Version 1.18.0

Release Date: 12/23/2020

GeometryPrecisionReducer is less tolerant of invalid input (but also avoids failing on some valid ones) (#648)
Moved Position and Quadrant to org.locationtech.jts.geom package
Removed SimpleSnapRounder - use SnapRoundingNoder instead
Deprecated MCIndexSnapRounder - use SnapRoundingNoder instead

Improve Orientation.isCCW to handle flat topology collapse (#588)
Add KMLReader (#593)
Add Densifier.setValidated method to allow disabling expensive polygon validation (#595)
Add OverlayNG codebase (#599)
Add Z support in OverlayNG (#645)
Add system property jts.overlay=ng to enable use of OverlayNG in Geometry methods (#615)
Add SnapRoundingNoder (#599)
Add SnappingNoder (#599)
Change GeometryPrecisionReducer to use OverlayNG with Snap-Rounding
Change GeometryNoder to use SnapRoundingNoder
Add KdTree size and depth methods (#603)
Improve WKBWriter to write empty Polygons using a more compact representation (#623)
Support read and initialize internal structure of STRtree and Quadtree (#634)
Improve GeometryPrecisionReducer to handle GeometryCollections (#648)
Add Orientation.isCCWArea (#655)

Improve performance of UnaryUnionOp by removing OverlayUnion optimization (#644)

Fix RayCrossingCounter to handle XYZM coordinates (#589)
Fix PackedCoordinateSequence to always use XYZM coordinates when dimension is 4 (#591)
Fix OrdinateFormat to work around a JDK issue with the minus sign character in Locale.NO (#596)
Fix GeoJsonReader to throw a ParseException for empty arrays (#600)
Fix WKTFileReader handling of files with large amount of whitespace (#616)
Fix WKBWriter to output 3D empty Points with 3 ordinates (#622)
Fix Geometry.reverse to handle all geometry structures (#628)
Fix GeometryPrecisionReducer to avoid silently mangling input (#648)
Fix Geometry.buffer to avoid dropping large polygon areas in some situations (#655)
- also fixes DouglasPeuckerSimplifier (#498)

JTS TestBuilder