Using Topcon Tools I post processed 16 points collected with 1 base and 2 rovers that collected simultaneously. This was done 6 times, each time using identical parameters and identical data. Yet, each time different vectors where identified as being "bad" and different positions were calculated for various points. I would expect the software to produce identical answers each time. Identifying the exact same vectors as being "bad" and calculating the exact same positions for the points. Does anyone have an answer as to why this occurs? Or even speculation or theories on how the program can produce differing results using identical data and identical parameters? Thanks, Lloyd
Leveled,
Deral has a good bit of experience with Topcon Tools. You might want to get in touch with him.
Jimmy
Topcon Tools Postprocessing ?
Is this one set of observations you post processed in a different sequence, or multiple sets of observations?
If it is multiple sets and even if it is not you want to exclude all the vectors that do not overlap for a reasonable length of time. Usually those are rover to rover vectors. If you want to post process rover to rover vectors then you must carefully coordinate your start stop times. This problem is not peculiar to Topcon Tools and occurs in all post processing.
Post processing is an iterative process and is dependant on what is processed first.
Paul in PA
Topcon Tools Postprocessing ?
There is sufficient simultaneous data collected time wise between all the vectors. Essentially there are 8 BASE-ROVER-ROVER triangles (16 unknown points occupied by the rovers, 1 known point occupied by the base). What troubles me is that the processing program is giving me different answers with the exact same static data and the exact same parameters.
I'm essentially inputting static epochs of data and asking the program to compute positions based upon my defined parameters. This process should produce 1 unique result. Granted some of the positions may not be fixed or have solutions we would not want to use or rely on.
But when I repeat the process (software processing of the collected epochs) I should get the exact same results. I have repeated the process 6 times and gotten 6 differing results.
I'm looking for insights into how the program can evaluate the data differently each of these 6 times without any of the raw data inputs changing and without any of my specified parameters changing. Thank you for your replies and any insight you might have.
Topcon Tools Postprocessing ?
Have you designated the point that the base was set on as a fixed point to control the position of the other points?
Topcon Tools Postprocessing ?
Yes the base has been held fixed.
