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<longdescription lang="en">
Geometric Engine Open Source provides a spatial object model and
fundamental geometric functions. It implements the geometry model
defined in the OpenGIS Consortium Simple Features Specification for
SQL. Functions provided include: spatial predicates (based on the
DE-9IM model), overlay functions (intersection, difference, union,
symmetric difference), buffer, convex hull, area and distance
functions, and topological validity checking.