Mapping Mountains – Summit Relocations – 200m Twmpau

 

Stingwern Wood (SJ 145 000) 

There has been a Summit Relocation to a hill that is listed in the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Stingwern Wood (SJ 145 000)

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

200m Twmpau – Welsh hills at or above 200m and below 300m in height that have 30m minimum drop, with an accompanying sub category entitled the 200m Sub-Twmpau consisting of all Welsh hills at or above 200m and below 300m in height that have 20m or more and below 30m of drop.  With the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.

The 200m Twmpau by Myrddyn Phillips

The name the hill is now listed by is Stingwern Wood, and it is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads with the B4390 road further to its north, the B4389 road further to its west and the A483 road further to its south-east, and has the village of Aberriw (Berriew) towards the east. 

When the original 200m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website the qualifying hill was included in the main P30 list with a summit height of 251m positioned at SJ 154 997, which was taken from the spot height that appears on the Ordnance Survey 1:25,000 Explorer map. 

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

After the accompanying sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed with an estimated c 60m of drop, based on an estimated c 258m summit height and an estimated c 198m bwlch height, with both values based on interpolation of 10m contouring that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, with the summit also relocated to SJ 145 000. 

The summit of this hill has now been surveyed with the Trimble GeoXH 6000, resulting in 260.0m at SJ 14514 00063 and this height comes within the parameters of the Summit Relocations used within this page heading, these parameters are: 

The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, to a different feature such as in a conifer plantation, placed within a different map contour, to a different point where a number of potential summit positions are within close proximity, or 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 that is judged to be a relatively recent man-made construct, 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 summit of Stingwern Wood

Therefore, the new listed summit height for this hill is 260.0m and is positioned at SJ 14514 00063, this position is not given a spot height on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and is approximately 1km west north-westward from where the originally listed summit is positioned. 

 

ills of Wales, and are reproduced below@

The full details for the hill are:

Group:  Carnedd Wen

Name:  Stingwern Wood

OS 1:50,000 map:  136

Summit Height:  260.0m (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference (New Position):  SJ 14514 00063 (Trimble GeoXH 6000) 

Bwlch Height:  c 198m (interpolation) 

Bwlch Grid Reference:  SJ 14414 00402 (interpolation) 

Drop:  c 62m (Trimble GeoXH 6000 summit and interpolated bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

Mapping Mountains – Significant Height Revisions – 200m Twmpau

 

Stingwern Wood (SJ 145 000)

There has been a Significant Height Revision to a hill that is listed in the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Stingwern Wood (SJ 145 000)

The criteria for the list this height revision affects are: 

200m Twmpau – Welsh hills at or above 200m and below 300m in height that have 30m minimum drop, with an accompanying sub list entitled the 200m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 200m and below 300m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward. 

The 200m Twmpau by Myrddyn Phillips

The name the hill is now listed by is Stingwern Wood, and it is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads with the B4390 road further to its north, the B4389 road further to its west and the A483 road further to its south-east, and has the village of Aberriw (Berriew) towards the east. 

When the original 200m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website the qualifying hill was included in the main P30 list with a summit height of 251m positioned at SJ 154 997, which was taken from the spot height that appears on the Ordnance Survey 1:25,000 Explorer map. 

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

After the accompanying sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-assessed and it was listed with an estimated c 60m of drop, based on an estimated c 258m summit height and an estimated c 198m bwlch height, with both values based on interpolation of 10m contouring that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, with the summit also relocated to SJ 145 000. 

The summit of this hill has now been surveyed with the Trimble GeoXH 6000, resulting in 260.0m at SJ 14514 00063 and this height 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 summit height and Ordnance Survey or Harvey map summit spot height has a 2m or more discrepancy when compared to the survey result produced by the Trimble GeoXH 6000 or analysis of data produced via LIDAR.  Also included are hills whose summit map data is missing an uppermost ring contour when compared to the data produced by the Trimble or by LIDAR analysis. 

The Trimble GeoXH 6000 gathering data at the summit of Stingwern Wood

Therefore, this hill’s new listed summit height is 260.0m and this was derived from a Trimble GeoXH 6000 survey, this is positioned at SJ 14514 00063 and is 2.0m higher than its previously listed height of c 258m and 9.0m higher than the origin qualifying listed summit of 251m, with the former based on interpolation of contours and the latter taken from the spot height on the Ordnance Survey 1:25,000 Explorer map. 

 

The full details for the hill are:

Group:  Carnedd Wen

Name:  Stingwern Wood

OS 1:50,000 map:  136

Summit Height (New Height):  260.0m (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference:  SJ 14514 00063 (Trimble GeoXH 6000) 

Bwlch Height:  c 198m (interpolation) 

Bwlch Grid Reference:  SJ 14414 00402 (interpolation) 

Drop:  c 62m (Trimble GeoXH 6000 summit and interpolated bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

  

Mapping Mountains – Significant Name Changes – 200m Twmpau

Stingwern Wood (SJ 145 000) 

There has been a Significant Name Change to a hill that is listed in the 200m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and a Trimble GeoXH 6000 survey conducted by Myrddyn Phillips. 

Stingwern Wood (SJ 145 000)

The criteria for the list that this name change applies to are: 

200m Twmpau - Welsh hills at or above 200m and below 300m in height with 30m minimum drop, with an accompanying sub list entitled the 200m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 200m and below 300m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward. 

The 200m Twmpau by Myrddyn Phillips

The hill is adjoined to the Carnedd Wen group of hills which are situated in the south-eastern part of North Wales (Region A, Sub-Region A4), and it is encircled by minor roads with the B4390 road further to its north, the B4389 road further to its west and the A483 road further to its south-east, and has the village of Aberriw (Berriew) towards the east. 

The qualifying hill appeared in the original 200m Welsh P30 list on Geoff Crowder’s v-g.me website listed at SJ 154 997 and under the invented and transposed name of Pen Cefnblewog, with an accompanying note stating; Name from buildings to the East.

 

Pen Cefnblewog

251m

SO154997

136

215

Name from buildings to the East.

During my early hill listing I thought it appropriate to either invent a name for a hill, or use a name that appeared near to the summit of the hill on Ordnance Survey maps of the day.  My preference was to use farm names and put Pen, Bryn or Moel in front of them.  This is not a practice that I now advocate as with time and inclination place-name data can be improved either by asking local people or by examining historic documents, through this form of research an appropriate name for the hill can usually be found. 

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

The qualifying summit of this hill has now been confirmed and relocated from its originally listed position and as the name Stingwern Wood appears close to the relocated summit on the contemporary Ordnance Survey 1:25,000 Explorer map, and as this name is applicable to the wood where the summit of this hill is situated, this is an appropriate name to use for listing purposes for this hill. 

Therefore, the name this hill is now listed by in the 200m Twmpau is Stingwern Wood, and this was derived from the Ordnance Survey 1:25,000 Explorer map. 

 

The full details for the hill are:

Group:  Carnedd Wen

Name:  Stingwern Wood

Previously Listed Name:  Pen Cefnblewog   

OS 1:50,000 map:  136

Summit Height:  260.0m (converted to OSGM15, Trimble GeoXH 6000) 

Summit Grid Reference:  SJ 14514 00063 (Trimble GeoXH 6000) 

Bwlch Height:  c 198m (interpolation) 

Bwlch Grid Reference:  SJ 14414 00402 (interpolation) 

Drop:  c 62m (Trimble GeoXH 6000 summit and interpolated bwlch) 

 

Myrddyn Phillips (March 2021)

 

 

 

 

 

  

Mapping Mountains – Trimble Surveys – Carnedd Wen

 

15.09.20  Stingwern Wood (SJ 145 000)  

Stingwern Wood (SJ 145 000)

When I compiled the original 200m height band of Welsh P30s I’d listed the summit position of this hill as SO 154 997 with an accompanying note stating; Higher tops may exist to the West and North-West.  When these height bands of P30s were compiled I was reliant upon the newly published Ordnance Survey 1:25,000 Explorer maps and favoured these over the 1:50,000 Landranger maps for summit and bwlch heights, and as the other tops had no spot height, it was the 251m spot heighted summit that was prioritised. 

Digital mapping now give the highest point and therefore the hill’s qualifying summit within the furthest north-westerly 250m ring contour, which is given a 258m summit spot height on the interactive mapping on the Magic Maps and WalkLakes websites. 

This higher top is a part of Stingwern Wood and was the third of a hoped for 13 hills during our day’s travels.  We’d already visited Beddau (SO 185 977) and Pt. 185.9m (SO 181 991) and by 9.20am were parked at the start of a track close to Stingwern Cottage to the south-west of the summit. 

The promised warm sunshine was now upon us as the light grey early morning clouds were opened up.  Leaving the car we headed up the track for a short distance before veering right on to an open field which rose steeply toward a gate. 

By now we could see the wood which encloses the upper part of the hill; however a large section had been felled which gave hope that our ascent would be a relatively easy one.  The gate led in to another field which we contoured close to its boundary heading toward a fence corner and another gate.

Alex heading toward the summit of Stingwern Wood

Alex led the way toward the gate and the fence corner where woodland sprang up on our right, whilst the felled section looked much more inviting on our left.  An old wooded track led through the remains of the felled section toward the summit of the hill.  Within a few minutes we were standing on its high point, and the route here was remarkably easy compared to what we had both expected. 

The summit of Stingwern Wood now comprises scrub land that was once wooded, with the morning’s sunlight highlighting delicate long grasses that gently swayed in any welcome breeze that meandered across the hill. 

As the Trimble gathered its allotted data Alex headed on the continuation of the indistinct track further in to the wood, whilst I stood a few metres away from the survey equipment as it quietly beeped away gathering its individual data points. 

Gathering data at the summit of Stingwern Wood

When Alex re-joined me I closed the equipment down, packed it away and we headed back on our inward route following the track toward the fence corner.  To our north-west the higher Stingwern Hill was bathed in morning light with lines of trees following water courses and boundaries breaking up an otherwise green pastured scene where cattle grazed in the lower foreground.  It was a quiet scene and one typical of this part of Wales. 

The view toward Stingwern Hill

Departing from our inward route we continued on the track through the scrub undergrowth to a gate which gave direct access to the first field we had walked up on our ascent.  We were soon back at the car; 55 minutes after leaving it.  Our next hill, which was the fourth and highest of the day was Stringwern Hill (SJ 132 014), which we had both previously visited. 

 

Survey Result:

 

Stingwern Wood (significant name change)  

Summit Height:  260.0m (converted to OSGM15, Trimble GeoXH 6000) (significant height revision)

Summit Grid Reference:  SJ 14514 00063 (Trimble GeoXH 6000) (summit relocation confirmed)

Bwlch Height:  c 198m (interpolation)

Bwlch Grid Reference:  SJ 14414 00402 (interpolation)

Drop:  c 62m (Trimble GeoXH 6000 summit and interpolated bwlch)

Dominance:  23.86% (Trimble GeoXH 6000 summit and interpolated bwlch)

 

 

For further details please consult the Trimble Survey Spreadsheet