Subject: | SGP/SMOS/E27 - Incorrect Offset for Wind Directon |
DataStreams: | sgp30smosE27.b1, sgp1smosE27.b1
|
Description: | An incorrect offset of 7 degrees was subtracted from the wind direction to correct for
misalignment of the towers to true north. The wind direction data may be corrected but the
vector averaged wind speed cannot. Subsequent audits have highlighted problems with past
measurements of tower alignments. All corrections to wind direction are being removed and
Users are directed to view the Instrument Handbook for a table listing all tower
alignment deviations from true north. Users can adjust the data at their discretion. |
Suggestions: | To correct for a negative offset in wind direction the following formula can
be used:
WindCalc = wdir + 7degrees
if WindCalc > 360
then
Windcorr = WindCalc - 360
Else
Windcorr = WindCalc |
Measurements: | sgp30smosE27.b1: - Wind Direction(wdir)
- Wind Speed (vector averaged)(wspd_va)
more
sgp1smosE27.b1: - Wind Direction(wdir)
- Wind Speed (vector averaged)(wspd_va)
more
|