While I was flagging a 40 line yesterday; I intended to leave my Topcon GR-3 collecting data on a corner in the woods for which I already have good coordinates. My plan was to collect several hours of static data and see how it compares. The canopy was quite heavy, but, to my surprise; I got a fix before I had completed my set-up. So, I took a shot. Then I collected raw data for 95 minutes (intending to check with and OPUS-RS solution). I am running Survey Pro and when I returned the rover was fixed and averaging 384 epochs; so I saved that shot.
Now, back at the office; both of my fixed shots are within 0.12' of record coordinates for this point. The two fixed shots vary by 0.075' from one another. My OPUS-RS solution, however, is off by 0.3'.
Do you think an 8+ hour OPUS-S solution would have been better. Or is this simply because Survey Pro uses Glonass in the solution and OPUS does not?
I'm trying to refine my "lie detector" for RTK under canopy. Opinions?
(I tried to post a pic, but, no luck)
If you are interested in a science project, collect a six to eight hour session with the rover under canopy. Set your base and any other static receivers nearby (the more the merrier). You can test how longer sessions may improve the position by chopping them up into 2-hour sessions. You can then post-process and get OPUS-S solutions of each 2-hour session and compare to the six to eight hour session.
If you are an OPUS-Projects manager, I'd run the shorter sessions through it also. From my work, I've found that all-day sessions under canopy can produce accurate positions. In short, the longer the occupation the better the results are. In part, that is because of the changes in the GPS constellation.
KevinFoshee, post: 445880, member: 8314 wrote: (I tried to post a pic, but, no luck)
https://surveyorconnect.com/community/threads/how-to-post-images-and-other-files.323430/
