Land Surveyor Community Forum

Survey Data Miss match

Hey Surveyors!

I have surveyed a land about km square with complected details(roads, streets, buildings, T-Walls, Manholes, Corners etc) but with no traverse extension at the first, now when i have completed it and reached to the first area I was starting from and measuring with the data come from extension of change points in the site show me the errors in horizontal distance, EX: measuring the corner of a building which was measured at the first too,  give me the error of 10cm-even 90cm

any suggestion and salvation way well be welcomed, 

this area have surveyed by lieca TS11

it's worth mention that for salvation the problem i have measured all change points 3 times again by to TS06 and TS11, but there come different between them from 5cm to 60cm even with high accuracy doing the work!!!

as you see the picture this is the same point measured 3 times! 

ATP2, TP11C, TP25 

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  • Survey,s main things whole to the part,not part to the whole.Since you have started survey work with out traversing and vast area so traverse has not closed.If you do traversing this problem will not happen.If some error will occur so we can distribute the error in station point.You do the traversing by angle and distance method.Furthur any enquiry you can call me to my mobile no.(+91 9748870534)

                                                                           Thank you.


  • dear James Ranke,

    But i have done it by 2 different total stations, the same problem the one survey of traverse does not match to the next one exactly,

    • Need to check your glass it sounds like a prism offset setting is not properly set in the EDM.

      Do a peg test:

      Setup 3 Tripods with Tribrachs in a straight line about 50 meters apart.   1 -  2  - 3

      Set Instrument on 1 measure distance 1 - 3

      Set instrument on 2 measure distance  2 - 3 and 2 - 1 Sum of these two distances should equal the distance  1 - 3 if not there is a problem with the either the ppm or the prism offset setting in the instrument.

      If you are processing the survey with Leica LGO you can go to the processing tab and edit any of the settings that are wrong. ie wrong prism type

  • First check the culmination of the instruments and run the calibration routine.

    Check EDM ppm and prism offset settings.

    Check optical plumbs on all tribrachs

    Check level bubbles on instrument tribrachs and rods

    Run 3 tripod peg test on the instrument and all prisms used

    Use Forced Centering Traverse Method for Instrument points. Check yourself by using Resection.

    Sounds like an EDM settings problem.


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