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Manual Reference Pages  -  GIS::DISTANCE::FORMULA::MATHTRIG (3)

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NAME

GIS::Distance::Formula::MathTrig - Great cirlce distance calculations using Math::Trig.

CONTENTS

DESCRIPTION

This formula uses Math::Trig’s great_circle_distance function which at this time uses math almost exactly the same as the GIS::Distance::Cosine formula. If you want to use the GIS::Distance::Cosine formula you may find that this module will calculate faster (untested assumption). For some reason this and the Cosine formula return slight differences at very close distances. This formula has the same drawbacks as the Cosine formula.

Normally this module is not used directly. Instead GIS::Distance is used which in turn interfaces with the various formula classes.

FORMULA



  lat0 = 90 degrees - phi0
  lat1 = 90 degrees - phi1
  d = R * arccos(cos(lat0) * cos(lat1) * cos(lon1 - lon01) + sin(lat0) * sin(lat1))



As stated in the Math::Trig POD.

METHODS

    distance

This method is called by GIS::Distance’s distance() method.

SEE ALSO

GIS::Distanc

Math::Trig

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.
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perl v5.20.3 GIS::DISTANCE::FORMULA::MATHTRIG (3) 2015-06-11

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