Reading RPLS is free for the whole profession. Members post, reply, and get the members-only rooms.
Notifications
Clear all
Topic starter
Translate
▼
English
Spanish
French
German
Italian
Portuguese
Russian
Chinese
Japanese
Korean
Arabic
Hindi
Dutch
Polish
Turkish
Vietnamese
Thai
Swedish
Danish
Finnish
Norwegian
Czech
Hungarian
Romanian
Greek
Hebrew
Indonesian
Malay
Ukrainian
Bulgarian
Croatian
Slovak
Slovenian
Serbian
Lithuanian
Latvian
Estonian
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)
Posted : September 8, 2017 11:04 am
Translate
▼
English
Spanish
French
German
Italian
Portuguese
Russian
Chinese
Japanese
Korean
Arabic
Hindi
Dutch
Polish
Turkish
Vietnamese
Thai
Swedish
Danish
Finnish
Norwegian
Czech
Hungarian
Romanian
Greek
Hebrew
Indonesian
Malay
Ukrainian
Bulgarian
Croatian
Slovak
Slovenian
Serbian
Lithuanian
Latvian
Estonian
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.
Posted : September 8, 2017 11:26 am
Translate
▼
English
Spanish
French
German
Italian
Portuguese
Russian
Chinese
Japanese
Korean
Arabic
Hindi
Dutch
Polish
Turkish
Vietnamese
Thai
Swedish
Danish
Finnish
Norwegian
Czech
Hungarian
Romanian
Greek
Hebrew
Indonesian
Malay
Ukrainian
Bulgarian
Croatian
Slovak
Slovenian
Serbian
Lithuanian
Latvian
Estonian
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/
Like what we do here? Start your Membership or Donate
Need a new or refreshed website? Websites for Surveyors
Check out my new website at Five Point Web Solutions
Posted : September 8, 2017 11:28 am