Other DataTypes

Dear all,

I wish to know is there any other datatypes we can use in VisAD 
besides "RealType"? "RealType" will eat up a lot of memory when my
data is huge. Is it possible to have something like "ByteType" or 
"IntegerType" to handle the mass data which is byte or integer type?
(for memory saving purposes).

Thanks all, have a nice day.