I don't, it's all relative
well- technically, if you have one contour line that runs thru your county, it does simplify things.....:-P
I don't, it's all relative
Yes, that does provide some relief. (That's a joke, son, get it?)
That's a joke, boy..
Yessiree, Bob. That's the guy that taught me how to say that. I loved watching Foghorn Leghorn, especially when that tiny little chicken hawk thought he was going to take Foghorn home for supper.
Picture a vertical structure facing a ravine. The task is to monitor not only settlement but tilt or lean during a short period of construction activity. I plan to set reflective tape markers along the top of the structure and along the lower face and record data from a station opposite the ravine. The vertical face and difficulty of accessing the lower area precludes the use of a level I think.
Any suggestions are welcome however.
For traverses yes, we measure with a tape to the mark, and subtract 0.01'. We ran the numbers for instrument heights between 5.0 and 6.0 feet (our standard set ups) and we found that 0.01' would work well.
If what you're saying is true, then it's time to get the autolevel out and check some stuff.
One day you will be able to push a button and the laser will measure for you. I do like on the S6 how it has a slant spot to measure to. Just have to watch your survey style. Some people still try and measure to the center and dont realize to change that in the data collector.
Check out these targets at Bernstem http://www.berntsen.com/Surveying/Survey-Prisms/Mini-Prisms Monitoring a structure is something you don't wat to shortcut on. These targets may seem expensive but what happens if the structure fails? We do structural behavior measurements every year. We jump through all kinds of hoops to get precision. A $10,000 pillar on a $100,000,000 structure is small change.
Hello, interesting topic, I think. I Always measure Hi to the mark for the vertical axis of the instrument. I use corrections for the height of the base station when I mesure deformations only. Most of the time when I mesure the height of the instrument on the field the values are between 1.5 - 1.65 m. , When we have Hi=1.60 m, error , because of hypotenuse is 0.3 mm, which is negligible small value. Actually think about something else - by using total station we do trigonometric leveling on big distances , where errors become more big because of tropospheric refraction, where on 300 m. for example we have over 3 mm. error in ideal conditions, early at the morning. After 300 meters we have errors because of earth's curvature, and so on and so on.
P.S. if you use S6 on autotracking mode thing about tracking errors for height of measured points 🙂
It's been done but I have not bought it to try it out yet though.
Link:
http://www.horizon.sg/wp-content/uploads/2014/02/EZ-Height3.pdf