A 1D coordinate reference system used for recording heights or depths. Vertical CRSs make use of the direction of gravity to define the concept of height or depth, but the relationship with gravity may not be straightforward.
Used with coordinate system type: {@linkplain org.apache.sis.referencing.cs.DefaultVerticalCS Vertical}.
{@section Immutability and thread safety}This class is immutable and thus thread-safe if the property
values (not necessarily the map itself), the coordinate system and the datum instances given to the constructor are also immutable. Unless otherwise noted in the javadoc, this condition holds if all components were created using only SIS factories and static constants.
@author Martin Desruisseaux (IRD, Geomatys)
@since 0.4 (derived from geotk-1.2)
@version 0.4
@module
@see org.apache.sis.referencing.datum.DefaultVerticalDatum
@see org.apache.sis.referencing.cs.DefaultVerticalCS