Gross errors in measurements will manifest themselves in a traverse misclose. These gross errors are typically a distance and/or bearing error. How would you identify individual bearing and distance measurement errors by analysing a traverse misclose.
This Content Originally Published by a land surveyor to Land Surveyors United Network
Please let me know for what kind of misclosure you require, whether its for closed or open traverse. I can send you the excel template accordingly.
A Murali babu
Dear Mr. Win,
A first test is to draw out the traverse in one direction.
Then draw it out in the reverse from the end to the beginning.
Frequently the graphics will indicate to you whether the error is linear or angular.
truly, I have never come across this your method of identifying errors in the the distance/and or bearing measurements.
Could you please explain better with the aid of a drawing.
Your profile reads, in part,
"Licenses, Certifications or Awards
Surely with 10 years experience you have had the occasion of drawing a survey. Simply draw the survey as if it goes from the start to the finish. Then draw it backwards. Then observe at which leg(s) the two diverge, either by length or direction.
Check any surveying text book. This involves no more than elementary coordinate geometry.
PFA Files as required by you.
A Murali babu
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That's interesting. I never learned that one. Thanks.
I think both you and Charlie are both right to say to get back out there and re-measure. I find it hard to understand how people would get gross errors with the instruments that we have today unless there was a problem with the instrument in question. I have actually posted a video of an application that I wrote for Android mobile phones in which you can quickly plug in all your observed traverse data (Meaned angles of course) on site. This app will calculate angular miss-closure, coordinate miss closure. If you are happy with the results the app will then balance the angles and if necessary apply the bowditch correction rule to finalise coordinate precision. The data can then be copied and sent out via the devices share function. All this can be quickly rattled out before you leave the site so if there are any errors that can be dealt with on site, they can be sorted there and then. Not sure why but people here have have not really bothered to show an interest in the app.
To anyone reading this reply please have a look and I would be grateful if you could give me some feed back