NAME
   Geo::Coordinates::DecimalDegrees - convert between
   degrees/minutes/seconds and decimal degrees

SYNOPSIS
     use Geo::Coordinates::DecimalDegrees;
     (degrees, $minutes, $seconds, $sign) = decimal2dms($decimal_degrees);
     (degrees, $minutes, $sign) = decimal2dm($decimal_degrees);
     $decimal_degrees = dms2decimal($degrees, $minutes, $seconds);
     $decimal_degrees = dm2decimal($degrees, $minutes);

DESCRIPTION
   Latitudes and longitudes are most often presented in two common formats:
   decimal degrees, and degrees, minutes and seconds. There are 60 minutes
   in a degree, and 60 seconds in a minute. In decimal degrees, the minutes
   and seconds are presented as a fractional number of degrees. For
   example, 1 degree 30 minutes is 1.5 degrees, and 30 minutes 45 seconds
   is 0.5125 degrees.

   This module provides functions for converting between these two formats.

FUNCTIONS
   This module provides the following functions, which are all exported by
   default when you call "use Geo::Coordinates::DecimalDegrees;":

   decimal2dms($decimal_degrees)
       Converts a floating point number of degrees to the equivalent number
       of degrees, minutes, and seconds, which are returned as a 3-element
       list. Typically used as follows:

         ($degrees, $minutes, $seconds) = decimal2dms($decimal_degrees);

       If $decimal_degrees is negative, only $degrees will be negative.
       $minutes and $seconds will always be positive.

       If $decimal_degrees is between 0 and -1, $degrees will be returned
       as 0. If you need to know the sign in these cases, you can use this
       longer version, where $sign is 1, 0, or -1 depending on whether
       $decimal_degrees is positive, 0, or negative:

         ($degrees, $minutes, $seconds, $sign) = decimal2dms($decimal_degrees);

   decimal2dm($decimal_degrees)
       Converts a floating point number of degrees to the equivalent number
       of degrees and minutes which are returned as a 2-element list.
       Typically used as follows:

         ($degrees, $minutes) = decimal2dm($decimal_degrees);

       If $decimal_degrees is negative, only $degrees will be negative.
       $minutes will always be positive.

       If $decimal_degrees is between 0 and -1, $degrees will be returned
       as 0. If you need to know the sign in these cases, you can use this
       longer version, where $sign is 1, 0, or -1 depending on whether
       $decimal_degrees is positive, 0, or negative:

         ($degrees, $minutes, $sign) = decimal2dm($decimal_degrees);

   dms2decimal($degrees, $minutes, $seconds)
       Converts degrees, minutes, and seconds to the equivalent number of
       decimal degrees:

         $decimal_degrees = dms2decimal($degrees, $minutes, $seconds);

       If $degrees is negative, then $decimal_degrees will also be
       negative.

   dm2decimal($degrees, $minutes)
       Converts degrees and minutes to the equivalent number of decimal
       degrees:

         $decimal_degrees = dm2decimal($degrees, $minutes);

       If $degrees is negative, then $decimal_degrees will also be
       negative.

CAVEATS
   The functions don't do any sanity checks on their arguments. If you have
   a good reason to convert 61 minutes -101 seconds to decimal, go right
   ahead.

AUTHOR
   Walt Mankowski, <[email protected]>

COPYRIGHT AND LICENSE
   Copyright 2003-2006 by Walt Mankowski

   This library is free software; you can redistribute it and/or modify it
   under the same terms as Perl itself.

THANKS
   Thanks to Andy Lester for telling me about pod.t

   Thanks to Paulie Pena IV for pointing out that I could remove a division
   in decimal2dms().

   Thanks to Tim Flohrer for reporting the bug in decimal2dms() and
   decimal2dm() when $decimal_degrees is between 0 and -1.

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