8: Further information

Please note this page is no longer updated.  For the latest version download the pdf.

Quite a lot of information on this subject is available on the Internet. You might find on line implementations of the formulae given in the annexes, although beware that Ordnance Survey does not check or endorse these. Here are a few addresses directly related to the information in this booklet:

http://earth-info.nga.mil/GandG/publications/index.htm is the US NGA Geodesy and Geophysics department publications page. This has lots of information on the WGS84 datum and the EGM96 global Geoid model, including a nice colour picture of the global Geoid.

http://igscb.jpl.nasa.gov/ is the IGS home page. This gives access to all the IGS GPS products and information about them.

http://www.euref-iag.net/ is the EUREF home page. EUREF is the governing body of the ETRS89 coordinate system.

http://www.epncb.oma.be/ is the EUREF permanent GPS network information system.

ftp://lareg.ensg.ign.fr/pub/euref/info/guidelines/REF.FRAME.SPECIFV4 is the text file from which the ETRS89-ITRS transformation given in section 6.5 is taken.

http://www.ordnancesurvey.co.uk/gi/nationalgrid/index.html is an interactive guide to the National Grid on the Ordnance Survey Web site. Detailed online guide to the National Grid on Ordnance Survey GPS site 

Here are a few book titles on geodesy, GPS surveying and map projections.

• Introduction to geodesy: The history and concepts of modern geodesy
  by James R. Smith, published by John Wiley & Sons, 1997.
• Geodesy: The concepts
  by Petr Vanicek and Edward Krakiwsky, published by North-Holland 1982.
• GPS satellite surveying
  2nd edition, by Alfred Leick, published by John Wiley and Sons 1995
• GPS Theory and Practice
  4th edition, by B Hofmann-Wellenhof, H Lichtenegger and J Collins, published by Springer-Verlag 1997.
• Map Projections: Theory and Applications
  by Frederick Pearson, published by CRC Press 1990.
• Map Projections: A Reference Manual
  by Lev Bugayevskiy and John Snyder, published by Taylor and Francis 1995.

Specific enquiries concerning the Ordnance Survey coordinate systems, the National GPS Network, the National Grid Transformation and the National Geoid Model can be answered by Ordnance Survey Customer Helpline, telephone 08456 05 05 05.

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