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GIS::Distance calculates distances between geographic points on, at the moment,
planet Earth. Various "FORMULAS" are available that provide different levels of
accuracy versus speed.
GIS::Distance::Fast, a separate distribution, ships with C implmentations of
some of the formulas shipped with GIS::Distance. If you're looking for speed
then install it and the ::Fast formulas will be automatically used by this
module.
WWW: https://metacpan.org/release/GIS-Distance
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