Provided by: libgeo-distance-xs-perl_0.13-2build4_amd64 bug

NAME

       Geo::Distance::XS - speed up Geo::Distance

SYNOPSIS

           use Geo::Distance::XS;

           my $geo = Geo::Distance->new;
           my $distance = $geo->distance(mile => $lon1, $lat1 => $lon2, $lat2);

DESCRIPTION

       The "Geo::Distance::XS" module provides faster C implementations of the distance
       calculations found in "Geo::Distance".  See the documentation for that module for usage.

       NOTE: As of version 0.13, Geo::Distance automatically uses this module if it is installed.

FORMULAS

       In addition to the formulas offered in "Geo::Distance", this module implements the
       additional formulas:

   alt: Andoyer-Lambert-Thomas Formula
       This is faster than the Vincenty formula, but trades a bit of accuracy.

PERFORMANCE

       This distribution contains a benchmarking script which compares "Geo::Distance::XS" with
       "Geo::Distance" and "GIS::Distance::Fast". These are the results on a MacBook 2GHz with
       Perl 5.14.2:

           ---- [ Formula: hsin ] ------------------------------------
           perl     - distance from LA to NY: 2443.08796228363 miles
           xs       - distance from LA to NY: 2443.08796228363 miles
           gis_fast - distance from LA to NY: 2443.08796228363 miles

                       Rate gis_fast     perl       xs
           gis_fast   24802/s       --     -70%     -98%
           perl       81919/s     230%       --     -92%
           xs       1003704/s    3947%    1125%       --

           ---- [ Formula: tv ] ------------------------------------
           perl     - distance from LA to NY: 2448.24135235512 miles
           xs       - distance from LA to NY: 2448.2413523656 miles
           gis_fast - distance from LA to NY: 2448.24135235512 miles

                       Rate     perl gis_fast       xs
           perl      18101/s       --     -19%     -95%
           gis_fast  22330/s      23%       --     -94%
           xs       345717/s    1810%    1448%       --

           ---- [ Formula: polar ] ------------------------------------
           perl     - distance from LA to NY: 2766.02509696782 miles
           xs       - distance from LA to NY: 2766.02509696782 miles
           gis_fast - distance from LA to NY: 2766.02509696782 miles

                       Rate gis_fast     perl       xs
           gis_fast   19200/s       --     -78%     -98%
           perl       87682/s     357%       --     -93%
           xs       1214700/s    6227%    1285%       --

           ---- [ Formula: cos ] ------------------------------------
           perl     - distance from LA to NY: 2443.08796228363 miles
           xs       - distance from LA to NY: 2443.08796228363 miles
           gis_fast - distance from LA to NY: 2443.08796228363 miles

                       Rate gis_fast     perl       xs
           gis_fast   24435/s       --     -69%     -98%
           perl       78913/s     223%       --     -93%
           xs       1147836/s    4597%    1355%       --

           ---- [ Formula: gcd ] ------------------------------------
           perl     - distance from LA to NY: 2443.08796228363 miles
           xs       - distance from LA to NY: 2443.08796228363 miles
           gis_fast - distance from LA to NY: 2443.08796228363 miles

                       Rate gis_fast     perl       xs
           gis_fast   18270/s       --     -75%     -98%
           perl       74472/s     308%       --     -93%
           xs       1102769/s    5936%    1381%       --

           ---- [ Formula: mt ] ------------------------------------
           perl     - distance from LA to NY: 2443.08796228363 miles
           xs       - distance from LA to NY: 2443.08796228363 miles
           gis_fast - distance from LA to NY: 2443.08796228363 miles

                       Rate gis_fast     perl       xs
           gis_fast   17935/s       --     -75%     -98%
           perl       71739/s     300%       --     -94%
           xs       1135525/s    6231%    1483%       --

       This distribution contains another benchmarking script which compares only the XS formulas
       over several different coordinates:

                   Rate    tv  hsin   alt   cos    mt   gcd polar
           tv     16906/s    --  -90%  -90%  -91%  -91%  -91%  -92%
           hsin  165414/s  878%    --   -4%   -8%  -10%  -13%  -17%
           alt   172032/s  918%    4%    --   -5%   -7%   -9%  -14%
           cos   180326/s  967%    9%    5%    --   -2%   -5%  -10%
           mt    184357/s  991%   11%    7%    2%    --   -3%   -8%
           gcd   189253/s 1019%   14%   10%    5%    3%    --   -6%
           polar 200386/s 1085%   21%   16%   11%    9%    6%    --

           Calculated length for short distance:
               alt  : 40.3740136064528 miles
               cos  : 40.3095459813536 miles
               gcd  : 40.3095459813294 miles
               hsin : 40.3095459813294 miles
               mt   : 40.3095459813536 miles
               polar: 46.7467797109043 miles
               tv   : 40.3740136384531 miles

           Calculated length for long distance:
               alt  : 2448.24135691376 miles
               cos  : 2443.08796228363 miles
               gcd  : 2443.08796228363 miles
               hsin : 2443.08796228363 miles
               mt   : 2443.08796228363 miles
               polar: 2766.02509696782 miles
               tv   : 2448.2413523656 miles

           Calculated length for nearly antipodes:
               alt  : 12340.6455133245 miles
               cos  : 12340.327635068 miles
               gcd  : 12340.327635068 miles
               hsin : 12340.327635068 miles
               mt   : 12340.327635068 miles
               polar: 12368.4764642469 miles
               tv   : 12340.7483034002 miles

           Calculated length for antipodes:
               alt  : 12429.86673988 miles
               cos  : 219.005548031861 miles
               gcd  : 12438.0476860875 miles
               hsin : 12438.0475680956 miles
               mt   : 219.005548031861 miles
               polar: 12438.0476860875 miles
               tv   : 12370.1885059814 miles

           Calculated length for polar antipodes:
               alt  : 12429.86673988 miles
               cos  : 12438.0476860875 miles
               gcd  : 12438.0476860875 miles
               hsin : 12438.0476860875 miles
               mt   : 12438.0476860875 miles
               polar: 12438.0476860875 miles
               tv   : 12429.8667398787 miles

SEE ALSO

       Geo::Distance

       <http://blogs.esri.com/esri/apl/2010/09/28/fast-times-at-geodesic-high/>

REQUESTS AND BUGS

       Please report any bugs or feature requests to
       <http://rt.cpan.org/Public/Bug/Report.html?Queue=Geo-Distance-XS>. I will be notified, and
       then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

       You can find documentation for this module with the perldoc command.

           perldoc Geo::Distance::XS

       You can also look for information at:

       ·   GitHub Source Repository

           <http://github.com/gray/geo-distance-xs>

       ·   AnnoCPAN: Annotated CPAN documentation

           <http://annocpan.org/dist/Geo-Distance-XS>

       ·   CPAN Ratings

           <http://cpanratings.perl.org/d/Geo-Distance-XS>

       ·   RT: CPAN's request tracker

           <http://rt.cpan.org/Public/Dist/Display.html?Name=Geo-Distance-XS>

       ·   Search CPAN

           <http://search.cpan.org/dist/Geo-Distance-XS/>

COPYRIGHT AND LICENSE

       Copyright (C) 2009-2014 gray <gray at cpan.org>, all rights reserved.

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

AUTHOR

       gray, <gray at cpan.org>