J6462 : Spider, Windmill Hill Triangulation Pillar

taken 14 years ago, near to Ballyhalbert, Co Down, Northern Ireland

Spider, Windmill Hill Triangulation Pillar
Spider, Windmill Hill Triangulation Pillar
Detail on the slightly damaged 'spider' on the Windmill Hill Triangulation Pillar J6462 : Windmill Hill Triangulation Pillar. Note that it is marked
"TRIANGULATION STATION
OSNI".

This pillar is now part of the OSNI passive GPS network - I think that the exact location of the station may be the brass rivet which can be seen on the bottom left.
OSNI Triangulation Stations

The re-triangulation of Northern Ireland by the Ordnance Survey Northern Ireland began in 1950. This was the first complete survey of Northern Ireland which included observations with the new primary triangulation of the country, its connection with the Republic of Ireland and the cross-channel connection between Ireland and Great Britain. This began by OSNI establishing a series of triangulation stations throughout the country. Almost all of these stations were topped by trig pillars and 80, mainly primary and secondary pillars, had been constructed by October 1949. Measurements between primary stations began in 1950 and measurements for these and the secondary stations were completed by July 1956. The construction and measurements for tertiary stations were completed later (probably no later than the mid 1960s). Only two stations are not topped by pillars - Lighthouse Island, marked by a brass rivet, and Ardglass, which utilised the top of a high stone folly. The older triangulation stations on the Lough Foyle Base Line were also re-surveyed as part of this process. A majority of the stations are still extant today but a few have been removed or destroyed.

OSI and OSNI Passive GPS Stations

Ordnance Survey Ireland and Ordnance Survey of Northern Ireland passive GPS stations. A list of the OSI stations, including co-ordinates and some precise location details is available at LinkExternal link for OSi and use Archive LinkExternal link to get OSNI data. Many of the stations are existing trig pillars but others have recently been established.

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J6462, 8 images   (more nearby search)
Photographer
Date Taken
Sunday, 8 August, 2010   (more nearby)
Submitted
Monday, 9 August, 2010
Category
Triangulation Pillar   (more nearby)
Subject Location
Irish: geotagged! J 6414 6269 [10m precision]
WGS84: 54:29.1654N 5:28.0748W
Camera Location
Irish: geotagged! J 6414 6269
View Direction
South-southwest (about 202 degrees)
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