File:Mynydd Cilan Triangulation Station - geograph.org.uk - 532236.jpg

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Mynydd_Cilan_Triangulation_Station_-_geograph.org.uk_-_532236.jpg (640 × 480 pixels, file size: 69 KB, MIME type: image/jpeg)

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English: Mynydd Cilan Triangulation Station English tourists gather round the Mynydd Cilan trig at 117m above sea level. Hell's Mouth Beach can be seen in the background.

Trig points were a tool to give surveyors a frame of reference for surveying the UK in the days before electronic positioning aids were available (GPS etc). Typically, a trig point is a concrete post set on a high point such as a hill with a metal disc inset in the top which you can put your theodolite in. The trig point is at an accurately surveyed and documented position so you can survey other stuff relative to one or more trig points.

from www.jeremyp.net/trigpoint/
Date
Source From geograph.org.uk
Author John Harvey
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John Harvey / Mynydd Cilan Triangulation Station / 
John Harvey / Mynydd Cilan Triangulation Station
Camera location52° 47′ 14″ N, 4° 32′ 15″ W  Heading=337° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo
Object location52° 47′ 17″ N, 4° 32′ 17″ W  Heading=337° Kartographer map based on OpenStreetMap.View this and other nearby images on: OpenStreetMapinfo

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This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
Attribution: John Harvey
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Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.

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current20:29, 5 February 2011Thumbnail for version as of 20:29, 5 February 2011640 × 480 (69 KB)GeographBot (talk | contribs)== {{int:filedesc}} == {{Information |description={{en|1=Mynydd Cilan Triangulation Station English tourists gather round the Mynydd Cilan trig at 117m above sea level. Hell's Mouth Beach can be seen in the background. Trig points were a tool to give

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