{@linkplain org.geotools.referencing.datum.AbstractDatum Datum} implementation. An explanation for this package is provided in the {@linkplain org.opengis.referencing.datum OpenGIS® javadoc}. The remaining discussion on this page is specific to the Geotools implementation.

### Extensions to OpenGIS API

Convenience methods were added to the {@linkplain org.geotools.referencing.datum.DefaultEllipsoid default ellipsoid} class in order to compute orthodromic distance.