Dear Bill93, I'm the former Chief Geodesist, before Dr. Dru Smith & Dr. Dan Roman,and I think I can help answer your questions. Yes, indeed, you a...
John Putnam, post: 425425, member: 1188 wrote: If GEOID12B returns VIVD09 values in VI and NAVD88 values in FL, how do they make the change. Is it at...
>> "...how much difference can there be on a 10 mile long island?"A good question. To explore this I extracted GEOID12B intoa sub-grid enclosin...
Dear Larry Best,Perhaps I can help. I'm Dennis Milbert, Ph.D. I retired as the NGSChief Geodesist in 2004. My predecessor was Bill Strange, and mys...
Dear rfc, >>>Does quasi-decadal periodicity affect GPS observations?>>>Doesn't this impact the very ECEF reference system that GNSS ...
This might be more than you want, but a monograph on tensors andgeodesy is Hotine's Mathematical Geodesy. For geodynamics, I suspect you will find ma...
RalphDear Dave,First, let me say "thanks Ralph" for posting and highlightingthose notes. Also, for those interested, the Rapp/OSU Geometric Geodesy In...
GeeOddMike is correct that GRS80 is not merely an ellipsoidbut is a rotating, equipotential surface that is an ellipsoid.As such, it generates not onl...
Wink! 😉 All the best!
Dear eddym and Dave,Hi, eddym! Welcome!eddym's post represents the first definition of "datum" in thegeodetic glossary. That is, the datum is only a...
Ben,Thanks for the input. 🙂 Dave,Yes, there is the NGS Geodetic Glossary. It was a compilation of definitions found in general use -- and it prece...
Dave,Horizontal Datums and Reference FramesDave,OK, in the hierarchy:A Datum is a Reference Frame.A Reference Frame is a Datum.They both have coordina...
Dave,I know I threw a lot of material up on that post.So let me address your last comment regarding Reference Frame and crustal motion.By the IERS Con...
Dear Dave,Dave asked:"What's the difference between a horizontal datum and a reference frame?"Let's look at this in two steps. First, the relation of...
I can help.I have not read the article in question, but I have studiedthe topic."Polar Tide" is more commonly known as "Pole Tide", so Googlehits on t...
