Working with SnakeGrid

Practical use

Running these coordinates through a convertor such as SnakeGrid PointWise will put them into the required SnakeGrid system. Or this could be done directly by the software associated with the GNSS, as most major equipment systems (such as Trimble, Topcon and Leica) have the SnakeGrid algorithms programmed in.

You are now in a coordinate system that effectively has a 1:1 relationship with the ground surface. Run a traverse between control points – no need to make any kind of scale factor correction. Design railway alignments in this coordinate system – the same geometry will be set out on the ground. Some users may not even know they’re in something called SnakeGrid coordinates – it’s just a 2D system with no scale error, a bit like a local site grid.

Other users may want to relate this system to other coordinate systems – for example to introduce land ownership data in the national coordinate system or historical records. The integration of SnakeGrid in geospatial enabled software with on the fly reprojections means your highly accurate engineering grid is just as accessible as a traditional wide area map projection.

Using SnakeGrid

Once created we’ll deliver a parameter file and a report detailing the characteristics of the grid.

• GNSS receivers—all major kit manufactures have adopted the SnakeGrid algorithms allowing GNSS receivers to record or set out points using the SnakeGrid coordinate system.
• Total stations—the 1 to 1 relationship between the coordinate system and the ground means no more scale corrections required.
• In the office the clear and definable link back to a recognised geographic CRS means data from other source can easily be related, whether you are bringing data in to supplement your design / planning drawings, or you are looking to carry our design coordination with a project on a different grid.