Mapping Mountains - Summit Relocations - 30-99m Twmpau
Hill Park (SM 955 102) - 30th summit relocation
Significant Name Changes post for Hill Park
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill prompted by detail produced by Joe Nuttall in his surface analysis programme, with subsequent LIDAR analysis conducted by the DoBIH team and independently by Myrddyn Phillips.
LIDAR image of Hill Park (SM 955 102) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Hill Park (SM 955 102) |
The full details for the hill are:
Group: Garn Fawr
Name: Hill Park
OS 1:50,000 map: 157, 158
Summit Height: 99.5m (LIDAR)
Summit Grid Reference (New Position): SM 95585 10244 (LIDAR)
Bwlch Height: 63.6m (LIDAR)
Bwlch Grid Reference: SM 93281 10622 (LIDAR)
Drop: 35.9m (LIDAR)
Dominance: 36.16% (LIDAR)
Myrddyn Phillips (January 2024)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Field (SN 068 063) - 29th summit relocation
Significant Name Changes post for Field
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from detail produced by Joe Nuttall in his surface analysis progamme, with subsequent LIDAR analysis conducted by the DoBIH team and independently by Myrddyn Phillips.
LIDAR image of Field (SN 068 063) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Field (SN 068 063) |
The highest remaining natural ground on Field (Photo: Google Street View) |
Therefore, the height produced by LIDAR analysis to the highest remaining natural ground on this hill is 90.1m and is positioned at SN 06845 06360, this position is not given a spot height on the contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer map, and is approximately 70 metres east south-eastward from where the originally listed summit was positioned and approximately 22 metres east south-eastward from where the high point of the raised hedge bank is positioned.
The full details for the hill are:
Group: Mynydd Preseli
Name: Field
OS 1:50,000 map: 158
Summit Height: 90.1m (LIDAR)
Summit Grid Reference (New Position): SN 06845 06360 (LIDAR)
Bwlch Height: 52.1m (LIDAR)
Bwlch Grid Reference: SN 08698 06251 & SN 08706 06253 & SN 08709 06255 (LIDAR)
Drop: 37.9m (LIDAR)
Dominance: 42.11% (LIDAR)
Myrddyn Phillips (August 2023)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Black Acre (SN 292 146) - 28th summit relocation
Significant Name Changes post for Black Acre
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Black Acre (SN 292 146) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Black Acre (SN 292 146) |
The full details for the hill are:
Group: Mynydd Pencarreg
Name: Black Acre
OS 1:50,000 map: 159
Summit Height: 61.3m (LIDAR)
Summit Grid Reference (New Position): SN 29283 14648 (LIDAR)
Bwlch Height: 29.6m (LIDAR)
Bwlch Grid Reference: SN 29308 15527 (LIDAR)
Drop: 31.8m (LIDAR)
Dominance: 51.80% (LIDAR)
Myrddyn Phillips (October 2022)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Ffynnon Ellis (SN 392 204) - 27th summit relocation
Significant Name Changes post for Ffynnon Ellis
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Ffynnon Ellis (SN 392 204) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Ffynnon Ellis (SN 392 204) |
The full details for the hill are:
Group: Mynydd Pencarreg
Name: Ffynnon Ellis
OS 1:50,000 map: 145, 159
Summit Height: 73.7m (LIDAR)
Summit Grid Reference (New Position): SN 39221 20463 (LIDAR)
Bwlch Height: 33.8m (LIDAR)
Bwlch Grid Reference: SN 39997 20345 (LIDAR)
Drop: 39.9m (LIDAR)
Dominance: 54.09% (LIDAR)
Myrddyn Phillips (September 2022)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Caer Lan (SN 314 179) - 26th summit relocation
Significant Name Changes post for Caer Lan
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Caer Lan (SN 314 179) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Caer Lan (SN 314 179) |
The full details for the hill are:
Group: Mynydd Pencarreg
Name: Caer Lan
OS 1:50,000 map: 159
Summit Height: 78.8m (LIDAR)
Summit Grid Reference (New Position): SN 31408 17941 (LIDAR)
Bwlch Height: 36.4m (LIDAR)
Bwlch Grid Reference: SN 30930 18268 (LIDAR)
Drop: 42.4m (LIDAR)
Dominance: 53.81% (LIDAR)
Myrddyn Phillips (September 2022)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Lan Uchaf (SN 526 230) - 25th summit relocation
Significant Name Changes post for Lan Uchaf
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Lan Uchaf (SN 526 230) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Lan Uchaf (SN 526 230) |
The full details for the hill are:
Group: Mynydd Mallaen
Name: Lan Uchaf
OS 1:50,000 map: 159
Summit Height: 86.7m (LIDAR)
Summit Grid Reference (New Position): SN 52675 23027 (LIDAR)
Bwlch Height: 39.0m (LIDAR)
Bwlch Grid Reference: SN 53053 23453 & SN 53053 23455 (LIDAR)
Drop: 47.7m (LIDAR)
Dominance: 55.02% (LIDAR)
Myrddyn Phillips (May 2022)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Pt. 86.4m (SH 482 875) - 24th summit relocation
Significant Name Changes post for Pt. 86.4m
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Pt. 86.4m (SH 482 875) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was included in the Hills to be surveyed sub list, and included as a twin topped hill with the prioritised summit given at SH 484 876 with an accompanying note stating; Two tops of same height – other at SH 482 874.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with 29m of drop, based on the twin 86m summit spot heights that appear on the Ordnance Survey 1:25,000 Explorer map and the 57m bwlch spot height that appeared on the Ordnance Survey Vector Map Local hosted on the Geograph website and which was entitled the Interactive Coverage Map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Pt. 86.4m (SH 482 875) |
The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, within a different map contour, to a different feature such as in a conifer plantation, to a different point where a number of potential summit positions are within close proximity, a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist, or when natural ground or the natural and intact summit is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct.
Therefore, the summit height produced by LIDAR analysis is 86.4m and this is positioned at SH 48231 87520, this position is given an 86m spot height on contemporary Ordnance Survey 1:25,000 Explorer maps, and is approximately 240 metres south-westward from where the previously listed priority summit is positioned.
The full details for the hill are:
Group: Ynys Môn
Name: Pt. 86.4m
OS 1:50,000 map: 114
Summit Height: 86.4m (LIDAR)
Summit Grid Reference (New Position): SH 48231 87520 (LIDAR)
Bwlch Height: 57.0m (LIDAR)
Bwlch Grid Reference: SH 47995 86997 (LIDAR)
Drop: 29.4m (LIDAR)
Myrddyn Phillips (September 2021)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Bwlch y Fen & Tyddyn Gwyn (SH 417 783) - 23rd summit relocation
Hill Reclassifications post for Bwlch y Fen & Tyddyn Gwyn
Significant Name Changes post for Bwlch y Fen & Tyddyn Gwyn
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from detail on contemporary maps produced from Ordnance Survey data and LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Bwlch y Fen & Tyddyn Gwyn (SH 417 783) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
When the original 30-99m 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, as it was considered not to meet the criteria then used for this sub category.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 21m of drop, based on the 89m summit spot height positioned at SH 41706 78330 that appears on the Ordnance Survey 1:25,000 Explorer map and an estimated c 68m bwlch height based on interpolation of 5m contouring between 65m – 70m.
Extract from the Ordnance Survey 1:25,000 Explorer map |
The height produced by LIDAR analysis for the remaining natural summit is 88.150m and is positioned at SH 41738 78329, with LIDAR analysis giving a raised field boundary positioned at SH 41714 78319 a height of 88.169m, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:
The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, within a different map contour, to a different feature such as in a conifer plantation, to a different point where a number of potential summit positions are within close proximity, a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist, or when natural ground or the natural and intact summit is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct.
LIDAR summit image of Bwlch y Fen & Tyddyn Gwyn |
The full details for the hill are:
Group: Ynys Môn
Name: Bwlch y Fen & Tyddyn Gwyn
OS 1:50,000 map: 114, 115
Summit Height: 88.15m (LIDAR)
Summit Grid Reference (New Position): SH 41738 78329 (LIDAR)
Bwlch Height: c 68m (interpolation)
Bwlch Grid Reference: SH 41140 80401 (interpolation)
Drop: c 20m (LIDAR summit and interpolated bwlch)
Myrddyn Phillips (September 2021)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Pen y Graig Wen (SH 446 879) - 22nd summit relocation
Hill Reclassification post for Pen y Graig Wen
Significant Height Revisions post for Pen y Graig Wen
Significant Name Changes post for Pen y Grain Wen
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Pen y Graig Wen (SH 446 879) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
When the original 30-99m 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, as it was considered not to meet the criteria then used for this sub category.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 24m of drop, based on an estimated c 92m summit height positioned at SH 44769 87804 and an estimated c 68m bwlch height, with both heights based on interpolation of 5m contouring that appears on the Ordnance Survey 1:25,000 Explorer map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
The summit height produced by LIDAR analysis is 94.3m and is positioned at SH 44637 87986, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:
The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, to a different feature such as in a conifer plantation, placed within a different map contour, to a different point where a number of potential summit positions are within close proximity, or when natural ground or the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist.
Therefore, the summit height produced by LIDAR analysis is 94.3m and this is positioned at SH 44637 87986, this position is not given a spot height on contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and is approximately 225 metres north-westward from where the previously listed summit is positioned.
The full details for the hill are:
Group: Ynys Môn
Name: Pen y Graig Wen
OS 1:50,000 map: 114
Summit Height: 94.3m (LIDAR)
Summit Grid Reference (New Position): SH 44637 87986 (LIDAR)
Bwlch Height: 68.2m (LIDAR)
Bwlch Grid Reference: SH 45162 88579 (LIDAR)
Drop: 26.1m (LIDAR)
Myrddyn Phillips (August 2021)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Tyddyn Gwydryn Llain Fan (SH 495 681) - 21st summit relocation
Hill Reclassifications post for Tyddyn Gwydryn Llain Fan
Significant Height Revisions post for Tyddyn Gwydryn Llain Fan
Significant Name Changes post for Tyddyn Gwydryn Llain Fan
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau, with the summit height, bwlch height and their locations, the drop and status of the hill derived from LIDAR analysis conducted by Myrddyn Phillips.
LIDAR image of Tyddyn Gwyfryn Llain Fan (SH 495 681) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
When the original 30-99m height band of Welsh P30hills were published on Geoff Crowder’s v-g.me website this hill was not included in the Hills to be surveyed sub list, as it was considered not to meet the criteria then used for this sub category.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 26m of drop based on the 59m spot height adjoined to a triangulation pillar positioned at SH 49980 68424 and the 59m spot height positioned at SH 50109 68526 and an estimated c 33m bwlch height based on interpolation of 5m contouring between 30m – 35m that appear on the Ordnance Survey 1:25,000 Explorer map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
The summit height produced by LIDAR analysis is 60.4m and is positioned at SH 49584 68102, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:
The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, to a different feature such as in a conifer plantation, placed within a different map contour, to a different point where a number of potential summit positions are within close proximity, or when natural ground or the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist.
Therefore, the summit height produced by LIDAR analysis is 60.4m and this is positioned at SH 49584 68102, this position is not given a spot height on contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and is approximately 400 metres south-westward from where the previously listed summit is positioned.
The full details for the hill are:
Group: Ynys Môn
Name: Tyddyn Gwydryn Llain Fan
OS 1:50,000 map: 114, 115
Summit Height: 60.4m (LIDAR)
Summit Grid Reference (New Position): SH 49584 68102 (LIDAR)
Bwlch Height: 31.9m (LIDAR)
Bwlch Grid Reference: SH 51324 71408 (LIDAR)
Drop: 28.5m (LIDAR)
Myrddyn Phillips (May 2021)
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Ynys Fach (SN 668 951) - 20th summit relocation
Hill Reclassifications post for Ynys Fach
Significant Height Revisions post for Ynys Fach
Significant Name Changes post for Ynys Fach
There has been a Summit Relocation to a hill that is listed in the 30-99m Twmpau and Y Trechol – The Dominant Hills of Wales, with the summit height, bwlch height and their locations, the drop, dominance and status of the hill derived by Joe Nuttall who produced a summit analysis programme using LIDAR, and then by LIDAR analysis initially conducted by Jim Bloomer and subsequently by Myrddyn Phillips.
LIDAR image of Ynys Fach (SN 668 951) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
When the original 30-99m height band of Welsh P30 hills were published on Geoff Crowder’s v-g.me website this hill was 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 in the main P30 category.
After the sub list was standardised, and interpolated heights and drop values also included the details for this hill were re-evaluated and it was listed with an estimated c 27m of drop based on an estimated c 34m summit height positioned at SN 670 948 and an estimated c 7m bwlch height, with both values based on interpolation of 10m contouring that appears on the Ordnance Survey 1:25,000 Explorer map, with 30m being the uppermost contour given the hill on this map.
Extract from the Ordnance Survey 1:25,000 Explorer map |
The summit height produced by LIDAR analysis is 43.5m and is positioned at SN 66845 95141, and this comes within the parameters of the Summit Relocations used within this page heading, these parameters are:
The term Summit Relocations applies when the hill’s high point is found to be positioned; in a different field, to a different feature such as in a conifer plantation, placed within a different map contour, to a different point where a number of potential summit positions are within close proximity, or when natural ground or the natural and intact summit of a hill is confirmed compared to a higher point such as a raised field boundary that is judged to be a relatively recent man-made construct, or a relocation of approximately 100 metres or more in distance from either the position of a map spot height or from where the summit of the hill was previously thought to exist.
Therefore, the summit height produced by LIDAR analysis is 43.5m and this is positioned at SN 66845 95141, this position is not given a spot height on contemporary Ordnance Survey 1:50,000 Landranger and 1:25,000 Explorer maps, and is approximately 300 metres north north-westward from where the previously listed summit is positioned.
The full details for the hill are:
Group: Pumlumon
Name: Ynys Fach
OS 1:50,000 map: 135
Summit Height: 43.5m (LIDAR)
Summit Grid Reference (New Position): SN 66845 95141 (LIDAR)
Bwlch Height: 2.1m (LIDAR)
Bwlch Grid Reference: SN 67483 95096 (LIDAR)
Drop: 41.3m (LIDAR)
Dominance: 95.10% (LIDAR)
Myrddyn Phillips (April 2021)
LIDAR image of Parkwall Hill (ST 499 906) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR image of Ifton Great Wood (ST 455 894) |
The 30-99m Twmpau by Myrddyn Phillips |
Y Trechol - The Dominant Hills of Wales by Myrddyn Phillips |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Ifton Great Wood |
Waltwood Hill (ST 386 885) - 17th summit relocation
Significant Height Revisions post for Waltwood Hill
LIDAR image of Waltwood Hill (ST 386 885) |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR summit image of Waltwood Hill |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Ynys Bery (SM 701 219) - 16th summit relocation
LIDAR image of Ynys Bery. 1m contour (black), 10m contour (red) and sea level (yellow) |
Extract from the Ordnance Survey 1:25,000 Explorer map |
Extract from the Ordnance Survey Vector Map Local hosted on the Geograph website |
Plas Gwyn (SH 524 817) - 15th summit relocation
Survey post for Plas Gwyn
Significant Name Changes post for Plas Gwyn
Plas Gwyn (SH 524 817) |
Extract from the Ordnance Survey Vector Map Local hosted on the Geograph website with the cursor indicating the position of the newly relocated summit |
LIDAR image of the summit of Plas Gwyn |
The Trimble GeoXH 6000 gathering data at the new summit position of Plas Gwyn |
The Trimble GeoXH 6000 gathering data at the old summit position of Plas Gwyn |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Yr Orsedd (SH 299 270) - 14th summit relocation
Survey post for Yr Orsedd
Hill Reclassifications post for Yr Orsedd
Significant Name Changes post for Yr Orsedd
Yr Orsedd (SH 299 270) |
Extract from the Ordnance Survey 1:25,000 Explorer map |
Bryn Tŷ Newydd (SH 295 265) |
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website |
The Trimble GeoXH 6000 gathering data at the summit of Yr Orsedd |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Penrhos Garnedd (SH 560 702) - 13th summit relocation
Survey post for Penrhos Garnedd
The summit of Penrhos Garnedd (SH 560 702) |
Extract from the Ordnance Survey 1:25,000 Explorer map |
LIDAR image of Penrhos Garnedd |
The Trimble GeoXH 6000 set-up position at the summit of Penrhos Garnedd |
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website with the circled position indicating the new summit position |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Bryn (SH 426 361) - 12th summit relocation
Survey post for Bryn
Hill Reclassifications post for Bryn
Significant Name Changes post for Bryn
LIDAR image of the summit of Bryn |
The Trimble GeoXH 6000 gathering data at the summit of Bryn |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Cae Ffwyn Uchaf (SN 588 005) - 11th summit relocation
Significant Name Changes post for Cae Ffwyn Uchaf
LIDAR image of Cae Ffwyn Uchaf |
Extract from the Ordnance Survey 1:50,000 Landranger map |
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website |
LIDAR image of the old listed summit position |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Pwlldu Head (SS 569 865) - 10th summit relocation
LIDAR image of Pwlldu Head |
LIDAR summit image of Pwlldu Head |
The Ordnance Survey Interactive Coverage Map hosted on the Geograph website showing the summit position in relation to where the trig pillar is positioned |
The full details for the hill are:
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Broughton Burrows (SS 413 927) - 9th summit relocation
Significant Height Revisions post for Broughton Burrows
LIDAR image of Broughton Burrows |
LIDAR image of Broughton Burrows showing the summit and connecting bwlch |
Close up LIDAR summit image of Broughton Burrows |
Extract from OS Maps |
The Ordnnance Survey Interactive Coverage map hosted on the Geograph website showing the summit position in relation to where the 49m spot height appears |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Park Quarry (SN 428 120) - 8th summit relocation
Significant Name Changes post for Park Quarry
LIDAR image of Park Quarry |
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website showing one of the two equal heighted LIDAR summit positions in relation to the position of the spot height |
LIDAR image for Park Quarry showing the natural summit left of centre and the high point of the raised hedge bank in the centre of the image |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Cae Benglog (SH 316 380) - 7th summit relocation
Hill Reclassfications post for Cae Benglog
Significant Name Changes post for Cae Benglog
Extract from the Ordnance Survey 1:25,000 Explorer map |
Extract from OS Maps |
LIDAR image of Cae Benglog |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Allt Fawr (SH 383 356) - 6th summit relocation
Hill Reclassifications post for Allt Fawr
Significant Height Revisions post for Allt Fawr
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website |
Extract from OS Maps |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Pt. 47.8m (SH 604 438) - 5th summit relocation
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website indicating the position of the LIDAR summit in relation to where the 46m spot height appears |
The uppermost 45m ring contour shown on the OS Maps website |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Bryn y Bont (SH 596 459) - 4th summit relocation
Hill Reclassifications post for Bryn y Bont
Significant Height Revisions post for Bryn y Bont
Extract from the Ordnance Survey 1:25,000 Explorer map |
Extract from the Ordnance Survey Interactive Coverage map hosted on the Geograph website indicating the position of the LIDAR summit in relation to the uppermost 20m ring contour |
The uppermost 25m ring contour shown on the OS Maps website |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Bryn y Gwynt (SH 599 449) - 3rd summit relocation
Hill Reclassifications post for Bryn y Gwynt
Significant Name Changes post for Bryn y Gwynt
Significant Height Revisions post for Bryn y Gwynt
LIDAR image of Bryn y Gwynt (SH 599 449) |
30-99m Twmpau - Welsh hills at or above 30m and below 100m in height with 30m minimum drop, with an accompanying sub list entitled the 30-99m Sub-Twmpau with the criteria for this sub category being all Welsh hills at or above 30m and below 100m in height with 20m or more and below 30m of drop, with the word Twmpau being an acronym standing for thirty welsh metre prominences and upward.
Y Trechol - The Dominant Hills of Wales - Welsh P30 hills whose prominence equal or exceed half that of their absolute height. With the criteria for Lesser Dominant status being those additional Welsh P30 hills whose prominence is between one third and half that of their absolute height, with the Introduction to the Mapping Mountains publication of this list appearing on the 3rd December 2015, and the list is now available in its entirety on Mapping Mountains in Google Doc format.
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website |
The Trimble GeoXH 6000 gathering data at the summit of Bryn y Gwynt |
Mapping Mountains - Summit Relocations - 30-99m Twmpau
Bryn Tŵr (SH 604 441) - 2nd summit relocation
Survey post for Bryn Tŵr
Significant Height Revisions post for Bryn Tŵr
Bryn Tŵr (SH 60453 44187) |
Extract from the Ordnance Survey Interactive Coverage Map hosted on the Geograph website |
The Trimble GeoXH 6000 gathering data at the summit of Bryn Tŵr |
Graig Wen (SH 397 947) - 1st summit relocation
Survey post for Graig Wen
There has been a Summit Relocation to the listing of 30-99m Twmpau (thirty welsh metre prominences and upward), with the hill also listed in Y Trechol - The Dominant Hills of Wales. This is the first post under this heading and the summit relocation was initiated by a survey with the Trimble GeoXH 6000 with the following details being retrospective as the Trimble survey that resulted in this summit relocation was conducted on 7th September 2014.
The survey was conducted in the north of Ynys Môn on a fine and bright day on a grouping of three excellent hills in the company of Alex Cameron, with the hill situated north-eastward of the small town of Cemaes, with the nearest major road to the hill being the A 5025 which is 1km directly south of its summit.
Dominance: 54.33% (Trimble GeoXH 6000 summit and LIDAR bwlch)
The Trimble GeoXH 6000 gathering data at the new summit position of Graig Wen, with the old position for the summit next to the hill's trig pillar in the background on the left of the photo |
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