Pattern recognition techniques advantages

The main advantage of piezoelectric devices is that, in principle, any process that results in a mass change at an interface can be measured. However, this very nonselective transduction process is also a major disadvantage in that it mandates the use of even more selective surface chemistries than are required for other types of chemical transducer systems. This will make the implementation of piezoelectric chemical sensing devices for ocean measurements rather difficult, but by no means impossible. Indeed, the coupling of pattern recognition techniques with an array of marginally selective piezoelectric transducers may, in the future, make these devices more useful for quantitative ocean measurements. 

Now a series of chemometric methods have been used in SAR. Generally speaking, different chemometric methods are suitable for different cases for each kind of these methods has its own advantages and disadvantages, and the best approach should be the combination of several chemometric techniques that complement each other, as that we have discussed in chapter one. So it is helpful to introduce briefly the different chemometric methods widely used in SAR. Here chemical pattern recognition methods will be specially emphasized since different projections can provide plentiful information from different projection maps from the hyperspaces. In SAR practice, some chemical pattern recognition methods are often used as complementary methods in the application of SVM. 

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