rob and party heading up Pared y Cefn Hir

Although I hadn’t planned on doing so I realised that with time on my hands I could gather a data set from the critical bwlch of Pared y Cefn Hir, this is positioned at the outflow of the northern and larger lake.  This position had been surveyed in November 2012 when along with John Barnard and Graham Jackson we spent two days surveying the summits of Pared y Cefn Hir and Bryn Brith and three potential positions of the higher of these two hills connecting bwlch.

Gathering data with the Leica GS15

As I approached the outflow I looked up and Rob and friends were just cresting the summit ridge of Pared y Cefn Hir, I positioned the Trimble on the upper part of the concrete surround at the outflow to the northern lake, thankfully the concrete surround was just wide enough for the Trimble to be positioned without any possibility of being dislodged.

After measuring the offset between the Trimble’s internal antenna and the gravel and rock at the base of the water I stood back and waited for it to attain the 0.1m accuracy level before data should be logged, this was achieved relatively quickly and after pressing ‘Log’ I wandered away from the equipment’s quiet beeps and happily contented myself with taking photos across the water to the grassed and curved profile of Ffridd Las.

The bwlch of Pared y Cefn Hir

Initially I planned on collecting five minutes of data, but as I had no time constraint I thought ten minutes would be sufficient.  During data collection a couple walked my way on the narrow minor road, they stopped and we chatted, by the time they headed off over 20 minutes of data had been gathered, I then decided that a 30 minute data set would be good!

Gathering data at the critical bwlch of Pared y Cefn Hir

Once data were stored and the Trimble packed away I walked up the road to Ffridd Boedel where Arwyn met me in his slippers, after explaining my interest in the names of adjacent hills he put his boots on and we spent a contented 30 minutes above his farm talking about the hills, their names, the ffriddoedd and his life as a farmer.

Arwyn Lloyd of Ffridd Boedel

I only left when we spotted the large party descending Pared y Cefn Hir and taking the path heading east around the northern shore of the larger lake, realising that they were not heading up the minor road where I planned on joining them I thanked Arwyn for his time and then headed toward the summit of Ffridd Bellau Nant y Gwyrddail.

As I approached the summit of Rob’s penultimate Welsh mainland Tump the strung our party were rounding the shore of the southerly lake and heading up the south-west flank of the hill.  They were soon on the summit.

Approaching the summit of Ffridd Bellau Nant y Gwyrddail

At the summit of Ffridd Bellau Nant y Gwyrddail

All that remained was the walk back down from the summit of Ffridd Bellau Nant y Gwyrddail and the short walk over toward the summit of Ffridd Las, the last hill of many for Rob, all 2,271 of them!

Rob was greeted at the summit of Ffridd Las by 14 people with the customary arch of ceremonial walking poles leading toward the high point of the hill; this was a fitting end to an unprecedented achievement.  We stood and sat beside the summit sampling a variety of cake toasting Rob’s latest amongst many incredible achievements.

At the summit of Ffridd Las

Rob completes the Welsh mainland Tumps on the summit of Ffridd Las

Visiting the Welsh P30s is something that I have enjoyed for many years, their variety seems to have no bounds, and they have brought me so many enjoyable experiences, with each one however small in height or grand in stature bringing its own unique charm and ambiance.  To have visited them all on the mainland must be such a fulfilling experience and my congratulations go out to Rob for being the first person to have done so.    
 
   
Survey Result:


Pared y Cefn Hir

Summit Height:  383.1m (converted to OSGM15, from previous Leica GS15 survey) (Sub-Trichant reclassified to Trichant)

Summit Grid Reference:  SH 66199 14885 (from previous Leica GS15 survey)

Bwlch Height:  233.7m (converted to OSGM15, Trimble GeoXH 6000)  233.7m (converted to OSGM15, Leica GS15)

Bwlch Grid Reference:  SH 65822 14423 (Trimble GeoXH 6000 and previous Leica GS15 survey)

Drop:  149.4m (from previous Leica GS15 survey)

Dominance:  39.00% (from previous Leica GS15 survey)