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Traverse Adjustment problema

  • 1.  Traverse Adjustment problema

    Posted 09-07-2022 16:29
    Scenario:  We have 20 leg traverse that we need to adjust.  However, it wont adjust in TBC. I get the " traverse adjustment could not be computed: no coordinate changes have been applied.  The end station position and end foresight are unknown.  I assure you, they are not unknown and they are entered but it just wont adjust at all.  We hardly ever run traverses and I can't remember the last time I adjusted one.  I want to use TBC because it what we use to process all our data.  I've scoured the internet but none of the adjustment routines explain the proper way to collect the data.  

    For instance, we started with the Instrument at 308 with and initial BS to 306, each with established coordinates.  When we get back to 306 during the traverse do we number the point 306 or do we establish a new #? Same question for the closing angle to 308?  I've uploaded the files to a OneDrive link here:  
    https://1drv.ms/u/s!AqqmtWqSCl_0gbhn9eJaImONAdsQkQ?e=6RkuJ8

    Can anyone out there help or provide guidance on this as the TBC help files don't explain the field side at all?
    ​

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    Mike Hathaway
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  • 2.  RE: Traverse Adjustment problema

    Posted 09-08-2022 00:14
    Edited by Albert Olivier 09-08-2022 00:18
      |   view attached
    Hi Mike

    When you get back to point 306 you must keep the name 306, no need to give it a new name as TBC will not know that your are now measuring in a known point. Same for the closing angle, keep the name 308 so that TBC knows this is you known point that your measuring in. I changed a few point names in TBC and got the transverse to calculate, just as an test. Here is screen shot of the traverse after my changes. Let me know if you need more help.

    Regards

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    Albert Olivier
    TBC Technical Product Manager
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    Original Message


  • 3.  RE: Traverse Adjustment problema

    Posted 09-08-2022 20:34
    our workflow uses a new point number for the second time something is measured to in the field. this way we can check any misclosure. then in tbc we change the point numbers to the originally tied number and merge the points. you can tie with the same number in the field but will need to be aware that you will either average the two ties and can check misclosure then or you can store another observation to the same number and i think Access software will default to the original measurement for any computations for that field file. this saves the hassle of merging points in the office. 

    running a point derivation report on a point in tbc will show what measurements have been made to that point, but i would say it is not obvious how the observations are organized because they are divided up with a special tbc name assigned to each measurement. 

    we typically do the same with rtk ties to conventional points as well, or vis versa(rename and merge them). then use the network adjustment and not the traverse adjust command, usually fixing our base station location.

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    ian bissonnette
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    Original Message