Showing posts with label Surveys: 22 Carnedd Wen. Show all posts
Showing posts with label Surveys: 22 Carnedd Wen. Show all posts

Sunday, 18 January 2026

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

20.11.25  Gaer Fawr (SJ 223 129, previously Trimbled)

Gaer Fawr (SN 223 129)

Gaer Fawr stands as a large mound of a wooded hill on the periphery of Guilsfield.  The trees hide its true significance as one of Wales’ great ancient hill forts.  When occupied it had up to five lines of ramparts, with some 8m in height.

The wood surrounding the hill is now managed by the Woodland Trust and today’s visit was with my cousin Lynn.  Since our last visit in May 2021, Lynn had donated a large sum to the Woodland Trust from a trust fund set up in memory of her late husband; Dave.  Part of the donation went toward installing a bench overlooking the eastern aspect of the hill toward Cefn Digoll off in the distance.  Therefore, as well as enjoying Lynn’s company whilst taking in a small walk, she wanted to show me the bench set up in Dave’s memory.

Having left my car in the parking area beside a small quarry we headed back down the narrow lane that leads toward the south-westerly lower part of the hill.  The weather was set fine, albeit with a chilled easterly breeze.  However, during our walk we were sheltered from this in the wood.

There are a number of paths through the wood, all seem to connect with ones leading to the summit which I’d previously Trimbled.  Our route for the day led back down the narrow road to a gate giving access to the lower eastern part of the wood. 

Lynn on the path heading through the wood

It was good to be out with Lynn again, a person whose company I’ve enjoyed on small walks over recent years.  The path circled the easterly part of the wood, gaining height as it did so, before swinging up in to the canopy of trees that shone dappled light whenever the sun broke through intermittent cloud. 

The bench set up with one of Lynn's donations to the Woodland Trust

Our route led us straight to the bench.  It was an ideal place to stop and rest.  From this position a gap in the trees looked out toward the east.  Just behind us another path led up to connect with one of the main routes to the summit.  The bench had been placed in a quiet spot, one for rest and contemplation.  A small plaque on it had an inscription from one of Lynn’s favourite poems which she read for me; Fern Hill by Dylan Thomas, ‘and once below a time I lordly had the trees and leaves’.  I took a few photos before we left to head up the path toward the summit. 

The plaque in memory of Lynn's late husband

Although the summit area is open there is no extensive view due to surrounding trees.  However, it is a beautiful place to visit and especially so in May when blue bells adorn the ground. 

The summit of Gaer Fawr (SJ 223 129)

We both wandered, me enjoying the dappled low light casting deep shadow and emerald colour through the trees and Lynn looking out through the trees to the lands beyond.  We left heading down to visit the large terracotta wild boar that commemorates the bronze boar helmet found at this site that is positioned near the top of the ancient north-east entrance. 

The terracotta boar

Leaving the wild boar we took the path down, opting for the longer route that contours the lower part of the wood leading back to the small quarry and the awaiting car.  By the time we arrived the temperature had chilled with late afternoon heralding another cold frost encrusted night. 

    

Survey Result: 

 

Gaer Fawr (significant name change)

Summit Height:  217.6m (converted to OSGM15, from previous Trimble GeoXH 6000 survey) 

Summit Grid Reference:  SJ 22394 12995 (from previous Trimble GeoXH 6000 survey) 

Bwlch Height:  138.7m (LIDAR)

Bwlch Grid Reference:  SJ 21991 13145 (LIDAR)

Drop:  78.9m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  36.26% (Trimble GeoXH 6000 summit and LIDAR bwlch)

 

 

For details on the 1st survey of Gaer Fawr

For details on the 2nd survey of Gaer Fawr

For details on the 3rd visit to Gaer Fawr

 

 

For further details please consult the Trimble Survey Spreadsheet

Monday, 23 June 2025

Mapping Mountains – Trimble Surveys – Carnedd Wen


30.04.25  Castell Dolforwyn (SO 151 950) 

Castell Dolforwyn (SO 151 950)

With the weather set fine, my cousin Lynn, wanted to visit Castell Dolforwyn.  We’d spoken about the castle on a number of occasions over recent years, but up until now had not fixed a date to visit.  It was going to be a family outing as we had mentioned this to another cousin; Thelma, and she also wanted to visit.

It proved an extremely warm day and especially so during the afternoon.  We set off walking at 2.00pm from the small car park directly east of the summit.  It’s only a short walk from here to the remains of the castle, but today with the heat of the afternoon it was going to be a slow plod to the top. 

Information board giving detail of the castle's construction

Llywelyn ap Gruffydd built the castle in 1273 on the Welsh side of the Afon Hafren (River Severn), with Montgomery castle a few miles away on the English side of the river, with this being part of the lordships associated with the English crown.

Its occupation by Llywelyn was short lived, as defiance toward the English crown resulted in a siege, with its surrender in 1277.  Afterward it was occupied and reinforced by Marcher Lord Roger Mortimer, before falling in to disrepair and abandonment in the 14th century.  Today it stands on a quiet Welsh hill top looking out toward border country. 

Information board giving detail of the later renervation

On my previous visit I had Trimbled the summit, therefore today was purely set aside for an afternoon with my cousins, with good conversation and lots of laughs.  A steep track leads from the car park toward a gate and an earthen track beyond, thankfully the majority of which was in shade.  The dappled light and increasing warmth gave a Mediterranean feel to the whole walk. 

The path leading to the old entrance gate

Reaching the outer perimeter of the castle a grassed bank leads through what was once the gateway entrance, to the remaining walls and enclosed rooms within.  Today we had the castle to ourselves for the majority of our visit, with the only other visitors being a mother and her two young children, who were on holiday from Belgium exploring Wales for the week in a large camper van.  They had visited the Gower, Pembrokeshire, Anglesey, Yr Wyddfa and were heading down to Brecon before flying home from Bristol tomorrow morning.  They had certainly picked a glorious week to visit. 

Thelma beside the wall

Having roamed the interior of the castle we did a loop of the exterior walls before heading back inside the castle remains, where we found a suitable place to sit and relax in shade away from what was proving a quite ferocious sun.  We remained here for about 20 minutes, cooling down and chatting. 

Lynn admiring the view

All that remained was a steady walk back down our inward route to the awaiting car, where I changed from walking boots to sandals before driving the short distance back to Welshpool. 

 

Survey Result:

 

Castell Dolforwyn (significant name change)  

Summit Height:  228.5m (converted to OSGM15, previous Trimble GeoXH 6000 survey) (significant height revision)

Summit Grid Reference:  SO 15189 95016 (previous Trimble GeoXH 6000 survey)

Bwlch Height:  188.1m (LIDAR)

Bwlch Grid Reference:  SO 14988 95278 (LIDAR)

Drop:  40.4m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  17.68% (Trimble GeoXH 6000 summit and LIDAR bwlch)

                                       

 

For details on the summit survey of Castell Dolforwyn

For further details please consult the Trimble Survey Spreadsheet 

Tuesday, 10 October 2023

Mapping Mountains – Trimble Surveys – Carnedd Wen


06.09.23  Castell Dolforwyn (SO 151 950) 

Castell Dolforwyn (SO 151 950)

Castell Dolforwyn sits atop a hill that from the near main road is shrouded by trees.  I had only visited once before; in February 2004 when combining this hill with a number of other P30s to its north-west.  Other than prior knowledge of its position and/or the small signpost pointing toward it from the road to its east, it would be all too easy not to know that one of Wales’ most important ancient castles is positioned near-by. 

Text from the information board at the small car park

The castle was built in 1273 by Llywelyn ap Gruffydd on the Welsh side of the Afon Hafren (River Severn), with the castle at Montgomery only a few miles away on the English side of the river and very much a part of the lordships associated with the English crown.

The information board beside the narrow lane leading to the small car park

Its occupation by Llywelyn was short lived as defiance toward the English crown resulted in a siege and following surrender of the castle in 1277.  It was then occupied and reinforced by Marcher Lord Roger Mortimer, before falling in to disrepair and abandonment in the 14th century.  Today its remains are evocative, standing as one of the last vestiges of Welsh Princedom in this part of the country. 

A brief history of the castle

With business to attend to in Newtown and the prospect of a forested top to visit this upcoming Saturday, and the forecast for warm conditions I thought a small walk to a single hill on my way home to Welshpool was in order, and Castell Dolforwyn ticked all boxes.

I pulled up at the small parking area to the east of the summit and was walking by 10.15am.  The path from this direction leads through a gate and then steeply up a track with embedded stone giving grip for vehicle access to Yewtree Cottage, which could be seen clinging to the hillside from the car park below. 

One of many butterflies flitting about in the morning's sun

The hedgerows were awash in greenery with a myriad of butterflies flitting about in the morning sun.  The track veered leftward and then gradually gained height until beside the cottage, from here a gate accesses the upper track which eventually leads to the remains of the castle. 

The track leading to the castle

The sky was ablaze with blue as I approached the stone work of the exterior walls, it was already warm and I was glad that the uphill was now over with.  Prior to the visit I had used LIDAR to determine the height and position of the summit and its connecting bwlch and had come prepared with the relevant ten figure grid references.

LIDAR gives two high points 1.1cm apart in height.  The first one that I approached looked higher.  However, it is reported that the upper hill was levelled to accommodate the building of the castle, so any semblance of a natural high point is only what remains today.  Before positioning the Trimble to gather its first data set I wandered parts of the castle and looked back toward the spot the Trimble was now placed upon, and it was soon set to gather its allotted data. 

Gathering data at the summit of Castell Dolforwyn

This high point matched the LIDAR co-ordinates for the summit.  As the Trimble quietly beeped away gathering its all-important summit data I sat on one of the stone walls and waited for the five minutes of data to be stored.

Once data were gathered and stored I closed the equipment down and immediately activated it again as I headed toward the second LIDAR top, this proved to be on a gravelled section at the north-easterly part of the castle, I quickly dismissed this as unnatural and backtracked to a slight grassy rise between the two points. 

LIDAR summit image of Castell Dolforwyn

This second position is given lower by LIDAR, but now here I wanted a comparison of Trimble data with the gravelled section dismissed as a recent man-made construct.  During data collection the castle surrounds remained quiet, with only the occasional sound of a bird and the tree scampering of a squirrel. 

Gathering data at the second point surveyed with the Trimble GeoXH 6000

Once the equipment was packed away I wandered around the castle, reading the various information boards as I did so.  Leaving the inner castle I then walked the perimeter of the exterior walls at their immediate base.  This gave a good and different perspective to the castle and I would recommend doing this to any visitor. 

Part of the exterior wall

An information board in the interior of the castle

The south-west corner of the castle

By the time I left and headed back down the rack it was getting increasing warmer, but I was in no rush and the going was easy.  Back at my car I talked with a Dutch couple who were touring Wales for the week.  We chatted for ten minutes or more before they set off up the steep track toward the castle; I recommended taking lots of water as it was now decidedly hot.  

 

Survey Result:

 

Castell Dolforwyn (significant name change)

Summit Height:  228.5m (Trimble GeoXH 6000) (significant height revision)

Summit Grid Reference:  SO 15189 95016 (Trimble GeoXH 6000)

Bwlch Height:  188.1m (LIDAR)

Bwlch Grid Reference:  SO 14988 95278 (LIDAR)

Drop:  40.4m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  17.68% (Trimble GeoXH 6000 summit and LIDAR bwlch)

                                       


For details on the 2nd visit to Castell Dolforwyn


For further details please consult the Trimble Survey Spreadsheet

 

 

  

Saturday, 9 September 2023

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

13.07.23  Yr Allt (SJ 242 100, previously Trimbled) 

Yr Allt (SJ 242 100)

It was my pleasure today to join Sarah Kerr on part of her Offa’s Dyke walk.  Sarah had contacted me a few weeks ago and asked if I would like to join her for a few hours as she was walking part of the long distance footpath north of Welshpool.

Considering how wet recent days have been we were ever so fortunate with the weather as although an occasional slow moving shower was forecast for parts of Wales, any grey cloud that materialised did not develop in to rain and our walk remained dry. 

Sarah Kerr

I met Sarah at 8.30am on the Rhallt Lane outside the recently built and large property where she overnighted.  The morning was beautiful with blue sky and the hint of warmth in the air.  It was good to see her as the last time our paths crossed were a number of years ago when trips to Welsh islands and lighthouses were organised.

Prior to meeting I suggested the possibility of including an ascent of Yr Allt from the Rhallt Lane and dropping off the hill back on to the canal towpath which hereabouts also forms a part of Offa’s Dyke footpath.  Sarah was on for this, therefore after pleasantries we walked up the steep lane chatting about all manner of things.  The conversation must have been good as even though I’d been this way a number of times over recent years we overshot the footpath I planned for us to follow.  This meant we remained on the lane as it turned in to a track and we followed it to its high point. 

In the field leading toward the trig pillar

At the end of the track a footpath continues through undergrowth to connect with a forest track, however we now headed to our right on to a steepening field where wild flowers predominated, with a plethora of butterflies flitting this way and that in the warmth of the strengthening sun. 

Approaching the trig pillar

This part of the field forms a ridge that leads ever upward to where the triangulation pillar sits confidently looking north-eastward out toward the Breiddin and the higher hills to the west.  The western horizon was dominated by the Y Berwyn ridge with the higher Aran also on show, with their elongated ridge still battling with wisps of cloud which no doubt would soon be burnt off. 

The distant Y Berwyn

Leaving the trig pillar we lost height heading toward the corner of the lower field, where a stile gives access to another field leading past the large mast that can be seen from many miles away signifying the summit area of this hill.  Shortly beyond is the high point, it doesn’t afford the view that the ground beside the trig pillar does, but it is the summit and therefore with my bagging hat on it had to be visited. 

Sarah at the summit of Yr Allt

To get on to our descent route we now doubled back to the trig pillar and followed the ridge downward past pheasant pens and the Gamekeepers Cottage at the end of the forest track.  Down we went heading toward the Coppice Cottage where many a year ago I used to live.  However, before the cottage is a forest track on the right that heads down through the wood.  I had always wanted to investigate this track and see where it leads.  Having already mentioned this to Sarah she had no objection to us investigating this route.

The track led us down through the wood and seemed to grind to a halt where summer undergrowth of nettles and brambles then took over.  Just below us was a high pheasant fence which conveniently for us had been flattened due to a tree bow falling on it.  However, between us and it was all manner of debris which entailed an assault course to get through, which we eventually did, emerging on to an open field and with the aid of mapping on Sarah’s mobile phone we were soon directed down the field to a footbridge crossing the canal.

After crossing the footbridge we had one barb wired fence to negotiate before reclaiming the canal towpath.  Our onward routes now headed in opposite directions, Sarah farther northward following the footpath of Offa’s Dyke and southward for me back toward Welshpool. 

Sarah heading off on the canal towpath to continue her Offa's Dyke journey 

Before heading our separate ways we had a hug and I thanked Sarah for the invite to join her.  It had been an immensely enjoyable few hours with good company, good conversation and a hill thrown in for good measure!


Survey Result: 

 

Yr Allt

Summit Height:  231.3m (converted to OSGM15, from previous Trimble GeoXH 6000 survey)

Summit Grid Reference:  SJ 24240 10005 (from previous Trimble GeoXH 6000 survey)

Bwlch Height:  125.9m (LIDAR)

Bwlch Grid Reference:  SJ 21855 08773 (LIDAR)

Drop:  105.4m (Trimble GeoXH 6000 summit and LIDAR bwlch) 

Dominance:  45.57% (Trimble GeoXH 6000 summit and LIDAR bwlch)

 

 

For details on the first Trimble GeoXH 6000 summit survey of Yr Allt

For details on the second Trimble GeoXH 6000 summit survey of Yr Allt

For details on the Trimble GeoXH 6000 bwlch survey of Yr Allt

For details on a third visit to the summit of Yr Allt

For details on a fourth visit to the summit of Yr Allt

For details on a fifth visit to the summit of Yr Allt

 

 

For further details please consult the Trimble Survey Spreadsheet

 

 

Sunday, 11 September 2022

Mapping Mountains – Trimble Surveys – Carnedd Wen


16.07.22  Carreg y Frân (SH 938 053) and Panylau Gwynion (SH 935 063) 

Panylau Gwynion (SH 935 063)

Having suggested to meet up for a weekend walk, Aled devised a route taking in two Pedwar hills and with a relatively early start this would enable me to get back to Welshpool for my 12.40pm lunchtime appointment.

The two hills he suggested were ideal; Carreg y Frân and Panylau Gwynion.  I had neglected these hills for many years as Ordnance Survey maps show each summit immersed in conifers, however recent logs on the Hill Bagging website report that the conifers on each summit have now been felled.

The walk taking in these two hills was relatively short in length following the course of a track.  Therefore navigation was easy and although the forecast was for increasingly warm conditions, an early start should still enable me to make my lunchtime appointment.

We met in the car park in Llanerfyl at just before 7.00am.  I then drove up the quiet valley of Cwm Nant yr Eira which stretches for miles toward Talerddig.  Today the valley was showing signs of mid-summer with newly mown fields of hay and that quiet heat induced stillness where a dulled green predominates.

Nearing the high point of the narrow paved road that follows the course of the valley the track leading to these two hills veered rightward gaining height over a ridge that peered down at us as I pulled my car up.  It was here that I parked.  We had debated driving up the track which would certainly save time.  Although we opted to walk up this track, it would be relatively easy to have driven with a number of parking options leading to the first hill and some also afterward. 

The Cwm Nant yr Eira heading toward Talerddig

It was 7.20am as we started walking.  The conditions were idyllic as the heat of the day had not yet set in and that slight cooling of early morning was still evident as we gained height up the track.  Soon the view opened up with the three hills of Ffridd Bryn Mawr (SH 981 065), Pen Coed (SH 985 090) and Moel Ddolwen (SH 988 078) no more than light grey silhouettes from this direction with the sun still low in the sky.  I had visited these hills in July 2020 when the heat battered me, but remember them giving an excellent circuit. 

Moel Ddolwen on the left and Ffridd Bryn Mawr

In the distance mist clung to the depths of the Caersŵs to Cemmaes Road valley, waiting for the heat to eventually burn it off.  The early morning start had given striking colour to the land when looking westward, but the knowledge that the heat was ever increasing was still present at this time of the morning; we pressed on. 

Heading up the track toward Carreg y Frân

Steady progress was made toward the upper part of Carreg y Frân and when on the track immediately below its south-western flank we could see that new conifers had been planted, thankfully they were still saplings, but in future years will again swamp this hill.  A disused quarry sits beside the track and it was from here that we headed up in to the fledgling trees.  The going underfoot was never difficult, although muddied peat laden holes were evident. 

The edge of the disused quarry

Soon we were at the summit, although the very highest point of the hill is difficult to pinpoint due to the profusion of channels created for the trees, these were interspersed with a multitude of small bumps now overgrown with a profusion of undergrowth.  Having visited a few contenders, Aled directed me toward what looked the highest part of the hill and the Trimble was soon set up gathering summit data. 

Gathering data at the summit of Carreg y Frân

During data collection Aled spotted movement below where the sapling trees met mature conifers; a deer had bolted.  Deer are a rare sight on the Welsh hills, with many spotted close to or in forestry.  This one had antlers and was probably a Fallow Deer.  We watched it as it made quick progress over the tree debris, I had just enough time for a photograph and then it was out of sight. 

Spot the Deer

It was now time to rest and soak in the scene and therefore I let the equipment gather 10 minutes of data.  Once data were gathered and the equipment packed away, I followed Aled through the small conifers back toward our inward track. 

Panylau Gwynion from Carreg y Frân

The track now continued downward passing the connecting bwlch between the two hills.  It looked a forbidding place to attempt a survey and with the prospect of future LIDAR coverage I had no intention of trying to do so today. 

Somewhere over there is the bwlch of Carreg y Frân

Beyond the bwlch the track swung round the upper easterly flank of Panylau Gwynion.  The conifers on the upper part of this hill have also been felled, but the resulting debris of dead wood and branches still scatter its upper section, in contrast to the summit area of Carreg y Frân with young conifers already taking root.

On my suggestion we continued on the track heading toward the upper northerly part of the hill and only headed up toward its summit at another disused quarry, where a rutted vehicle track gauged its way upward.  By this stage I was slowly following Aled, with my head down concentrating on underfoot conditions.

The Hill Bagging website mentions two contenders for the high point of this hill.  The first where a tiny 450m map ring contour is positioned just to the west of the fence boundary between what was the conifer plantation and open ground.  This first point consists of a tussocky heathered knoll.  The second is where a larger 450m map ring contour is placed amongst what was the conifer plantation; this has a 451m spot height on contemporary Ordnance Survey maps.  Both positions could now be Trimbled.

Aled at the summit of Panylau Gwynion

By the time I emerged on the upper part of the hill Aled was standing on top of the tussocky knoll.  I soon joined him and sat below the equipment so as not to disturb satellite reception as the Trimble gathered its all-important data. 

Gathering data at the summit of Panylau Gwynion

One data set remained to collect and its position was only 30 metres away, so after taking a few photographs of the Trimble set-up position on the tussocky knoll, I packed it away and again followed Aled in to the debris of dead wood toward the high point of what was the forested section of this hill.  Having chosen our preferred position Aled stuck a branch in to the debris of wood at the base of my rucksack which had the Trimble positioned on top, once the branch struck solid ground I then took a measurement offset between it and the Trimble’s internal antenna.  I then set the equipment to gather data. 

Gathering data at the lower of the two points surveyed for the summit of Panylau Gwynion

Once allotted data were gathered and stored we took a direct route down the upper part of the hill to reconnect with the forestry track.  This proved much easier than our inward route and soon we were heading down the track to the connecting bwlch between the two hills and then up toward the first of the two disused quarries, just beyond which I stopped for a few minutes rest. 

Looking back on the track as it passes the newly planted trees on Carreg y Frân

The continuation of the walk, although now decidedly warm, was a pleasure partly as I now knew I had sufficient time to get home, change, wash, sort my gear and make my lunchtime appointment, but it was also a pleasure to be out in this land; which is another small part of Wales that must be seldom visited except for the local farmer, a rogue hill walker and forestry workers.

We arrived back at the car at 11.00am and I was home just before midday and at my lunchtime appointment three minutes before our scheduled meeting time of 12.40pm.  An excellent way to spend the morning!

 

Survey Result:

 

Carreg y Frân

Summit Height:  436.1m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 93822 05394 (Trimble GeoXH 6000)

Bwlch Height:  c 397 (interpolation)

Bwlch Grid Reference:  SH 93337 05504 (interpolation)

Drop:  c 39m (Trimble GeoXH 6000 summit and interpolated bwlch)

Dominance:  8.96% (Trimble GeoXH 6000 summit and interpolated bwlch)

 

 

Panylau Gwynion

Summit Height:  450.3m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 93557 06357 (Trimble GeoXH 6000) (summit relocation)

Bwlch Height:  412m (spot height)

Bwlch Grid Reference:  SH 93627 06715 (spot height)

Drop:  38m (Trimble GeoXH 6000 summit and spot height bwlch)

Dominance:  8.51% (Trimble GeoXH 6000 summit and spot height bwlch)

 

 

For further details please consult the Trimble Survey Spreadsheet