/usr/lib/perl5/Geo/Distance/XS.pm is in libgeo-distance-xs-perl 0.11-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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use strict;
use warnings;
use Carp qw(croak);
use Geo::Distance;
use XSLoader;
our $VERSION = '0.11';
our $XS_VERSION = $VERSION;
$VERSION = eval $VERSION;
XSLoader::load(__PACKAGE__, $XS_VERSION);
my ($orig_distance_sub, $orig_formula_sub);
BEGIN {
$orig_distance_sub = \&Geo::Distance::distance;
$orig_formula_sub = \&Geo::Distance::formula;
}
sub import {
no warnings qw(redefine);
no strict qw(refs);
my %formulas = map { $_ => undef } @{__PACKAGE__.'::FORMULAS'};
*Geo::Distance::distance = \&{__PACKAGE__.'::distance'};
*Geo::Distance::formula = sub {
my $self = shift;
if (@_) {
my $formula = shift;
croak "Invalid formula: $formula"
unless exists $formulas{$formula};
$self->{formula} = $formula;
}
return $self->{formula};
};
}
# Fall back to pure perl after calling 'no Geo::Distance::XS'.
sub unimport {
no warnings qw(redefine);
*Geo::Distance::formula = $orig_formula_sub;
*Geo::Distance::distance = $orig_distance_sub;
}
1;
__END__
=head1 NAME
Geo::Distance::XS - speed up Geo::Distance
=head1 SYNOPSIS
use Geo::Distance::XS;
my $geo = Geo::Distance->new;
my $distance = $geo->distance(mile => $lon1, $lat1 => $lon2, $lat2);
=head1 DESCRIPTION
The C<Geo::Distance::XS> module provides faster C implementations of the
distance calculations found in C<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.
=head1 FORMULAS
In addition to the formulas offered in C<Geo::Distance>, this module
implements the additional formulas:
=head2 alt: Andoyer-Lambert-Thomas Formula
This is faster than the Vincenty formula, but trades a bit of accuracy.
=head1 PERFORMANCE
This distribution contains a benchmarking script which compares
C<Geo::Distance::XS> with C<Geo::Distance> and C<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
=head1 SEE ALSO
L<Geo::Distance>
L<http://blogs.esri.com/esri/apl/2010/09/28/fast-times-at-geodesic-high/>
=head1 REQUESTS AND BUGS
Please report any bugs or feature requests to
L<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.
=head1 SUPPORT
You can find documentation for this module with the perldoc command.
perldoc Geo::Distance::XS
You can also look for information at:
=over
=item * GitHub Source Repository
L<http://github.com/gray/geo-distance-xs>
=item * AnnoCPAN: Annotated CPAN documentation
L<http://annocpan.org/dist/Geo-Distance-XS>
=item * CPAN Ratings
L<http://cpanratings.perl.org/d/Geo-Distance-XS>
=item * RT: CPAN's request tracker
L<http://rt.cpan.org/Public/Dist/Display.html?Name=Geo-Distance-XS>
=item * Search CPAN
L<http://search.cpan.org/dist/Geo-Distance-XS/>
=back
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2009-2012 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.
=head1 AUTHOR
gray, <gray at cpan.org>
=cut
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