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    Re: NOW what?
    From: Bill B
    Date: 2015 Aug 18, 17:54 -0400

    On 8/18/2015 4:32 PM, Frank Reed wrote:
    > Exactly. The "geoid", which is the surface that is equivalent to "sea
    > level" worlwide, has little undulations in it.
    
    In my reply to Brad Morris I included the URL www.ngs.noaa.gov/geoid URL
    for the differences between the geoid and ellipsoidal surfaces
    mentioned in Calder's book. I'm getting a 404 error for that URL.
    
    Another site contains a wealth of information that topic:
    http://geodesy.noaa.gov/ .
    

       
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