Hello,
A question for the pros:
Would the vertical component of GNSS data gathered by RTK continuous topo from a moving vehicle be noticeably more accurate if those observations are also post-processed by combining data from a nearby secondary GNSS receiver in static mode (not broadcasting RTK corrections) at the time of survey?
RTK GPS Base - 3000 metres away
Additional static receiver for PPK - Within 1000 metres.
The RTK base station being permanent difficultly accessible, it is more convenient to simply set-up a different receiver nearby the site for the PPK static data.
Thanks,
Georges
I would do both, but use the numbers from the base that is sending out the RTK. I've actually done what you are talking about and if the control is in sync there should be little difference in the final numbers. 3000 meters is so close that I can't see mixing up the processing. However, it should be a good check on your numbers, so do both and get a check on your topo.
I always check the numbers on a topo with multiple locations. If you run a 1000 points for a topo session on a 4-wheeler go back out with a rod using a different OH and check a random sample of topo shots. It is well worth the time.
The most important thing with PPK is giving the sessions time-as much as possible. For a topo it's not occupation time on the point-it's how long the receiver is in fixed mode during the topo. Start it and let it get fixed while you do something else getting ready for the topo. With such short baselines there should be little problem with a PPK topo.