Seager Hill South Top
(SO 624 379)
There has been a Significant Height Revision when
compared to data on contemporary Ordnance Survey 1:25,000 Explorer maps to a
hill whose highest summit has been under debate for a number of years, and
although the lower of the two summits is not currently classified within any
listing to English hills, the higher summit is listed, with one of its
classifications being a Tump. This height revision was initiated be a
survey with the Trimble GeoXH 6000 which took place on the 30th
January 2018 in good conditions with clear visibility.
The name of the hill is Seager Hill South Top and
it is situated in Region 38 the Welsh Borders and in Section 38B West
Gloucestershire, Hereford and Worcester.
The hill is positioned with the A 438 road to its north-east and has a number
of narrow lanes to its north north-east, east and south, and has the small
community of Woolhope Cockshoot to its south-east and Putley towards its east.
As the summit of the hill is not a part of
designated open access land permission to visit should be sought, for those
wishing to do so a track designated a bridleway ascends to a large barn to the
north of the summit with a public footpath then heading north to crest the
ridge between this hill and its north-western counterpart, the continuation of
this public footpath can also be ascended from the south through a wood, it is
only a short walk from where this footpath crests the ridge to the high point
of this hill.
Prior to the survey with the Trimble GeoXH 6000
this hill was noted with a 270m summit height based on an 886ft (270.1m)
levelled height that appears on the series of Ordnance Survey Six-Inch maps.
 |
| Extract from the series of Ordnance Survey Six-Inch maps |
The 271.5m (converted to OSGM15) summit height
produced by the Trimble GeoXH 6000 is not a dramatic increase from this hill’s
current noted height, and in itself does not come within the parameters used
within this page heading, however these parameters prioritise numerical data
from Ordnance Survey 1:25,000 Explorer maps, and because of this it does come
within the parameters of the Significant Height Revisions used within this page
heading, these parameters are:
The term Significant Height Revisions applies to
any hill whose Ordnance Survey or Harvey map summit spot height has a 2m or
more discrepancy when compared to the survey result produced by the Trimble
GeoXH 6000 or analysis of data produced via LIDAR, also included are hills
whose summit map data is missing an uppermost ring contour when compared to the
data produced by the Trimble or by LIDAR.
As heights on different scaled Ordnance Survey maps are not consistent
the height given on the 1:25,000 Explorer map is being prioritised in favour of
the 1:50,000 Landranger map for detailing these revisions.
 |
| Extract from the Ordnance Survey 1:25,000 Explorer map |
Therefore, this hill’s new summit height is 271.5m
(converted to OSGM15) which is 2.5m higher than the 269m summit spot height
that appears on the Ordnance Survey 1:25,000 Explorer map.
The full details for the hill are:
Cardinal Hill: Seager
Hill
Summit Height (New Height):
271.5m (converted to OSGM15)
Name: Seager Hill
South Top
OS 1:50,000 map: 149
Summit Grid Reference:
SO 62418 37928
Drop: 21m
 |
| Gathering data with the Trimble GeoXH 6000 at the summit of Seager Hill South Top which resulted in this hill's significant height revision |
Myrddyn Phillips (March 2018)
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