I would like to congratulate both Chris Preston - Network Rail and Jonathan Iliffe - UCL on delivering a well structure and thought through lecture. The lecture helped to improve our knowledge on reasons for distortions in co-ordinate systems and variables that can affect scale factor. They delivered a succinct explanation of the snake grid co-ordinate system and the advantages of using such a system.
When working on projects that extend for a few kilometres, engineers and surveyors are accustomed to the concept of a local site grid that effectively makes a flat Earth assumption.
As projects grow beyond a few kilometres, however, it becomes necessary to introduce a projected coordinate system – and then all those working on the site have the problem of making scale factor corrections. If there is a significant height range across the project then there is the added problem of making reductions to sea level or any other standard reference height.
The SnakeGrid solution provides a coordinate grid system that maintains a unity scale factor along a trend line that follows the project in plan and height.
In this way, projects such as railways, highways and pipelines that extend for hundreds of kilometres can have a single seamless grid with a scale factor distortion less than a few parts per million along the whole project and for several kilometres on either side.
For more information visit: http://www.snakegrid.org
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