The root of the issue is that light travels slower in the glass than in air. So the effective point of reflection is around 30mm (Leica a little more)...

@a-harris Patent is probably not an issue.  Proprietary/trade secret and copyright are more likely to be in play. It's unfortunate the manufact...

What exactly is the input and output type desired?

Since the ditch wasn't filled with waste, you must mean waist. As Senior Spelling Police, you surely agree?

Mentoring.?ÿ Somehow people get licensed without it.

@norman-oklahoma See above:

Perhaps the best argument for using concrete.

I've often asked that question.?ÿ I guess the answer is that people here are arrogant enough to think the world revolves around them. My brother is su...

Strange someone would use form pins.?ÿ Aren't those quite a bit more expensive than rebar?

Or why wouldn't you close the road when the cracks are growing by the day?

If it was done in US survey feet, or chains and links based on survey feet, and the distance is large enough to make difference significant, then you ...

A long and fairly thorough article with no map, sigh.

If you are working with a large area, the state plane coordinate zones may not be appropriate because each is tailored to reduce distortion in that pa...

8.2 meters.

I might add that I just recently did a similar task for a local astronomy club who are putting in a newer telescope and needed to check the alignment ...

The first step is to find out how close it needs to be to "true north" ? (at what confidence level?) If that was metrology, it might need to be tight....