The discussion about GPS vs. TS brings up an interesting observation.
While I was connecting some section lines in C3D, one task is to fix each point to keep it unchanged through the process. In this case the west 1/4 of Section 27 which falls in the land of a neighbor of the survey I'm doing. It's in some scattered timber and although there wasn't any struggle for the R8's to locate it I was happy to be able to get a check-in for it a different day from a different base location, so I grabbed it quickly and didn't really look at the result too much, just saw it was "close" as I collected it and went on my way.
So when connecting section lines I mistakenly picked both points so the section didn't quite close. I zoom in and inverse between them and the distance is .012'. This was from two different base points, a few weeks apart. The accuracy of the newer model RTK's have decreased the errors in my surveys to the point I don't even think about adjustments most of the time, the same can be said of the S6, making the process hands free seems to be the secret with our total station surveys. The check-in "errors" have become so small that they are almost to the point of being nothing.
Don't you hate it when that happens. You swear you have closure, but you don't.
Shore nuff hurts yer feelins. As an old head, i still remember traversing miles, via transit and tape.
N
Adjustment software is for people who make errors. Don't make errors, and you won't need it! (grin)
N
Nate The Surveyor, post: 447187, member: 291 wrote: Adjustment software is for people who make errors. Don't make errors, and you won't need it! (grin)
N
It's getting there, most adjustments I do anymore are vertical, the electronic level does it to all your turns after your end point check-in. But that thing is usually dealing with thousands. There are normally big errors in the vertical numbers using GPS sometimes we see .05'!!!!!;)
A few weeks ago I climbed to a corner on the north face of a nasty ridge. A full 50 percent of the sky was complete mask. The rest was like a multipath demonstration area.
I tied the corner RTK then cooked static while I did my Corner Record work. I did a known point init and fixed quickly. Check one. I then moved away and initialized followed by another RTK tie. My relationship with the nearest corner (1/2 mile east) matched 1983 record 0.4' (check 2). My OPUS-RS and static were within 0.1 of the mean RTK (check 3).
The tools are definitely getting better. I still match the effort of my checks to the time required to visit the Corner. Old habits...
Nate The Surveyor, post: 447187, member: 291 wrote: Adjustment software is for people who make errors. Don't make errors, and you won't need it! (grin)
N
I usually don't compare redundant ties in the field unless I'm staking something -- I just roll it all into an adjustment. I look at the statistics first, them the residuals. RTK residuals can get as large as 0.1', but if a total station distance residual is over a few hundredths I start looking for what went wrong.