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Any spatial address with a latitude of +90 (90) or -90 degrees will
specify the position at the North or South Pole, respectively. The
component for longitude may have any legal value.
 
With the exception of the special condition described above, this
form is specified in Department of Commerce, 1986, Representation of
geographic point locations for information interchange (Federal
Information Processing Standard 70-1):  Washington,  Department of
Commerce, National Institute of Standards and Technology.
 
The simple formula for converting degrees-minutes-seconds into
decimal degrees is:
 
  decimal = degrees + minutes/60 + seconds/3600.
 
Format Definition: The property is defined by the following notation:
 
  geo        = "GEO" geoparam ":" geovalue CRLF
 
  geoparam   = *(";" xparam)