- 15^ 



Various types of directional data analysis schemes should be 

 investigated. Among them are the Maximum Likelihood Method, (Clarke 

 and Gedling, 1981; Jefferys, et.al.,1981; Goda,1981; LaCosE,1971). 

 and the estimate of higher order directional Fourier coefficients as 

 alluded to in Section II.B.l and discussed in Appendix E. Proper 

 conditioning of DPG data might also allow directional estimates made 

 without the signal of the absolute pressure gauge. 



In all future developments of the DPG, as with any 

 well-designed ocean instrument, careful consideration must be given 

 to the problems of corrosion, biological fouling, scour and 

 instrument settlement into the seabed, installation and maintenance, 

 electronics failure and noise, and interference from local marine 

 activity. The limitations of directional wave spectra analyses 

 should always be recognized when dealing with the data obtained from 

 the instrument. 



