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.
Apologies for any errors - I was one of my first videos to upload to RU-vid. Check out my other video for booking the angles from a 4 point closed traverse using measured values. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-igFLqsEuTHU.htmlsi=8Ot7bHyg17HX1EwD then there’s part 2 for calculating the mean and then corrected angles. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yjiLb_gQiUQ.htmlsi=4sMVddJJQjJABK88 - there’s a playlist with all the series of videos needed to complete the coordinate calculations as well. Thank you
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.
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.
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?
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.
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.
