Set up my biggest tripod (Wilt) but could have used another 5 feet. HI was 11.09 feet. Hope OPUS will give me decent results, I have 4-1/2 hours data. I was only allowed to whack one Juniper right next to the monument. Without doing that it was lights out.
Wilt's little brother was working a fence a couple chains away.
Now THAT's a TRIPOD!
I hope that the wind wasn't blowing too hard...
🙂
Loyal
Jeez, A 4' Threaded Extension Is Cheap...
Why don't you have any?
Paul in PA
I can just hear it now... I-man quit, cause he was skared of heights!
Where'd you get that thing? Back in the day, we would have bought one of those, to run traverse!
🙂
N
I looks like the fence PI's about 30' away from the monument. What's up with that?
Jeez, A 4' Threaded Extension Is Cheap...
Actually I have several 2 foot threaded extensions but didn't have them along. Also I don't trust them to stay vertical especially with a large GPS antenna.
I have some ideas on how to get to about 30 feet but never enough time. I was going to use a Wild ZNL level to center over the point. I put off buying the level and when I went back they had discontinued making them. I look here and there for one but never found the right deal so far.
No wind to speak of today.
My I-man is my left eye. Hasn't quit but probably will die from an accident some day. I think you can still buy these from Dutch Hill. I had to drop it down a bit because I didn't dare stand on the top step of the ladder.
As I understand it from a previous thread, there is another monument at the fence intersection (or close to it). The trouble is the fence is built to the wrong monument.
A bunch of the fences in this area are offset about a rod. Makes me wonder if they didn't have two rod access lanes (roads) in mind but only one fence ever was built.
Actually the fence under the short tripod should go into the marker under Wilt. A mistake due to miss understanding of the GLO surveys. I think they found the marker out in the open and didn't know there were double markers between Sections 1 & 12. The PLSS looks simple from the outside but is very complex under the hood. I seriously doubt any surveyor was involved. The landowners just found the monuments and built their fences. The fence goes right into the marker at the north quarter corner.
For the quarter section I'm working I've found all the markers from the 1913 survey except the west quarter corner. There is a new recent marker at that point that was prorated. I'm going to snoop around with the metal detector but nothing is sticking out of the ground. Probably OK the 1913 west quarter corner was also prorated. I just found the northwest corner today but had to rehabilitate it and haven't collected the position data. I found a pushed over pipe within about 2 feet of where the 1913 survey said it would be. The base of the pipe seemed good and I found a soft spot down to the base and then it was firm. So I'm good to go except for the messed up quarter section line fence.
The photo begs the question: Why not set up the receiver in the open and tie the monument with a total station, instead of worrying about sky view obstructions?
Yeah, I know. Since I stopped doing construction layout I don't have a total station. I probably should buy an old one just for the few times a year when I need to do this. I would need a light one (how much equipment does one old guy want to pack in for those really bad places you can't drive within a half mile or more? And up big hills also!
I have a corner sitting under cottonwood tress I need to do. Waiting for a friend to come buy and tie it in for me. A hundred foot tape and two offsets will work also just a little less accurate. Also two OPUS sessions instead of one (could go less accurate and use RTK).
"(could go less accurate and use RTK).'
Just saying.... If your optical plummet is out in the slightest at that height, RTK is just as accurate if not more. lol
Randy
> "(could go less accurate and use RTK).'
>
> Just saying.... If your optical plummet is out in the slightest at that height, RTK is just as accurate if not more. lol
>
> Randy
That's a good point - I'd say the best way to ensure precision in this case might be to hang a Bob.
Funny how the old ways are sometimes still relevant...
A Single 4' Threaded Extension Is Stable...
Better than 2 2' pieces. When I have used tripods I only use a single extension be it 2' or 4'. I have also added a second 1 meter section to a 2 meter fixed height rod. The fixed height rods have a wider diameter and are thus more rigid at the connections. Because of the inconvenience of measuring down from an extenstion I measure down with the antenna mounted low then add the 4' section. Means I have to convert a slant measurement to vertical then add 4'. Worth it when you need the clear sky.
Paul in PA
Time for a Bilby tower! I think I agree with Jim's observation about it probably being more practical to set up in open area and use total station to locate the desired point, but wondered nonetheless whether some sort of miniature Bilby tower might have application. Lightweight carbon fiber frame, height of 20-30 feet, sets up quick with one man, breaks down to a pack....Just thinkin'...
To me, that looks like decently open sky. I would have put that up on a 2m pole, collected my 4 hours and walked away. I have gotten shots in much harder tree cover then that (with proper checks). I think it makes a difference when I am processing my own data, and using 2 local base stations to process against as well as running multipal other receivers at the same time for lots of vectors. I know Juniper - Pine - Cedar really eat up the GPS signal, but you should not have had any problem with a normal setup on that corner, especailly just for a property corner shot.
I'd had several ideas about a tower or other ways to go tall. Centering over the point is the biggest problem. I think a ZNL plummet would work best. I had got a price from a dealer but put off the purchase. 6 months later I went back to to order it and was told they were discontinued. ZNL's are very hard to find. If anyone has one collecting dust in the closet let me know.
Using a plum line seems like a possibility but in the wind off a somewhat flimsy structure at 20-30 feet, I don't know my, instinct says it would be problematic. Long plum lines in buildings don't always work that well.
Uh, why not just set a pair of points and tie it in conventionally? Beats the hell out of 4 1/2 hours of "maybe" data and an 11' mark up.
Look at my avatar - the tripod seems too tall
