JTS 1.8.0	JTS Version 1.8.0 Release Date: Dec 19, 2006   Functionality Improvements Improved robustness for overlay operations, via using geometry snapping Added Angle class Added methods to Triangle class Added LineSegment.midPoint method Added ability to specify output of Z values to WKTWriter Added setFormatted, setTab, setMaxCoordinatesPerLine methods to WKTWriter Added BoundaryNodeRule classes, and ability to specify a Boundary Node Rule in RelateOp, IsSimpleOp, BoundaryOp Added ability to get the failure location to IsSimpleOp Added BoundaryOp with improved algorithm for lineal geometries. Changed lineal Geometry classes to use it. Enhanced Geometry overlay methods to accept empty GeometryCollections. Enhanced Error Handling for WKTReader Added CoordinateSequenceFilter Added AffineTransformation and AffineTransformationBuilder API Changes Changed API for IsSimpleOp (required to support returning failure location) Bug Fixes Fixed bug in GeometryFactory.buildGeometry causing failure if input contained all GeometryCollections of the same subclass Changed AssertFailure to TopologyException in PolygonBuilder Improved correctness of RobustLineIntersector in certain cases where segment endpoints intersect
JTS 1.7.2	JTS Version 1.7.2 Release Date: June 22, 2006   Functionality Improvements Added support for EWKB (SRIDs only) to WKBReader isValid now checks for invalid coordinates (e.g. ones with Nan or infinite numbers) Bug Fixes Fixed bug in CoordinateArrays.ptNotInList. Changed polygonize.EdgeRing to used corrected code. Fixed bug causing duplicate points in ScaledNoder Fixed bug causing Null Pointer for empty geometries in OraWriter Changed AssertFailure to TopologyException in EdgeNode
JTS 1.7.1	JTS Version 1.7.1 Release Date: March 20, 2006   See Version History for full list of changes
JTS 1.7	JTS Version 1.7 Release Date: December 7, 2005   See Version History for full list of changes
JTS 1.6	JTS Version 1.6 Release Date: February 3, 2005   See Version History for full list of changes
JTS 1.5	JTS Version 1.5 Release Date: September 22, 2004   Functionality Improvements CGAlgorithms#isCCW now handles coordinate lists with repeated points. Also throws an IllegalArgumentException if the input ring does not have 3 distinct points isValid now checks for invalid coordinates (e.g. ones with Nan or infinite numbers) added copyDeep() method to CoordinateArrays added geometry simplification operations DouglasPeuckerSimplifier and TopologyPreservingSimplifier added methods to Quadtree and STRtree to remove items and query using the Visitor pattern Performance Improvements Added short-circuit tests in geometry named predicates based on envelope tests Bug Fixes Various bug fixes - see Version History Documentation More examples provided in com.vividsolutions.jtsexamples package See Version History for full list of changes
JTS 1.4	JTS Version 1.4 Release Date: November 4, 2003   Functionality Improvements Added "LINEARRING" tag to WKT syntax Added GeometryEditor class to allow easy copy/modify of Geometrys Added GeometricShapeFactory class to easily create standard geometric shapes Geometries can now carry arbitrary user-defined data objects (via Geometry#get/setUserData(Object) method) Added CoordinateSequence and CoordinateSequenceFactory interfaces, and default implementations (BasicCoordinateSequence, BasicCoordinateSequenceFactory) Added DistanceOp#getClosestPoints method, which returns the closest points between two Geometries Added com.vividsolutions.jts.noding package containing classes to perform fast indexed noding of linestrings Added com.vividsolutions.jts.operation.polygonize package containing classes to perform polygonization Added com.vividsolutions.jts.operation.linemerge package containing classes to perform line merging BufferOp now allows end cap styles to be specified. Three types are supported: round, butt and square. Performance Improvements Buffering is now faster and much more robust Overlap operations are now more robust Bug Fixes Numerous bug fixes - see Version History Documentation More examples provided in com.vividsolutions.jtsexamples package Added JTS Developer's Guide See Version History for full list of changes
JTS 1.3	JTS Version 1.3 Release Date: April 4, 2003 Semantics Changes all Geometry methods are now reentrant (thread-safe) Fixed-precision coordinates are now stored in a rounded but non-scaled form. This makes them compatible with non-precise (Floating) coordinates, and simplifies working with precise coordinates directly.  Mixed precision models are now supported in Geometry methods; method results are in the more precise of the input precision models. Offsets are no longer supported in the Fixed precision model. This is necessary to allow storing fixed precision coordinates in a non-scaled form. This does not reduce the total precision available, since coordinates are stored in a floating-point format. SRID and Precision Model are no longer checked for equality during Geometry operations. This removes a limitation which provided little semantic benefit. Functionality Improvements added Geometry.isWithinDistance(Geometry g, double distance) method, to provide optimized proximity queries added Geometry.buffer(double distance, int quadrantSegments) method, allowing control over accuracy of buffer approximation added Geometry.getCentroid() method added Geometry.getInteriorPoint() method, which uses heuristic methods to return a point in the interior of a Geometry Performance Improvements Eliminated unnecessary computation of self-intersections in rings during relate and spatial functions. This provides a large increase in speed when working with large rings and polygons. (Note that IsValid still checks for these self-intersections, which are illegal in LinearRings) Add short-circuit code to RobustLineIntersector to detect non-intersections more efficiently API Changes Added default constructor to WKTReader. It uses the default GeometryFactory Add two static intersects() methods to Envelope, to allow computing intersections with envelopes defined by points only. The Geometry class is now marked as Serializable See Version History for full list of changes
JTS 1.2	JTS Version 1.2 Release Date: October 7, 2002 JTS now allows Geometrys to have repeated points. TopologyExceptions may now be thrown by spatial overlay methods.  RobustLineIntersector now uses "normalized" coordinates to maximize the accuracy of intersection computation. Spatial indexes improved in both performance and robustness Added EnhancePrecisionOp, which uses precisioning enhancing techniques to reduce the number of failure cases due to robustness problems. Fixed isValid for GeometryCollections containing Polygons, which were sometimes erroneously returning a validity failure for correct Geometrys. IsValid now checks for too few points in a geometry component (e.g. due to repeated points in a ring) Added Geometry.getArea() and Geometry.getLength() methods Added TopologyValidationError.getErrorType() method See Version History for full list of changes
JTS 1.1	JTS Version 1.1. Release Date: March 28, 2002 Added Geometry.isSimple() and Geometry.isValid() methods Improved design of topological data structures Added Geometry.setSRID() method Improved functionality of the Envelope class Added ability to write to an arbitrary java.io.Writer object to WKTWriter Added Validate and Mark Location functionality to TestBuilder
JTS 1.0	JTS Version 1.0. Release Date: February 1, 2002 This release is functionally complete (apart from isSimple and isValid). The spatial predicates are robust under both Fixed and Floating precision models. The spatial overlay and buffer functions are unfortunately not fully robust. The overlay functions should perform similarly to most other spatial APIs, however. The buffer function is robust and precise for many inputs, but does have known failure cases.