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Hey Gus!

I have faced with a problem at site surveying by Leica TS11, no traverse are created but reading change points with 1-4 mm horizontal accuracy the area are about 20Hrs,

the problem is when i come back surveying the site to the start location the objects and change points reading again show about 20-70 cm relocation!!!  I do not know how it happened and the surcease as well how to solve it now???

any solution way will be appreciated and welcomed. 

regards 

This Content Originally Published by a land surveyor to Land Surveyors United Network

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-The first possibility is that a point was disturbed.

-Secondly, check your data to be sure scale factors, projections, and datums are EXACTLY the same.

- Check the specs on your prisms and which ones were placed where.

- Of course, consider operator error, poor instrument or reflector setup.

The solution is not obvious given the limited data. 
The old carpenter's saying, "measure twice; cut once" can be very important in surveying as well. Make sure two sets of observations agree before acting on them. If they don't agree, take another set of observations.

Good luck,

JAC

Thanks  J. Anthony Cavell 

as you said  measurements, so we have measured twice the control points but in both we faced mass mach location of objects were in the first location that were surveyed first. 

Mr. Salem,

I'm sorry; I don't understand your meaning. Please explain to me again.

JAC

Dear J. Anthony Cavell 

I said we have measured survey control points ones again in the site and in the second round as well we faced this problem, relocation of objects than the first round, during measurement the accuracy in each station setup was 1-4 mm you think of about 18 station setups were made, now in the result it shows 20-60 cm relocation in objects and control points than the first step surveying!!! 

Dear Mr. Salem,

Are you surveying radially from a single point, shooting other points from one setup?

Are you surveying radially from a few points, shooting other points from only a few setups?

Or are you running a traverse through the points, closing back on the beginning?

JAC

Dear  J. Anthony Cavell

We have installed few points trough out the site, shooting other points around from mentioned installed points. 

I'm sorry I cannot offer an solution. I cannot find a cause for your problem. I probably would have to witness the situation personally to find the cause.

JAC

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