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In Chris Gebhardts' article on obtaining Lat/Lon ....

This is a discussion on In Chris Gebhardts' article on obtaining Lat/Lon .... within the MapPoint Desktop Discussion forums, part of the Map Forums category; In Chris Gebhardts' article on obtaining Lat/Lon from Mappoint he mentions that he makes the assumption that the earth is ...

  1. #1
    Anonymous is offline Senior Member Black Belt
    Join Date
    Jul 2002
    Posts
    5,137
    In Chris Gebhardts' article on obtaining
    Lat/Lon from Mappoint he mentions that
    he makes the assumption that the earth
    is a perfect sphere - just as the MP
    Distance function does. My question is:
    what kind of correction is needed to
    plot the derived Lat/Lon values on a
    map based on WGS83 datum.
    Thanks

  2. #2
    Anonymous is offline Senior Member Black Belt
    Join Date
    Jul 2002
    Posts
    5,137
    I think you are right that
    the Distance function assumes the earth is a perfect sphere, and there
    is probably a formula for correcting the results of Chris' lat/lon
    extraction code. However, when we tested the accuracy of the lat/lon
    values calculated (using MapInfo as the referee), the deviations were
    very minimal. Anything within a 1,000 mile range from the point the
    Distance was calculated from appeared to be within feet of the true
    location. Maybe the accuracy deteriorates the closer you get to the
    poles, but I guess that is not such a big issue for most of us.

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