Geoff
I was simply commenting on your quoted statement in general.
As far as “calibrations” go...I DON'T know. In nearly 20 years of using GPS (Static and RTK) I have NEVER used a “calibration” of any sort. Although I CAN envision a scenario where a “calibration” might be the hot ticket, there are better ways to solve even those situations (at least in my opinion).
Loyal
OR....
Oh, I'm not saying it can't get totally messed up. But I do know that "eddycreek" is not some hack surveyor that isn't going to think this through.
Also, curious how you've seen this mess up before. Are you saying you've re-done calibrations as a test, using the same configuration of control and come up with radically different results for stakeout? That would be an interesting situation, for sure.
OR....
I think Geoff is saying that when you re-calibrate, there would probably be differences in the hundreths range. Probably nothing radical, just minor differences in vertical mainly. When using scs900 to calibrate you set up a base, either on an existing control point, or use an "unknown" point that the software generates a position for after the calibration is complete and saved. You have the option of how long to collect data on each control point, but it is still a relatively short rtk shot nonetheless and not repeated locations periodically at different times of the day and averaging the position for you. You basically start a calibration and finish in the same setup time, typically a couple hours or less for a site like the one eddycreek is showing us. You really aren't getting pinhead accuracies, but what I have seen more like inside of a golf ball. Good enough for machine control, but not what some of you guys can do with multiple observations, different days, etc.. SCS900 is Trimble's "construction" software and is geared more towards contractors using it for grading and is a pretty simple software in regards to setup and getting a site started.
