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Read This First

There is a row in the table for each sonic at each site. The first column is the site, the second is the nominal height of the sonic, and the third is the type of sonic. The first three columns, the ones in bold, should not change.

If a sonic is not actually at the nominal height, you can edit the actual height field for that sonic, but initially all the actual heights are filled in with the nominal height.

To record the horizontal orientation of a sonic, measure the bearing of the boom relative to magnetic north looking along the boom towards the tower. In the measurement columns on the right, record the measured bearing, who made it, and any other relevant notes, like how it was made. For example, 99 deg, gg, handheld compass, 12/15/2016. If there is more than one measurement for a sonic, then more than one measurement column will be filled in. Finally, derive the best approximation for the boom angle from all the measurements and enter it in the Bearing column. Derive the angle as an average, or just pick the most reliable measurement.

Usually all the sonic booms on a tower have the same bearing, in which case you can copy one measurement to all the heights at that site.

The sonic type should be enough to indicate how the sonic is mounted relative to the boom, as indicated in the table below. If a sonic is not mounted according to the conventions below, then the boom angle bearing in the table needs to be adjusted accordingly. For example, if a sonic is rotated 180 degrees from the conventional orientation, then add 180 degrees to the boom angle and note that in one of the the measurement columns.

Sonic TypeMounting relative to boom
RMYoungBlack wiring box points towards tower in line with boom
MetekArrow on side points away from boom (confirmed by Dan in comments below)
Gill 3D

All the Gills were mounted by DTU and ARL, and we assume they were oriented to north, so the boom angles below are left empty, suppressing any correction.

Entering zero would still apply the magnetic declination adjustment, so better to leave them blank.

CSAT3White box above the boom, lettering upright
CSAT3A (EC150)Mounting post inserts into end of boom, cable exits head beneath boom

This table is scraped by a script to extract all the angles and generate calibration files for NIDAS processing, so the layout should not change and the meaning of the columns should not change. Other than that, edit it like you would any other wiki page.

Sonic Angles Table

The boom angle is the bearing of the boom pointing away from the tower relative to magnetic north, in units of degrees. If you shoot the angle looking along the boom towards the tower (ie, so the tower is not obstructing the view of the boom), then add 180 degrees to get the boom angle expected in this table. Initially we just need rough estimates in this table.

 

rne01HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0110mCSAT310    
rne02HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0210mRMY8100010    
rne0220mRMY8100020    
rne03HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0310mCSAT3A10    
rne04HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0410mRMY8100010    
rne05HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0510mRMY8100010    
rne0520mRMY8100020    
rne06HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0610mCSAT310    
rne0620mCSAT3A20    
rne07HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rne0710mCSAT3A10    
rne0720mCSAT320    
rsw01HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0110mMETEK10    
rsw0120mMETEK20    
rsw02HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0210mRMY8100010    
rsw0220mRMY8100020    
rsw03HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0310mGill3D10    
rsw0320mGill3D20    
rsw0330mGill3D30    
rsw0340mGill3D40    
rsw0360mGill3D60    
rsw04HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0410mCSAT3A10    
rsw05HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0510mMETEK10    
rsw06HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0610mGill3D10    
rsw0620mGill3D20    
rsw0630mGill3D30    
rsw0640mGill3D40    
rsw0660mGill3D60    
rsw07HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0710mCSAT310    
rsw0720mCSAT3A20    
rsw08HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
rsw0810mMETEK10    
rsw0820mMETEK20    
tnw01HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw012mRMY810002    
tnw0110mRMY8100010    
tnw0120mRMY8100020    
tnw02HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw022mRMY810002    
tnw0210mCSAT3A10    
tnw0220mCSAT320    
tnw03HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw032mMETEK2    
tnw0310mMETEK10    
tnw04HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw042mRMY810002    
tnw044mRMY810004    
tnw046mRMY810006    
tnw048mRMY810008    
tnw0410mRMY8100010    
tnw0412mRMY8100012    
tnw0420mRMY8100020    
tnw05HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw052mRMY810002    
tnw054mRMY810004    
tnw056mRMY810006    
tnw058mRMY810008    
tnw0510mCSAT3A10    
tnw0512mRMY8100012    
tnw0520mCSAT320    
tnw06HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw062mRMY810002    
tnw064mRMY810004    
tnw066mRMY810006    
tnw068mRMY810008    
tnw0610mRMY8100010    
tnw0612mRMY8100012    
tnw0620mRMY8100020    
tnw07HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw074mRMY810004    
tnw076mRMY810006    
tnw078mRMY810008    
tnw0710mGill3D10    
tnw0712mRMY8100012    
tnw0720mGill3D20    
tnw0730mGill3D30    
tnw0740mGill3D40    
tnw0760mGill3D60    
tnw08HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw082mRMY810002    
tnw0810mRMY8100010    
tnw0820mRMY8100020    
tnw09HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw092mRMY810002    
tnw0910mCSAT310    
tnw10HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw1010mGill3D10    
tnw1020mGill3D20    
tnw1030mGill3D30    
tnw1040mGill3D40    
tnw1060mGill3D60    
tnw11HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tnw112mRMY810002    
tnw1110mRMY8100010    
tnw1120mRMY8100020    
tse01HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0110mCSAT3A10    
tse0130mCSAT330    
tse02HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0210mCSAT3A10    
tse0230mCSAT330    
tse04HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0410mGill3D10    
tse0420mGill3D20    
tse0430mGill3D30    
tse0440mGill3D40    
tse0460mGill3D60    
tse0480mGill3D80    
tse0480mGill3D80    
tse04100mGill3D100    
tse05HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0510mCSAT3A10    
tse0520mCSAT320    
tse06HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0610mGill3D10    
tse0620mGill3D20    
tse0630mGill3D30    
tse0640mGill3D40    
tse0660mGill3D60    
tse07HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0710mCSAT310    
tse0720mCSAT320    
tse08HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0810mMETEK10    
tse0820mMETEK20    
tse09HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse0910mGill3D10    
tse0920mGill3D20    
tse0930mGill3D30    
tse0940mGill3D40    
tse0960mGill3D60    
tse0980mGill3D80    
tse09100mGill3D100    
tse10HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1010mMETEK10    
tse1030mMETEK30    
tse11HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1110mGill3D10    
tse1120mGill3D20    
tse1130mGill3D30    
tse1140mGill3D40    
tse1160mGill3D60    
tse12HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1210mCSAT310    
tse1220mCSAT320    
tse13HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1310mGill3D10    
tse1320mGill3D20    
tse1330mGill3D30    
tse1340mGill3D40    
tse1360mGill3D60    
tse1380mGill3D80    
tse13100mGill3D100    
tse14HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1410mCSAT310    
tse1420mCSAT320    
tse15HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
tse1510mMETEK10    
tse1520mMETEK20    
v01HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v012mCSAT32    
v0110mCSAT310    
v02HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v022mMETEK2    
v0210mMETEK10    
v0220mMETEK20    
v03HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v032mCSAT3A2    
v0310mCSAT310    
v04HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v042mCSAT32    
v0410mCSAT3A10    
v05HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v052mMETEK2    
v0510mMETEK10    
v0520mMETEK20    
v06HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v062mCSAT32    
v0610mCSAT310    
v0620mCSAT3A20    
v07HeightSonicActual (m)Boom angle (degrees)Measurement OneMeasurement TwoMeasurement Three
v072mCSAT32    
v074mRMY810004    
v076mRMY810006    
v078mRMY810008    
v0710mCSAT310    
v0712mRMY8100012    
v0720mCSAT3A20    
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4 Comments

  1. You could enter the rough estimates that I did, documented in my 13 Apr blog, with values entered in cal_files/noQC for all sonics (except Gills, that seem to have been oriented to north by INEGI and DTU during installation).

     

  2. Also, the "official" boom angles for this project are supposed to be derived from the complete set of laser theodolite measurements, which we are supposed to work on during operations, and which will include our "multistation", along with 2 others from DTU.  I assume that Per and/or Robert will coordinate this.  Thus, I don't think we need to kill ourselves with compass shoots, though at least one attempt would be great.

  3. Confirmed for the Metek, the north arrow pointed away from the tower parallel to the boom

  4. Thought I'd include an email exchange I had with Robert Menke about the multistation scan results:

    me: As I understand it, for each sonic, you scanned 2 points on the boom, roughly horizontal (p1, p2) and two points on what I'll call the riser of the sonic head, roughly vertical (p3, p4).  From the projection of p1-p2 on the x-y plane, you get azimuth.  From the projection of p1-p2 on the x-z plane (with x aligned with the boom), you would get what I call the pitch angle.  From the projection of p3-p4 on the y-z plane, you should get what I would call the roll angle and from the projection of p3-p4 on the x-z plane, you should get a redundant measure of pitch (assuming that Samortecnica's welding of the boom riser was perfectly a right angle).

    Robert: We investigated roll and redundant pitch, but realised that the uncertainties on p3 and p4 are too high to derive meaning full results from it. Due to the geometry of the sonics we had to place the measurement points close to each other, for the Gill sonics they are both on the lower part of the riser about 300mm apart. We ended up to only use the mean value of p3 and p4 to determine the global position of the sonic in the x-y plane (neglecting the displacement from the center position by the radius of the lower raiser).