The attached plots were made with our Splus function, plot.tilt, that does a linear least squares fit to find the plane of mean flow, and plots the wind vector elevation angle vs azimuth. The planar fit becomes a sine wave on the tilt plot.
From a long term plot of the sonic "diag" value, I chose two periods where the the values were consistently very small. plot.tilt discards 5 minute wind averages when "diag" is above 0.01, or more than 1% of the data has a non-zero CSAT3 diagnostic value.
date |
height |
lean |
leanaz |
w offset (m/s) |
elevation residual rms (deg) |
offset residual rms (m/s) |
|---|---|---|---|---|---|---|
Mar 2011 |
2m |
4.1 |
-1.7 |
0.03 |
2.9 |
0.04 |
|
7m |
5.9 |
8.2 |
0.07 |
5.7 |
0.08 |
|
16m |
5.9 |
-0.2 |
-0.01 |
3.1 |
0.011 |
|
30m |
4.5 |
-2.1 |
0.02 |
2.7 |
0.014 |
|
43m |
4.3 |
-5.9 |
0.04 |
3 |
0.02 |
Aug 2011 |
2m |
|
|
|
|
|
March 2011 |
|---|
| There are no images attached to this page. |
August 2011 |
|---|
| There are no images attached to this page. |
dpar(start="2011 2 21 00:25",end="2011 4 4 07:26",coords="instrument") dpar(hts=2) plot.tilt(flag="diag",ellim=10,spdmin=0.5)