Here are angles I shot today with the DataScope from 1030-1130 today. John and I don't completely trust datascope readings, but they did seem internally consistent (i.e. when I thought the angle should have been more southerly than the previous reading, it was).
Note that the 3 sonics on each trident are <reasonably> consistent -- especially 9/10/11u. Trident 6/7/8u is definitely rotated with respect to trident 9/10/11u.
11t of 130 degrees and 3t and 10t of 134 are not typos.
Finally, note that the relatively close agreement of the horiz array angles are not coincidence -- it is easier to see and adjust (a bit) angles when they are on the horiz array with a close spacing. Also, the EMT conduit now links all of them together.
P.S. These have now been entered in the cal_files (less 131.7 degrees, as before).
Note Aug14 ~9:30-10:30PDT, I JohnM decided to take a 'shot' myself. These are in column 'U8-14. The differences with Steves are in 'UD8-14 '. When I took these, it was further away than I'd tried before (well beyond the berm), and nominally I had the horizontal reference of the datascope on the horizon with the sonic still in view at the top...ie tried to minimize the tilt angle as best i could. I aligned visually using symmetry between the 'left-right' probes balanced on either side of the square box. I only did the upwind at this time because later on the winds were good and I didn't want to mess them up. From these readings, difference was substantial but consistent with Steve's.....may need to 'cal?' I'm hoping KK will be able to do a few proper theadolite sun-angle shots tomorrow.
Note: Aug15. Sun-Angle Sanity Check:
Kurt, Chris and I took sunangle method shots of 2 sonics to compare with the data-scope readings. We aligned the theadolite to the sun for 36:01.27N, 119:53.59W and using the sunangle program obtained the offset angle. The magnetic declination for this latitude/date = 13.6. From the sun angle readings: U6 = 144.:49:06 ~ 144.8deg true - 13.6 = 131.2 magnetic; U11 = 148:19:50 ~ 148.3deg true - 13.6 = 134.7 magnetic. NOTICE that these magnetic readings for U7, U11 match SteveO's within about .5deg, but mine don't match. Conclusion: Use Steve's readings.....
|
upwind |
U8-14 |
UD8-14 |
bottom |
top |
---|---|---|---|---|---|
1 |
|
|
|
131.0 |
|
2 |
|
|
|
132.9 |
|
3 |
135.1 |
141.0 |
5.9 |
131.9 |
134.7 |
4 |
133.4 |
140.1 |
6.7 |
132.7 |
132.5 |
5 |
132.7 |
139.3 |
6.6 |
131.5 |
132.7 |
6 |
131.6 |
138.5 |
6.9 |
131.8 |
131.5 |
7 |
131.3 |
138.4 |
7.1 |
132.4 |
132.2 |
8 |
129.9 |
136.3 |
6.4 |
132.1 |
132.2 |
9 |
135.7 |
141.6 |
5.9 |
131.6 |
132.9 |
10 |
135.9 |
141.8 |
5.9 |
132.6 |
134.6 |
11 |
135.3 |
141.2 |
5.9 |
132.3 |
130.2 |
12 |
|
|
|
132.9 |
|
13 |
|
|
|
131.5 |
|
|
profile |
---|---|
1.5m |
132.3 |
3.9m |
133.1 |
4.9m |
131.8 |
5.9m |
133.4 |
7.0m |
133.8 |
8.0m |
134.3 |