dap4/d4lib/src/main/java/dap4/dap4lib/netcdf/Nc4Notes.java
static public long
    getVarId(VarNotes note)
    {
        return getVarId(note.gid, note.id, note.getFieldIndex());
    }
static public long
    getVarId(VarNotes note)
    {
        return getVarId(note.gid, note.id, note.getFieldIndex());
    }
Manage the compound id for variables