As part of a batch release of patches for stable branches, the 3.12.1 release of GEOS is now available to download.

Release notes for the various branches are available: 3.10.6, 3.11.3, 3.12.1

The 3.12.1 release is a bug fix release.

The 3.12 release of GEOS is now available to download.

• This release includes the following new features in the C API (and of course underlying changes to the C++ code to support these features):

  • GEOSDisjointSubsetUnion, anptimized union algorithm for inputs that can be divided into subsets.
  • GEOSLineSubstring, to clip a line using a start and end fractional length.
  • GEOSEqualsIdentical, to test exact equality (with regards to order, structure, etc) of two geometries.
  • GEOSOrientPolygons, to enforce a ring orientation on all polygonal elements in the input geometry.
  • GEOSSTRtree_build, to force an immediate build of an STRtree.
  • GEOSConcaveHullByLength, to build a concave hull by removing the longest outer edges of the Delaunay Triangulation of the space between the polygons, until the specified maximm edge length is reached
  • GEOSGeomGetM, to read the M-dimensional value of a geometry.
  • GEOSVoronoiDiagram, returns the Voronoi polygons or edges of the vertices of the given geometry.
  • GEOSCoverageSimplifyVW, GEOSCoverageUnion, GEOSCoverageIsValid for working with “polygonal coverages”, collections of polygons that follow coverage rules (no overlaps, exact vertex equivalence on shared edges).
  • GEOSGeom_releaseCollection, to free a collection while leaving the sub-geometries intact.
  • GEOSMinimumRotatedRectangle, a rework of the minimum rectangle code to be faster and more correct.

• GEOS has been updated to read and write “M” dimension. As with the “Z” coordinate support, not all operations can preserve the “M” dimension, but best efforts are made to retain it through calculations, input and output.

• Much work on the core code of GEOS was carried out with a maintenance grant funded by the GDAL project and carried out by Dan Baston.

As part of a batch release of patches for stable branches, the 3.11.2 release of GEOS is now available to download.

Release notes for the various branches are available: 3.10.5, and 3.11.2

The 3.11.2 release is a bug fix release.

As part of a batch release of patches for stable branches, the 3.11.1 release of GEOS is now available to download.

Release notes for the various branches are available: 3.9.4, 3.10.4, and 3.11.1

The 3.11.1 release is a bug fix release.

The 3.11.0 release of GEOS is now available to download.

This release includes new features for building “concave hulls” for both point and polygon input. For polygon input, the hull will be guaranteed to not cross into the interiors of the input polygons.

The line merger has been enhanced to support a mode that only merges lines which share orientation.

The offset curve algorithm has been updated to be more reliable for different kinds of semi-degenerate inputs, and may output different curves than the previous implementation, for those kinds of inputs. For “normal” inputs, the results should look very much like the old implementation.

As usual, numerous bugs have been fixed, and a few performance improvements discovered and implemented.

As part of a batch release of patches for all stable branches, the 3.10.3 release of GEOS is now available to download.

Release notes for the various branches are available: 3.7.4, 3.8.3, 3.9.3 and 3.10.3.

The 3.10.3 release is a bug fix release.

The 3.10.2 release of GEOS is now available to download.

This release is a bug fix release.

The 3.10.1 release of GEOS is now available to download.

This release is primarily to fix some version numbering issues in the initial 3.10.0 source tarball. Some extra fixes are bundled as well.

The 3.10 release of GEOS is now available to download.

• This release includes the following new features in the C API (and of course underlying changes to the C++ code to support these features):

  • CAPI additions for testing whether geometries are within a distance of each other, GEOSDistanceWithin and GEOSPreparedDistanceWithin
  • CAPI addition for adding extra vertices to a geometry, GEOSDensify
  • CAPI additions for high-performance construction/reading of coordinate sequences from/to memory buffers, GEOSCoordSeq_copyFromArrays, GEOSCoordSeq_copyFromBuffer, GEOSCoordSeq_copyToArrays, and GEOSCoordSeq_copyToBuffer
  • CAPI addition for new validity enforement algorithm, GEOSMakeValidWithParams
  • CAPI addition for ISO WKB output, GEOSWKBWriter_getFlavor and GEOSWKBWriter_setFlavor
  • CAPI addition to create a constrained delaunay of polygonal input, GEOSConstrainedDelaunayTriangulation