Theodolite - Measuring Angles

[@Coronel62]

Thank you for your lecture. Compared to many beginners courses in English language I enjoyed you took your time to explain the neccesary details to reach the so neccesary correct readings. Though I have a some questions. Question # 1: Electronic theodolites can change the horizontal presentation in Captal letter H with index letters "l"or "r." Why is this and how does that relate to the action of turning around the telescope and the theodolite 180 degrees (turning the theodolite around its vertical and horizontal axis180 degrees); Question 2: When we want to measure more poins, like Rowena asked about, how do we measure them? First do a 2 point with your proceedings in order to estabish how fine the readings of the theoudolite is and the do the same fore each of the 6 points? My guess is when I measure from 1 point (like for a building) I measure with the proceeding for face left and face right each point. When measure over long distances I do one face left and one face right for 2 pont in orde to know how accurate my theodoliet is. After that I wound do a run like a closed travers. How would do you advise? This would be interesting ground for a follow up course.

[@applied-maths]

Alex thank you for your comments and to answer your questions. Q1 - The L and R relate to the direction of rotation when you measure a horizontal angle. Normally I would measure horizontal angles in the clockwise rotation direction and then dealt with calculation based on those measurements. You may wish to swap the direction to anticlockwise so that you can measure the acute version of an angle rather than the reflex version of the same angle - if you search, angles, reflex and acute you'll see what i mean. Q2 - I need a little more explanation - are you bring to measure several angles at the one station and then looking to correct these??? If so, there is a process of least squares estimation for doing this but i want to make sure that I'm answering your question correctly before uploading a video. To explain the process, say you are trying to measure 3 angle (a, b and c), all from one station. First I would measure them individually first. Then i would measure the angles in combination i.e angle a and b together then angles b and c together and finally the angle a and b and c all together. Then with the least square estimation method, then you can mathematically determine their individual values. If this sounds about correct, let me know and can produce you video on this mathematical procedure.

[@mathmandrsam]

A quick question, if you know the answer... I have a theodolite with a laser plummet. However, the tripod has a plumb bob hook inside the tripod screw. This works well for when I attach a plumb bob. However, this interferes with the laser dot which becomes quite blurry and poorly defined. What do people do in this situation?

[@applied-maths]

There are two solutions either 1) remove the hook for the plumb bob - I’ve done this for many of the tripods that I use. I use the optical plummet when setting up over a point, or 2) use some tape or a cable tie to hold this hook out of the way so that it doesn’t interfere with the laser. Use something like masking tape that’s cheap and easy to remove. Note depending on your tripod, the more modern ones have a plastic hook for the plumb bob which will click to one side and stay out of the way.

[@mathmandrsam]

@@applied-maths Many thanks - you have been very helpful! Subscribed!

[@craig7878]

The final angle shown on the total station was also 179 degrees... but when you were doing the calls, you wrote it as 180 degrees. the minutes and seconds were also different.

[@applied-maths]

Apologies for any errors - I was one of my first videos to upload to KZbin. Check out my other video for booking the angles from a 4 point closed traverse using measured values. kzbin.info/www/bejne/n5ipfaSpetqHfrcsi=8Ot7bHyg17HX1EwD then there’s part 2 for calculating the mean and then corrected angles. kzbin.info/www/bejne/r5vMfZWVnLaci7Msi=4sMVddJJQjJABK88 - there’s a playlist with all the series of videos needed to complete the coordinate calculations as well. Thank you

[@ngangakantony]

Great vid 🎉

[@applied-maths]

Thank you - glad you found it helpful.

[@rowenaquisay3140]

What about bearing and distance from one object to two or more objects pls examples sir...thanks

[@rowenaquisay3140]

Sir if i want to locate the landmark of a lot of 6 corners,what is the first step?I have a digital theodolite LDT-02 thanks gobls

[@applied-maths]

Thank you for your question. Do you mean that you wish to complete a 6 point closed traverse??

[@M.H312]

What model theodolite is this ❓

[@digitalsurveyor]

Topcon Digital Theodolite DT-106

[@applied-maths]

Topcon Digital Theodolite DT-106

[@thomaspethe9554]

?Im student..im look for user tutorial.I am a little confused. You looking at a optic prism reflector on a theodolite that does not work with a prism refector? Out on the field this type of theodolite is used in conjunction with measuring staff and read off stadia line. True?? Any who thank you. Liked and subscibed..

[@applied-maths]

Yes this theodolite can be used with the stadia lines on a survey staff. Typically the distance from the instrument to the rod can be determined quickly by subtracting the bottom stadia reading from the top reading and multiplying the difference by 100. However please pay attention, the stadia distances have a low level of accuracy, a one mm error in staff reading gives a distance error of 0.1 metre

[@evansgborglah8650]

Thank you very informative

[@applied-maths]

Glad it was helpful!

[@hangas-s1507]

Thank you

[@applied-maths]

You're welcome

[@dooshimaaguh6816]

I am an ND 1 student of a college in Nigeria pls can u break down dis face left and right for my assimilation?I Ve idea but not much

[@applied-maths]

Thank you for your question. Sorry but I do not understand your question. Can you reword your question so that I might be able to assist.

[@OGTennyson]

Baba😂🤝

[@craig7878]

You said the third angle is 118 degrees... It shows 218 degrees... ?

[@applied-maths]

218deg is the correct angle. It is used at the end to calculate the average angle.

[@craig7878]

But apart from that, your videos are very very good

[@applied-maths]

I appreciate that!

[@exequelgarcila2215]

Thank you so much this was very informative!

[@applied-maths]

Thank you - glad it was helpful.

[@saritakatuwal507]

Thank you so much ❤

[@lubingaporteouskibuuka1971]

Thanks

[@EpicShowDailyOfficial]

amazing

[@applied-maths]

Thank you!

[@shankylezapanta1464]

Thank you so muchh

[@applied-maths]

You're welcome!

[@husseinabdo2555]

Thank u so much sir

[@applied-maths]

Thank you - hope you found it useful.

[@yolandaeric-ms2yl]

Hello

[@3FOURthree4]

I have headsets on, volume max, but I can't make out the words in the voice over recording 😢

[@applied-maths]

Thanks for your feedback- I’ve progressed quite a distance compared to my first videos. Good audio is key to a successful video. I may just have to redo this one for a better learner experience.