Myrddyn Phillips - Mapping Mountains: New Welsh LIDAR - Welsh Highlands

Monday, 27 March 2023

New Welsh LIDAR - Welsh Highlands - Uchafion Cymru

The Welsh Highlands – Uchafion Cymru:

Update on Recent Status Changes

The release of new Welsh LIDAR has generated a number of status changes in the listing of the Welsh Highlands – Uchafion Cymru. Those subsequently confirmed by a Trimble GeoXH 6000 survey also appear below and are listed separately:

The Welsh Highlands Tops (≥P15)

Group	Name	Summit (m)	Summit GR	Bwlch (m)	Bwlch GR	Drop (m)	Change
Moel Hebog	Pt. 576.0m	576.0	SH 55928 47521	560.4	SH 55885 47595	15.6	Addition
Carnedd y Filiast	Llechwedd Du	511.4	SH 89360 44629	497.1	SH 89096 44273	14.3	Deletion
Craig Berwyn	Pt. 585.6m	585.6	SJ 13031 32635	571.5	SJ 12920 32539	14.2	Deletion
Y Garn	Cefn Blaen Merin	552.9	SN 81271 81064	538.1	SN 81424 81034	14.8	Deletion

The Welsh Highlands Sub-Tops (P10 to <P15)

Group	Name	Summit (m)	Summit GR	Bwlch (m)	Bwlch GR	Drop (m)	Change
Carnedd Llewelyn	Carnedd Fach	965.1	SH 65808 62620	956.2	SH 65840 62664	8.9	Deletion
Carnedd Llewelyn	Craig yr Ysfa	864.3	SH 69232 63638	855.0	SH 69193 63707	9.2	Deletion
Carnedd Llewelyn	Pen y Castell	621.1	SH 72434 68874	611.0	SH 72374 68895	10.1	Addition
Glyder Fawr	Pt. 872.5m	872.5	SH 65866 57758	863.9	SH 65874 57788	8.6	Deletion
Glyder Fawr	Elidir Fach	794.5	SH 60378 61339	784.7	SH 60556 61279	9.8	Deletion
Glyder Fawr	Yr Esgair	708.3	SH 62988 61307	702.0	SH 62967 61278	6.3	Deletion
Yr Wyddfa	Pt. 906.2m	906.2	SH 61982 55146	896.4	SH 61885 55154	9.8	Deletion
Yr Wyddfa	Pt. 563.3m	563.3	SH 63821 55162	553.2	SH 63750 55176	10.0	Addition
Moel Hebog	Moel yr Ogof	576.0	SH 55928 47521	560.4	SH 55885 47595	15.6	Deletion
Moel Siabod	Cefn y Cerrig	502.2	SH 67480 54510	491.3	SH 67511 54417	10.9	Addition
Moelwyn Mawr	Pt. 592.5m	592.5	SH 64805 47425	582.2	SH 64974 47586	10.3	Addition
Moelwyn Mawr	Pt. 571.3m	571.3	SH 66153 49880	560.9	SH 66223 49897	10.4	Addition
Moelwyn Mawr	Pt. 531.3m	531.3	SH 65884 46911	520.6	SH 65971 46821	10.6	Addition
Arenig Fawr	Pen Tyrau	697.8	SH 83744 38244	688.1	SH 83602 38147	9.7	Deletion
Arenig Fawr	Pt. 590.9m	590.9	SH 77617 24963	581.5	SH 77711 25065	9.5	Deletion
Arenig Fawr	Y Ddau Faen Llwyd	537.3	SH 80456 31074	527.6	SH 80534 31223	9.7	Deletion
Arenig Fawr	Graig Fach	511.3	SH 79263 24920	501.4	SH 79277 24975	9.9	Deletion
Arenig Fawr	Pt. 510.8m	510.8	SH 77218 24611	500.0	SH 77276 24637	10.8	Addition
Arenig Fawr	Pt. 510.0m	510.0	SH 81962 31463	499.1	SH 82130 31691	10.9	Addition
Arenig Fawr	Bryn Ceffyl	506.7	SH 78639 37135	496.3	SH 78628 37059	10.5	Addition
Carnedd y Filiast	Foel Fach	544.5	SH 94433 42381	534.4	SH 94485 42417	10.1	Addition
Carnedd y Filiast	Llechwedd Du	511.4	SH 89360 44629	497.1	SH 89096 44273	14.3	Addition
Craig Berwyn	Pt. 585.6m	585.6	SJ 13031 32635	571.5	SJ 12920 32539	14.2	Addition
Craig Berwyn	Pt. 568.7m	568.7	SJ 13353 39284	558.9	SJ 12789 39284	9.8	Deletion
Craig Berwyn	Cerrig Duon	549.3	SJ 12833 38497	540.0	SJ 12785 38809	9.3	Deletion
Esgeiriau Gwynion	Hen Gerrig	518.1	SH 95070 18770	507.9	SH 95012 18806	10.2	Addition
Esgeiriau Gwynion	Pt. 505.5m	505.5	SH 96714 19988	497.1	SH 96813 20159	8.4	Deletion
Aran Fawddwy	Pt. 844.2m	844.2	SH 86926 24690	833.6	SH 86852 24656	10.5	Addition
Aran Fawddwy	Pt. 657.9m	657.9	SH 85683 20921	648.1	SH 85705 20958	9.8	Deletion
Cadair Idris	Pt. 686.3	686.3	SH 73642 13623	678.1	SH 73540 13543	8.2	Deletion
Y Garn	Cefn Blaen Merin	552.9	SN 81271 81064	538.1	SN 81424 81034	14.8	Addition
Y Garn	Bryn Llochesau	563.8	SN 82447 80795	554.1	SN 82319 80472	9.7	Deletion

The hills whose status has subsequently been confirmed by a Trimble GeoXH 6000 survey appear below:

The Welsh Highlands Sub-Tops (P10 to <P15)

Group	Name	Summit (m)	Summit GR	Bwlch (m)	Bwlch GR	Drop (m)	Change
Carnedd Llywelyn	Craig Eigiau	688.4	SH 71280 64670	678.2	SH 71218 64674	10.2	Addition
Glyder Fawr	Tryfan	910.8	SH 66393 59332	901.6	SH 66378 59359	9.2	Deletion
Moelwyn Mawr	Pt. 524.3m	524.3	SH 66117 45783	513.5	SH 66131 45774	10.7	Addition