Offset Survey

I'm sure someone will jump on your question soon. Many do not realize you are on the opposite side of the Earth from most of us and that English is not your first language.

We sometimes have difficulty understanding one another with common things. Perhaps this post will jump back to the top and someone will take this opportunity to comment in a meaningful way.

sory for may bad english..hopefuly..thanks a lot sir..offset survey..just share anything regarding to this words

I'm a bit unsure what you are asking.
My use of word "offset" would be the observed or calculated distance of points (1-4) from your traverse lines between Station A to B or A - D.
But I could also see it used it to describe your stations as shown, where you setup at A "offset" (away from) from the plate with points 1 to 4 measured to as shown in your diagram.
If I was wanting checks, I would setup on D and observe, = radiate, = measure to those same points as shown off A.
I'd also like to close my traverse as a check.
Is this what you're after? An "ironclad" guarantee of best possible accuracy of position of those points?

Don't be put off by any language barrier. I often throw in a few odd ones (words) that they struggle with.

I think what he is doing is measuring the offset between the GPS antenna on top of the aircraft and the Lidar sensor inside the plane. I have done this before for several clients. Some call it the "lever arm". This information is used in airborne GPS processing. When I did it in the early or mid 90's, there were no IMU's, so the camera was locked down and we also had to tie in the axis of the plane. In reality the A B C D stations don't matter, it is the relative vector from the antenna to the camera or lidar sensor. So we would just assign random coordinates, survey everything in, and then inverse the coordinates to get relative positions.

anifharun, post: 325939, member: 9821 wrote: Dear all may concern.

can share with me what is exactly definition for offset survey?

case 1:
i have a new sensor plate. On that plate contains a few instrument that related to the LIDar Survey.
Each components located on their own position on the plate.
and now my task is to do the offset survey for the whole plate in order to determine the correct position for all the equipment on the plate.

So the first thing is to establish a few of ground point( traverse station) in order to observe all the observable point on the plate.
this the roughly situation I've shared with u.

Please let me know if im wrong.
kindly suggest me another proper way base on
your pass project and experience.

Regards
anif

Depends on your equipment and the specifications of the job. What you show is a radial location. That's probably an okay way to do it if you are using a 3" or better theodolite and I'm guessing on the specifications you need to meet. With older and less precise equipment you would want to set points at the correct distance online between the control. Then set up on those points, backsight the farthest control, double center the angle and measure the distance. If the control is less than 400' or so apart, then you would want to extend control points out farther before you proceed. This was sometimes referred to as offset surveying or something along those lines. I corrected a lot of problems with radial locations 1980's-90's when folks were transitioning to edm measure but still using a 30" or 1 minute gun and not even doubling angles.

John Hamilton, post: 326131, member: 640 wrote: I think what he is doing is measuring the offset between the GPS antenna on top of the aircraft and the Lidar sensor inside the plane. I have done this before for several clients. Some call it the "lever arm". This information is used in airborne GPS processing. When I did it in the early or mid 90's, there were no IMU's, so the camera was locked down and we also had to tie in the axis of the plane. In reality the A B C D stations don't matter, it is the relative vector from the antenna to the camera or lidar sensor. So we would just assign random coordinates, survey everything in, and then inverse the coordinates to get relative positions.

yeah..this what i mean.. so..it is possible to me ask some question regarding to this level arms survey sir?
hopefully i can gain some information and knowledge from you sir..here is my working email anifharun@gmail.com ..we can go trough by email for further discussion and conversation.

Thanks a lot sir.

John knows what he's talking about. He's a world traveler also. I hope you two get connected.