Which is it?
Sorry, the correct title is: "GPS for Boundary Surveys"::-/
Take measurement with a steel tape. If the surveyors don't know what they're doing, you get slope distances reported and distances uncorrected for temperature. You might even get distances measured just by eyeballing the tape graduation over the ground mark, no plumb bob need apply.
[sarcasm]Steel tape? Hell, that's too much trouble. This plastic tape on a hand reel does just as good.[/sarcasm]
One Hand Clapping (a 90)
> I'll take surveying koans for $1000, Alex.
"What is the sound of one hand clapping a ninety?" is correct.
One Hand Clapping (a 90)
[sarcasm]Built the whole thing with Wing-Dings and Rag Tapes![/sarcasm]
One Hand Clapping (a 90)
🙂
and maybe
What is "Where's line?
Which is it, a few hundredths or a few feet?
Most always I will have set a check-in point or two somewhere in the vicinity, so that when I'm back in the area to do another survey I will hit those points during the course of the work. The average of those redundant shots should provide an indication of how close your "mid-point" would be.
Without having checks on those common points I would not attempt what you are suggesting.
Which is it, a few hundredths or a few feet?
"You do not revisit the four monuments from 2009-2012."
Then I would consider myself to have been negligent.
One Hand Clapping (a 90)
> What is "Where's line?
Judges? No, I'm sorry, the correct answer is "When is a line?".
Which is it, a few hundredths or a few feet?
:good: :good:
One Hand Clapping (a 90)
I used to hear of it as an "Arkansas" 90. I have no idea why.
I wouldn't set anything without checking into the controlling monuments.
But I will say that if geographic coordinates are done properly you should be close (couple of tenths or better).
Examples:
I needed a corner which turned out to be the reported lat and long point for a BLM retracement done a few years prior. It had a lat and long on the BLM plat. I was running off a base point coordinated by OPUS. So I punch in the BLM Lat and Long and RTK the marker with my base about 3 miles away. If I remember right the readout was about 0.15 feet to the corner. I thought it was pretty good.
Last fall I was at a township corner I coordinated with OPUS 3 years ago. I'm running the RTK from a base point just recently coordinated with OPUS about 4 miles away. I set the pole on the cap and got 0.03 feet horizontal and under a tenth vertical. Not too bad.
Visited a corner coordinated by another surveyor with GPS and a state corner record filed. Base running on a CBN point about 2 miles away. I was just there to flag the corner but as I recall the readout was under a tenth (horizontal). Works for me.
I was flagging some BLM markers with lat's and long's from a recent BLM retracement (pulled from the GCDB). Same deal, I'm running an RTK base off a recent OPUS solution. I wasn't doing precision work but basically the BLM coords set me down on the caps. This one was tricky because the GCDB coords where reported in NAD 27 and I had to change them to NAD83 which I was able to do in TBC (probably embedded NADCON). I actually was surprised it worked as well as it did. Sometimes you get lucky! I would have found them anyway even if they'd been fifty feet off (aluminum caps in mounds of stone about a foot above natural ground). A good quality hand held would of been fine for search, I just don't have one.
Like I said, I wouldn't set anything without checking into the controlling points. But if all the coordinate work is carefully done by competent operators you should be close.
Which is it, a few hundredths or a few feet?
by Jim in AZ, Friday, January 18, 2013, 16:14 (8 days ago) @ Holy Cow
"You do not revisit the four monuments from 2009-2012."
Then I would consider myself to have been negligent.
Heck, NGS adjusts more often than that .............
