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Adjusting horizontal prism offsets

  • 1.  Adjusting horizontal prism offsets

    Posted 10-28-2021 14:44
    Is there a way to adjust the horizontal prism offset in a job file once it is imported? I have a job file where the crew shot some locations with a 0.60' offset horizontal offset and then forgot to set it back to zero. 

    Many Thanks

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    John Alexander
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  • 2.  RE: Adjusting horizontal prism offsets

    Posted 10-28-2021 18:21
    I assume your field crew were using the Distance offset measurement method in Trimble Access? If this is the case then yes you can change it in TBC. If you select the observation you can view and edit the offsets in Properties:


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    James McWha
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  • 3.  RE: Adjusting horizontal prism offsets

    Posted 10-15-2025 12:04

    When you change the offset in the properties how do you "refresh" the point so that the coordinates get updated?



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    Lou Morris
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  • 4.  RE: Adjusting horizontal prism offsets

    Posted 10-15-2025 12:04

    Thanks for the reply. I have changed the offsets in point properties but how do you get the coordinates to update after changes the offset?



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    Lou Morris
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  • 5.  RE: Adjusting horizontal prism offsets

    Posted 10-16-2025 07:20

    Depending on the type of point/observation, it can be as easy as a "recompute". This often happens automatically, but sometimes you must also manually do it. There will be a red disk (or ball) in the lower right-hand corner if a recompute is needed. You can click on that disk or hit F10 to recompute.

    If it is an as-staked point, you might have to explode it. I have been out of the field for 7 years so that one is a bit rusty.



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    Dave Olander
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  • 6.  RE: Adjusting horizontal prism offsets

    Posted 10-16-2025 07:20

    if you adjusted as other's have mentioned, you likely just need to 'compute' the project to update the coordinates. red dot on the top or bottom of the screen. f4 i think it is. 



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    ian bissonnette
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  • 7.  RE: Adjusting horizontal prism offsets

    Posted 11-01-2021 11:43
    If it's prism offset you are wanting to change, you can view and edit them through the Optical spreadsheet.

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    Robert Hoy
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  • 8.  RE: Adjusting horizontal prism offsets

    Posted 11-01-2021 15:27
    I don't think John is referring to the prism constant. Having the wrong prism constant won't make 0.6' difference.

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    James McWha
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