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Lat/Long to OS Grid ref

This is a discussion on Lat/Long to OS Grid ref within the Development forums, part of the MapPoint Desktop Discussion category; Can anybody point me in the direction of a converter from Lat/Long to OS grid ref (for the UK) which ...

  1. #1
    seekin is offline Junior Member White Belt
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    Lat/Long to OS Grid ref

    Can anybody point me in the direction of a converter from Lat/Long to OS grid ref (for the UK) which I can use in VB6. Ideally in OCX or DLL form.

    Thanks.

  2. #2
    Wilfried is offline Senior Member Black Belt
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  3. #3
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    Winwaed is offline Mapping-Tools.com Black Belt
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    Re: Lat/Long to OS Grid ref

    I think there's also a manual on the OS website. I know I have a printout somewhere that I printed out years ago. It goes through the theory - eg. what the transformation actually means and what the assumptions are. The trick that is easy to forget (and Microsoft *did* forget in MapPoint 2002!) is that OS grid references use the Airy '36 geoid rather than the WGS84 used by MapPoint (and most GPS devices).


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  4. #4
    loudcox is offline Misplaced White Belt
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    Re: Lat/Long to OS Grid ref

    Try here for a detailed discussion of, and and C code for, the complete conversion cycle from NMEA data through to Long/Lat and then OS Grid Refs.

    The linked page is specifically about LL to OSRefs but the entire article is very useful.

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