Javadoc
A parameter descriptor identical to the supplied one except for the default value. The
constructor expects a model created by one of the
MathTransformProvider#createDescriptor(Identifier[],double,double,double,Unit),
usually using some neutral default value. For example the base class for map projection providers
defines a set of
org.geotools.referencing.operation.projection.MapProjection.Provider#SEMI_MAJOR. However some map projections are specific to a particular area (for
example the
NewZealandMapGrid and may wish to override the
neutral default values with some default value appropriate for that area.