Unusual DPOS Results

Discussion in 'Javad Data Online Post Processing' started by Aaron S, Dec 20, 2017.

  1. Aaron S

    Aaron S Active Member

    I don't have any kind of cell coverage in much of the area I work in. But if I could just set up the base/radio and broadcast on the lowest power with no intention of maintaining a UHF link, I could still post process base-rover, couldn't I?
     
  2. Shawn Billings

    Shawn Billings Shawn Billings 5PLS

    Yes. You can actually do this without the radio, I believe. It's been a while since I tried this, but I think you will get a warning that there is no radio attached, but it will still complete the base rover setup process and log raw data.
     
  3. Shawn Billings

    Shawn Billings Shawn Billings 5PLS

    Your report looked good to me. All of the residuals of position were very low.
     
  4. Alexey Razumovsky

    Alexey Razumovsky Active Member Staff Member 5PLS

    I will be pleased if you point me all suspicious post-processing cases. It help us to move forward Justin post-processing service. @Aaron S please share with me 224_135756.jps.
     
  5. Aaron S

    Aaron S Active Member

    Here you go! Thanks.
     

    Attached Files:

    Alexey Razumovsky likes this.
  6. Aaron S

    Aaron S Active Member

    That is a pretty typical result doing it the way I have been. I don't remember seeing any over 2 cm overall, which is why it raised my suspicions when I saw such poor results suddenly. I'll likely end up reshooting those points just to be safe.

    I thought I tried starting the base with no radio and it wouldn't let me. I didn't try to force it or override the warning though - I'll revisit that option.
     
    Shawn Billings likes this.
  7. Shawn Billings

    Shawn Billings Shawn Billings 5PLS

    Right. I think you can do that and everything works fine.
     
  8. Nate The Surveyor

    Nate The Surveyor Well-Known Member

    One of the things that I greatly like about the LS is you get a visual of the coordinate pile when you take a shot. How much trouble would it be to make this also possible with DPOS?.
    If it used five different CORS, then, it would have 5 dots. With a line. And the station name, written.
    Or, a color code, ie, red is station, Dequeen, blue is LR. and, then the details are in the coresponding color, or just a color legend.
    It would be nice this way so that from a brief glance you could find problematic items. Like, a station, that has stability issues, or such.
    A fast pretty pic.
    N
     
  9. Matt Johnson

    Matt Johnson Well-Known Member 5PLS

    This can be done with Justin but not Justin Link. Justin Link only allows data and projects to be viewed, not processed and adjusted.

    DPOS projects can now be downloaded from app.javad.com with the JPR download button.

    upload_2017-12-21_21-10-45.png

    Then unzip and open the project in Justin or Justin Link if you only want to view the project.

    From the top menu enable View > Solutions and then you can choose desired solutions to be "Disabled in adjustment".

    upload_2017-12-21_19-39-19.png

    Then you can perform the adjustment again

    upload_2017-12-21_19-54-45.png

    and create a new report.

    upload_2017-12-21_19-56-51.png
     
    Mitchell D Lane likes this.
  10. Matt Johnson

    Matt Johnson Well-Known Member 5PLS

    DPOS processing with a static engine so there is no epoch by epoch solution or coordinate pile. (I know calling it the "PPK" solution is very confusing since it is post processed with a static engine and not a kinematic engine. I have argued many times that we should call it PPS not PPK.)

    You mean like what is already possible with Justin or Justin Link? ;)

    upload_2017-12-21_20-35-8.png
     
    Nate The Surveyor likes this.
  11. Aaron S

    Aaron S Active Member

    So for some reason all my standalone DPOS sessions which have been working all year (and really shouldn't have worked as well as they did) are coming up with lousy RMS results recently. No problem, I'll just set up my T2 base and reverse-shift them in. Well, I have coordinates two different monuments I've shot below.

    The first one, points #100 and #101 were shot using RTK (RTN internet rover) using the boundary preset method, fully verified. They agree, no issues. Skip ahead to the other station, which I also shot twice #114 and #115 using the same method. Fully verified and agreeing not quite as well, but the canopy was worse. I didn't think that second one was good enough, so I set up the base to check and reverse shift. Point #119 is the check shot from the local base, DPOS'ed, which is very close to the RTK. Point #120 is the check shot for the second station, from the same local base setup (300 seconds) - not as close.

    I guess my question is, with so many methods to collect points with Javad (DPOS, post-processed, RTK, local base, etc.), how do you compare "apples to apples" with so many variables - time, satellites, epochs, etc. all factor in. What do you look at to gauge the quality of points from a variety of sources?


    Point100.JPG

    Point114.JPG
     
  12. Alexey Razumovsky

    Alexey Razumovsky Active Member Staff Member 5PLS

    Hi Aaron, we have redeployed post-processing engine since the end of last December. I did this to meet requirements of some customers. New engine works well for them.
    Unfortunately, your approach to DPOSing was lost. Now I have a new engine that combine all benefits of current engine and process very well the files that you sent to us. I expect to deploy new engine asap.
     
    Aaron S likes this.
  13. Alexey Razumovsky

    Alexey Razumovsky Active Member Staff Member 5PLS

    I am asking for base files that bring suspicious solutions to check new engine on processing relative to CORS. The bigger , the better.
     
  14. Aaron S

    Aaron S Active Member

    Here are a couple that I thought should process ok, but didn't.
     

    Attached Files:

  15. Aaron S

    Aaron S Active Member

    Here's the second one.
     

    Attached Files:

  16. Aaron S

    Aaron S Active Member

    Alexey - I have some weird DPOS stuff going on, but the archive file is too big to post here. Is there an email I could send a Dropbox link to you?
     
  17. Matt Johnson

    Matt Johnson Well-Known Member 5PLS

    Send it to a.razumovsky@javad.com
     
  18. Alexey Razumovsky

    Alexey Razumovsky Active Member Staff Member 5PLS

    Aaron, I really need these files. I have got very good results for all files that you have sent to me before.
     
  19. Aaron S

    Aaron S Active Member

    I sent an invite via Dropbox to that address. Please let me know if you need anything else.

    The problem seems to be that some of the DPOS sessions contain the word "span" on the processing screen. For some of the rover points, it seems like they didn't get attached to the appropriate base file, so the shifts didn't apply.

    You'll probably figure this out, but when I've been out over the last couple days, I would shoot a point 3 times using RTK/RTN, then switch the profile to Triumph 2 base and shoot it 1 time for comparison. The whole time I had the T2 base mag-mounted to the roof of my survey vehicle, with no radio attached. I started the base using the LS and just let it log the whole time I was out.
     
  20. Matt Johnson

    Matt Johnson Well-Known Member 5PLS

    This would an issue in the J-Field DPOS session logic for Michael Stazhkov. I suspect it may already be fixed in the PreRelease version of J-Field if you were to try it.
     

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