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Trig Bagging Lists

It wasn't long after we started bagging the Yorkshire Tops that we realised many of them had Ordnance Survey Triangulation Columns on top of them, or trig points as we all know them as. As we were visiting them incidentally it seemed to make sense to keep a track of the one's we'd been to and soon the list began to fill out.

The UK network of concrete pillar triangulation points was built and measured between 1936 and 1962 by the Ordnance Survey, for a project known as the Retriangulation of Great Britain. In low lying or flat areas some trig points may be only a few metres above sea-level. When all the trig points were in place, it was possible, in clear weather, to see at least two other trig points from any one trig point. Careful measurements of the angles between the lines-of-sight of the other trig points then allowed the construction of a system of triangles which could then be referenced back to a single baseline to construct a highly accurate measurement system that covered the entire country. This led to the seamless mapping we enjoy today.

Below you will find a link to the trig point tick lists we are currently working our way through. Simply click the relevant picture to see our progress.

The Yorkshire Dales Trig Points

The UK network of concrete pillar triangulation points was built and measured between 1936 and 1962 by the Ordnance Survey, for a project known as the Retriangulation of Great Britain. In low lying or flat areas some trig points may be only a few metres above sea-level. When all the trig points were in place...

 

The Peak District Trig Points

While we were visiting all the Peak District tops, it seemed to makes sense to include all the area's Trig Points as well, many of these concrete monuments would coincide with the fell tops anyway...

 

The Lake District Trig Points

While we're visiting the Wainwright summits we'll almost certainly come across a number of the Lake District trig points, so this list will capture and record all our visits to these trig points.

 

North Yorks Moors Trig Points

We've wandered into the North Yorks Moors National Park a couple of times now and we certainly expect to be back here in the future, so it seemed only right that the trig points we visit here are captured and recorded in the database, along with the other National Parks that we visit.