NAME

GIS::Distance::Fast - C implementation of GIS::Distance formulas.

DESCRIPTION

This distribution re-implements some, but not all, of the formulas that come with GIS::Distance in the C programming language. C code is generally much faster than the perl equivilent.

In most of my testing I've found that the C version of the formulas outperform the Perl equivelent by at least 2x.

This module need not be used directly. GIS::Distance will automatically use the ::Fast formulas when they are available.

INLINE

Rather than using the complex XS or alternatives, I've opted to use Inline::C since it is so much simpler to bind the C code to Perl. Due to this you should make a directory called '.Inline' in your home directory. Otherwise you will end up with _Inline directories all over the place.

FORMULAS

GIS::Distance::Formula::Cosine::Fast

GIS::Distance::Formula::Haversine::Fast

GIS::Distance::Formula::Vincenty::Fast

BUGS

The GIS::Distance::Formula::Vincenty::Fast produces slightly different results than GIS::Distance::Formula::Vincenty. Read the POD for GIS::Distance::Formula::Vincenty::Fast for details.

TEST COVERAGE

  ---------------------------- ------ ------ ------ ------ ------ ------ ------
  File                           stmt   bran   cond    sub    pod   time  total
  ---------------------------- ------ ------ ------ ------ ------ ------ ------
  ...ce/Formula/Cosine/Fast.pm  100.0    n/a    n/a  100.0  100.0   37.4  100.0
  ...Formula/Haversine/Fast.pm  100.0    n/a    n/a  100.0  100.0   25.6  100.0
  .../Formula/Vincenty/Fast.pm  100.0    n/a    n/a  100.0  100.0   37.0  100.0
  Total                         100.0    n/a    n/a  100.0  100.0  100.0  100.0
  ---------------------------- ------ ------ ------ ------ ------ ------ ------

AUTHOR

Aran Clary Deltac <bluefeet@cpan.org>

LICENSE

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