Showing posts with label Esgair Cerrig. Show all posts
Showing posts with label Esgair Cerrig. Show all posts

Friday, 27 January 2017

Mapping Mountains – Summit Relocations – Y Pellenig - The Remotest Hills of Wales and Y Pedwarau - The 400m Hills of Wales


Esgair Cerrig (SN 952 432)

There has been a Summit Relocation initiated by LIDAR data analysed by Aled Williams and confirmed by a survey with the Trimble GeoXH 6000, to the listings of Y Pellennig and Y Pedwarau, with the survey that resulted in this summit relocation taking place on the 28th December 2016 in good, clear and bright conditions.

The two lists that this summit relocation affects are:

Y Pellennig - The Remotest Hills of Wales, with the criteria being all hills in Wales whose summit is 2.5km or more from the nearest paved public road that have a minimum 15m of drop.  This list is co-authored by Myrddyn Phillips and Aled Williams.

Y Pedwarau, with the criteria being all hills in Wales at and above 400m and below 500m in height that have a minimum 30m of drop.  This list is co-authored by Myrddyn Phillips and Aled Williams.

The name of the hill is Esgair Cerrig and this was derived from local enquiry (see Significant Name Changes) and access to it is restricted due to it being positioned within the confines of the Sennybridge Artillery Range Training Area.  The hill is situated in the Mynydd Epynt range, which is placed in the south-eastern part of Mid and West Wales (Region B, Sub-Region B2), and the hill is positioned above the small community of Llangamarch (Llangammarch Wells) to its north north-west and the small town of Llanwrtyd (Llanwrtyd Wells) to its west north-west. 

This hill’s summit position was previously given as SN 956 435 and this is where the current 456m spot height appears on Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps.  However, prior to the survey with the Trimble GeoXH 6000 this hill’s summit was analysed using LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.
 
Aled’s analysis of LIDAR data gives the hill the following details:


Esgair Cerrig

Summit Height:  456.3m

Summit Grid Reference:  SN 95226 43298


The analysis of LIDAR data pinpointed this hill’s position and its height was confirmed with the Trimble survey:


Esgair Cerrig

Summit Height:  456.4m (converted to OSGM15)

Summit Grid Reference:  SN 95224 43297 
    

Therefore the position of the relocated summit is at SN 95224 43297 and is featureless ground consisting of grass interspersed with reed grass beside a bomb crater, this position is within the uppermost 450m ring contour on Ordnance Survey maps although no spot height is given to it, the relocated summit is approximately 490 metres south-westward from where the previously listed summit is positioned.


The full details for the hill are:

Cardinal Hill:  Mynydd Epynt

Summit Height:  456.4m (converted to OSGM15)

Name:  Esgair Cerrig

OS 1:50,000 map:  147, 160

Summit Grid Reference (New Position):  SN 95224 43297 
     
Drop:  35.6m (converted to OSGM15)


The Trimble GeoXH 6000 gathering data at the summit of Esgair Cerrig, with the old position of the summit in the centre background of this photograph



Myrddyn Phillips and Aled Williams (January 2017)










Saturday, 21 January 2017

Mapping Mountains – Significant Name Changes – Y Pellennig - The Remotest Hills of Wales and Y Pedwarau - The 400m Hills of Wales


Esgair Cerrig (SN 952 432)

There has been a Significant Name Change to a hill that is listed in Y Pellennig - The Remotest Hills of Wales and the Y Pedwarau, with the summit height, drop and status of the hill being confirmed by a Trimble GeoXH 6000 survey which was conducted on the 28th December 2016, with the summit of the hill previously analysed via LIDAR data by Aled Williams.

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

Y Pellennig –The Remotest Hills of Wales comprise all Welsh hills whose summit is 2.5km or more from the nearest paved public road and which have a minimum 15m of drop.  The list is co-authored by Myrddyn Phillips and Aled Williams.

Y Pedwarau These are the Welsh hills at and above 400m and below 500m in height that have 30m minimum drop.  The list is co-authored by Myrddyn Phillips and Aled Williams, with the introduction to the Mapping Mountains publication of this list appearing on the 30th January 2017.

The hill is a part of the Mynydd Epynt range, this group of hills is situated in the south-eastern part of Mid and West Wales (Region B, Sub-Region B-2), and is positioned above the small community of Llangamarch (Llangammarch Wells) to the north north-west and the small town of Llanwrtyd (Llanwrtyd Wells) to the west north-west. 

Esgair Cerrig (SN 952 432)

The hill appeared in the 400m P30 list on Geoff Crowder’s v-g.me website under the name Twyn Rhyd-car North Top, with an accompanying note stating Name from hill to the south.  Hill list authors are prone to list a hill by the name that appears nearest to its summit on Ordnance Survey maps, without much consideration for its local or historical confirmation, or whether map placement is appropriate, and when the hill is unnamed on Ordnance Survey maps list authors are prone to either invent a name for the hill, supplant a name from a near feature that can result in an inappropriate name or they can use a directional name from a near named hill, and in the case of this hill it was the latter that I opted for, using the name of Twyn Rhyd Car and adding the directional element of North Top. 


Twyn Rhyd-car North Top
  456m
  147/160
188
  Name from hill to the South

  
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 historical documents, through this form of research an appropriate name for the hill can usually be found, and in the case of this hill it was a local farmer who gave the name Esgair Cerrig for land taking in the summit of this hill.

Therefore, the name this hill is now listed by in Y Pellennig - The Remotest Hills of Wales and Y Pedwarau is Esgair Cerrig and this was derived from local enquiry.


The full details for the hill are:

Group:  Mynydd Epynt

Name:  Esgair Cerrig

Previously Listed Name:  Twyn Rhyd-car North Top 

Summit Height:  456.4m (converted to OSGM15)

OS 1:50,000 map:  147, 160

Summit Grid Reference:  SN 95224 43297 
 
Drop:  35.6m (converted to OSGM15)





Myrddyn Phillips and Aled Williams (January 2017)








Friday, 6 January 2017

Mapping Mountains – Trimble Surveys – Mynydd Epynt



28.12.16  Mynydd Epynt (SN 961 464), Esgair Fawr (SN 927 433), Esgair Cerrig (SN 952 432), Twyn Rhyd Car (SN 960 422) and Drum Ddu (SN 979 447)


Esgair Fawr (SN 927 433)

As I clambered out of my car the chill breeze hit me and I shivered, and kept on doing so for the next ten minutes, but the view was sublime as a cloud enshrouded valley gave way to rising hill sides and the first throes of a rising sun edged the south-western horizon with a prospect of a good day ahead.

The cloud enshrouded valley

The rising sun

Banc y Cwm (SN 968 469)

I was meeting two friends for a walk over Mynydd Epynt, a land out of bounds for much of the year, but one whose hills are accessible over the Christmas period and we planned to take full advantage of the weather and the fact that the military do not frequent these hills at this time of year and visit as many Pedwarau as time would permit.

Once we had left a car next to the Drovers Arms we slowly made our way back on the frost encrusted road to the high point where a track gave access to Mynydd Epynt, which according to the map is the highest point of the hill range.

It was good to be on this hill range again as I’d only been on the land that is out of bounds once before, and that was a number of years ago on four of the north-easterly hills with two being within the Danger Area.

As we reached the summit of the first hill a Landrover pulled up and an enquiring farmer wondered if we knew where we were and more importantly where we were going, we chatted with the farmer and enquired about place-names whilst I set the Trimble up beside the small concrete pillar that marks the high point of the hill and proceeded to gather five minutes of data.

Gathering data at the summit of Mynydd Epynt

It was a stunning morning as the sun had now burst through any low lying cloud and the blue sky heralded a good day on the hill.  Our next hill was almost 5km south-westward, and the majority of the route was on the paved road that follows the northern escarpment of Mynydd Epynt and which now forms a part of the Epynt Way; this long distance path was created by the Ministry of Defence in 2004 and gives the public welcome access to a part of this hill range.

The road was a ribbon of white and stretched out toward the square blocked conifer plantations near the summit of Esgair Fawr, our second hill of the day.  To our north-west the valley was still submerged in mist and remained so all day, a testament to an ethereal other worldliness embedded in dulled cold.

The paved road following the northern escarpment of Mynydd Epynt


The mist enshrouded north-western valley

As we neared the trig pillar atop Esgair Fawr I knew I was in for a long day as a combination of cough, head cold, wonky knee, hip and neck, too much food intake over Christmas and lack of mountain fitness due to not being on the hill for a number of weeks meant that my two friends spent most of the day being patient, and having to wait for the sloth like creature that followed in their wake.

At least Trimbling each summit gave me a ten minute rest, but once data were gathered from the ground beside the trig pillar atop Esgair Fawr we plodded back across the upper hill onto the paved road and retraced our route to a prominent obelisk where we followed a track to the south-east that took us down to the connecting bwlch with our third hill of the day; Esgair Cerrig, we were now in the impact zone and dotted around us were discarded ordnance, but as long as you paid attention there doesn’t seem to be a major problem with walking these hills.

Gathering data at the summit of Esgair Fawr

Over the last few weeks, a colleague of mine had examined LIDAR data which has resulted in many reclassifications of hills, he had produced results for many of the summits and bylchau around the Epynt, and so I had decided to concentrate the Trimble surveys on the summits, and any bylchau where LIDAR data did not cover, and the next bwlch was one such example.

Gathering data at the critical bwlch of Esgair Cerrig

As the Trimble gathered data we had a glance at a wooden structure comprising two heads which was no doubt used for target practice, it felt odd to see something like this on a hill, but the ascent toward the summit of Esgair Cerrig brought home the nature of what happens on these hills as shell casings and various bits of ordnance were scattered amongst the moorland surroundings, but above all it was the bomb craters that stood out as one after another scattered the hillside, a place not to venture unless free of its usual goings on.

Target practice

The examination of LIDAR data had pinpointed the summit of Esgair Cerrig to be in the south-western part of its 450m uppermost map ring contour and not on the north-easterly part where the 456m spot height appears on current Ordnance Survey maps.  On our way to the high point we passed a rusting old tank and I set the Trimble up beside the debris of a bomb crater, I suppose there’s a first time for anything when out on the hill.

One of many bomb craters on Esgair Cerrig


Abandoned tank


Discarded ordnance


Gathering data at the summit of Esgair Cerrig

By now my physical strength was suffering, and after packing the Trimble away we headed toward Twyn Rhyd Car, our fourth hill of the day, this lay southward on the same ridge that descends from near to the obelisk on the northern escarpment, and a few sheep tracks headed toward its connecting bwlch, we looked ahead wondering what one to take and as an abandoned tank was on the ridge ahead we decided to ‘head for the tank’, another comment that is rarely heard when on the hill, this made me smile and kept me going as my two colleagues slowly pulled ahead of me.

'Head for the tank'

By the time I reached the summit of Twyn Rhyd Car I was slobbered and felt like curling up and falling asleep, however its summit needed Trimbling and there was still a long way to go to get back to the car at the Drover’s Arms.

Gathering data at the summit of Twyn Rhyd Car

We had one hill left to visit; Drum Ddu, and its summit lay distant, shimmering on the horizon a long way away, I knew I would suffer, and I did, but the valley we descended into was a pleasure to visit, it proved a quiet place with a prominent forgotten farm house named Byllfa-uchaf on the map, and we used this to aim for.  I tried to appreciate my surroundings, and although I did, my head was down and my body trance like as I plodded slowly after two ever smaller figures who had found an excellent narrow path on a raised earthen embankment that bi-passed much of the bog and tussocks.  After crossing a stream I lay on the opposing hillside and looked down the river valley as it extended south toward the grey silhouetted profile of the Beacons.  


Drum Ddu looked a long way away


The river valley extending south toward the Brecon Beacons


The wilds of the Epynt - a beautiful land

All too soon we were away hunting out a path that led up toward the summit of Drum Ddu, this uphill seemed never ending and my reserves of energy were now near empty and I had to stop and regain a semblance of dignity and breath even on the relatively flat sections, however the old adage of just take one step at a time is apt in such situations, even when feeling in a mess on the hill, and eventually I dragged my body to the trig pillar at the summit of Drum Ddu, and once five minutes of data were gathered from the highest ground at its base I became quite chatty and followed my two friends down the track to the awaiting car.

Gathering data at the summit of Drum Ddu

The inner realm of the Sennybridge Training Area is one to visit when conditions are good and the military are not there.  I would not recommend visiting when the weather is inclement and the thought of doing so when live-firing is taking place would be utterly foolhardy.  The whole of the Epynt deserves exploration and it is a shame that such upland beauty is now out of bounds for much of the year.


Survey Result:



Summit Height:  475.7m (converted to OSGM15, Trimble GeoXH 6000) (significant height revision)
 
Summit Grid Reference:  SN 96124 46428 (Trimble GeoXH 6000)

Bwlch Height:  277.9m (LIDAR)

Bwlch Grid Reference:  SN 84054 43300 (LIDAR)

Drop:  197.8 (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  41.58% (Trimble GeoXH 6000 summit and LIDAR bwlch)


 


Summit Height:  475.3m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SN 92746 43357 (Trimble GeoXH 6000)

Bwlch Height:  439.2m (LIDAR)

Bwlch Grid Reference:  SN 95188 45390 (LIDAR)

Drop:  36.1m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  7.59% (Trimble GeoXH 6000 summit and LIDAR bwlch)

  




Summit Height:  456.4m (converted to OSGM15)

Summit Grid Reference:  SN 95224 43297 (summit relocation)

Bwlch Height:  420.8m (converted to OSGM15)

Bwlch Grid Reference:  SN 95137 44068

Drop:  35.6m

Dominance:  7.81%

 



Twyn Rhyd Car

Summit Height:  453.5m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SN 96038 42263 (Trimble GeoXH 6000)

Bwlch Height:  419.0m (LIDAR)

Bwlch Grid Reference:  SN 95698 42538 (LIDAR)

Drop:  34.5m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  7.60% (Trimble GeoXH 6000 summit and LIDAR bwlch)



 

Drum Ddu

Summit Height:  473.9m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SN 97932 44744 (Trimble GeoXH 6000)

Bwlch Height:  438.2m (LIDAR)

Bwlch Grid Reference:  SN 96230 45879 (LIDAR)

Drop:  35.7m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  7.54% (Trimble GeoXH 6000 summit and LIDAR bwlch)