Welcome back, Dave.?ÿ Missed 'ya.

I played more with the approximation I posted above, and while it does a fantastic job on the example in Wolf & Ghilani's book, it seems to fall a...

Just in case anyone needs a Canada to US translation, I believe the reference is to Toronto Hydro Electric utility poles.

I think you are right about equal totals taking care of a slight and fixed sighting angle relative to level. But the curvature and refraction correcti...

Duh.?ÿ I should have known that NGS had a handier method.?ÿ I'd never used LVL_DH.

Have you ever worked to such tolerances? It's a specialty field. What confidence level is 0.005? Convert 0.005 at 95% to 0.0025 ft or 0.75 mm std erro...

It often is quite good enough for application purposes to ignore the gravity changes for runs of a few miles/km, but wise to consider how much change ...

That has some merit but a) won't catch the rod setting error mentioned above, and b) means you either have to have a lot of screwdrivers or you can't ...

Posted June 2 2018. Scroll back in the RIP category.

When the 2022 datum is released, transfer won't be an issue.?ÿ You will use the ellipsoidal height from GNSS at your project BM and the 2022 geoid mod...

It would help if they showed the other end of the yellow thing, wouldn't it.?ÿ Unless someone recognizes that, my guess is that it is only a laser bea...

@wendell?ÿ This guy is talking to the wrong audience, and you might want to delete the thread. The advertising information posted is pretty much meani...

Unless the surveyor provided conversion information (e.g., metadata in a note) there is no way to get an absolute location from the drawing.?ÿ It woul...

That's a great use for a fire hydrant, short term.?ÿ But be very cautious about using that elevation for it later.

One bearing and one distance from different points is also sensitive to geometry. Then 90 degrees is bad. But if you have both B/D from one point the ...

It appears to be something that would be used with industrial automation equipment to read data on a variety of interface standards.

You hit the jackpot to have one so close. I know of level lines in the NGS data base where there isn't a reliable bench mark remaining for 15 miles.

I'm not sure worry about the geometry is warranted when you are measuring both angle and distance every time. Geometry is critical when you do a beari...

As someone's signature line says, correct is an identity, not a distance.?ÿ But that doesn't cover the case of missing or obviously disturbed monument...