pgSphere is a PostgreSQL extension for spherical geometry.

It provides:

* New data types (points, spherical polygons, paths, circles, ellipses, coordinate ranges)

* Input and output of data in various formats

* Membership, overlap, and other operators

* Circumference and area of objects

* Object rotation by Euler angles

* Indexing of spherical data types

This is an R-Tree implementation using GiST for spherical objects

like spherical points and spherical circles with

useful functions and operators.

NOTICE:

This version will work only with postgresql version 9.1 and above.