LocationTech JTS Topology Suite 1.20.0 Release Review

New Features

• Add CoverageValidator CoveragePolygonValidator
• Add CoverageGapFinder
• Add CoverageUnion
• Add CoverageSimplifier
• Add OverlayNG support for simple GeometryCollection inputs
• Add Geometry.hasDimension(int dim) method
• Add ConcaveHull.alphaShape function
• Add OffsetCurve Joined mode
• Add PointLocation.isOnSegment function
• Add RelateNG API for improved topological relationship functionality and performance

Functionality Improvements

• Improve TopologyPreservingSimplifier to prevent edge-disjoint line collapse 
• Improve OffsetCurve to return more linework for some input situations 
• Reduce buffer curve short fillet segments 
• Added ability to specify boundary for LargestEmptyCircle 
• Improve DouglaPeuckerSimplifier and TopologyPreservingSimplifier to handle ring endpoints 
• Add Angle functions sinSnap and cosSnap to avoid small errors, e.g. with buffer operations 
• Improve Buffer input simplification for rings 
• Improve CoverageSimplifier with ring removal, smoothing, inner/outer and per-feature tolerances

Bug Fixes

• Fix WKBReader and WKBWriter handling of M measures when writing to WKB and reading from WKB
• Fix PreparedGeometry handling of EMPTY elements 
• Fix WKBReader parsing of WKB containing multiple empty elements 
• Fix LineSegment.orientationIndex(LineSegment) to correct orientation for non-collinear segments on right 
• Fix DepthSegment compareTo method 
• Ensure GeometryFixer does not change coordinate dimension 
• Improve ConvexHull radial sort robustness 
• Improve robustness of Delaunay Triangulation frame size heuristic 
• Fix PreparedLineString.intersects to handle mixed GCs correctly 
• Fix QuadEdgeSubdivision.TriangleEdgesListVisitor 
• Fix PolygonHoleJoiner to handle all valid inputs (allows PolygonTriangulator, ConstrainedDelaunayTriangulator, and ConcaveHullOfPolygons to work correctly) 
• Fix OffsetCurve handling of input with repeated points 
• Fix OffsetCurve handling zero offset distance 
• Fix MaximumInscribedCircle and LargestEmptyCircle to avoid long looping for thin inputs 
• Fix OffsetCurve to use a minimum QuadrantSegs value 
• Fix HilbertEncoder Y extent handling
• Fix Geometry.getCoordinate to return non-null coordinate for collections with empty first element 
• Fix LargestEmptyCircle to handle polygonal obstacles 
• Make intersection computation more robust 
• Fix VariableBuffer to handle zero vertex buffer distances correctly 
• Fix IncrementalDelaunayTriangulator to ensure triangulation boundary is convex 
• Fix OverlayNG Area Check heuristic for difference 
• Fix InteriorPointPoint to handle empty elements
• Fix DistanceOp for empty elements 
• Fix predicates for MultiPoint with EMPTY 
• Fix InteriorPoint for MultiLineString with EMPTY 
• Fix TopologyPreservingSimplifier to prevent incorrect topology from jumping components 
• Fix OffsetCurve to ensure end segments are included 
• Fix PointLocator to respect BoundaryNodeRule for single lines 
• Fix BufferOp Inverted Ring Removal check 
• Improve VariableBuffer segment buffer cap generation 
• Fix TopologyPreservingSimplifier ring endpoint removal indexing

Performance Improvements

• Improve Polygonizer performance in some cases with many islands 
• Improve Convex Hull performance by avoiding duplicate uniquing 
• Improve HPRtree performance 
• Improve performance of noding and overlay via HPRtree 
• Improve DistanceOp performance for Point-Point 
• Improve CoveragePolygonValidator via section performance optimization