GIS::Distance::Fast - C implementation of GIS::Distance formulas.
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.
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.
GIS::Distance::Formula::Cosine::Fast
GIS::Distance::Formula::Haversine::Fast
GIS::Distance::Formula::Vincenty::Fast
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.
Aran Clary Deltac <bluefeet@cpan.org>
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
