...
To rotate the wind vectors, NIDAS uses the pointing angle of the sonic +V axis (Vazimuth), which is pointing azimuth of the sonic boom + 90, or the sonic +U axis - 90.
From The following are from logbook entries of the sonic azimuths:azimuths. Note that all measured azimuths are in degrees magnetic, with the declination set to 0 on the compass or datascope, to reduce untraceable mental mistakes.
site | log date | pointing | sonic boom azimuth, magnetic | boom azimuth, true (mag+12.2) | Vazimuth, true (boom+90) |
|---|---|---|---|---|---|
playa1 | 12/18 | west | 76.9 + 180 = 256.9 | 269.1 | 359.1 |
abc2 | 12/16 | east | 249.5 - 180 = 69.5 | 81.7 | 171.7 |
hiland3 | 12/14 | east | 249.5 - 180 = 69.5 | 81.7 | 171.7 |
wvally4 | 12/16 | west | 86.7 + 180 = 266.7 | 278.9 | 8.9 |
wvally4 | 12/19 | " | 80.3 + 180 = 260.3 | 272.5 | 2.5 |
eslope5 | 12/15 | east | 248.7 - 180 = 68.7 | 80.9 | 170.9 |
wslope6 | 12/13 | west | 77.8 + 180 = 257.8 | 270 | 0.0 |
river7 | 12/13 | west | 85.5 + 180 = 265.5 | 277.7 | 7.7 |
...