Showing posts with label Mynydd Coch. Show all posts
Showing posts with label Mynydd Coch. Show all posts

Saturday, 8 October 2016

Mapping Mountains – Hill Reclassifications – Y Trechol – The Dominant Hills of Wales


Mynydd Coch (SH 804 099) - Lesser Dominant deletion

There has been a deletion from the listing of the Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from a Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips and assisted by Graham Jackson and LIDAR bwlch analysis conducted by Myrddyn Phillips.

Mynydd Coch (SH 804 099)

The criteria for the list that this deletion applies to are:

Y Trechol - The Dominant Hills of Wales - Welsh P30 hills whose prominence  equal or exceed half that of their absolute height.  With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height.  The list is authored by Myrddyn Phillips with the Introduction to the start of the Mapping Mountains publication of this list appearing on the 3rd December 2015, and the list is now available in its entirety on Mapping Mountains in Google Doc format. 

Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Mynydd Coch, and it is adjoined to the Aran Fawddwy group of hills, which are situated in the south-western part of North Wales (Region C1, Sub-Region C1B), and it is positioned with a minor road to its north, the A487 road to its west and the A470 to its east, and has the small community of Aberllefenni towards the west.

After the original 400m height band of Welsh P30 hills published on Geoff Crowder’s v-g.me website were standardised and interpolated heights and drop values also included, this hill was listed with 157m of drop, based on the 469m summit spot height adjoined to a triangulation pillar that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and the 312m bwlch spot height that appears on the Ordnance Survey 1:25,000 Explorer map, with these values giving this hill 33.48% dominance and its inclusion as a Lesser Dominant hill.

Extract from the Ordnance Survey 1:25,000 Explorer map

The summit of this hill was subsequently surveyed with the Trimble GeoXH 6000, resulting in a 468.3m height and when coupled with the 312m bwlch spot height these values gave this hill 156m of drop and 33.31% dominance, and therefore it was deleted from Lesser Dominant status.

The Trimble GeoXH 6000 gathering data at the summit of Mynydd Coch (SH 804 099)

However, it was not until the latest 1m LIDAR became available that the bwlch 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 bwlch image of Mynydd Coch

Therefore, the confirmation of the deletion of this hill from Lesser Dominant status is due to LIDAR bwlch analysis coupled with the summit height derived from the Trimble GeoXH 6000 survey, resulting in a 468.3m summit height and a 313.0m bwlch height, with these values giving this hill 155.3m of drop and 33.15% dominance, which is insufficient for Lesser Dominant status.


The full details for the hill are:

Group:  Aran Fawddwy

Name:  Mynydd Coch

Previously Listed Name:  Mynydd Cwmcelli 

OS 1:50,000 map:  124, 125

Summit Height:  468.3m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 80458 09952 (Trimble GeoXH 6000) 
 
Bwlch Height:  313.0m (LIDAR)

Bwlch Grid Reference:  SH 81012 10795 (LIDAR)

Drop:  155.3m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  33.15% (Trimble GeoXH 6000 summit and LIDAR bwlch)


Myrddyn Phillips (October 2016)



Wednesday, 3 August 2016

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


Mynydd Coch (SH 804 099)

There has been a Significant Name Change to a hill listed in the Y Pedwarau – The 400m Hills of Wales, with the summit height, bwlch height and their locations, the drop and status of the hill derived from a Trimble GeoXH 6000 summit survey conducted by Myrddyn Phillips and assisted by Graham Jackson and LIDAR bwlch analysis conducted by Myrddyn Phillips.

Mynydd Coch (SH 804 099)

The criteria for the list that this name change affects are:

Y Pedwarau – The 400m Hills of Wales.  Welsh hills at or above 400m and below 500m in height that have 30m minimum drop, accompanying the main list are five categories of sub hills; 500m Sub-Pedwarau, 500m Double Sub-Pedwarau, 400m Sub-Pedwarau, 390m Sub-Pedwarau and the 390m Double Sub-Pedwarau.  The list is co-authored by Myrddyn Phillips and Aled Williams and is published on Mapping Mountains in Google Doc format.

Y Pedwarau - The 400m Hills of Wales by Myrddyn Phillips and Aled Williams

The hill is adjoined to the Aran Fawddwy group of hills, which are situated in the south-western part of North Wales (Region C1, Sub-Region C1B), and it is positioned with a minor road to its north, the A487 road to its west and the A470 to its east, and has the small community of Aberllefenni towards the west.

The hill appeared in the original Welsh 400m P30 list compiled by Myrddyn Phillips and published on Geoff Crowder’s v-g.me website, under the transposed name of Mynydd Cwmcelli, which is a prominent name that appears approximately 1km west north-westward of the summit of this hill on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and is consistently placed on Ordnance Survey maps applicable to a 408m map heighted hill whose summit is positioned at SH 795 101.


Mynydd Cwmcelli469mSH804099124/12523/215Marilyn. Clem/Yeaman. Trig pillar. aka Craig-goch.
 

During the original compilation of this list Myrddyn Phillips used the map name that appeared closest to the summit of the listed hill or which seemed most appropriate for the hill, without due consideration for its positional value, doing so can perpetuate the use of inappropriate names.  As the 408m map heighted hill seemed of little consequence and was not then listed the use of its name for another hill did not seem inappropriate.  This is not a practice that he now advocates as with research either conducted locally or historically a more appropriate name for the hill can usually be found.

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.  Two of the historic maps now available online are the Ordnance Survey Draft Surveyors map which formed the basis for the first publicly available Ordnance Survey One-Inch ‘Old Series’ map, and it is the former map that has prompted the change in the listed name of this hill. 

The Draft Surveyors maps consist of the preliminary drawings made by the Ordnance Survey surveyors between the 1780s and 1840 and formed the basis for the first publicly available One-Inch map.  They were drawn at scales of six inches to the mile for areas considered of particular military significance and down to two inches to the mile for other areas.  Fair copies were then produced from these preliminary drawings to one inch to the mile and then copper plates were prepared for printing.  The Draft Surveyors maps for the whole of Wales are now available online and they form an important part in the study of Welsh upland place-names as they bridge the time frame between the late 18th century and the mid-19th century when the Ordnance Survey produced their first One-Inch maps, and importantly for this hill and its listed name, it is this map that places the name of Mynydd Coch adjacent to the summit of this hill.

Extract from the Ordnance Survey Draft Surveyors map

This list is now co-authored by Myrddyn Phillips and Aled Williams and when the 1st edition of the list was published by Europeaklist in May 2013, the listed name of this hill was changed to Mynydd Coch.

Therefore, the name this hill is now listed by in the Y Pedwarau – The 400m Hills of Wales is Mynydd Coch, and this was derived from the Ordnance Survey Draft Surveyors map.



The full details for the hill are:

Group:  Aran Fawddwy

Name:  Mynydd Coch

Previously Listed Name:  Mynydd Cwmcelli 

OS 1:50,000 map:  124, 125

Summit Height:  468.3m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 80458 09952 (Trimble GeoXH 6000) 
 
Bwlch Height:  313.0m (LIDAR)

Bwlch Grid Reference:  SH 81012 10795 (LIDAR)

Drop:  155.3m (Trimble GeoXH 6000 summit and LIDAR bwlch)


Myrddyn Phillips and Aled Williams (August 2016)



Sunday, 17 May 2015

Mapping Mountains – Trimble Surveys – Aran Fawddwy



13.05.15  Fedw Lwyd (SH 804 093), Mynydd Coch (SH 804 099) and Mynydd Tri Arglwydd (SH 812 093) 

Fedw Lwyd (SH 804 093)

As we sorted the last of our gear out and laced up our boots the predicted blue skies and warmth had not pervaded this part of Wales just yet.  Before setting off I wondered about putting on my thin one skin summer walking jacket as there was still an early morning chill in the air.  However, Graham wasn’t in doubt and was decked out in Paramo jacket and gaiters, the latter would certainly come in handy for our planned last summit of the day, as we were heading up toward hills above the small community of Aberllefenni and our last planned hill was Moel Heulen, which according to all maps and first-hand accounts of its ascent; is embedded in a thick conifer plantation.

We parked on a large slated area at SH 776 100 and walked down to join a delightful path that led to a footbridge which crossed the Afon Dulas, this river passes through Aberllefenni as it spills over rocks, forming inviting summer pools before continuing down to its joining with the Afon Dyfi and the merging with the sea.

Crossing the Afon Dulas

Our ascent led through a beautiful deciduous wood on a good narrow path that gained height above the infant river as the grey sky tried turning to white and blue.  As we broke out of the wood onto fields and soon to be hillsides the view to our west opened out and gave us the first view of Cadair Idris.  It would only be from higher on these hills that the view of its elongated ridge taking in Mynydd Moel and Gau Graig would be on show, but its presence dominated the western horizon as it grew above the forested tops leading away from our current position.

Through the wood

Emerging out of the wood and Cadair Idris started to dominate the view to the west

Beyond the wood we joined a green track that merged to become one of rock and gravel, as this gained height it passed the remains of Esgair-neiriau, which is now a forgotten farm house, which in its time was quite substantial.  Its southern façade is still intact, although dilapidated, but from the north its roof is missing and its innards are open to the elements.  It sits tranquilly next to a pool that doesn’t appear on older maps, rather forlornly it stands, a testament to times gone by when this place was lived in and no doubt gave a family a home and shelter from these hills.

Mynydd Coch above Cwm Celli

Inside its main room still stands its robust fire place with its timbered ceiling now fallen and open.  I gazed at its outer shell for a number of minutes, partly to regain my breath from our ascent through the wood, but also to look and try and take in its surroundings whilst wondering who it was that lived here and how did they lead their lives.

The old farm house of Esgair-neiriau

As we gained height above the old farm house of Esgair-neiriau the green grazing fields slowly turned to heath and moor and the views across Cwm Celli on our left were to the high point of our day; Mynydd Coch, which stood with its trig pillar above the surrounding conifers as they marched regimentally up its hillsides.

The view of Cadair Idris from the approach to Fedw Lwyd

Our first hill to survey is listed as a Sub-Pedwar, its name if Fedw Lwyd.  It was once listed as a Tump and given c 31m of drop but was deleted from this list when the Ordnance Survey enlarged Geograph map was found to have a 399m spot height at the bwlch, giving the hill only 25m of drop.

When we reached its summit Graham set about Abneying between two points to find the highest, once completed, the Trimble was placed on the ground and gathered its customary five minutes of data.

Gathering data at the summit of Fedw Lwyd

As the Trimble gathered data I looked toward Mynydd Tri Arglwydd, which was to be our third hill of the day, between us and it was the upper reaches of Cwm Coeg and a drop of about 150m on easy gradiented land.  Penetrating this upper cwm was a track, one of many that we saw on these hills which give the farmer on quad bike and hill walker access to their grazing flock and the hills respectively.

Mynydd Tri Arglwydd from Fedw Lwyd

Mynydd Coch from Fedw Lwyd

Once summit data were collected we arrived at the area of the bwlch for Fedw Lwyd which is beside the track that made its way up toward the summit of Mynydd Coch.  Another five minutes of data were collected from here before we headed steeply uphill toward the trig pillar.

Gathering data at the bwlch area of Fedw Lwyd

By now the blanket of high grey cloud had started to break up and whites and blues were emerging as we walked up toward the trig pillar, and as I set the Trimble up the sun came out and bathed us in its warmth.

Approaching the summit of Mynydd Coch

Gathering data at the summit of Mynydd Coch

The elevated summit area of Mynydd Coch with a ditch and part of the natural embankment on the right of photo

Mynydd Coch has an unusual summit area as it resembles an ancient hill fort with two distinct embankments and ditches and a large central elevated area which has the modern day trig at its top.  However, the embankments are made of natural rock and I cannot find any evidence that this is in fact an ancient structure.  Whatever the outcome, be it ancient hill fort or not, the summit area is beautifully shaped and the view is excellent with the Pumlumon range, Cadair Idris, the Aran and many other hills on grand display.

Fedw Lwyd from Mynydd Coch

We followed a path from the summit of Mynydd Coch down to very steep ground which gave access onto the area of the bwlch for our next hill; Mynydd Tri Arglwydd.  According to maps this bwlch has two possibilities for its position with the one nearest the summit of Mynydd Coch being the more likely for its critical bwlch.  As we walked down toward it this is what we also visually thought, deciding to leave the bwlch survey until after its summit survey we continued to its high point.

Approaching the summit of Mynydd Tri Arglwydd

The summit of Mynydd Tri Arglwydd consists of heather with a rogue spruce tree edging its way toward it with its lower trunk being about four metres from the highest point.  The Trimble was set up on its improvised tripod and obtained the 0.1m accuracy before data can be logged relatively quickly considering it had a tree trying to interfere with its satellite coverage.

Gathering data at the summit of Mynydd Tri Arglwydd

Mynydd Coch from Mynydd Tri Arglwydd

Once summit data were gathered we retraced our steps down to the connecting bwlch and gathered data from its two positions, with the one, now farthest from the summit of Mynydd Tri Arglwydd, being our favoured one for the critical bwlch position.

Gathering data at the critical bwlch of Mynydd Tri Arglwydd

This part of the walk gave excellent views toward the eastern side of Fedw Lwyd and the south-western upper sides of Mynydd Coch, with the gently sloped western aspect of Mynydd Tri Arglwydd cascading down into Cwm Coeg, with the reclaimed green pasture edging upward to meet the moorland above.

Mynydd Tri Arglwydd from its critical bwlch

The survey of the critical bwlch of Mynydd Tri Arglwydd was likely to be the last of the day, so the Trimble was packed away and we joined a good path that cut across the slope of Mynydd Coch to rejoin with its connecting bwlch to Fedw Lwyd, we bi-passed the latter on a sheep track and rejoined our inward route and descended toward the entrance into part of the sprawling Dyfi Forest.

Mynydd Coch from our descent toward the entrance into the Dyfi Forest

As we stood beside the gate at this entrance to the forest we calculated the time it would take to walk to and hopefully bash our way through the trees to the summit of Mynydd Heulen (SH 776 081) and walk back.  We decided that unless the tree bashing proved easier than we envisaged that this part of the walk was likely to be no more than a scouting expedition for a later ascent.

I’d done a bit of ground work the previous evening and come well prepared with a number of ten figure grid references for where forest tracks joined the one we were now on, where forest tracks then diverged from the one we were now on, and more importantly the ones that Anton Ciritis had documented when he visited the summit of Moel Heulen.

As we walked further into the forest on a good, broad forest track the hill rose up in front of us, it was completely swamped in conifers and seemed impenetrable.  We had a choice, either to attempt to tackle the hill from its north or its south, Anton came up from its south having driven to its base on a forest track.  Running parallel with the forest track is a cycle track, one of many in these hills for off-roaders.  This cycle track would lead to the point where Anton entered the conifer plantation to bash his way up toward a forest break and eventually the summit.

On the forest track with the conifered summit of Moel Heulen ahead of us

We found the cycle track and walked on it back the way we had just come to explore if there was any path entering the conifers toward the summit, there was none.  We then walked on the cycle track parallel with the continuation of our route on the forest track.  We’d been in warm sunshine ever since leaving the last bwlch survey and it was pleasant to now be on a narrow path amongst dappled light as butterflies flew past us and bird song rang out, a gentleness that was all too soon to disappear as we neared the point where Anton had entered the trees.

It seemed that this point was also where a large number of particularly uninviting gorse bushes had staked their claim; we tried farther back on the cycle track and decided that there was a slight glimmer of an entrance somewhere there, where the thick conifer plantation was only semi-thick!!

Slowly we edged our way upward, I don’t think Graham or I had any expectation that we would reach the summit of Moel Heulen today as time dictated that unless we stumbled upon the fire break that leads to this hill’s summit, we would have to come back another day for the joy of this hill’s ascent.

However, slow progress was being made as we ducked into and through the dead lower branches of  a multitude of fir trees, we soon found a greener section which consisted of dead gorse, we followed this up for a few minutes before delving left through more dead branches.  Sunlight tantalisingly penetrated some of the trees and upward progress could definitely be made, although at a cost, as by now we were covered in tree stuff and Graham rather laughingly described my head as looking like a ‘bird’s nest’.

Graham at our high point in the trees

Deciding that our scouting mission had given us inkling toward what the ascent was like and where we would have to enter the forest for further upward progress to be made, we decided that it was time to head back out of the trees and down to the inward forest track.  Before doing so Graham took a ten figure grid reference so we could at least see on the map where we had reached.

Screen grab from the Ordnance Survey enlarged Geograph map with the blue circle indicating where we entered the trees and the green circle indicating our high point

Once back on the track we spent ten minutes getting twigs out of our gear and clothes before heading back to the gate at the forest entrance, which gave access onto the track and open hillsides of greenery and views.

On our way down we stopped next to the old farm house for me to take a few more photos, framing Mynydd Coch against the waters of the pond.  The route back through the deciduous wood was as delightful as the ascent had been.

Mynydd Coch from beside the pool next to Esgair-neiriau

As we walked the last few metres through the wood the houses of Aberllefenni came into view through the newly sprung greenery of fresh leaves, and we were all too soon back at the foot bridge over the Afon Dulas and heading up the short ascent to the awaiting car.

Heading toward the descent through the wood

Last view of Cadair Idris before entering the wood

Crossing the Afon Dulas

It had been another excellent day on the hill, investigating a part of Wales that I had not been to before, with the added bonus of a tree bash and the delicious prospect of having to re-visit the conifered slopes of Moel Heulen to claim an ascent of its summit.


The track of our walk

Postscript:

Since surveying these hills full LIDAR coverage is now available.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height and positional data that is now freely available for England and Wales.  Consequently the numerical details for these hills have been analysed using this technique, and where appropriate LIDAR has been used in preference to that produced by the Trimble.

LIDAR image of Fedw Lwyd (SH 804 093)

 

Survey Result:


Fedw Lwyd

Summit Height:  424.5m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 80491 09399 (Trimble GeoXH 6000)

Bwlch Height:  398.7m (LIDAR)

Bwlch Grid Reference:  SH 80548 09589 (LIDAR)

Drop:  25.7m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  6.06% (Trimble GeoXH 6000 summit and LIDAR bwlch)






Summit Height:  468.3m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference:  SH 80458 09952 (Trimble GeoXH 6000)

Bwlch Height:  313.0m (LIDAR)

Bwlch Grid Reference:  SH 81012 10795 (LIDAR)

Drop:  155.3m (Trimble GeoXH 6000 summit and LIDAR bwlch)

Dominance:  33.15% (Trimble GeoXH 6000 summit and LIDAR bwlch) (Lesser Dominant deletion)





Mynydd Tri Arglwydd

Summit Height:  442.3m (converted to OSGM15)

Summit Grid Reference:  SH 81228 09376

Bwlch Height:  398.9m (converted to OSGM15)

Bwlch Grid Reference:  SH 80826 09777

Drop:  43.3m

Dominance:  9.80%




For further details please consult the Trimble survey spreadsheet click {here}