Friday, 23 October 2020

Mapping Mountains – Hill Reclassifications – Y Trichant – The 300m Hills of Wales


Coed y Fedw (SJ 201 613) – Sub-Trichant addition

There has been an addition to the list of Y Trichant – The 300m Hills of Wales, 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.

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

Y Trichant – The 300m Hills of Wales – Welsh hills at or above 300m and below 400m in height that have 30m minimum drop, with an accompanying sub list entitled the Sub-Trichant with the criteria for this sub category being all Welsh hills at or above 300m and below 400m in height with 20m or more and below 30m of drop.  The list is authored by Myrddyn Phillips, with the Introduction to the list and the renaming of it appearing on Mapping Mountains on the 13th May 2017.

Y Trichant - The 300m Hills of Wales by Myrddyn Phillips

The name the hill is listed by is Coed y Fedw, and it is adjoined to the Moel y Gamelin group of hills, which are situated in the north-eastern part of North Wales (Region A, Sub-Region A2), and it is positioned with the A494 road to its north-west and minor roads to its south and east, and has the village of Gwernymynydd towards the north-east.

When the original 300m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list that accompanied the main P30 list, as it was considered not to meet the criteria then used for this sub category. 

After the P30 lists were standardised, and interpolated heights and drop values also included, and the lists updated, this hill was listed with an estimated c 24m of drop based on an estimated c 317m summit height and an estimated c 293m bwlch height based on interpolated detail from the Ordnance Survey 1:25,000 Explorer map.

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

Since publication of these P30 lists on Geoff Crowder’s v-g.me website 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 mapping on the WalkLakes website, and it is this mapping that gives this hill a 318m summit spot height.

Extract from the WalkLakes website

The details for this hill were also re-assessed against the mapping on the OS Maps website.  This is the replacement for OS Get-a-map and until recent times had contours at 5m intervals which were proving consistently more accurate compared to the 5m contours that sometimes appear on the Ordnance Survey 1:25,000 Explorer map and used to appear on the online Vector Map Local.  This resulted in its bwlch height being listed as c 294m based on interpolation of 5m contouring between 290m – 295m.

Therefore, the addition of this hill to Sub-Trichant status is due to detail on contemporary maps produced from Ordnance Survey data, resulting in a 318m summit height and a c 294m bwlch height, with these values giving this hill c 24m of drop, which is sufficient for it to be classified as a Sub-Trichant.


The full details for the hill are:

Group:  Moel y Gamelin

Name:  Coed y Fedw

OS 1:50,000 map:  117

Summit Height:  318m (spot height)

Summit Grid Reference:  SJ 20180 61372 (spot height)

Bwlch Height:  c 294m (interpolation)

Bwlch Grid Reference:  SJ 20367 61266 (interpolation)

Drop:  c 24m (spot height summit and interpolated bwlch)


Myrddyn Phillips (October 2020)









Thursday, 22 October 2020

Mapping Mountains – Trimble Surveys – Pumlumon


11.07.20  Mynydd Derw Llwydion (SN 904 900)  

Mynydd Derw Llwydion (SN 904 900)

This hill is positioned close to Llyn Clewedog and the various pull-ins and picnic tables overlooking the lake were busting with life as I drove around it, it seemed the lifting of the 5-mile keep local restriction had encouraged many people to get out and especially so with the weekends weather forecast giving dry and sunny conditions throughout Wales.  I headed away from the picnickers and parked at the start of the track leading toward the single wind turbine atop this hill.

The track leading to the summit

It was 1.15pm as I parked my car and headed off with all necessary equipment up the track toward the single wind turbine on the summit of Mynydd Derw Llwydion.  I’d been this way before in April 2014 when on a walk from Llyn Clewedog to Staylittle visiting and surveying a number of hills on the way.  The point I’d surveyed for this hill’s summit is where the 387m spot height appears on the Ordnance Survey 1:25,000 Explorer map. 

The survey of this hill’s summit and bwlch resulted in it being promoted to P30 status.  However, since those days LIDAR is now available and this shows the summit of this hill is close to the single wind turbine and not where the spot height is positioned, so a re-visit was necessary.

LIDAR summit image of Mynydd Derw Llwydion

It was only a five minute stroll to the summit and by the time I arrived on the high pint a welcome breeze blew across the land.  After assessing the summit area I chose the spot for Trimble placement and once the 0.1m accuracy level was attained I pressed ‘Log’ and scampered off to wait for the allotted five minutes of data to be gathered and stored.

Gathering data at the summit of Mynydd Derw Llwydion

Reversing my inward route I was soon back at my car, changed and away toward Llanidloes and a socially distanced visit to see Eryl and Rita for a couple of hours catch up sitting in the sun, a fine way to spend an afternoon.



Survey Result:


Mynydd Derw Llwydion  

Summit Height:  389.3m (converted to OSGM15) (significant height revision)

Summit Grid Reference:  SN 90460 90041 (summit relocation)

Bwlch Height:  358.1m (converted to OSGM15) (from previous Trimble GeoXH 6000 survey)

Bwlch Grid Reference:  SN 90391 90264 (from previous Trimble GeoXH 6000 survey)


Dominance:  8.03%











Wednesday, 21 October 2020

Change Register - The Deweys of England



Change Register

The 500-Metre Tops of England and Wales – the Deweys

The Deweys of England


In 1995 Constable published a book entitled Mountain tables authored by Michael Dewey.  The book documents a number of hill lists with this Change Register concentrating on one of these lists; The 500-Metre Tops of England and Wales, which for convenience has been split in to its component parts with the changes since first publication to the English 500-Metre Tops detailed below and their Welsh counterparts detailed in a separate Change Register, with the total for the Isle of Man 500-Metre Tops remaining unaltered.

The 500-Metre Tops of England and Wales is compiled by Michael Dewey and the list is now known affectionately after its compiler as the Deweys.  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.

When the list was first published it comprised 373 hills with 164 in England, 5 in the Isle of Man and 204 in Wales.  The Deweys have undergone extensive revision since first publication with over 90 reclassifications to the list (58 in Wales and 39 in England at the time of this Change Register publication).  Many people have contributed toward these, however there are only five people associated with ten or more reclassifications; Myrddyn Phillips, David Purchase, Rob Woodall, John Barnard and Graham Jackson.

For hill baggers who visit the Welsh hills the Deweys form an important part of their hill walking, as many baggers natural instinct is to visit the higher 2000ft hills first; these take in the category of Hewitts (P30) and Nuttalls (P15), but after completion of one if not both of these lists, what comes next; the natural progression is the Deweys.

For those people who have completed an ascent of each listed hill they would have visited all summits in England at and above 500m and below 2000ft (609.6m) in height that have a minimum drop of 30m on all sides.  These hills take in the majority of upland areas in England from the wilderness of the Cheviot in the north, to the openness of the Pennines and the compact beauty of the Lake District, to the Shropshire Hills and the rock tors of Dartmoor in the south.  Each and every hill can leave memories that refresh the soul and body, and for many it is the list of The 500-Metre Tops of England and Wales in the Mountain tables book that has taken them on a journey through some of the most beautiful landscape that Britain has to offer.

The majority of changes to this list took place in the years 2000 and 2001, with over 70 of the current 97 additions and deletions taking place during a 20 month period, and this was led by three main people; David Purchase, Myrddyn Phillips and Rob Woodall, who all worked closely together swapping information and co-ordinating this with Michael Dewey who instigated all necessary alterations.

Where more than one hill was added to the list on the same day these hills appear in the Change Register listed numerically, from highest to lowest in receding order justifying the latest changes always appearing toward the top of the Register.

Where the exact date of inclusion and / or deletion is not known and where these have involved a surveyed hill, the date of survey is given in the Change Register.  Where other exact dates of inclusion and / or deletion are not known a Pre date or month date is used.  

Since this lists’ first publication in 1995 the diligence of map study and the influx of independent surveyors have added and deleted a number of hills.  This Change Register endeavours to document these changes and give due accreditation to the people involved.

The Change Register to the Deweys of England since the 1995 Mountain tables publication appears below with the hills listed in receding order under the hill name used by Michael Dewey:



Change Register

The Deweys of England 








Calf Top    609.6m at SD 66450 85624 (Deleted from list:  September 2016)   

Calf Top (SD 664 856)

This hill was included in the Mountain tables book published by Constable in 1995, and listed with a 609m summit height which is adjoined to a triangulation pillar given the flush bracket height of 609.600m in the OS Trig Database and which appeared as a spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps of the day.  As its 609m summit spot height was near the benchmark height of 2000ft (609.6m) it was prioritised for a GNSS survey.  This hill was surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica 530 firstly on the 15th April 2010 when a two hour summit data set was gathered resulting in a 609.61m summit height, and secondly on the 20th May 201o when a four hour summit data set was gathered resulting in a 609.62m summit height.  These data were subsequently processed by Ordnance Survey using their Bernese software resulting in a 609.58m summit height, and confirming this hill as just under the 2,000ft (609.6m) benchmark height.  Or so we all thought!  The adoption of the new Ordnance Survey OSTN15 / OSGM15 model in 2016 elevated known heights of hills in England by an average of 2cm – 4cm, and in the case of Calf Top this resulted in its known accurate height increasing to 609.61m, and its subsequent reclassification from Dewey to Hewitt status.  English Dewey total decreases by one and confirmed as 181.





Beefstand Hill    562m at NT 82110 14369 (Added to list:  5th January 2015) 
 
The summit area of Beefstand Hill (NT 821 143).  Photo: John Kirk

This hill was originally included by Michael Dewey in his list of the The 500-Metre Tops of England and Wales in the Mountain tables book published by Constable in 1995, and subsequently deleted due to the proximity of its summit to the English – Scottish border, with John Barnard conducting an Abney level survey in September 2010 and finding the high point of the hill just over a fence in what contemporary maps give as a part of Scotland, and these details were forwarded to Michael Dewy in October 2011.  The initial response from the list author was to retain this hill as it straddles the two countries, however after further lobbying the hill was deleted from the list.  Its re-instatement back to Dewey status by the list author was based on communication with John Kirk who petitioned for this hill to be accepted back in to the ranks of Deweys.  English Dewey total increases by one and confirmed as 182.





Thack Moor    609.65m at NY 61166 46278 (Deleted from list:  April 2013)    

Thack Moor (NY 611 462)

This hill was included in the Mountain tables book published by Constable in 1995, and listed with a 609m summit height which appeared as a spot height on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps of the day, with the triangulation pillar given the flush bracket height of 609.600m in the OS Trig Database.  As its 609m summit spot height was near the benchmark height of 2000ft (609.6m) it was prioritised for a GNSS survey.  This hill was surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica 530 and Leica GS15, firstly on the 22nd August 2012 when a two hour summit data set was gathered, and secondly on the 3rd March 2013 when a four hour summit data set was gathered.  Both data sets were subsequently processed by Ordnance Survey who confirmed that this hill is 609.65m high and therefore over 2,000ft (609.6m) in height.  The reclassification of Thack Moor from Dewey to Hewitt status was accepted by each hill list author; Michael Deweys and Alan Dawson respectively, in April 2013.  English Dewey total decreases by one and confirmed as 181.





Little Fell    559m at NY 76646 00997 (Deleted from list:  13th October 2012)    

This hill was deleted from Michael Dewey’s list of the The 500-Metre Tops of England and Wales due to a level and staff line survey and it is the date of the survey that is used as that for the deletion date.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 559m summit spot height and col contouring between 520m – 530m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey.  These details were noted by Rob Woodall and Myrddyn Phillips, with Rob assessing the hill’s qualification on site on the 14th November 2000, and once forwarded to the list author; Michael Dewey, it was included in the list on the 19th November 2000.  Since the inclusion of this hill in the Dewey list the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available Ordnance Survey maps and gave a 529m spot height on the area of this hill’s col, and when coupled with the 559m summit spot height these values gave this hill 30m of drop and seemingly confirmed its Dewey status.  As the drop value for this hill was near the minimum 30m qualifying mark, it was prioritised for a line survey which was conducted by John Barnard, Chris Crocker and Graham Jackson on the 12th and 13th October 2012, resulting in 28.8m of drop and this hill’s subsequent deletion from Dewey status.  English Dewey total decreases by one and confirmed as 182.





Watch Hill    603m at NY 62495 46038 (Deleted from list:  October 2012) 

Watch Hill (NY 624 460)

This hill was deleted from Michael Dewey’s list of the The 500-Metre Tops of England and Wales due to a level and staff line survey.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 602m summit spot height and col contouring between 570m – 580m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey.  The above detail was noted by David Purchase who assessed the hill’s qualification on site.  These details were forwarded to the list author; Michael Dewey and the hill was added to the list on the 28th July 2001.  Since the inclusion of this hill in the Dewey list the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available Ordnance Survey maps and gave a 574m spot height on the area of this hill’s col, and when coupled with the 602m summit spot height these values gave this hill 29m of drop.  As the drop value for this hill was near the minimum 30m qualifying mark, it was prioritised for a line survey which was conducted by John Barnard, Graham Jackson and Myrddyn Phillips on the 22nd August 2012, resulting in 29.0m of drop and this hill’s subsequent deletion from Dewey status.  English Dewey total decreases by one and confirmed as 183.





Girdle Fell    536m at NY 69767 01768 (Deleted from list:  21st August 2012)    

This hill was deleted from Michael Dewey’s list of the The 500-Metre Tops of England and Wales due to map study conducted by Jim Bloomer.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 536m summit spot height adjoined to a triangulation pillar and col contouring between 500m – 510m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list on the 28th July 2001.  Its subsequent deletion is due to a 509m spot height that appeared on the col area of this hill on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.  English Dewey total decreases by one and confirmed as 184.





Beefstand Hill    562m at NT 82110 14369 (Deleted from list:  6th October 2011)

THIS HILL HAS SUBSEQUENTLY BEEN REINSTATED TO THE DEWEY LIST  
 
The summit area of Beefstand Hill (NT 821 143).  Photo: John Kirk

This hill was deleted from Michael Dewey’s list of the The 500-Metre Tops of England and Wales due to a survey with an Abney level for summit position.  This hill was included in the Mountain tables book published by Constable in 1995, and was listed with a 562m summit height and later with a drop value of 70m based on a 492m col spot height, both of which appear on the Ordnance Survey 1:25,000 Explorer map.  This hill was deleted due to the proximity of its summit to the English – Scottish border, with John Barnard conducting an Abney level survey in September 2010 finding the high point of the hill just over a fence in what contemporary maps give as a part of Scotland, these details were forwarded to Michael Dewy in October 2011.  The initial response from the list author was to retain this hill as it straddles the two countries, however after further lobbying the hill was deleted from the list.  English Dewey total decreases by one and confirmed as 185.





Kirkby Fell    546.45m at SD 87381 63531 (Added to list:  10th April 2011) 

The summit of Kirkby Fell (SD 873 635) L-R Brent Lynam, Mark Trengove, John Barnard and Graham Jackson

This hill was added to Michael Dewey’s list of the The 500-Metre Tops of England and Wales due to a survey with a Leica 530, and it is the date of the survey that is used as that for the inclusion date.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 546m summit spot height and col contouring between 510m – 520m that appear on the Ordnance Survey 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  The above detail was noted by Myrddyn Phillips, but the hill at this stage was not elevated to the ranks of Deweys.  As the interpolated drop value of this hill was close to the minimum qualifying mark of 30m it was prioritised for a GNSS survey, and this took place on the 10th April 2011.  The summit and col of this hill were surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica 530, with assistance from Brent Lynam and Mark Trengove, resulting in a 546.45m summit height and a 515.3m col height, with these values giving this hill 31.15m of drop, and once the list author; Michael Dewey, was informed it was added to his list.  The hill was later analysed via LIDAR by Myrddyn Phillips resulting in a 546.35m summit height and a 515.4m col height, with the latter positioned 54 metres from the col position ascertained during the GNSS survey.  English Dewey total increases by one and confirmed as 186.





Hand Lake    499.7m at NY 64726 00610 (Deleted from list:  24th November 2010) 

The Leica 530 gathering data at the summit of Hand Lake (NY 647 006)

This hill was deleted from Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales due to a survey with a Leica 530 and it is the date of the survey that is used as that for the deletion date.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a small uppermost 500m ring contour and col contouring between 450m – 460m that appear on the Ordnance Survey 1:25,000 Explorer map of the day, this hill was just over 500m in height and had a minimum of 30m of drop and was an automatic entry to list of Deweys.  These details were noted by E D ‘Clem’ Clements and once forwarded to the list author; Michael Dewey, it was included in his list.  As the listed summit height was the minimum required for qualification to Dewey status this hill was prioritised for a GNSS survey and this took place on the 24th November 2010.  The summit of this hill was surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica 530 resulting in a 499.7m summit height and as this is below the minimum 500m qualifying height the hill was subsequently deleted from the list of Deweys.  The hill was later analysed via LIDAR by Myrddyn Phillips resulting in the summit height and position matching that produced by the Leica 530 and a 458.9m col height, with these values confirming the drop of this hill as 40.8m.  English Dewey total decreases by one and confirmed as 185.





Linghaw    498.9m at SD 63763 98545 (Deleted from list:  20th October 2010) 

Gathering data at the summit of Linghaw (SD 637 985)

This hill was deleted from Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales due to a survey with a Leica 530 and it is the date of the survey that is used as that for the deletion date.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a small uppermost 500m ring contour and col contouring between 460m – 470m on the Ordnance Survey 1:25,000 Explorer map of the day, this hill was just over 500m in height and had a minimum of 30m of drop and was an automatic entry to the Dewey list.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data and once these details were forwarded to the list author; Michael Dewey, it was one of sixteen (thirteen in Wales and three in England) hills added to the list on the 3rd May 2000.  As the listed summit height was the minimum required for qualification to Dewey status this hill was prioritised for a GNSS survey and this took place on the 20th October 2010.  The summit and col of this hill were surveyed by John Barnard, Graham Jackson and Myrddyn Phillips using a Leica 530 resulting in a 498.9m summit height and a 463.45m col height, with these values giving this hill 35.4m of drop.  As the summit height is below 500m this hill was deleted from the list of Deweys.  English Dewey total decreases by one and confirmed as 186.





Axe Edge    549m at SK 03244 69290 (Deleted from list:  9th May 2008)

This hill was deleted from Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales and it is the date of the survey that is used as that for the deletion date.  This hill was included in the Mountain tables book published by Constable in 1995, but with a 549m summit spot height and col contours between 520m – 525m that appear on the Ordnance Survey 1:25,000 Outdoor Leisure map of the day, its inclusion was always dubious.  Its deletion from this list is due to a level and staff line survey conducted by John Barnard and Graham Jackson resulting in 26.6m of drop.  Once these details were forwarded to the list author; Michael Dewey, it was deleted from his list.  English Dewey total decreases by one and confirmed as 187.





Great Yarlside    597m at NY 52045 07956 (Deleted from list:  30th September 2007)

This hill was deleted from Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales and it is the date of the survey that is used as that for the deletion date.  This hill was not included in the Mountain tables book published by Constable in 1995, but was then added to the list (see below) on the 31st July 2005.  Its deletion from this list is due to a level and staff line survey conducted by John Barnard and Graham Jackson resulting in 28.1m of drop, with the 597m summit height relative to the height of a circular trig station positioned on the summit area of the hill.  Once these details were forwarded to the list author; Michael Dewey, it was deleted from his list.  English Dewey total decreases by one and confirmed as 188.





Birks Fell    610.3m at SD 91879 76371 (Deleted from list:  3rd June 2006)        

LIDAR image of Birks Fell (SD 918 763)

This was the only change to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales during the whole of 2006.  This hill was not included in the Mountain tables book published by Constable in 1995, but was then added to the list (see below) on the 28th July 2001 based on it not being included at the time in the 2000ft (609.6m) hill lists of Nuttalls (P15) and Hewitts (P30); conversely it should then be included as a Dewey.  This hill had been proposed for inclusion as a Hewitt by several people, most notably John Barnard and Graham Jackson who on the 3rd June 2006 used an automatic level in calculating the height of this hill.  The Ordnance Survey subsequently confirmed its height as being over 609.6m and once these details were forwarded to the list author; Michael Dewey, it was deleted from his list.  The hill was subsequently analysed via LIDAR by Myrddyn Phillips resulting in a 610.3m summit height and a 452.2m col height, with these values giving this hill 158.1m of drop.  English Dewey total decreases by one and confirmed as 189.






Great Yarlside    598m at NY 52045 07956 (Added to list:  31st July 2005) 

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

This hill was one of three additions (two in Wales and one in England) to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales due to hand-help GPS readings taken by Stephen Walker, with all three additions subsequently deleted due to accurate surveying, and it was added to the list on the 31st July 2005.  This hill was not included in the Mountain tables book published by Constable in 1995, and it has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 190.






Hand Lake    c 500m at NY 64726 00610 (Added to list:  8th November 2001)           

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

LIDAR image of Hand Lake (NY 647 006)

This hill was added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 8th November 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a tiny 500m uppermost summit contour and col contouring between 450m – 460m that appeared on the Ordnance Survey 1:25,000 Explorer map, this hill was an automatic entry to the listing of Deweys.  These details were noted by E D ‘Clem’ Clements, and once forwarded to the list author; Michael Dewey, it was included in his list.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 189.






Birnie Brae    508m at NT 87163 20684 (Added to list:  28th July 2001)         

This hill was one of eleven (nine in England and two in Wales) added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 508m summit spot height and col contouring between 470m – 480m that appear on the Ordnance Survey 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  Since the inclusion of this hill in the Dewey list the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map became available online.  This mapping had many spot heights not on other publicly available Ordnance Survey maps and gave a 477m col spot height for this hill, and when coupled with the 508m summit spot height, these values give this hill 31m of drop.  English Dewey total increases by one and confirmed as 188.






Beardown Tors    512.4m at SX 60285 77312 (Added to list:  28th July 2001)       

LIDAR image of Beardown Tors (SX 602 773)

This was one of eleven hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 513m summit spot height and col contouring between 480m – 490m that appear on the Ordnance Survey 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey as the 0pposing 480m ring contours are relatively close together.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 512.4m summit height and a 480.9m col height, with these values giving this hill 31.6m of drop and therefore confirming its Dewey status.  English Dewey total increases by one and confirmed as 187.






Seat Robert    515m at NY 52642 11404 (Added to list:  28th July 2001)        

This was one of eleven hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 515m summit spot height and col contouring between 480m – 490m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 186.






Steeperton Tor    533.1m at SX 61846 88718 (Added to list:  28th July 2001)      

LIDAR image of Steeperton Top (SX 618 887)

This was one of eleven hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 532m summit spot height and col contouring between 500m – 510m that appear on the Ordnance Survey 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey as the 0pposing 500m ring contours are close together.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 533.1m summit height and 500.9m col height, with these values giving this hill 32.2m of drop, confirming its Dewey status.  English Dewey total increases by one and confirmed as 185.






Girdle Fell    536m at NY 69767 01768 (Added to list:  28th July 2001)    

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

This was one of eleven hills added on the 28th July 2001 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 536m summit spot height adjoined to a triangulation pillar and col contouring between 500m – 510m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 184.






Bell Crags    559.1m at NY 29829 14303 (Added to list:  28th July 2001)    

This was one of eleven hills added on the 28th July 2001 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 558m summit spot height and col contouring between 520m – 530m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  The hill was later surveyed by John Barnard and Graham Jackson on the 30th January 2010 using a Leica 530 GNSS receiver, resulting in a 559.1m summit height and a 526.7m col height, with these values giving this hill 32.4m of drop, and confirming its Dewey status.  English Dewey total increases by one and confirmed as 183.






Black Crags    588m at NY 25545 08081 (Added to list:  28th July 2001)    

LIDAR col image of Black Crags (NY 255 080)

This was one of eleven hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 588m summit spot height and col contouring between 550m – 560m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  The col height for this hill was subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 556.3m col height, with this value giving this hill 32m of drop.  English Dewey total increases by one and confirmed as 182.






Watch Hill    602m at NY 62495 46038 (Added to list:  28th July 2001) 

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

Watch Hill (NY 624 460)

This was one of eleven hills added on the 28th July 2001 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 602m summit spot height and col contouring between 570m – 580m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey.  These details were noted by David Purchase who assessed the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 181.






Birks Fell    609m at SD 919 761 (Added to list:  28th July 2001)        

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

LIDAR summit image of Birks Fell

This was one of eleven hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 28th July 2001.  This hill was not included in the Mountain tables book published by Constable in 1995, but as it was not included at the time in the 2000ft (609.6m) hill lists of Nuttalls (P15) and Hewitts (P30) it was prudent that it should be included as a Dewey.  However, it did possess a 610m summit spot height on the Ordnance Survey 1:50,000 Landranger map.  These details were noted by David Purchase and Myrddyn Phillips, with David assessing the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 180.






Park Fell    511m at NY 69723 45538 (Added to list:  19th November 2000)      

This was one of five hills (all in England) added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 19th November 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 511m summit spot height and col contouring between 470m – 480m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the map details give this hill as an automatic entry to the list of Deweys.  These details were noted by Rob Woodall who also assessed the hill’s qualification on site on the 14th November 2000, once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 179.






Meal Fell    550m at NY 28301 33763 (Added to list:  19th November 2000)    

This was one of five hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 19th November 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 550m summit spot height and col contouring between 520m – 530m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey as the 0pposing 520m ring contours are extremely close together.  These details were noted by Rob Woodall and Myrddyn Phillips, with Rob assessing the hill’s qualification on site on the 14th November 2000, and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 178.






Little Fell    559m at NY 76646 00997 (Added to list:  19th November 2000) 

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

This was one of five hills added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 19th November 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 559m summit spot height and col contouring between 520m – 530m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be considered a potential new Dewey.  These details were noted by Rob Woodall and Myrddyn Phillips, with Rob assessing the hill’s qualification on site on the 14th November 2000, and once forwarded to the list author; Michael Dewey, it was included in his list.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 177.






Oxnop Common    584m at SD 92461 94705 (Added to list:  19th November 2000) 

This was one of five hills added on the 19th November 2000 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 584m summit spot height and col contouring between 550m – 560m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by Rob Woodall and Myrddyn Phillips, with Rob having assessed the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 176.






Woldside    595.3m at SD 87423 83003 and SD 87437 83001 (Added to list:  19th November 2000) 

LIDAR image of Woldside (SD 874 830)

This was one of five hills added on the 19th November 2000 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 596m summit spot height and col contouring between 560m – 570m that appear on the Ordnance Survey 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by Rob Woodall and Myrddyn Phillips, with Rob having assessed the hill’s qualification on site, and once forwarded to the list author; Michael Dewey, it was included in his list.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 595.3m summit height and 560.4m col height, with these values giving this hill 34.9m of drop, confirming its Dewey status.  English Dewey total increases by one and confirmed as 175.






Lowthwaite Fell    509m at NY 27835 34746 (Added to list:  7th August 2000)    

This hill was added to the The 500-Metre Tops of England and Wales list hosted on Michael Dewey’s website on the 7th August 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 509m summit spot height and col contouring between 470m – 480m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, the interpolated drop value was estimated sufficient for this hill to be a potential new Dewey.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data, and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 174.






St Raven’s Edge    593m at NY 40613 08381 (Added to list:  29th June 2000) 

This hill was added to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales on the 29th June 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 593m summit spot height and col contouring between 550m – 560m that appear on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, this hill has a minimum of 30m of drop according to contemporary Ordnance Survey maps and therefore was an automatic entry to the listing of Deweys.  These details were noted by Myrddyn Phillips and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 173.






Linghaw    c 500m at SD 63764 98540 (Added to list:  3rd May 2000)       

THIS HILL HAS SUBSEQUENTLY BEEN DELETED FROM THE DEWEY LIST 

The Leica 530 gathering data at the summit of Linghaw during the survey that subsequently deleted this hill from Dewey status

This hill was one of sixteen (thirteen in Wales and three in England) added to Michael Dewey’s online list of the The 500-Metre Tops of England and Wales on the 3rd May 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a small uppermost 500m ring contour and col contouring between 460m – 470m on the Ordnance Survey 1:25,000 Explorer map, according to contemporary Ordnance Survey maps this hill was just over 500m in height and had a minimum of 30m of drop and was an automatic entry to the Dewey list.  These details were noted by David Purchase and Myrddyn Phillips who worked independently but also exchanged all data and these details were forwarded to the list author; Michael Dewey.  This hill has subsequently been deleted from the Dewey list (see above).  English Dewey total increases by one and confirmed as 172.






Blaydike Moss    510.1m at SD 85261 77264 (Added to list:  3rd May 2000)     

LIDAR summit image of Blaydike Moss (SD 852 772)

This was one of sixteen hills added on the 3rd May 2000 to Michael Dewey’s online website list of the The 500-Metre Tops of England and Wales.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 510m summit spot height and col contouring between 470m – 480m that appear on the Ordnance Survey 1:25,000 Explorer map, this hill has a minimum of 30m of drop according to contemporary Ordnance Survey maps and therefore was an automatic entry to the Dewey list.  These details were noted by Myrddyn Phillips and once forwarded to the list author; Michael Dewey, it was included in his list.  The col height was later revised to 477m when the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map became available online.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 510.1m summit height and 476.6m col height, with these values giving this hill 33.5m of drop, confirming its Dewey status.  English Dewey total increases by one and confirmed as 171.






Brownley Hill    533m at NY 80228 50677 (Added to list:  3rd May 2000) 

Brownley Hill was one of sixteen hills added to the The 500-Metre Tops of England and Wales list on the 3rd May 2000, and which appeared in the list hosted on Michael Dewey’s website.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 533m summit spot height adjoined to a triangulation pillar and a 502m col spot height that appear on the Ordnance Survey 1:25,000 Explorer map, this hill has 31m of drop according to contemporary Ordnance Survey maps and therefore was an automatic entry to the Dewey list.  These details were noted by David Purchase and once forwarded to the list author; Michael Dewey, it was included in his list.  English Dewey total increases by one and confirmed as 170.






Ullister Hill    525m at NY 20945 26015 (Added to list:  1st May 2000)        

This hill was one of seven (four in England and three in Wales) that were added on the 1st May 2000 to the The 500-Metre Tops of England and Wales and appeared in the list hosted on Michael Dewey’s website, the addition of all seven hills are credited to David Purchase.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 525m summit spot height and col contouring between 490m – 500m on the Ordnance Survey 1:25,000 Explorer map, it was judged from contour interpolation to have sufficient drop to enter the list.  The col height was later revised to 491m when the Ordnance Survey Vector Map Local hosted on the Geograph website and which is entitled the Interactive Coverage Map became available online.  English Dewey total increases by one and confirmed as 169.






Green Crag    528m at NY 20247 13061 (Added to list:  1st May 2000)        

This hill was one of seven added to the listing of the The 500-Metre Tops of England and Wales on the 1st May 2000 and included in Michael Dewey’s list hosted on his website, the addition of all seven hills are credited to David Purchase.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 528m summit spot height and col contouring between 490m – 500m that appear on the Ordnance Survey 1:25,000 Explorer map, it was judged from contour interpolation to have sufficient drop to enter the list.  English Dewey total increases by one and confirmed as 168.






Horse Stone Naze    528.0m at SK 15815 97545 (Added to list:  1st May 2000)      

LIDAR summit image of Horse Stone Naze (SK 158 975)

This was one of seven hills added to the listing of the The 500-Metre Tops of England and Wales on the 1st May 2000 and included in Michael Dewey’s list hosted on his website, the addition of all seven hills are credited to David Purchase.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 527m summit spot height and col contouring between 490m – 500m that appear on the Ordnance Survey 1:25,000 Explorer map, it was judged from interpolation to have sufficient drop to enter the list.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 528.0m summit height and 493.1m col height, with these values giving this hill 34.9m of drop, confirming its Dewey status.  English Dewey total increases by one and confirmed as 167.






Seat    562.6m at NY 18557 13425 (Added to list:  1st May 2000)     

LIDAR image of Seat (NY 185 134)

This hill was one of seven that were added on the 1st May 2000 to the The 500-Metre Tops of England and Wales and appeared in the list hosted on Michael Dewey’s website, the addition of all seven hills are credited to David Purchase.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 561m summit spot height that appears on the Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map and col contouring between 530m – 540m that appears on the Ordnance Survey 1:25,000 Explorer map, it was judged from interpolation to have sufficient drop to enter the list.  The summit and col heights for this hill were subsequently ascertained from LIDAR analysis conducted by Myrddyn Phillips, resulting in a 562.6m summit height and a 531.0m col height, with these values giving this hill 31.6m of drop, confirming its Dewey status.  English Dewey total increases by one and confirmed as 166.






Combs Head    503m at SK 04064 75728 (Added to list:  Early April 2000) 

LIDAR col image for Combs Head (SK 040 757)

This hill was one of six that were added to the The 500-Metre Tops of England and Wales and appeared in the list hosted on Michael Dewey’s website, and which formed the first batch of additions to this list.  The exact date of inclusion is unknown; however these six additions were found by Rob Woodall and reported in a letter dated the 12th April 2000, with this hill’s inclusion likely to be early April 2000.  This hill was not included in the Mountain tables book published by Constable in 1995, but with a 503m summit spot height that appears on the Ordnance Survey 1:25,000 Explorer map and col contouring between 460m – 465m, according to contemporary map detail it was an automatic entry to the Dewey list.  The height of the col was subsequently calculated as 463.1m from LIDAR analysis conducted by Myrddyn Phillips.  English Dewey total increases by one and confirmed as 165.

 



1995 – Constable publishes Mountain tables with The 500-Metre Tops of England and Wales. 

English Dewey total confirmed as 164.