First, let me say that this is a good example of a professional surveyor using RTK instead of a technician. It didn't look right and you checked it ou...

He exemplified sweetness. Just a classy guy.His last words sound entirely consistent with what we knew of him for years of internet discussions.

amen.it's incredibly frustrating. the sense of private property rights, which is at the heart of why we are surveyors, is in direct contradiction to t...

Here's a pic of an X90-OPUS receiver on the "POST"A somewhat unattractive shot of the top of our "POST". This is a picture of the x90-OPUS receiver th...

we put the top part of an old prism pole in a pipe we set in the ground in concrete. we drilled holes through it and put wire in the holes. we then fi...

if it'll help, we could just move the center of the Earth over a little. How much do you need?

By the time this thread dies they'll be repaving the highway.

😀 Pretty technical explanation, I know, but we are surveyors after all.

:good: straight from the source!

Welcome to the Thread> ...OPUS could be used to check a bastardized coordinate systemI'm not so sure it's a good idea for you to self study for you...

Welcome to the Thread>...the idea of playing with a new EPOCH of NAD83 and shoving it to an older version, I've seen it before and it never ends we...

> Why does a Horizontal Datum need a Reference Ellipsoid? Can a Datum be both a Horizontal Datum and a Vertical Datum? Is a Geoid just a Vertical D...

Welcome to the Thread> So, if you choose three points across a project, get decent OPUS-derived coordinates on each and the directions and distance...

> Okay, I haven't staked long highway projects. I understand the concepts but not necessarily all the pitfalls.I haven't either. It's just that th...

:good:

> Using a single CF for an entire project (10 miles long) seems risky.> > I would think, short of using an LDP, multiplying each coordinate b...

> To me, the obvious implication is you actually check the control network to discover ...specifically whether there is a significant rotation off ...

Control Witching...> I realize that there are some folks who are worried that there is no way some bastardized control network can be checked by so...

Control Witching...I'm beginning to understand now. OPUS, producing NAD83_2011 coordinates, is a witching stick for control network quality. Wave an O...