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Topcon Positioning Support Hub  is a dedicated place for Land Surveyors United  members who use Topcon Instruments in the field to share experiences and support one another with troubleshooting issues. This group is specifically for discussions and tutorials related to Topcon Land Surveying Equipment.

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  • You don't need a GFF format for Topcon Tools. Tools accepts the raw file from NGS if your in the US or one of it's territories. However if your outside of the good old US, or even if you are and too busy to navigate the NGS website, try this...Re-install Topcon Tools, it's a free download and free upgrades !!!! at Yes, you have to register and login (look in the upper right hand corner of the Topcon website). Special Note: Hurry all you Tools users - Topcon is moving from Tools to "Magnet" and I don't think that will be free.... Anyway, when you install a new version of Topcon Tools select "custom" install. This will allow you to download geoid models from all parts of the world, including the US, with the install. You must be connected to the internet. If you are in a, well, not so populated place in this small world, you can select to download a world geoid produced by the National Geospatial Intelligence Agency (NGA) .  This is a VERY large file, too big for most data collectors. As a work around...Use the free utility, TopLINK, to create your own geoid defined by a min-max Long Lat. ref:

    !!!!!! The National Geodetic Survey has released updated models for 2012...

  • Thank you, my work is regularly between 5°E and 18°W Longitude, and between 16°N and 40°N. thanks for your help

  • Land Surveyor

    aside from this list of tools which may give you your answer, this manual may come in handy for looking it up


  • Sure. That is no problem.  Can you tell me where you are approximately located so I can send you the right one?

    • Land Surveyor

      Hi! I know this is an old post, but we have always used the egm96 but we are currently needing the egm2008 to use with topcon tools or sokkia survey office and the sokkia grx1 gps.

      Could you plase send me the gff file. i am in 16 north zone, central america.

      Thanks a lot.


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