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Ordnance Survey launches free access to traditional control information


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Traditional horizontal control stations, triangulation or 'trig' stations (pillars and other survey marks) and vertical control (Bench marks) have been the mainstay of control information in Great Britain for many years. They provided the means to link surveys to the national horizontal and vertical datums as well as providing structure to a survey. To do this it was necessary to physically occupy either the triangulation station or bench mark with survey equipment and purchase the control coordinates from Ordnance Survey.


Ordnance Survey has made a commitment to continue to offer traditional control information to surveyors who do not use methods such as the Global Positioning System (GPS) to provide control. However, due to the quantity of traditional stations and the expense of their survey, tied in with the greater accuracy and uniformity that new satellite-based survey techniques provide, it is neither sensible nor realistic for Ordnance Survey to maintain the triangulation and Bench mark network.



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Barry Hunter will like it, but I think he has memorised all that data anyway. Go on, test him :)


Well I basically understand the techy terms, and have downloaded their whole database (about 500,000 points) if that counts... (to create a better search as theirs is pants)

Edited by barryhunter
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