Roppa Trig Pillar

sketchfab

A sturdy triangulation pillar stands proudly at Roppa on Helmsley Moor's northern end. Hikers frequently pass by this structure, which was erected on prominent hilltops during the 1930s to serve as permanent survey points for the Re-triangulation of Great Britain from 1935 to 1962. This effort updated data gathered during the Principle Triangulation from 1791 to 1853. Originally, at least two other pillars were visible from each trig point, creating a comprehensive network of basic trigonometry with an accuracy of 3mm throughout Great Britain. Modern laser and aerial surveying have made these pillars obsolete; many have vanished or become hidden by vegetation. Nonetheless, the concept remains simple: anyone can replicate the results using a theodolite and two other people today. In fact, this excursion was primarily an excuse to create more models in snowy conditions, although most of the snow had melted away by the time I reached the site. The winter scenery at Roppa is both beautiful and desolate. A total of 60 images were processed using Metashape.