Pause and Resume in Collect

Shawn Billings - Javad

Active Member
JAVAD GNSS
Theoretically, you could do a survey without any streaming corrections (UHF, cellular or otherwise). You could use the CDF position for real time navigation. CDF stands for Code Float and means the autonomous position of the rover is being improved by SBAS (Space-Based Augmentation Systems) like the FAA WAAS (Wide Area Augmentation System) to get real-time, standalone positions to submeter (generally). Once on a point of interest, collect it as normal, provided that the action profile being used is set to log raw data. Once your points have been collected, return to the base, connect by Bluetooth and download the base raw data to the LS/LS+. This does not require stopping and downloading, only connect, and use the "Download" button at the bottom of the Remote Base screen. Use the Post-Process options available in the points screen to process the raw data. As Wes mentioned, it is advisable to collect more than one point on the same point when in a challenging location (under canopy, near buildings, etc.). This will allow you to have redundancy to compare for verification purposes. Use the cluster average, if desired, to create a single point from those multiple points on the same point. This will result in improved statistical precision.

One of the only difficulties with this process is that you will need to return to the base and process the data before you can:
  • make any precise evaluations of the relative position of points (inverse)
  • make any determinations about the accuracy of collected positions of points (verification)
  • stake points (which will require modified procedures)
For staking, you will need to set a minimum of two points near a target point that you can perform distance-distance intersections from. Three is better for redundancy and to improve geometry in some cases.

This process has been available for a while with DPOS and PPK, but required the user to stop the base and required an internet connection. With the procedure outlined above with RTPK, you do not need to stop the base, nor do you need an internet connection.
 

nusouthsc

Active Member
Theoretically, you could do a survey without any streaming corrections (UHF, cellular or otherwise). You could use the CDF position for real time navigation. CDF stands for Code Float and means the autonomous position of the rover is being improved by SBAS (Space-Based Augmentation Systems) like the FAA WAAS (Wide Area Augmentation System) to get real-time, standalone positions to submeter (generally). Once on a point of interest, collect it as normal, provided that the action profile being used is set to log raw data. Once your points have been collected, return to the base, connect by Bluetooth and download the base raw data to the LS/LS+. This does not require stopping and downloading, only connect, and use the "Download" button at the bottom of the Remote Base screen. Use the Post-Process options available in the points screen to process the raw data. As Wes mentioned, it is advisable to collect more than one point on the same point when in a challenging location (under canopy, near buildings, etc.). This will allow you to have redundancy to compare for verification purposes. Use the cluster average, if desired, to create a single point from those multiple points on the same point. This will result in improved statistical precision.

One of the only difficulties with this process is that you will need to return to the base and process the data before you can:
  • make any precise evaluations of the relative position of points (inverse)
  • make any determinations about the accuracy of collected positions of points (verification)
  • stake points (which will require modified procedures)
For staking, you will need to set a minimum of two points near a target point that you can perform distance-distance intersections from. Three is better for redundancy and to improve geometry in some cases.

This process has been available for a while with DPOS and PPK, but required the user to stop the base and required an internet connection. With the procedure outlined above with RTPK, you do not need to stop the base, nor do you need an internet connection.
Shawn,
To your point but in a slightly different situation: We currently have a Delta 3S permanent office base and I would love the ability to perform this function. To accomplish this is it the same process as running an LS as a base? If not can you tell me how this is done?
Thank you!!
 

Adam Plumley

Active Member
JAVAD GNSS
Shawn,
To your point but in a slightly different situation: We currently have a Delta 3S permanent office base and I would love the ability to perform this function. To accomplish this is it the same process as running an LS as a base? If not can you tell me how this is done?
Thank you!!
Yes, you would have to download the raw file from the delta then go thru the same steps used to create a base point in the rover when the LS is a base.
 

nusouthsc

Active Member
Yes, you would have to download the raw file from the delta then go thru the same steps used to create a base point in the rover when the LS is a base.
Awesome! I just tested it at the office here and got 3 points to agree within 0.03' on 10 min sessions. So that is sweeeet! One more question; I currently have the base logging at 1 Second intervals. If I remember correctly someone said we would be safe collecting 30 second intervals. Does that apply to this situation?
 

Adam Plumley

Active Member
JAVAD GNSS
Awesome! I just tested it at the office here and got 3 points to agree within 0.03' on 10 min sessions. So that is sweeeet! One more question; I currently have the base logging at 1 Second intervals. If I remember correctly someone said we would be safe collecting 30 second intervals. Does that apply to this situation?
I think so but I haven't tried it yet. RTPK base upsampling is an option under RTPK usage.
 

ZTkowasz

New Member
Notice 8005 in red. This was just a very short 4 second shot.
View attachment 12886

Look at the vertical difference of 0.28'
View attachment 12883

Notice we have the option to post process just that one point or all rover files. So cool.
View attachment 12884

Check out how both the horizontal & vertical got better after I post processed. I never used this as a tool until Shawn mentioned it earlier. It seems like a no brainer to do on all my points. I don't know why processing the same 4 seconds of data produces a different answer though. This does not fit the thought process that rtpk using all 6 minutes might produce a different result than on just one of the 2 minute intervals if this was one of my canopy shots. Thoughts anyone?

View attachment 12885
I noticed that there is a "Points screen Post-Process Interval" setting in the RTPK Usage page. Is it possible that if this setting is different from your data-split interval it will cause the difference in the post processed results you are seeing?
 

Shawn Billings - Javad

Active Member
JAVAD GNSS
I noticed that there is a "Points screen Post-Process Interval" setting in the RTPK Usage page. Is it possible that if this setting is different from your data-split interval it will cause the difference in the post processed results you are seeing?

Good catch. Yes it will make a difference. I was unaware (or likely forgot) that feature was there. I'm currently set to "Default". I don't know what that means. I suspect "default" processes all of the data as one, but that is just an assumption.
 
Top