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shawn-billings
shawn-billings
@shawn-billings
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Joined: May 29, 2012 9:14 am
Last seen: March 14, 2025 3:27 pm
Topics: 93 / Replies: 2598
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RE: Grid vs. Ground in data collector

As you have explained it, this does not reflect well on your boss.

11 years ago
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RE: Rover static occupation time

It occurs to me that you weren't processing ProMark3 to ProMark3 in this test, but ProMark3 to X90-OPUS. Nothing wrong with that, I'm just not sure if...

11 years ago
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RE: Rover static occupation time

Hard to argue with real world results. Back in the day, we tested the ProMark2 similarly, and I found that at a 1000' I could get reliable fixed resul...

11 years ago
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RE: Cut throat tactics

Sounds like the previous surveyor knows he isn't working for them anymore. Hopefully your client has cleared the books with him. We do things the same...

11 years ago
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RE: 8 Mile RTK vector Accuracy

I applaud you for this:I recorded 1 second epochs for 8+ hours to base that was approximately 10 kilometers (6 1/4 miles) away. I can't disagree with ...

11 years ago
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RE: 8 Mile RTK vector Accuracy

I'm not really interested in proving the precision of RTK at this point. I've convinced myself of this already. What I'm after now is determining what...

11 years ago
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RE: Traverse between Static GPS pairs

But the misclosure would be East/West, his is North/South at the end of East/West lines. That's a directional problem, not a linear one.

11 years ago
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RE: Traverse between Static GPS pairs

> Agreed that conformal projections preserve angles over short distances. Poster is near Atlanta, which is Georgia West zone. Convergence at Atlant...

11 years ago
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RE: Traverse between Static GPS pairs

convergence has nothing to do with it.State Plane is a conformal projection. Over short distances angles are preserved. One to two miles would fall in...

11 years ago
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RE: Traverse between Static GPS pairs

Shadow induced parallax can have low residuals in the set if the operator sights wrong consistently. Since you're using auto track, it's irrelevant.

11 years ago
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RE: Traverse between Static GPS pairs

Auto track will be impervious to parallax due to shadows. You can probably scratch that theory.

11 years ago
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RE: Traverse between Static GPS pairs

Manually sighting or letting the robot Auto Track?If manually, what is the instrument man sighting on?

11 years ago
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RE: Traverse between Static GPS pairs

I've encountered a couple of things over the years that can cause this:1. Particularly since you mention East/West traverses, sharp shadows caused by ...

11 years ago
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RE: 8 Mile RTK vector Accuracy

Yes. You are correct. I misspoke regarding NEU, semi-major and semi-minor are what I had in mind. Thank you. I agree regarding vectors. At some point ...

11 years ago
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