> can anyone share the tips and trick or the easy way to find the means value of vertical angle?
>
> case : we have two values of vrtcal angle which are
> face left : 89 36 50
> face right : 270 23 27
>
> by refereing to that value,,any easy trick and tips to find out the means of that vertcal angle.
>
> thanks for the info
anifharun:
Welcome!
Since no one has mentioned it yet, if you're setting up your instrument (is it the GTS 701?), and you're getting this large an error between face left and face right, you really should perform the "Calibrate Vertical Datum = 0" on your instrument. A difference of more than 25' is way too high. If it is the Topcon instrument and you haven't found the manual, let us know, we'll provide instructions.
If it's another instrument, I'm sure there is an equivalent adjustment and others here will be happy to help.
do you means face left and right just for horizontal angle and direct and reverse for vertical angle?
thanks boss..its very helped me..just to find the easiest way to that computation. that why i asking in this forum..
thanks for sharing.
> anifharun:
> Welcome!
> Since no one has mentioned it yet, if you're setting up your instrument (is it the GTS 701?), and you're getting this large an error between face left and face right, you really should perform the "Calibrate Vertical Datum = 0" on your instrument. A difference of more than 25' is way too high. If it is the Topcon instrument and you haven't found the manual, let us know, we'll provide instructions.
>
> If it's another instrument, I'm sure there is an equivalent adjustment and others here will be happy to help.
Maybe no one else has mentioned it is because there's only 17" difference between D and R -> which is within 10" of the mean- not too shabby for a single set of Zeniths- depending on the distance to tgt, type of tgt and a myriad of other environmental factors......
just sayin'- [sarcasm]but go ahead and send him a manual.....
[/sarcasm] :snarky:
No One Answered His Question
He wants the Easy way to mean angles. I know no easy ways to do straight forward mathematics.
Plus we have no way to know if he knows what he is talking about. One might assume he is reading a vertical circle but on what kind of instrument. If an electronic instrument most reading values be changed to other formats.
One cannot mean the two angles he has listed.
One can mean Zenith Angles, the questioner has listed one Zenith Angle and needs to do the math to get a second Zenith Angle, then one can mean two Zenith Angles.
One could also mean two Elevation Angles above the horizon.
For the question shown I will give a hint:
0° = 360° = 360°00'00" = 359°60'00" = 359°59'60" all of which indicate the Zenith.
For the 89°36'50" reading the Zenith Angle is the difference between 89°36'50" and the Zenith or 0°, 89°36'50" - 0° = 89°36'50"
For the second reading the Zenith Angle is the difference between the given reading and the Zenith. Understanding that the difference is obtained by differencing the smaller from the larger value, i.e. 359°59'60" - 270°23'27" = 89°36'33"
89°36'50" and 89°36'33" can now be meaned.
Paul in PA
> Maybe no one else has mentioned it is because there's only 17" difference between D and R -> which is within 10" of the mean- not too shabby for a single set of Zeniths- depending on the distance to tgt, type of tgt and a myriad of other environmental factors......
>
> just sayin'- [sarcasm]but go ahead and send him a manual.....
> [/sarcasm] :snarky:
Sorry; correct. Mis-read another post. Still not a bad idea to perform the Vertical Datum=0 routinely. I've read that some do it at the start of each day.
yes sir..im using Topcon GTS 701 right now.
from my calculation, i got the error value is about 0 0 17 ..it is ok or not? its still in tolerance spec?
my pleasure sir if you can send to me the user manual for this TOPcon GTS 701.. currently i tried to find that mannual.
kindly email to me anifharun@gmail.com once you got that mannual sir..
special thanks for you sir..
Malaysia?
I'm guessing our guest is from Malaysia.
"ANif HaRun, Universiti Teknologi Malaysia - UTM, Department of Geomatic Engineering, Undergraduate."
Yes there are different guidelines for different instruments. Knowing what they are and what is needed for the conditions you're operating in and the results you are attempting to achieve does take some study of the instrument's functions and experience.... I used to use an old set 3 that if you had it set to auto index the vertical circle, your difference between D & R zeniths would be in the neighborhood of 3 minutes. If you manually indexed the circle the difference was about 7 seconds. You had to manually index every time you turned the instrument on....
Your Kidding, Right?
:good: Good one
Malaysia?
yes i am sir
> do you means face left and right just for horizontal angle and direct and reverse for vertical angle?
"face left" and "face right", are the same as "direct" and "reverse"
face left, and direct refer to using the instrument in the standard mode, usually with the controls on the right for azimuth and facing the user for elevation.
face right and reverse refer to flipping the scope and turning it 180 degrees also.
Malaysia?
Be sure and keep posting questions here. I always learn a little bit each time these types of questions are asked. As someone else mentioned, many times there are more than one way to arrive at the same answer.
You will find that some people here tend to forget that there are all levels of education and experience represented here. You just have to have patience.
Math Teacher;
There are several ways to reduce measured Zenith Distances. Norman is so close you might as well say he is correct.
The formula is;
Z = [(360-ZR)+ ZD]/2 or you could write it as Z = 1/2(ZD+360-ZR) ; same as the first equation; I always use the First.
Where Z is the corrected mean Zenith Distance, R is reverse, D is Direct
Now you can take the measured Zenith Distance and convert it to an angle and then mean that.
Or you can use the following formula to get a corrected mean angle;
A = [(90-ZD + ZR-270)]/2 which is also = to A=[(ZR-ZD)/2]-90
A is corrected Angle, ZD = direct Zenith distance, ZR = Reverse Zenith Distance.
Also some want to use FACE Left or FACE Right (?) I don't know about this. Its either Direct or Reverse. NOW if you use a Wild T3 then its Circle Left or Circle Right (CL or CR) and that's the way you record it. But the T3 is totally different
in its vertical circle and you do not measure a Zenith Distance nor do you measure
a vertical angle. You are really measuring a half vertical angle in either Circle Left Or Circle Right position.
JOHN NOLTON
Tombstone, AZ.
hi can you give a link to a GTS 229 that needs vertical calibration. Or better yet how to calibrate it? Is it easily done?
