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.
For 9-band products, the peak band is defined as that with the most energy.
| 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) |
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
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