Looking for a bit of peer review... (error propagation)

The3rdDimension · 2022-12-07T22:15:00Z

?ÿ Hello, earlier this week I made a thread asking for advice on some equations for determining the random error of a total station measurement. I've spent a few days going through textbooks and looking at papers online and think I've come up with a worksheet (attached .xlsx file) and explanation (attached .pdf file) that seems to do what I set out to. ?ÿ If you open the spreadsheet, the front page is editable, input your survey measurement values and instrument/equipment specs and it will kick out the random error propagated from those measurements and instrument specs. ?ÿ The PDF explains the equations I used and assumptions I made. ?ÿ The goal in making this was to help explain to less experienced field techs the actual error we can expect from our measurements. It's a pet peeve of mine when someone sets up and does a check and by chance it lands within 1mm of the given coordinate that they assume they are now surveying to within 1mm on every subsequent shot. I see this far too often and am hoping I can use this worksheet as a teaching aid. It could also be useful to explain to clients how their +/- 1mm accuracy request may not be realistic & to determine what equipment/methodology is needed given a realistic required survey accuracy. ?ÿ If you see any issues with the equations or my assumptions please let me know and if I agree than I will make the changes and upload the spreadsheet to my website where it will be available to anyone for free. I still have some data entry to add more prism types and I am debating whether or not to add cells to take into account existing control error. ?ÿ I really appreciate any that take the time out of your busy schedules to go through this.

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Strictly Surveying

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The3rdDimension

(@bc-surveyor)

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?ÿ

Version 1 is all done. I may revisit this in a few months with some ideas I have for additional features.

?ÿ

Attachment : Survey_Buddy.xlsx

?ÿ

Posted : December 20, 2022 12:15 pm

jaccen

(@jaccen)

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Thanks for all your hard work!?ÿ I will give it a try over the holidays.

Posted : December 21, 2022 9:54 am

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Looking for a bit of peer review... (error propagation)

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