PHP Extension to handle common geospatial functions
The extension currently has implementations of the Haversine and
Vincenty's formulas for calculating distances, an initial bearing calculation
function, a Helmert transformation function to transfer between different
supported datums, conversions between polar and Cartesian coordinates,
conversions between Degree/Minute/Seconds and decimal degrees, a method to
simplify linear geometries, as well as a method to calculate intermediate
points on a LineString.
License: PHP 3.01