Overview of Apache sis-referencing module. This Javadoc is only about one specific module. For the full Apache SIS project, see the aggregated Javadoc.
All Packages Feature and Geometry Referencing Metadata 
Package Description
org.apache.sis.distance  
org.apache.sis.geometry
Basic geometric objects (envelopes and direct positions).
org.apache.sis.io.wkt
Well Known Text (WKT) parsing and formatting.
org.apache.sis.metadata.iso  
org.apache.sis.parameter
Descriptions and values of parameters used by a coordinate operation or a process.
org.apache.sis.referencing
Base classes for reference systems used for general positioning.
org.apache.sis.referencing.crs
Coordinate Reference System (CRS) definitions as coordinate systems related to the earth through datum.
org.apache.sis.referencing.cs
Coordinate System (CS) definitions as the set of coordinate system axes that spans the coordinate space.
org.apache.sis.referencing.datum
Relationship of a CoordinateSystem (an abstract mathematical entity) to the earth or other system.
org.apache.sis.referencing.factory
Creates Coordinate Reference System (CRS) objects from given properties or authority codes.
org.apache.sis.referencing.factory.sql
Factories for geodetic objects defined in a SQL database, typically the EPSG dataset.
org.apache.sis.referencing.operation
Relationship between any two Coordinate Reference Systems (CRS).
org.apache.sis.referencing.operation.builder
Helper classes for creating Math Transforms from a set of points.
org.apache.sis.referencing.operation.matrix
Matrix implementations for spatiotemporal referencing.
org.apache.sis.referencing.operation.projection
Map projection implementations.
org.apache.sis.referencing.operation.transform
Conversions or transformations of multi-dimensional coordinate points.