wave 

 propagation \ 8 

 direction 



W o- 



-o E 



5 P 



Figure 2. Dimensions and orientation of the Harvest Platform array 



digitized, and then fed to a concentrator where the set of samples was buffered. 

 Buffered signals were periodically transmitted to shore through a telephone con- 

 nection, and ultimately stored as collection files on the main computer of the 

 CDIP, Ocean Engineering Research Group, SIO, La Jolla, CA. Each collection 

 time series is 8,192 sec (2 hr 16 min 32 sec) in length. 



Data processing for results presented in this report was not performed at the 

 CDIP site, and so is independent of the processing done and published by that 

 group (Monthly reports, Coastal Data Information Program). Data collections 

 were transferred to the Field Research Facility (FRF) of the U.S. Army Engineer 

 Waterways Experiment Station's Coastal Engineering Research Center for pro- 

 cessing by high-resolution techniques that are different from those used by CDIP. 

 Data transfer was accomplished over an electronic network. 



Collection Schedule and Data Set Size 



Collections were made eight times daily, at approximately 3-hr intervals. 

 Nominal collection start times were 0200, 0500, 0800, 1 100, 1400, 1700, 2000, 

 and 2300 GMT. Actual collection start times varied by several minutes on either 

 side of these nominal start times because the amount of time required to establish 

 a phone link varied from collection to collection. There are several periods of sev- 

 eral days duration where collections are virtually continuous. These occur when 

 CDIP shifts to a collection mode intended to detect tsunami waves, and result in 

 12 directional spectral estimates daily instead of the normal eight. 



Chapter 2 Directional Gauge 



