Friday, 13 November 2026

Mapping Mountains – Trimble Surveys – Mullach Coire Mhic Fhearchair

 

11.07.26  Meall Feith Rabhain (NG 883 948)

Meall Feith Rabhain (NG 883 948)

To the north-west of the small community of Laide lies a rounded peninsula of small heighted hills and lochans which are interspersed with a few minor roads, tracks, rocky coves and sanded beaches.  It gives an appealing sense of space and peacefulness, where the course of life is slow.

We now had limited time for hill walking as other necessary duties called.  A walk combining two 400m hills was considered as indeed was visiting a 500m hill, but having passed a small hill two days before on our way to the sanded beach of Camas a’ Charraig and the two hills to its north, Mark had indicated a small qualifying P30 hill just to the west of the minor road that would fill an hours wander.  However, even from the road the fairly large summit erratic could be easily seen.  Reports on the Hill Bagging website gave varying accounts of reaching its top, and more where unsuccessful attempts were made and some where reaching the ground at its base was sufficient.  This did not bode well for three people whose bodies are no longer as young and lithe as they once were.  The question was asked to Mark ‘have you a ladder?’  When the reply was ‘yes’ and when the ladder looked more like a futuristic science experiment compared to the bog standard wooden ladder of norm, it was all systems go for our little trip, with our extendable ladder in hand heading to the summit of Meall Feith Rabhain. 

The ladder resembled a futuristic science experiment

A convenient pull-in place gave us easy access to the hill over the wired fence straddling forlornly just below the minor road where we parked.  John took the ladder and as Mark and I veered north-westward around the northern flank of an intermediary bump, John headed with ladder under his arm over it. 

John heading off with the ladder

Either side of the small bump was an option for the main summits critical bealach.  As the hill is listed as a relatively marginal P30 Mark was enthusiastic for this to be surveyed along with its summit.  By surveying its summit first it gave us an opportunity to assess its bealach on the way, both on the ground as we walked over or near it and from above as height was gained so we could look down upon it.  By doing this we all concluded that the lower of the low options and therefore its critical point was the most easterly, the one close to the wired fence adjacent to the minor road where John’s car was parked. 

Taking divergent paths with John and the ladder in the background

Mark heading for the summit

By now Mark and I had gained the steepening northern flank of the main hill, whilst John had found a path that gave him relatively easy access to the high point and the large erratic boulder perched at the summit. 

Steepening ground

The large erratic at the summit

Before John and Mark erected the ladder and put it in place we all had a good look around the erratic boulder.  There seemed to be just one place for a foothold that for those lithe in body and enthusiastic in spirit may be sufficient for an ascent.  We of course had our ladder. 

Having carried the ladder to the top John enjoyed its convenience to reach the summit 

As John made his way up the ladder to the top of the erratic I stood back and took a number of photographs of him suitably posed on its summit.  After he made his way down, Mark then went up, and once down it was my turn. 

John on the summit

My time perched on its high point was gong to be much longer than John’s and Mark’s as I wanted to gather data.  This was complicated by it having a relatively large cairn and a metal spike, come cross stuck in the numerous rocks that constituted the cairn.  These were too numerous to consider removing, however the metal cross could easily be put to one side and proved useful as an aid to take a measurement offset between the highest rock of the cairn, which was used for the Trimble placement and the highest part of the erratic still on show at the base of the cairn. 

View from the top

Once the offset was noted I set the Trimble up and waited for the 0.1m accuracy level to be attained before data should be logged.  Once this appeared on the screen I pressed ‘Log’ and hunkered down on the erratic making sure not to slip off and importantly making sure my body was below the Trimble so as not to disturb satellite reception.  Curled up in this position at the top of a large erratic is a novel experience, one that I’m sure I’ve done before but as of now cannot remember where. 

The Trimble set-up position at the summit of Meall Feith Rabhain

As the minutes passed I wanted to stretch one leg but remembered where I was and thought keeping the edge of this legs walking boot on the erratic to be a safer option.  The five minutes of data collection was finally up and I emerged from my curled up position to close the equipment down.  I now wanted to take a few photographs which proved rather difficult as I had little room to manoeuvre, but once done I then made my way back down the ladder which had been removed during data collection and was now back in place and held by John and Mark. 

Hunkered down and waving for the camera.  Photo: John Kirk

We left the summit with me carrying the ladder following John as he made his way down his ascent route toward the path crossing the second option for the bealach, whilst Mark headed down the way he and I had ascended.  Once over this bealach John carried the ladder over the intermediary bump toward where the three of us considered the critical bealach to be positioned. 

Leaving the summit

As John headed down to the bealach I waited for Mark, this gave us opportunity to assess John’s bealach position from above.  We then joined him.  As I set the Trimble up to gather data Mark and John and the ladder where back at the car waiting for another five minute data set to be gathered and stored. 

The Trimble GeoXH 6000 gathering data at the bealach of Meall Feith Rabhain

It felt good to be standing in a bog laden col again, something I had not done in a long while.  These times standing in bogs are unusually fulfilling, with time to look and take in one’s surroundings.  As the Trimble beeped away gathering its all-important individual datum points I scribbled all necessary information in my surveying notebook, and once the allotted data were gathered and stored I squelched my way back to the equipment to turn it off. 

Cloud capped Slioch

It had been a fun experience visiting Meall Feith Rabhain and proved a good hill to end on, as this was our last full day in Scotland, and all that now remained was a meal out in Gairloch before the next morning’s packing of the car.  Leaving Laide we took a different route from our inward approach and headed south toward Loch Maree for views of Slioch and its cloud cloaked summit, it proved a beautiful and fitting sight to end our Scottish trip on. 

 

Survey Result:

 

Meall Feith Rabhain

Summit Height:  89.4m (converted to OSGM15) 

Summit Grid Reference:  NG 88388 94829

Bealach Height:  55.7m (converted to OSGM15)

Bealach Grid Reference:  NG 88607 94730

Drop:  33.8m

Dominance:  37.76%

 

 

My thanks to Alan Dawson with help processing these data

 

For further details please consult the Trimble Survey Spreadsheet

Tuesday, 10 November 2026

Mapping Mountains – Significant Name Changes – The Welsh P15s

 

Braich Bryn Engan (SH 720 568) 

There has been a Significant Name Change to a hill that is listed in 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 Braich Bryn Engan (SH 720 568)

The criteria for the list that this name change 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 hill is adjoined to the Moel Siabod group of hills, which are situated in the north-western part of North Wales (Region C, Sub-Region C1A), and it is positioned with the A4086 road to its north-west and the A5 road to its north-east, and has the village of Capel Curig towards the north.

When the listing that became known as The Welsh P15s was being compiled, this hill was not included in either the main list or the accompanying sub list, with subsequent interpolation provisionally listing the hill under the point (Pt. c 335m) notation with an estimated c 335m summit height and an estimated c 327m bwlch height, with both heights based on interpolation of 10m contouring. 

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

As the summit of this hill comprises bounded land the details for it were examined on the Tithe map.  The term Tithe map is generally given to a map of a Welsh or English parish or township and which was prepared after the 1836 Tithe Commutation Act.  This act allowed tithes to be paid in cash rather than goods.  The Tithe maps gave names of owners and occupiers of land in each parish and importantly for place-name research they also included the name of enclosed land.  This enclosed land is usually based on a field system, however not every field is given a name, but many are and especially so in Wales. 

Extract from the Tithe map

The enclosed land where the summit of this hill is situated is given the number 66 on the Tithe map, this can be cross referenced against the apportionments; it is these apportionments that give the name of the owner or occupier of the land as well as the name of the land.  The land where the summit of this hill is situated is named Bryn Engan in the apportionments, with the hill being Braich Bryn Engan, with the details on the Tithe map appearing in the parish named as Llanrwst and in the county named as Caernarfonshire. 

Extract from the apportionments

Therefore, the name this hill is now listed by in the The Welsh P15s is Braich Bryn Engan, and this was partly derived from the Tithe map. 

 

The full details for the hill are: 

Group:  Moel Siabod 

Name:  Braich Bryn Engan 

Previously Listed Name:  Pt. c 335m 

OS 1:50,000 map:  115

Summit Height:  339.9m (LIDAR) 

Summit Grid Reference:  SH 72062 56877 (LIDAR)                                                  

Bwlch Height:  334.0m (LIDAR) 

Bwlch Grid Reference:  SH 71985 56818 (LIDAR) 

Drop:  15.9m (LIDAR) 

                                                           

Myrddyn Phillips (November 2026)

 

Saturday, 7 November 2026

Mapping Mountains – Significant Height Revisions – The 500-Metre Tops of England and Wales – Deweys


Craig Dolfudr – North Top (SH 822 317) 

There has been a Significant Height Revision 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 derived from LIDAR analysis conducted by Aled Williams. 

LIDAR image of Craig Dolfudr - North Top (SH 822 317)

The criteria for the list that this height revision 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 and carry this list on.

The name given the hill by Michael Dewey is Craig Dolfudr – North Top and it is adjoined to the Arenig Fawr group of hills, which are situated in the central part of North Wales, and it is positioned with a minor road to its north and the A494 road to its south-east, and has the small community of Llanuwchllyn towards the east south-east.

Extract from the Ordnance Survey 1:50,000 Landranger map

When the original list of Deweys appeared in the Mountain tables book published by Constable in 1995, this hill was listed with a 519m summit height, based on the spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. 

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

Since the original publication of this list 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 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, and it is the Ordnance Survey series of Six-Inch maps that formed the basis in the change of the listed height of this hill.

The Ordnance Survey series of Six-Inch maps formed the base map Ordnance Survey used for many decades leading to the production of the 1:10,000 Series of maps, both have now been superseded by the digitised Master Map, and it is this series of maps that give a 1709.9ft (521.18m) Bench Mark on the summit of this hill. 

Extract from the Ordnance Survey series of Six-Inch maps

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 summit image of Craig Dolfudr - North Top (SH 822 317)

LIDAR analysis gives the summit of this hill as 521.4m positioned at SH 82250 31702, and this comes within the parameters of the Significant Height Revisions used within this page heading, these parameters are:

The term Significant Height Revisions applies to any listed hill whose interpolated height and Ordnance Survey, Harvey or other interactive map summit spot height has a 2m or more discrepancy when compared to the survey result produced by the Trimble GeoXH 6000 or other GNSS equipment or analysis of data produced via LIDAR.  Also included are hills whose summit map data is missing an uppermost ring contour when compared with the data produced by the Trimble or by LIDAR analysis.

Therefore, the new listed summit height of this hill is 521.4m and this was derived from LIDAR analysis, this is 2.4m higher than the originally listed summit height of 519m, which was based on the spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map. 

 

The full details for the hill are:

Group:  Arenig Fawr

Name:  Craig Dolfudr – North Top

OS 1:50,000 map:  124, 125

Summit Height (New Height):  521.4m (LIDAR)

Summit Grid Reference:  SH 82250 31702 (LIDAR)  

Bwlch Height:  444.8m (LIDAR)

Bwlch Grid Reference:  SH 81324 31319 (LIDAR)

Drop:  76.6m (LIDAR)

 

Myrddyn Phillips (November 2026) 







Wednesday, 4 November 2026

Mapping Mountains – Hill Reclassifications – The Fours – The 400m Hills of England


Doe Tor (SX 542 848) – Sub-Four addition

There has been an addition to the listing of the The Fours – The 400m Hills of England, with the summit height, col height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips. 

LIDAR image of Doe Tor (SX 542 848)

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

The Fours – The 400m Hills of England - English hills at or above 400m and below 500m in height that have 30m minimum drop, accompanying the main list is a sub list entitled the Sub-Fours, the criteria for which are all English hills at or above 400m and below 500m in height that have 15m or more and below 30m of drop.  The list is co-authored by Myrddyn Phillips and Aled Williams and is available to download in Google Doc format from the Mapping Mountains site.

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

The name the hill is listed by is Doe Tor, and it is adjoined to the High Willhays group of hills, which are situated in the south-west of England, and it is positioned with the A386 road to its west, and has the village of Lydford also towards the west.

When the Introduction to the first group of hills for the updated and revised listing of the The Fours – The 400m Hills of England was published by Mapping Mountains on the 10th September 2022, it was announced that the accompanying sub lists were being revised with the two 390m categories dispensed with and the criteria and name of the 400m Sub-Fours revised.  The one accompanying sub list is now named the Sub-Fours with its criteria being all English hills 400m and above and below 500m in height that have 15m and more and below 30m of drop.

Prior to this revision this hill was not listed, as although the Ordnance Survey 1:25,000 Explorer map has a 425m summit spot height, it is missing the 410m and 420m ring contours for this hill, which makes interpolation for the col height and the drop value difficult. 

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 addition of this hill to Sub-Four status is due to LIDAR analysis, resulting in a 424.9m summit height and a 407.6m col height, with these values giving this hill 17.3m of drop, which is sufficient for it to be classified as a Sub-Four. 

 

The full details for the hill are:

Group:  High Willhays

Name:  Doe Tor

OS 1:50,000 map:  191

Summit Height:  424.9m (LIDAR)

Summit Grid Reference:  SX 54204 84832 (LIDAR)

Col Height:  407.6m (LIDAR)

Col Grid Reference:  SX 54413 84829 (LIDAR)

Drop:  17.3m (LIDAR)

 

For the additions, deletions and reclassifications to The Fours – The 400m Hills of England reported on Mapping Mountains since the December 2013 publication of the 1st edition of this list by Europeaklist please consult the following Change Registers:

 

The Fours

 

Sub-Fours

 


Myrddyn Phillips and Aled Williams (November 2026)