Showing posts with label Yr Allt. Show all posts
Showing posts with label Yr Allt. Show all posts

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

 

 

Tuesday, 15 November 2022

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

 

Yr Allt (SJ 139 039) – 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 derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Yr Allt (SJ 139 039)

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 Yr Allt, and it is adjoined to the Carnedd Wen group of hills, which are situated in the southern part of North Wales (Region A, Sub-Region A3), and it is positioned with minor roads to its north, west and east, and the B4390 road to its south, and has the village of Castell Caereinion towards the north-east.

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 24m of drop, based on the 333m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 309m bwlch height, based on interpolation of 5m contouring between 305m – 310m. 

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.

Therefore, the confirmation of the addition of this hill to Sub-Trichant status is due to LIDAR analysis, resulting in a 332.1m summit height and a 309.2m bwlch height, with these values giving this hill 23.0m of drop, which is sufficient for it to be classified as a Sub-Trichant. 

 

The full details for the hill are: 

Group:  Carnedd Wen 

Name:  Yr Allt 

OS 1:50,000 map:  136

Summit Height:  332.1m (LIDAR)                                                           

Summit Grid Reference:  SJ 13929 03993 (LIDAR) 

Bwlch Height:  309.2m (LIDAR) 

Bwlch Grid Reference:  SJ 13923 04057 (LIDAR) 

Drop:  23.0m (LIDAR) 

 

Myrddyn Phillips (November 2022)

 

 

 

 

 

Saturday, 20 March 2021

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

17.01.21  Yr Allt (SJ 242 100) 

Yr Allt (SJ 242 100)

With the forecast set fine for the day I sauntered out on the canal towpath for a socially distanced walk with friends who I met at 9.15am.  Our plan was to visit Yr Allt, which is one of my two go-to hills during lockdown.  This and Y Golfa can easily be visited from my front door and both give good varied walking, with Yr Allt having a number of options to and from its summit. 

Heading through the wood above the Flash Leisure Centre

Today we headed from the Flash Leisure Centre to the wood that overlooks it.  From here we accessed the field above Corfield’s Farm and then it was only a short walk avoiding winter mud across another field to the farm yard, where a footpath led to another wood. 

I hadn’t used this particular footpath before and once beyond the farmyard it led through a deciduous wood, then over a large field and down leaf cluttered slopes leading to a small book.  The path led over the brook and continued toward the Gungrog Fawr Lane.  I was now on land that I had investigated during the previous lockdowns and from here continuing public footpaths led all the way to the summit of Yr Allt. 

Gaining height with Welshpool in the valley below

It was good to be out with the girls, all were quicker than me, but I was more than happy to saunter at my own pace enjoying the ever expanding view.  Nic brought Tommy the dog who was flying across the fields investigating all manner of places and having the time of his life; oh to have the energy of a little dog! 

Nearing the summit of Yr Allt

By the time we reached the summit a slight chilled breeze blew across the hill, so we de-camped on the fallen bow of a tree in the dip between the high point and the trig pillar to have a rest and bite to eat. 

After visiting the trig pillar we wandered down the connecting south-westerly ridge where two gates gave access to the top of the Rhallt Lane, from here we sauntered down the lane to the canal towpath and then home.  It proved a great way to spend three hours.

 

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 sixth visit to the summit of Yr Allt 

 

For further details please consult the Trimble Survey Spreadsheet

 

Friday, 5 March 2021

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

07.01.21  Yr Allt (SJ 242 100, previously Trimbled) 

Yr Allt (SJ 242 100)

At 7.00am I was standing on my front door step with a large mug of tea in hand looking out on a scene of winter fog and chilled air.  Living in the Severn Valley fog and mist can dominate during winter months when their cold and obsessive feel can linger for many days on end.  However, fog can herald a magical day ahead when blue skies are above and early morning starts can give temperature inversions.  This morning though, I was happy enough to sip on my tea and head back inside to warmed radiators and more LIDAR work. 

Yr Allt from beside the Montgomereyshire Canal

Before the coloured contours of LIDAR took over I set about writing an article for UKHillwalking and Grough on the listing of HUWs.  Happy with my first draft I filed it away and set about creating more of those mesmerizing LIDAR contours.  An hour later with another hill LIDARed I noticed that bright winter sunshine was glaring through my office window.  I quickly checked the Met Office forecast for Welshpool and 30 minutes later I was walking on the canal tow path with map and camera in hand with the frosted profile of Yr Allt beckoning. 

Yr Allt and Moel y Golfa

The trees beside the canal were laden in delicate frost, the winter white standing out against a beauteous blue sky.  I’d visited Yr Allt on a number of occasions and it had become one of my two go-to hills during lock down.  I’m fortunate to live where I do and am extremely appreciative of the countryside on my doorstep.  I’d also started to investigate different routes on this hill and wanted to venture on to new ground on both its ascent and descent.  But today, whatever way I approached the hill, it looked stunning with its mixed woodland gleaming white in frost, which in the early afternoon was only accentuated by large parts of the pastoral fields close to its summit having succumbed to the morning sunshine and now free of frost and glowing green.  It was a wonderful sight.

It was a sheer pleasure to be out, and although I enjoy the creative process of posting on my Mapping Mountains site, it would not exist if not for the joy I find in the hills.  Each hill is always a new experience, however many times one visits. 

I soon gained height above the Flash Leisure Centre and entered a wood to gain access to the fields adjacent to Corfield’s Farm.  Fom here public footpaths would lead me up to opening views and the ever present profile of the whitened Yr Allt beckoning in the distance. 

Yr Allt from above Corfield's Farm

Before reaching the path leading to the hill’s upper slopes I headed over a field, which was between two public footpaths, the easiest route from here was through a gate that led to the upper Gungrog Fawr Lane, before arriving at the gate I heard the wisps of ‘are you lost then?’, it took me a while to see who had caught me slowly plodding over their field.  Once the glint from the winter sun allowed us to say hello I apologised and asked the best way to access the continuation of the footpath.  We chatted for a number of minutes before I thanked them for their help and off I sauntered further in to the magical land of frost. 

Frosted trees with Cefn Digoll in the background

From the direction of my approach the way to the upper part of Yr Allt is accessed from a delightful enclosed footpath which today had frosted trees gleaming in the sun.  It was all rather otherworldly with frost raining down each time I walked under a tree as the piercing sun slowly melted the whiteness.  Ahead was open hillside, which today was a contrast between pastoral green and bleak and beautiful frosted white.  With the trees resembling growing veins glinting in the air. 

Nearing the summit of Yr Allt

Whites, greens and winter greys

I was soon at the top and continued toward the lower summit beside the trig pillar.  By now a westerly cloud bank was quickly appearing pushing east toward the sunshine and the summit of Yr Allt.  I had time to capture a few images with the winter greys contrasting against the blue and white, before the bank of cloud obstructed the sun. 

Dots of white set against pastured greens and stunningly beautiful trees

The frost persisted, but with the magical colour now gone it left a subdued feel to the land, one that winter all too readily brings.  I used gates across a myriad of fields to reach the continuation of the Rhallt Lane, and then more public footpaths across more fields to reach the top of the Red Bank.  All I now had to do was call at Aldi on my way home for a quick shop.  By the time I loaded up with milk, mixed salad and some falafels, rain was now falling on the waters of the canal. 

Looking toward the lower trig pillared summit of Yr Allt

Winter weather can change all too easily, and today was no different, with Narnia like conditions earlier and greyed rain later.  I walked the remainder of the short distance home happy in the knowledge that those magical couple of frosted hours would replenish me for the next few days ahead. 

 

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 fifth visit to the summit of Yr Allt

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

 

For further details please consult the Trimble Survey Spreadsheet

 

 

 

Sunday, 21 February 2021

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

06.11.20  Yr Allt (SJ 242 100)  

Yr Allt (SJ 242 100)

In an evening I sometimes take a small walk following a part of the canal tow path which is no more than a few minutes from where I live.  The usual direction I walk frames Moel y Golfa toward the north-east, whilst to the east the elongated spine of Cefn Digoll dominates.  I find just a few minutes beside this waterway can re-invigorate and seldom leaves me unfulfilled. 

On occasion I extend my usual walk to gain a little height, by doing so the wooded summit of Upper Park comes in to view.  However, when height is gained and the confines of the canal tow path left, it is Yr Allt that dominates.  This hill is positioned to the immediate north-east of Welshpool and rises like a squashed cone with a strip of green grazed pasture framed against mixed woodland. 

My evening walk took me to the fields surrounding Corfield’s farm.  I’d been here many times during the previous months when lock down restrictions only permitted walks from your own home.  Usually in an evening I sit beside the canal and watch the cloud scape edge ever darker as dusk turns to night.  During this time the colours can mesmerize, they can be other worldly and seem beyond description.  However, on this particular evening I’d set out earlier as I wanted to chase that magical 30 minutes when the sun sinks low on the horizon and illuminated colour highlights the land.  I was now in a field beside the pool known as the Flash with Corfield’s Farm in front and the squashed cone of Yr Allt beyond.  That magical light was playing upon the land with illuminated autumnal colour picking out the most delicious hues. 

The Flash, Corfield's Farm and Yr Allt

I stood and looked up at Yr Allt, a hill I had been up on many occasions.  I had seldom seen it look so wonderful.  As that magical light faded I turned my back on the hill, happy in the knowledge that the following day I would be on its summit, and headed home as the slumber of dusk set in.         

 

Visiting Yr Allt: 

With a forecast of early morning mist clearing to sunshine and blue skies, the day was one not to be missed and I had arranged to meet Huw at 9.30am for a socially distanced walk to the summit of Yr Allt.  This hill dominates the immediate north-eastern outskirts of Welshpool, and although not great in height, it is relatively prominent and gives extended views. 

Over recent years I’d visited its summit twice to survey it with the Trimble GeoXH 6000 and did likewise on a separate occasion to survey its bwlch.  Therefore, the day ahead was one free of the Trimble. 

I left my home just before 9.20am to walk the short distance on a part of the Montgomeryshire Canal tow path to where we had arranged to meet.  All surrounding land was cloaked in autumnal mist, and with hardly a breath of breeze a gentle feel pervaded the landscape. 

It was good to see Huw, as although we had been in communication since the first nationwide lock down was implemented in late March; we had only seen one another once during the subsequent eight months, so there was a lot of catching up to do. 

We followed the continuation of the tow path out of town toward the second bridge which gives access to the Rhallt lane.  All was quiet and still with the morning’s mist hung across the waters of the canal.  The lane heads steeply up and soon bisects, with the right hand branch swinging northward and eventually turning to a track and then a footpath through scrub undergrowth.  Our route to the hill followed the right hand branch of the lane up until a public footpath sign indicated the continuation of our route.  I was now on new ground as I’d always descended from the summit in this direction, but to the east of this footpath. 

The footpath was a delight as it squeezed its way between private ground adjoined to a house on its north and a small wood on its south.  Underfoot, copious amounts of leaves scattered and crunched as we made progress firstly contouring and then gaining height to where a foot style gives access to an open field.  It was here we stopped as we had spotted flashes of blue overhead toward the upper part of the lane and now a break in the mist gave views across the river valley to the long backed ridge of Cefn Digoll which floated above the mist to our south-east. 

Huw admiring the view

As we stood in the field admiring the view a pair of Red Kites skimmed the skies overhead, their delicate grey heads and rusted body picked out by direct sunlight.  One then nestled in a large tree directly in front of us.  We edged nearer as it manoeuvred on the branch, I had my camera at the ready and took a series of photos as we forever got closer, until it left the branch and glided off toward the Allt Wood, whose perimeter, from this point onward would be our route to follow to the top. 

Red Kite

As we progressed ever upward the mist floated past us giving beautiful conditions.  Reaching the summit of the hill a tear in the mist showed more blue sky above and the high mast just beyond reared skyward.  Leaving the summit we continued following the edge of the Allt Wood loosing height to a foot style and then steeply up toward the trig pillar where we met Geraint, who had walked up the Coppice Lane. 

A misted scene approaching the summit of Yr Allt

It was great to see him, another old friend that during the lock down and months afterward I had not seen.  We remained beside the trig pillar for some time, chatting and laughing and looking out as the conditions Huw and I had experienced on our way up where the mist had cleared, was now also in evidence here. 

Beside the trig pillar on Yr Allt

By the time we left the trig it was stunning with autumnal warmth and clear blue skies above.  Instead of reversing our inward route we decided to walk with Geraint toward Coppice East Farm.  To spend time in a friend’s company during such times was a thing to savour and our route down followed a muddied wooded track past the most delightful autumnal colour highlighted by that magical overhead sun. 

Heading down the muddied track to the Coppice Lane

As we said our goodbye’s to Geraint who headed down the continuation of the Coppice Lane, Huw and I lingered resting on the upper bar of a gate, talking about a plethora of subjects as we had done leading up the hill and as we did so all the way back toward our inward route. 

The greens of autumn

A series of footpaths lead from Coppice East Farm across fields and down through a wood to the Montgomeryshire Canal, on our way down the Breiddin dominated the view to our north-east with their distinct profile on grand display. 

Heading back toward the canal tow path with the Breiddin in the background

Once beside the canal a swing bridge gave access over it to the towpath and we followed this back toward Welshpool, chatting away and then sitting on a bench beside the second swing bridge we came to.  It was here that a number of people stopped to talk, all knew Huw, and we lingered here in the sunshine for 30 minutes or so, watching at one point a number of sheep herded from The Moors farm across the swing bridge to the grazing fields on the opposite side. 

Moving the sheep from Moors Farm

Continuing on the tow path we chatted away, I stopped occasionally to look back at Yr Allt, now no more than a rising field off in the distance.  Yr Allt is a fine hill, and today we’d visited it in sublime conditions. 

Yr Allt from the tow path

Once back home I mapped out the route at six miles, it had taken almost six hours and was all-the better for the relaxed, leisurely pace set throughout the walk.  The conditions were quite magical with gloomed mist replaced by autumnal sunshine and welcome warmth that will all too soon disappear with the oncoming and imminent winter, and all done in excellent company. 

 

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 fourth visit to the summit of Yr Allt

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

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

 

 

For further details please consult the Trimble Survey Spreadsheet