Thursday, 13 July 2017

Mapping Mountains – Hill Reclassifications – Y Pedwarau


Y Pedwarau – Hill Reclassifications

Y Pedwarau are the Welsh hills at or above 400m and below 500m in height that have a minimum drop of 30m.  Accompanying the main P30 list are five sub lists; these are the 500m Sub-Pedwar, 500m Double Sub-Pedwar, 400m Sub-Pedwar, 390m Sub-Pedwar and 390m Double Sub-Pedwar category’s, with their criteria detailed in the respective Change Registers that have been created and which are linked in their above titles, with the Introduction to this list being linked in the above title.

The list is co-authored by Myrddyn Phillips and Aled Williams and the posts that have appeared on Mapping Mountains detailing the additions, reclassifications and deletions to the main P30 list and the sub lists appear below presented chronologically in receding order.








Mapping Mountains - Hill Reclassifications - Y Pedwarau

Pt. 389.3m (SN 952 552) – 390m Sub-Pedwar deletion (55th reclassification)


There has been a deletion to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being deleted from the 390m Sub-Pedwar category.  The criteria for 390m Sub-Pedwar status being all Welsh hills at or above 390m and below 400m in height that have a minimum 30m of drop.

Prior to analysis of LIDAR data the hill was listed with 76m of drop based on the 390m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and the 314m bwlch spot height that appears on the Ordnance Survey enlarged mapping hosted on the Geograph website.

The hill is situated in the Elenydd range with its Cardinal Hill being Gorllwyn (SN 917 590and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), the hill is positioned between the small communities of Llanafan Fawr to the east north-east and Glandulas towards the south.

As the hill is not a part of designated open access land permission to visit should be sought, if permission is granted there are public footpaths that approach the hill from the north, west and south.

The hill is being listed by the point (Pt. 389.3m) notation as the authors do not know an appropriate name for it either from local enquiry or from historical research, and its deletion from 390m Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Pt. 389.3m

Summit Height:  389.3m

Summit Grid Reference:  SN 95203 55201

Bwlch Height:  314.4m

Bwlch Grid Reference:  SN 95556 55887

Drop:  74.9m


Therefore, the 389.3m LIDAR data produced for the summit position at SN 95203 55201 and the 314.4m LIDAR data produced for the bwlch position at SN 95556 55887 gives this hill 74.9m of drop and with its summit height being below 390m it is insufficient for its continued inclusion as a 390m Sub-Pedwar.


The full details for the hill are:

Cardinal Hill:  Gorllwyn

Summit Height:  389.3m (LIDAR data)

Name:  Pt. 389.3m

OS 1:50,000 map:  147

Summit Grid Reference:  SN 95203 55201

Drop:  74.9m (LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The total for the 390m Sub-Pedwarau decreases by one to 37 hills and the total for the 390m Double Sub-Pedwarau remains at 26 hills.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (July 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Disgwylfa (SN 982 663) – 400m Sub-Pedwar deletion (54th reclassification)


There has been a deletion to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being deleted from the 400m Sub-Pedwar category.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was listed with 20m of drop based on the 477m summit spot height and the 457m bwlch spot height that appear on the Ordnance Survey enlarged mapping hosted on the Geograph website.

The hill is situated in the Hirddywel range with its Cardinal Hill being Gwastedyn Hill (SN 986 661and is placed in the Region of Mid and West Wales (Region B, Sub-Region B1), and is positioned above the A 470 road which is to its north-west and has the town of Rhaeadr Gwy (Rhayader) to the north north-west.

As the summit of the hill is not a part of designated open access land permission should be sought to visit, however common sense should prevail as the summit is a local landmark and as the name of the hill implies it is a look out position, and as open access land is close to the high point to its immediate south, a visit to its summit should not course any dispute.

The name of the hill is Disgwylfa, although the area of the summit is also named as a part of Gwastedyn Hill, and its deletion from 400m Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Disgwylfa

Summit Height:  475.5m

Summit Grid Reference:  SN 98210 66310

Bwlch Height:  456.1m

Bwlch Grid Reference:  SN 98422 66294

Drop:  19.4m


Therefore, the 475.5m LIDAR data produced for the summit position at SN 98210 66310 and the 456.1m LIDAR data produced for the bwlch position at SN 98422 66294 gives this hill 19.4m of drop which is insufficient for its continued inclusion as a 400m Sub-Pedwar.


The full details for the hill are:

Cardinal Hill:  Gwastedyn Hill

Summit Height:  475.5m (LIDAR data)

Name:  Disgwylfa

OS 1:50,000 map:  136, 147

Summit Grid Reference:  SN 98210 66310

Drop:  19.4m (LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 218 with 25 hills being added and 20 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Disgwylfa (SN 982 663) is now deleted from the 400m Sub-Pedwar category

Myrddyn Phillips and Aled Williams (July 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Cyrnau Mawr (SN 751 750) – 390m Double Sub-Pedwar addition (53rd reclassification)

Survey post for Cyrnau Mawr


There has been an addition to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams and subsequently confirmed via a survey with the Trimble GeoXH 6000.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being included in the 390m Double Sub-Pedwar category.  The criteria for 390m Double Sub-Pedwar status being  all Welsh hills at or above 390m and below 400m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was not classified but it was catalogued with c 16m of drop based on an estimated c 390m summit height and an estimated c 374m bwlch height, the latter height based on bwlch contouring between 370m – 380m.

The hill is a part of the Elenydd range with its Cardinal Hill being Pen y Garn (SN 798 771) and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2).  The hill is situated with the B 4574 to its north and the B 4343 to its west and is positioned between the small communities of Pontarfynach (Devil’s Bridge) to its north-west and Cwmystwyth to its east south-east.  

For those wishing to visit the summit the whole upper section of the hill is a part of designated open access land, and this has immediate access from the B 4343 to the west or from a public footpath from the same road that intersects with the open access lane.

The name of the hill is Cyrnau Mawr and its addition to 390m Double Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Cyrnau Mawr

Summit Height:  391.4m

Summit Grid Reference:  SN 75155 75007

Bwlch Height:  369.8m

Bwlch Grid Reference:  SN 75343 74906

Drop:  21.6m


Therefore, the 391.4m LIDAR data produced for the summit position at SN 75155 75007 and the 369.8m LIDAR data produced for the bwlch position at SN 75343 74906 gives this hill 21.6m of drop which is sufficient for its inclusion as a 390m Double Sub-Pedwar, with the details from the Trimble GeoXH survey being 391.4m (converted to OSGM15) summit at SN 75154 75006 and 369.8m (converted to OSGM15) bwlch at SN 75342 24906, giving this hill 21.6m of drop. 


The full details for the hill are:

Cardinal Hill:  Pen y Garn

Summit Height:  391.4m (converted to OSGM15 Trimble, and LIDAR data)

Name:  Cyrnau Mawr

OS 1:50,000 map:  135, 147

Summit Grid Reference:  SN 75154 75006  

Drop:  21.6m (converted to OSGM15 Trimble, and LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The total for the 390m Sub-Pedwarau remains at 38 hills, whilst the total for the 390m Double Sub-Pedwarau increases by one to 26 hills.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:









Cyrnau Mawr (SN 751 750) confirmed as a 390m Double Sub-Pedwar







Mapping Mountains - Hill Reclassifications - Y Pedwarau

Pt. 459.9m (SN 768 794) – 400m Sub-Pedwar deletion (52nd reclassification)


There has been a deletion to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being deleted from the 400m Sub-Pedwar category.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was listed with c 20m of drop based on the 459m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 439m based on interpolation of bwlch contouring between 430m – 440m.

The hill is situated in the Elenydd range with its Cardinal Hill being Draws Drum (SN 790 811and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is positioned with the small community of Pontarfynach (Devil’s Bridge) to the south-west and Ponterwyd to the north-west.

The hill is a part of designated open access land and can be accessed directly from the A 4120 and B 4343 roads which are to the west of the summit, public footpaths also give access to the open access land and originate towards the north-west and the west respectively, otherwise if wanting to visit the hill a longer route can be devised that takes in a number of adjacent hills.

The hill is being listed under the point (Pt. 459.9m) notation as an appropriate name for it either from local or historical research is not known by the authors, and its deletion from 400m Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Pt. 459.9m

Summit Height:  459.9m (converted to OSGM15)

Summit Grid Reference:  SN 76846 79457

Bwlch Height:  439.9m (converted to OSGM15)

Bwlch Grid Reference:  SN 77051 79549

Drop:  19.98m


Therefore, the 459.9m LIDAR data produced for the summit position at SN 76846 79457 and the 439.9m LIDAR data produced for the bwlch position at SN 77051 79549 gives this hill 19.98m of drop which is insufficient for its continued inclusion as a 400m Sub-Pedwar.


The full details for the hill are:

Cardinal Hill:  Draws Drum

Summit Height:  459.9m (converted to OSGM15, LIDAR data)

Name:  Pt. 459.9m

OS 1:50,000 map:  135, 147

Summit Grid Reference:  SN 76846 79457

Drop:  19.98m (converted to OSGM15, LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 219 with 25 hills being added and 19 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Coed yr Artsh (SN 764 760) – 400m Sub-Pedwar addition (51st reclassification)


There has been an addition to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being added to the 400m Sub-Pedwar category.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was not classified, but it was catalogued with c 18m of drop based on the 444m summit spot height on the Ordnance Survey enlarged mapping hosted on the Geograph website and an estimated bwlch height of c 426m based on interpolation of bwlch contouring between 420m – 430m.

The hill is situated in the Elenydd range with its Cardinal Hill being Pen y Garn (SN 798 771and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is positioned with the small community of Pontarfynach (Devil’s Bridge) to the west north-west and Cwmystwyth to the south-east.

The hill is not a part of designated open access land and therefore permission to visit should be sought, however it is a part of a large conifer forest that has many designated forest walks in it, and according to Ordnance Survey maps a path leaves one of these walks and heads through to trees to the summit, if this path exists on the ground those wishing to visit may have a relatively easy route to the hill’s high point.

The name of the hill is Coed yr Artsh and its addition to 400m Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Coed yr Artsh

Summit Height:  443.5m

Summit Grid Reference:  SN 76472 76079

Bwlch Height:  422.0m

Bwlch Grid Reference:  SN 76593 76052

Drop:  21.5m


Therefore, the 443.5m LIDAR data produced for the summit position at SN 76472 76079 and the 422.0m LIDAR data produced for the bwlch position at SN 76593 76052 gives this hill 21.5m of drop which is sufficient for its inclusion as a 400m Sub-Pedwar.


The full details for the hill are:

Cardinal Hill:  Pen y Garn

Summit Height:  443.5m (LIDAR data)

Name:  Coed yr Artsh

OS 1:50,000 map:  135, 147

Summit Grid Reference:  SN 76472 76079

Drop:  21.5m (LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 220 with 25 hills being added and 18 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Bryn yr Ysbyty (SN 985 995) – 400m Sub-Pedwar addition (50th reclassification)


There has been an addition to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being added to the 400m Sub-Pedwar category.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was originally catalogued with c 20m of drop which would have qualified it for 400m Sub-Pedwar status, this was re-evaluated and in doing so contours were misinterpolated, resulting in the hill being catalogued with c 14m of drop and therefore it was not considered for inclusion in the 400m Sub-Pedwar category.

The hill is situated in the Carnedd Wen range with its Cardinal Hill being Garreg Hir (SN 998 979) and is placed in the Region of North Wales (Region A, Sub-Region A4), and is positioned with the small community of Carno to the south-west and Clatter to the south south-east.

The hill is a part of designated open access land and although it is immersed in conifer plantation, a track enters the forest from east of the summit and gives access to a forest ride which ploughs its way through the conifers and comes relatively close to the high point, and dependent upon tree proximity any onward progress from here may prove problematic.

The name of the hill is Bryn yr Ysbyty and its addition to 400m Sub-Pedwar status is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Bryn yr Ysbyty

Summit Height:  435.2m

Summit Grid Reference:  SN 98523 99527

Bwlch Height:  413.3m

Bwlch Grid Reference:  SN 99024 99915

Drop:  21.9m


Therefore, the 435.2m LIDAR data produced for the summit position at SN 98523 99527 and the 413.3m LIDAR data produced for the bwlch position at SN 99024 99915 gives this hill 21.9m of drop which is sufficient for its inclusion as a 400m Sub-Pedwar.


The full details for the hill are:

Cardinal Hill:  Garreg Hir

Summit Height:  435.2m (LIDAR data)

Name:  Bryn yr Ysbyty

OS 1:50,000 map:  136

Summit Grid Reference:  SN 98523 99527

Drop:  21.9m (LIDAR data)


The total for Y Pedwarau remains at 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 219 with 24 hills being added and 18 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Fuches (SN 866 836) – Pedwar reclassified to 400m Sub-Pedwar (49th reclassification)


There has been a reclassification to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being reclassified from a Pedwar to a 400m Sub-Pedwar.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was listed with c 76m of drop based on an estimated summit height of c 453m and an estimated bwlch height of c 377m with the latter based on interpolation of bwlch contouring between 370m – 380m.  The reclassification of this hill is dependent upon the analysis of LIDAR data for it, and its adjacent east south-easterly hill of Allt y Derw (SN 873 834), with the height of the highest hill swapping, with this affecting the position of the critical bwlch of both hills and the status of Fuches.

The hill is situated in the Pumlumon range with its Cardinal Hill being Pumlumon Fawr (SN 789 869) and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is positioned with the small community of Llangurig to the south-east of the hill.

The hill is a part of designated open access land and although it is immersed in conifer plantation, a forest ride crosses the summit ridge in a north-east to south-west direction which gives relatively easy access to its high point.

The name of the hill is Fuches and its reclassification from Pedwar to a 400m Sub-Pedwar is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Fuches

Summit Height:  446.7m

Summit Grid Reference:  SN 86610 83643

Bwlch Height:  419.2m

Bwlch Grid Reference:  SN 87000 83839

Drop:  27.5m


Therefore, the 446.7m LIDAR data produced for the summit position at SN 86610 83643 and the 419.2m LIDAR data produced for the bwlch position at SN 87000 83839 gives this hill 27.5m of drop which is insufficient for its retention as a Pedwar.


The full details for the hill are:

Cardinal Hill:  Pumlumon Fawr

Summit Height:  446.7m (LIDAR data)

Name:  Fuches

OS 1:50,000 map:  135, 136

Summit Grid Reference:  SN 86610 83643

Drop:  27.5m (LIDAR data)


This reclassification now brings the total for Y Pedwarau to 442 hills with nine additions, and fourteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 218 with 23 hills being added and 18 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Bryn Crugog (SN 941 923) – 400m Sub-Pedwar reclassified to Pedwar (48th reclassification)


There has been a reclassification to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being reclassified from a 400m Sub-Pedwar to a Pedwar.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was listed with c 20m of drop based on the 447m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and an estimated bwlch height of c 427m based on interpolation of bwlch contouring between 420m – 430m.  The reclassification of this hill is dependent upon the analysis of LIDAR data for it, and its adjacent north-westerly hill of Esgair Hir (SN 937 925), with the height of the highest hill swapping, with this affecting the position of the critical bwlch of both hills and their status.  The Hill Reclassifications post for Esgair Hir will appear separately.

The hill is situated in the Pumlumon range with its Cardinal Hill being Bryn Amlwg (SN 921 973) and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is positioned with the small community of Llawr-y-glyn to the south-west.

As the summit is not a part of designated open access land permission to visit should be sought, however there is a public footpath that approaches from the east and heads just south of the high point of the hill.

The name of the hill is Bryn Crugog and its reclassification from 400m Sub-Pedwar to Pedwar is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Bryn Crugog

Summit Height:  446.7m

Summit Grid Reference:  SN 94130 92357

Bwlch Height:  394.0m

Bwlch Grid Reference:  SN 93183 93473

Drop:  52.7m


Therefore, the 446.7m LIDAR data produced for the summit position at SN 94130 92357 and the 394.0m LIDAR data produced for the bwlch position at SN 93183 93473 gives this hill 52.7m of drop which is sufficient for its reclassification to a Pedwar.


The full details for the hill are:

Cardinal Hill:  Bryn Amlwg

Summit Height:  446.7m (LIDAR data)

Name:  Bryn Crugog

OS 1:50,000 map:  136

Summit Grid Reference:  SN 94130 92357

Drop:  52.7m (LIDAR data)


This reclassification now brings the total for Y Pedwarau to 443 hills with nine additions, and thirteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 217 with 22 hills being added and 18 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Esgair Hir (SN 937 925) – Pedwar reclassified to 400m Sub-Pedwar (47th reclassification)


There has been a reclassification to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being reclassified from a Pedwar to a 400m Sub-Pedwar.  The criteria for 400m Sub-Pedwar qualification is all Welsh hills at or above 400m and below 500m in height with 20m or more and below 30m of drop.

Prior to analysis of LIDAR data the hill was listed with c 51m of drop based on the 448m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated bwlch height of c 397m based on interpolation of bwlch contouring between 390m – 400m.  The reclassification of this hill is dependent upon the analysis of LIDAR data for it, and its adjacent south-easterly hill of Bryn Crugog (SN 941 923), with the height of the highest hill swapping, with this affecting the critical bwlch of both hills and their status.  The Hill Reclassifications post for Bryn Crugog will appear separately.

The hill is situated in the Pumlumon range with its Cardinal Hill being Bryn Amlwg (SN 921 973) and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2), and is positioned with the small community of Llawr-y-glyn towards its south-west.

As the summit is not a part of designated open access land permission to visit should be sought, however there are a number of public footpaths that approach the summit from the south, north and the east, all meeting just west of the high point of the hill.

The name of the hill is Esgair Hir and its reclassification from Pedwar to 400m Sub-Pedwar is due to the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives the hill the following details:


Esgair Hir

Summit Height:  446.5m

Summit Grid Reference:  SN 93723 92558

Bwlch Height:  423.7m

Bwlch Grid Reference:  SN 94106 92683

Drop:  22.8m


Therefore, the 446.5m LIDAR data produced for the summit position at SN 93723 92558 and the 423.7m LIDAR data produced for the bwlch position at SN 94106 92683 gives this hill 22.8m of drop which is insufficient for its continued inclusion as a Pedwar.


The full details for the hill are:

Cardinal Hill:  Bryn Amlwg

Summit Height:  446.5m (LIDAR data)

Name:  Esgair Hir

OS 1:50,000 map:  136

Summit Grid Reference:  SN 93723 92558

Drop:  22.8m (LIDAR data)


This reclassification now brings the total for Y Pedwarau to 442 hills with eight additions, and thirteen reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The overall total for the 400m Sub-Pedwarau is now 218 with 22 hills being added and 17 hills being taken out of this category since publication of the list by Europeaklist in May 2013.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (June 2017)






Mapping Mountains - Hill Reclassifications - Y Pedwarau

Allt y Genlli (SN 985 950) – 390m Double Sub-Pedwar reclassified to 390m Sub-Pedwar (46th reclassification)


There has been a reclassification to the listing of Y Pedwarau due to analysis of LIDAR data by Aled Williams.  Y Pedwarau is the title for the list of 400m hills of Wales and takes in all Welsh hills at or above 400m and below 500m in height that have a minimum 30m of drop, the list is a joint compilation between Myrddyn Phillips and Aled Williams and it commenced publication on Mapping Mountains on the 30.01.17.

Accompanying the main Y Pedwarau list are five categories of sub hills, with this hill being reclassified from a 390m Double Sub-Pedwar to a 390m Sub-Pedwar.  The criteria for 390m Double Sub-Pedwar status being  all Welsh hills at or above 390m and below 400m in height with 20m or more and below 30m of drop, with the criteria for 390m Sub-Pedwar status being all Welsh hills at or above 390m and below 400m in height that have a minimum 30m of drop.

Prior to analysis of LIDAR data the hill was listed as a 390m Double Sub-Pedwar and its reclassification is dependent upon the LIDAR data analysis of it, and its southerly adjacent hill of Mynydd Garth Pwt, because of this the previously listed details of both hills based on map data are given below:



Allt y Genlli (previously listed as 390m Double Sub-Pedwar)

Summit Height:  394m (OS 1:25,000 Explorer map)

Summit Grid Reference:  SN 985 950

Bwlch Height:  367m (OS enlarged mapping hosted on the Geograph website)

Bwlch Grid Reference:  SN 983 944

Drop:  27m




Mynydd Garth Pwt (listed as 390m Sub-Pedwar)

Summit Height:  397m (OS 1:50,000 Landranger and 1:25,000 Explorer maps)

Summit Grid Reference:  SN 981 941

Bwlch Height:  c 325m

Bwlch Grid Reference:  SN 973 941

Drop:  c 72m



The hill is a part of the Pumlumon range with its Cardinal Hill being Bryn Amlwg (SN 921 973) and is placed in the Region of Mid and West Wales (Region B, Sub-Region B2).  The hill is situated to the south of the A 470 and is positioned between the small communities of Carno to its west north-west and Clatter to its east. 

Although the whole upper part of the hill is a part of designated open access land it is also immersed in conifer plantation.  The summit of the hill is encircled by a forest track and for those determined souls who wish to visit; an approach from the north using this track may be the best option, however only an on-site visit could determine how problematic an ascent could be.

The name of the hill is Allt y Genlli and its reclassification from 390m Double Sub-Pedwar to 390m Sub-Pedwar status is dependent upon its adjacent southerly hill of Mynydd Garth Pwt and the analysis of LIDAR data by Aled Williams.  LIDAR (Light Detection & Ranging) is highly accurate height data that is now freely available for much of England and Wales.

Aled’s analysis of LIDAR data gives these two hills the following details:


Allt y Genlli

Summit Height:  398.9m

Summit Grid Reference:  SN 98508 95042

Bwlch Height:  325.7m

Bwlch Grid Reference:  SN 97387 94159

Drop:  73.2m




Mynydd Garth Pwt

Summit Height:  397.8m

Summit Grid Reference:  SN 98154 94173

Bwlch Height:  367.3m

Bwlch Grid Reference:  SN 98385 94438

Drop:  30.5m


Therefore, as the 398.9m LIDAR data produced for the summit position of Allt y Genlli at SN 98508 95042 is higher than the 397.8m LIDAR data produced for the summit position of Mynydd Garth Pwt at SN 98154 94173, the lower bwlch is the critical bwlch for the higher of the two hills, therefore the listed bwlch position of each hill is swapped.


The full details for the two hills are:


Cardinal Hill:  Bryn Amlwg

Summit Height:  398.9m (LIDAR data)

Name:  Allt y Genlli

OS 1:50,000 map:  136

Summit Grid Reference:  SN 98508 95042
  
Drop:  73.2m (LIDAR data)




Cardinal Hill:  Bryn Amlwg

Summit Height:  397.8m (LIDAR data)

Name:  Mynydd Garth Pwt

OS 1:50,000 map:  136

Summit Grid Reference:  SN 98154 94173 
Drop:  30.5m (LIDAR data)



The total for Y Pedwarau remains at 443 hills with eight additions, and twelve reclassifications to 400m Sub-Pedwar status since publication of the list by Europeaklist in May 2013.

The total for the 390m Double Sub-Pedwarau decreases by one to 25 hills and the total for the 390m Sub-Pedwarau increases by one to 38 hills.

The list of Pedwar hills is available from the Haroldstreet website (January 2014) with all subsequent changes detailed on the Mapping Mountains site, with the list also having commenced publication on Mapping Mountains on the 30.01.17.

For the additions, reclassifications and deletions to Y Pedwarau reported on Mapping Mountains since the May 2013 publication of the list by Europeaklist please consult the following Change Registers:










Myrddyn Phillips and Aled Williams (May 2017)


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