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9-Band Wave Direction Data Format: dd files

As requested by the US Army Corps of Engineers, wave direction is separated into 9 period bands based on the estimated wave frequency spectra. Angles reported in the directional data are true compass headings from which the waves are traveling at the location of the measuring instrument. The data files have 11 columns in the following format.

Column Description
1 Date UTC (YYYYMMDDHHMM)
2 Peak Direction (deg)
3 22+ sec. mean direction (deg)
4 18-22 sec. mean direction (deg)
5 16-18 sec. mean direction (deg)
6 14-16 sec. mean direction (deg)
7 12-14 sec. mean direction (deg)
8 10-12 sec. mean direction (deg)
9 8-10 sec. mean direction (deg)
10 6-8 sec. mean direction (deg)
11 2-6 sec. mean direction (deg)
* Note that 9-band data from directional buoys obtained from CDIP before November 17, 2005 may have Tp and Dp values that differ from those now reported. This is a result of change in our processing; for more details, please refer to the change report.

Sample Data

From the file dd03601199801, wave direction at Grays Harbor, Washington in January 1998. (Header not included in text files.)
      UTC      Dp          
YYYYMMDDHHMM (DEG)     +22  22-18  18-16  16-14  14-12  12-10   10-8    8-6    6-2
----------------------------------------------------------------------------------

199801010513  282      316    246    272    279    278    282    275    254    211
199801010543  281      295    263    281    268    271    281    277    257    213
199801010613  288       21    296    270    274    271    288    281    246    216
199801010643  291       83    251    269    258    277    291    272    250    223
199801010713  280      162    264    337    262    271    280    275    234    222
199801010743  290       53    258    274    284    266    290    274    245    225


CDIP's major funding contributors are the US Army Corps of Engineers and the California Department of Boating and Waterways.
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