@oldpacer is it possible the the way you use the term CORS is different than what most consider CORS. I define cors as NGS the agency either owned or...

I know you think these stations are awesome, but I do not. I have had this discussion before with OPUS and EVERYONE thinks OPUS provides very accurate...

Have you ever verified a CORS determined position? I’m at a loss as to how I’d verify a CORS position without using CORS data. for the record, I...

This thread was reactivated after almot nine full years. That shows how amazing SurveyorConnect has been for us. July 30, 2014 to June 25,2023. In...

Yea, them NOAA sites, I dont use them. Checked a couple months ago when I was near one and was only 1.9 feet out. To be clear, are you saying that ...

NGS and CORS Station are two differents things on two different ellipses. There may be other CORS from sources outside the NGS, but there is a sing...

As autonomous positioning relies on the broadcast ephemeris, users interested in its accuracy might want to view this article: Which is why we dont...

Wooah, had no idea. See what a little groundwater will do.

Both start from an autonomous postion. It is the same thing, just a longer observation time. 15 minutes of static is the same as 2 hours of static, ju...

I've been on the rod end of a few plane table stadia surveys, but never on the instrument end -- I was still too far down in the chain of command (i.e...

@oldpacer I wonder about volcanic eruptions. It could be argued that magma stays earthbound, but there's a heckuva lot of water vapor and gases bein...

Ok guys , I am back with some experience to share. I am not good in surveying for many reason , first of all the proper understanding of it. Right...

@lurker I had to stop thinking of all of the varibles, my head was starting to hurt. Compensating magma movement, China population, tidal redistribut...

I am really confused by all of the varying discussions of reference ellipsoids. WGS84 is the reference ellipsoid for nearly every raw satellite’s rece...

Did the earth axis never shift prior to groundwater pumping? One year they say axis shift caused the Ice Age. Another year they say dead dinosaurs and...