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Steve Troxel > Geo-Coordinates-Transform-0.10 > Geo::Coordinates::Transform



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Module Version: 0.10   Source  


Geo::Coordinates::Transform - Transform Latitude/Longitude between various different coordinate functions


  use Geo::Coordinates::Convert;

  # List of a lat/longs in various formats. 
  my @lst = ( 47.9805, -116.5586, '47 58.8300', '-116 33.5160', '47 58 49', '-116 33 30'); 
  my $cnv = new Geo::Coordinates::Convert();

  my $out_ref = []; # Array reference
  # Convert List to Decimal-Degrees... DD.DDDD
  $out_ref = $cnv->cnv_to_dd(\@lst); 
  # Convert List to Degree Decimal-Degrees... DD MM.MMMM
  $out_ref = $cnv->cnv_to_ddm(\@lst); 

  # Convert List to Degrees Minutes Decimal Seconds DD MM SS.SSSS
  $out_ref = $cnv->cnv_to_dms(\@lst); 


There are several formats used to present geographic coordinates. For example:

 * DMS Degrees:Minutes:Seconds (48 30 30, -117 30' 30")
 * DM Degrees:Decimal-Minutes (48 30.5, -117 30.5'), 
 * DD Decimal-Degrees (48.5083333, -17.5083333)

This module converts a list of provided latitude and longitude coordinates in any of the three formats above (mixed input is ok) and converts to the desired format. Note that special characters or non-numerical characters such as " will throw an warning and return NaN for that list item.

In addition, the input does not interpert N,S,W,E designators but expects coordinates to be in positive or negative representation.

Format of the output can be controlled via input arguments in the constructor. The arguments are expected to be in the form of a hash reference. For example:

        # Change output format
        # Hash aruements are 
        # 'dd_fmt' = Decimal-Degrees format
        # 'dm_fmt' = Decimal-Minutes format
        # 'ds_fmt' = Decimal-Second format
        # Example 
        my $cnv = new Geo::Coordinates::Convert( {dd_fmt=>'%3.2f', dm_fmt=>'%3.1f', ds_fmt=>'%d'} );

Minimal sanity checks are performed. 75 minutes will be handled as 1 degree and 15 minutes.


The Geographic Coordinate System wiki ia good place for background documentation

A useful web interface using this module can be found here.


Only three methods provided. Expected input is a reference to a list and output is a reference to list.

  $out_ref = $cnv->cnv_to_dd(\@lst);   # To Degree Decimal-Degrees... DD.DDDDDDD
  $out_ref = $cnv->cnv_to_ddm(\@lst);  # To Degree Decimal-Minutes... DD MM.MMMM
  $out_ref = $cnv->cnv_to_dms(\@lst);  # To Degrees Minutes Decimal Seconds DD MM SS.SSSS


<troxel at>


Copyright (C) 2010 by Troxel

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

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