Dane Mince, post: 395451, member: 296 wrote: If one is using GPS (based upon leveled NGS BMs) It's going to depend on the length of the observations ...

Kent McMillan, post: 395446, member: 3 wrote: the benchmark is "fair market value", i.e. what a piece of real estate could actually be sold for in an ...

I still need to be convinced that west is faster than east. You have the same angular velocity as the earth at the equator plus or minus your powered...

If you use cos(97d00'15") you can always add and the cosine takes care of the +/-sign for you.Edit: Tom beat me to it. I need to quit fetching multip...

Here's a spreadsheet I did once upon a time for 3-wire work. Easy to edit to single-reading work.Sideshots are difficult to accommodate while keeping...

I thought your story was going to be like the one a friend told about his brother in law. The BIL was an inspector for all the grain elevators in the...

Made me look:

Rooftops?Get at least three GPS sessions in the most open areas available in the vicinity and traverse to the points in question?

Lots of good info and advice in that letter, but nontechnical people's eyes will glaze over before they get the gist of it or get through the length o...

Rich., post: 394483, member: 10450 wrote: .025' = .02' or .03'. The purpose of rounding to the even number, instead of always up or always down, it t...

Many years ago (before everyone had a data collector) I watched a local surveyor reading distances to 0.005 ft from his instrument and recording them ...

A few weeks ago we were at a small bluegrass festival in a wooded park, with RV's and tents everywhere. People showed us a large tree, perhaps 30 ft ...

Loyal, post: 393487, member: 228 wrote: orthometric corrections ... on something 7 miles x 3.5 miles in California, this MAY be significant (especiall...

Scotland, post: 393375, member: 559 wrote: My first guess would be NAD27 (the old EC) and yours being NAD83. I don't think the horizontal datum could...

Jack Chiles, post: 393172, member: 24 wrote: All distances shown hereon are ‰ÛÏsurface‰Û distances and may be converted to grid by applying a combine...

Rebooting resets the software, but unless you unplug or power down and wait for all the charge to bleed off, hardware that has gotten in the wrong sta...

Two things determine the magnetic signal of an isolated vertical iron. One is the soft-iron effect whereby it sucks in the earth's magnetic field, an...