I'm a student studying surveying and analysis. I have gathered coordinates data on the same point via VRS, RTK, and Thingstream's PPP.
It seems like VRS and RTK goes similar, but PPP keeps getting coordinates that are transitioned by similar distances.(~0.8m)
I have heard that when RTK surveying, one must know the coordinates of the stations. And I know for a fact that RTK(We use our school's stations) and VRS were using coordinates from 2000, and PPP is using coordinates from 3 months ago.
What could be the leading factor of this error?
During this period, My country's Datum(South Korea, ITRF2000 -> KGD2002) has changed. Alongside the drifting of the continents(~1.7cm/year). Can this change in the datum be the leading cause?