Projects / GEOS


GEOS is a complete C++ implementation of the functions and predicates defined in the OpenGIS "Simple Features for SQL" specification. It includes high quality implementations of all the important spatial relationships and operations, robust versions of all functions in the dimensionally extended 9 intersection predicate model, implementations of the operators, Buffer(), Union(), and Intersection(), and all other SFSQL functions including Area(), Length(), Centroid(), etc.


Recent releases

  •  31 May 2012 19:24

    Release Notes: Does not abort on NaN overlay input (#530). Reduces CommonBitsRemover harmful effects during overlay op (#527). Better cross-compiler support (#534). Enables overlay ops short-circuits (#542). Envelope-based short-circuit for symDifference (#543). Fixes support for PHP 5.4 (#513). Fixes TopologyPreservingSimplifier invalid output on closed line (#508). Reduces calls to ptNotInList, greatly speeding up Polygonizer (#545).

    •  25 Jun 2011 16:55

      Release Notes: The C API was expanded, including buffer offset generation, geometry cleansing, snapping, orientation, and cover predicates. Many bugs were fixed in memory handling.

      •  11 Mar 2010 17:43

        Release Notes: This release adds a single-sided buffer operation. It has been synched to JTS-1.10: a faster buffer (10x), better edge handling, bugfixes and memory leak fixes, and removal of the MarkupSTL library.

        •  18 Mar 2009 17:21

          Release Notes: PreparedGeometry operations for very fast predicate testing: Intersects(), Covers(), CoveredBy(), and ContainsProperly(). Easier builds under MSVC and OpenSolaris. A thread-safe CAPI option. IsValidReason has been added to CAPI. CascadedUnion operation for fast unions of geometry sets. A single-sided buffering operation has been added. Numerous bugfixes.

          •  06 Jan 2008 13:03

            No changes have been submitted for this release.


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