Wednesday, 20 May 2026

Mapping Mountains – Trimble Surveys – Hirddywel

 

08.05.26  Wenallt (SO 036 712)

The summit of Wenallt (SO 036 712)

Forested summits are not my favourites.  This isn’t surprising as many prove formidable to reach their highest point, entailing pathless slogs through enclosed conifers with skin ripping brambles and other unsavoury undergrowth encountered.  There are also some summits that resemble an assault course due to felled wind blown trees when upward progress seems impossible.  However, on occasion even these can give an unusual feeling of fulfillment if the summit is eventually reached.

Therefore, it wasn’t surprising that I had left Wenallt as my last Pedwar in this area of Wales, as although inviting tracks are shown on the Ordnance Survey 1:25,000 Explorer map, the hill looked a mass of uninviting conifer trees.

With a planned morning visit to the Powys archive at Llandod and knowing that this was my last Pedwar in the Hirddywel group of hills, Aled was enthusiastic for us to visit the hill in the afternoon.  The forecast wasn’t promising with heavy localised showers breaking out after midday, and as we left the archive at its 12.30pm closing time the clouds were massing with the prospect of those showers soon materialising.

It’s only a short drive from Llandod to Abaty Cwm-hir and we were soon parked just off the narrow road at the start of a forest rack.  A metal gate barred further vehicle access, and upon inspection we found this locked, so driving on the forest track to gain height was now out of the question.  Therefore, once walking boots were donned we set off up the wide expanse of gravelled track that led first northward away from the summit before swinging westward back toward it. 

A convenient parking place for the ascent of Wenallt

The early afternoon was slightly muggy and as my younger companion seemed to manage the uphill with hardly a breath out of place, I started to sweat and needed a few rests to try and compose my heartbeat and steady its increased thudding. 

The narrower track leading to the turning place

It was a tranquil scene in the forest, with rising mature conifers spreading toward the sky and occasional birdsong wafting from their heights.  The main forest track soon bisected with the branch we wanted now narrowing and heading south.  This culminated in a grassed area where forestry vehicles could turn.  We now had two options for further progress; one grassed track leading up to two felled trees and a slightly lower path that was narrower and lost a little height.  We opted for the higher one and soon clambered over the trees.  On our descent we headed through the mature forest to join the lower narrower path, and therefore bi-passing the two obstacles. 

The greens and blues of summer

Approaching the grassed turning circle

Having clambered over the two trees we were soon on a delightful path that meandered through the wood, always claiming height on a thankfully steady gradient.  Such paths are seldom found in conifer forests.  The path forever weaved its way up through the wood, with dappled sunlight occasionally casting through the trees, adding a welcome highlight of colour to the scene. 

A direct approach toward the summit looked horrendous

The green track beyond the turning circle with the two fallen trees ahead

Thankfully the forecast showers never materialised in this part of the country, with only a few spots of rain appearing as our route through the trees reached the upper broad easterly ridge of the hill.  Here we swung rightward with the path continuing its delightful meander through the trees. 

On the path that meandered through the wood

Close to the summit another large fallen tree meant a slight diversion was needed, but such occurrences were rare and the ones encountered never difficult to overcome.  Aled reached the summit before me; this comprises a small outcrop with vegetation overflowing from its upper reaches.  The outcrop is easy to get up with only thin branches from enclosing trees as hindrance. 

On the broad easterly ridge leading toward the summit

I followed and with Aled vacating the small area of the high point I soon stood on the summit.  Making our way back down we examined the outcrop and pondered what a lovely ridge walk this would have been prior to the influx of conifers, and what a shame it was that those planting the forestry had no foresight to leave the summit area free of trees. 

Aled on the summit of Wenallt

The outcrop that constitutes the summit of Wenallt

Our route proved ideal, with the upper part of an approach from the west looking horrendous as a jumble of trees barred any passage through.  All that remained was to retrace our steps down the broad easterly ridge before swinging north on our delightful inward path, with Aled leading the way through the mature trees to gain the lower path close to the turning place so we could avoid the two fallen trees clambered over on our ascent.  We were back at the car by 3.15pm, with the walk having taken 1hr 50min.

Another Pedwar visited taking my total to 364 hills, with 448 hills in all it would be tempting to concentrate on the remainder, but my baggng mentality has changed over recent years and I gain almost as much pleasure from repeat ascents as I do from visiting new hills, so for me I doubt I’ll finish this list. 

   

Survey Result:

 

Wenallt

Summit Height:  471.9m (LIDAR) 

Summit Grid Reference:  SO 03697 71231 (LIDAR) 

Bwlch Height:  372.7m (LIDAR)

Bwlch Grid Reference:  SO 03481 72058 (LIDAR)

Drop:  99.2m (LIDAR)

Dominance:  21.01% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet

Tuesday, 19 May 2026

Mapping Mountains - Summit Relocations – The 500-Metre Tops of England and Wales – Deweys

 

Foel Fawr (SH 728 392) 

There has been a Summit Relocation that is retrospective to a hill that is listed in the The 500-Metre Tops of England and Wales, with the summit height, bwlch height and their locations, the drop and status of the hill confirmed by a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips and Aled Williams on the 19th July 2020.

Foel Fawr (SH 728 392)

The criteria for the list that this summit relocation applies to are:

The 500-Metre Tops of England and Wales are affectionately known after their hill list compiler; Michael Dewey.  This list mixes metric and imperial height in its criteria to bookend up to the 2000ft height band and takes in all hills in England, Isle of Man and Wales that are 500m and above and below 2000ft (609.6m) in height that have 30m minimum drop. 

Mountain tables by Michael Dewey

Michael Dewey died on the 5th November 2022.  His wife; Gillian wished for this list to be carried on and made provision for it to be co-authored by Myrddyn Phillips.  Michael will always be the compiler and originator, it’s just that he’s now got a co-author to safeguard this list and carry this list on.

The name the hill is listed by is Foel Fawr and it is adjoined to the Arenig Fach group of hills, which are situated in the central part of North Wales, and it is positioned with the B4391 road to its north, the A470 road to its west and the A4212 road to its south, and has the village of Trawsfynydd towards the south-west.

When the original list of Deweys appeared in the Mountain tables book published by Constable in 1995, this hill was listed with a 528m summit height positioned at SH 726 395, based on the spot height that appears on the Ordnance Survey 1:25,000 Explorer map.

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

Since the original compilation of this list there have been a number of Ordnance Survey 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 are current and 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, and it was this map that showed a 528m map heighted twin summit positioned at SH 728 392.  The two 528m spot heights are also shown on the mapping hosted on the Magic Maps website. 

Extract from the Magic Maps website

However, it was not until the survey with the Trimble GeoXH 6000 that the details for this hill could be accurately re-assessed.  The height and position for each summit is given below: 

 

South-easterly summit:  528.611m at SH 72872 39284 

North-westerly summit:  527.542m at SH 72621 39476 

 

The above detail compared to the original summit position comes within the parameters of the Summit Relocations used within this page heading, these parameters are: 

The term Summit Relocations applies when the high point of the hill is found to be positioned; in a different field, to a different feature such as in a conifer plantation,  within a different map contour either on Ordnance Survey maps or interactive mapping, to a different point where a number of potential summit positions are within close proximity, when natural ground or the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary or covered reservoir that is considered a relatively recent man-made construct, or the listing of a new twin summit or de-twinning of a summit, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist. 

The Trimble GeoXH 6000 gathering data at the higher of the Foel Fawr summits

The Trimble GeoXH 6000 gathering data at the lower of the Foel Fawr summits

Therefore, the summit height produced by the Trimble GeoXH 6000 survey is 528.6m and this is positioned at SH 72872 39284, this position is not given a spot height on contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, but is given a 528m spot height on the mapping hosted on the Magic Maps website, and is approximately 260 metres south-eastward from where the original listed summit is positioned. 

 

The full details for the hill are:

Group:  Arenig Fach

Name:  Foel Fawr

OS 1:50,000 map:  124

Summit Height:  528.6m (converted to OSGM15, Trimble GeoXH 6000)

Summit Grid Reference (New Position):  SH 72872 39284 (Trimble GeoXH 6000)  

Bwlch Height:  485.5m (converted to OSGM15, Trimble GeoXH 6000)

Bwlch Grid Reference:  SH 73074 39525 (Trimble GeoXH 6000)

Drop:  43.1m (Trimble GeoXH 6000 summit and bwlch)

 

Myrddyn Phillips (May 2026)

 

Sunday, 17 May 2026

Mapping Mountains – Trimble Surveys – Way Stone Edge

 

14.04.26  Way Stone Edge (SD 999 140) 

Way Stone Edge (SD 999 140)

Having just visited Dog Hill (SE 003 170) it was only a short drive on the A672 road under the busy M62 to our designated parking place, which was directly west of the summit of our last hill of the day; Way Stone Edge.

This hill is classified as a Four, and also currently as a Subhump, although LIDAR implies that its natural col still exists and therefore under Hump protocols it should be deleted from the ranks of Subs.

By now the weather was definitely turning for the worse with mid afternoon rain forecast.  This could be seen pushing in from the south as slate grey cloud slowly enveloped the surrounds.  This meant it was wise not to linger and as I exited John’s car I asked what path we were heading on, he directed me toward a gate on the opposite side of the road and I was soon on my way following a path amongst copious amounts of reed grass.

Mark and John followed with John soon taking the lead.  The bulk of Way Stone Edge rose in front looming over the bleached moor, with the path quickly turning in to a vehicle track that took us down to a stream.  Going was never difficult, although rather squashy in parts.  John fell close to the stream and floundered to get purchase on the soft grass beside the thin strip of water, I watched as he berated himself which made me smile.  I resisted the temptation of taking a photograph, which in years gone by I may well have done. 

John leading the way down to the stream

Having lost height from the road down to the stream, the up hill now started as we followed a relatively good vehicle track on the moor as it headed up toward a gate and fence, beyond which the going steepened as bleached moor turned to heather and moor grass. 

Beyond the gate and fence the going steepened

Again, the going was never difficult, but that rain was closing in and as we crested the summit plateau Mark used his hand-held GPS to zero in to the summit position.  When we reached this point I checked the LIDAR summit co-ordinates and we were still 250 metres from the high point.  Mark soon input these figures and off we went through the heather toward the LIDAR summit; when there I quickly took a few photographs as the first scuds of wind blown rain hit us. 

The summit of Way Stone Edge

Thankfully I’d taken my storm proof brolly and this was soon up sheltering me from the rain as it swept across the hill.  Our downward route followed a boggy path beside a forlorn looking fence as it headed south-westward before claiming height over the small prominence bump of White Hill. 

The downward route with White Hill in the background

The rain was not constant with only two good scuds hitting us.  As we joined a part of the Pennine Way the path improved as it crossed the summit of White Hill, this eased passage back to the road and John’s awaiting car.  The cloud all round looked threatening, this gave us incentive to quicken our pace down the hill and we arrived back to the shelter of John’s car just before more rain set in.

Way Stone Edge proved a good wild hill to end up on and all that remained was the drive back to Burnley, followed by a welcome large mug of tea and a bite to eat before the drive back to Mark’s and my onward journey to Welshpool. 

 

Survey Result:

               

Way Stone Edge 

Summit Height:  481.6m (LIDAR)  

Summit Grid Reference:  SD 99956 14046 (LIDAR) (summit relocation)

Col Height:  387.8m (LIDAR)

Col Height:  399.6m (LIDAR, natural col)

Col Grid Reference:  SE 01975 09573 (LIDAR)

Col Grid Reference:  SE 02035 09664 (LIDAR, natural col) 

Drop:  93.9m (LIDAR)

Drop:  82.1m (LIDAR, using the natural col) (proposed Subhump deletion)

Dominance:  19.49% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet 

Saturday, 16 May 2026

Mapping Mountains – Summit Relocations – The Welsh P15s

 

Cae Tros Ffordd (SH 797 643) 

There has been a Summit Relocation to a hill that is listed in the The Welsh P15s, 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 Cae Tros Ffordd (SH 797 643)

The criteria for the list that this summit relocation applies to are:

The Welsh P15s – Welsh hills with 15m minimum drop, irrespective of their height, with an accompanying sub list entitled the Welsh Sub-P15s, with the criteria for this sub category being all Welsh hills with 14m or more and below 15m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list appearing on Mapping Mountains on the 10th May 2019. 

The Welsh P15s by Myrddyn Phillips

The name the hill is now listed by is Cae Tros Ffordd, and this was derived from the Tithe map, and it is adjoined to the Mynydd Hiraethog group of hills, which are situated in the northern part of North Wales (Region A, Sub-Region A2), and it is positioned encircled by minor roads with the A470 road farther to its west, and has the town of Llanrwst towards the south.

When the original 100m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website, this hill was not included in the accompanying 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 20m of drop, based on the 129m summit spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and an estimated c 109m bwlch height, based on interpolation of 10m contouring between 100m – 110m. 

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

However, it was not until LIDAR became available that the details for this hill could be accurately re-assessed.  The LIDAR (Light Detection & Ranging) technique produced highly accurate height data that is now freely available for much of England and Wales.

LIDAR analysis gives the highest ground on this hill as 127.6m positioned at SH 79758 64295.  However, this is to the top of a raised field boundary and protocols dictate that as this is deemed a relatively recent man-made construct such ground is discounted from the height of a hill. 

LIDAR summit image of Cae Tros Ffordd (SH 797 643)

The height produced by LIDAR analysis to the natural summit of this hill is 127.1m and is positioned at SH 79756 64305, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:

The term Summit Relocations applies when the high point of the hill is found to be positioned; in a different field, to a different feature such as in a conifer plantation,  within a different map contour either on Ordnance Survey maps or interactive mapping, to a different point where a number of potential summit positions are within close proximity, when natural ground or the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary or covered reservoir that is considered a relatively recent man-made construct, or the listing of a new twin summit or de-twinning of a summit, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist.

Therefore, the summit height produced by LIDAR analysis is 127.1m and is positioned at SH 79756 64305, this position matches that of the spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map and is approximately 10 metres northward from where the high point of the raised field boundary is positioned. 

 

The full details for the hill are: 

Group:  Mynydd Hiraethog 

Name:  Cae Tros Ffordd 

OS 1:50,000 map:  115

Summit Height:  127.1m (LIDAR)                                                           

Summit Grid Reference (New Position):  SH 79756 64305 (LIDAR) 

Bwlch Height:  107.9m (LIDAR) 

Bwlch Grid Reference:  SH 79900 64455 (LIDAR) 

Drop:  19.2m (LIDAR) 

 

Myrddyn Phillips (May 2026)

Thursday, 14 May 2026

Mapping Mountains – Trimble Surveys – Way Stone Edge

 

14.04.26  Dog Hill (SE 003 170) 

Dog Hill (SE 003 170)

Today’s plan was to visit two hills either side of junction 22 on the M62 motorway.  The first of these was Dog Hill which is classified as a Four with 34.5m of drop derived from LIDAR analysis.

Mark and I had overnighted at John Kirk’s in Burnley, having met him the previous day at the White House pub and after a lunchtime meal we missed the heavy localised showers and visited Blake Moor (SD 971 212).  Blake Moor entailed about 7 miles mainly on good tracks beside reservoirs with the customary moor grass and heather ascent followed by a similar descent down to a good track beside another reservoir.  Today each walk would be shorter, and the two hills that Mark and John had planned for us to visit although close in proximity, were very different in nature, with Dog Hill a pleasant ascent on grass whilst Way Stone Edge (SD 999 140) proved an altogether more wild affair with copious amounts of heather and moor grass. 

The path leading up Dog Hill

Having John as our local guide always proves beneficial with good routes up and down the hills chosen, and today for Dog Hill he suggested a pleasant ascent from the south of the summit on what proved a delightful path. 

The beautifully coloured grassland 

We parked in a lay-by on the A672 road close to where it bisects the M62 motorway.  The path heading up the hill was on the opposite side of the road and continued up through a myriad of delicate swaying grass whose colour mesmerized in a simple beauty.  This time of year before the fresh green growth of late spring and summer has chance to dominate, the grass on moorland hills takes on a bleached affect where gentle yellows cascade across the land and today the colour was on a stunningly subtle display. 

Mark on the ascent with the M62 and Way Stone Edge as backdrop

Our route up eventually left the beautiful coloured grassland and gained height around the upper southerly bowl of the hill; stopping to admire the scene I photographed Mark following us up with the thin slither of cars heading over the moor on the M62 as backdrop with the higher Way Stone Edge (SD 999 140) beyond. 

John on the path on the upper southerly bowl of the hill 

We were soon on the summit which has a trig pillar with the high point of the hill about seven metres from its base.  I had used LIDAR to determine the height and drop of this hill when Aled and I recently updated the listing of The Fours – The 400m Hills of England, therefore although I’d brought the Trimble I had no intention of surveying the summit as LIDAR would suffice.  However, I did place the equipment on my rucksack for its customary summit photograph. 

The summit of Dog Hill

Leaving the summit we headed down on our inward path around the upper bowl of the hill and down through that beautifully coloured grassland with the buzz of the motorway dulled in the background.  Next stop the wild delights of Way Stone Edge. 

 

Survey Result: 

               

Dog Hill 

Summit Height:  434.9m (LIDAR)  

Summit Grid Reference:  SE 00313 17079 (LIDAR)

Col Height:  400.4m (LIDAR)

Col Grid Reference:  SD 98466 17076 (LIDAR) 

Drop:  34.5m (LIDAR)

Dominance:  7.93% (LIDAR)

 

 

For further details please consult the Trimble Survey Spreadsheet