I have extensive experience using four Promark2's and GNSS Solutions to set control pairs. I understand the software. Like the closed polygons, have verified the results, and have confidence in them.
Based on the stellar reviews on this site, I am thinking of picking up a single X90-OPUS. I was wondering how these units do observing inter-visible control monuments? Without simultaneous observation of both monuments and therefore no measured vector between them, how do they ultimately check on the ground in the real world?
Furthermore I don't understand OPUS Projects and if it would be applicable to the task outlined above.
Thanks,
CB
Independant Observations Must Be Of Longer Duration
To have sufficient precision for control.
Since you have ProMark 2s use them for simultaneous observations, I do it all the time. Get an OPUS-RS position on one point and L1 positions on several others then swap and get OPUS-RS positions on previously observed L1 points. Usually 2 OPUS-RS and double observations or continuous on some points gives tighter control than needed.
ProMark 2s are so low in cost they should never be sold, just keep using them.
Paul in PA
OPUS Projects won't be of use with only 1 dual-frequency receiver, because you won't get the on-site vector solved.
Most communities have some sort of network for RTK work. The static data is usually available for download. We have three base stations locally. I process using these as static units. I get better results than OPUS with shorter occupations.
I suggest keeping the single and dual frequency data in separate files, at least until you figure out how to deal with differing phase centers and such...
Yes but
You can use OPUS projects with a single receiver for multiple observations of one point. I have an antenna on the roof and I have uploaded days of data to an OPUS project.
It is a specific application that would not be typically used.
However, if you have a private Reference Station nearby and one OPUS unit, then you could add the static from the private into the mix and actually have a real use for OPUS Projects (still not the point of the service). Some private Reference Stations provide free Static, while others charge a nominal fee.
