Where Have You Been with Your LS Lately?

[Wes Cole]

Interesting situation you got there. If he called in a locate and they didn't mark it, he may have a leg to stand on. I'd also say if the previous house was built over the line, and depending on how long it's been demolished, they'd have a hard time claiming a prescriptive easement of any particular width...but maybe it was a written easement?

 

[Adam]

The poor guy, he didn't know. Didn't speak English very well and not aware of the customs of this land. No locate was called in. I called one in and also trying to meet with the city. I have done a lot of sewer work in my past and it's not out of the ordinary for a manhole to be hidden and not mapped on the GIS, especially for really old lines. Without excavating it's a toss up where the line really is. Manhole to manhole it goes right under the slab. I still got some research to do. The guy called and I did not understand him well, I thought he was inquiring about setback lines. He tells me his story then. It is a shame that someone would issue a building permit knowing they have a line there, I mean it's on their GIS maps right? He tore down the house recently, it was really old. So is the sewer.

 

[Adam]

I'll guess Adam.....full three phase RTK in 6-10 minutes under there?
Or maybe you did a 12-15 minute PPK and it checked within 0.05' (or better) with the RTK?

Here is the comparison of the PPK and RTK of the final shot point ap548. The observation times shown in the screenshots aren't quite long enough to catch a bad fix in the canopy, I was staking out so I had already done enough to know I was working on the correct fix. I had been observing the readings for 10 minutes or so without saving any points (the metal wasn't in the ground yet).

 

[Darren Clemons]

Here is the comparison of the PPK and RTK of the final shot point ap548. The observation times shown in the screenshots aren't quite long enough to catch a bad fix in the canopy, I was staking out so I had already done enough to know I was working on the correct fix. I had been observing the readings for 10 minutes or so without saving any points (the metal wasn't in the ground yet).

View attachment 6073 View attachment 6074

Good stuff Adam. No other GPS out there gives the user this kind or redundancy and accuracy! There used to be a time where collecting data under heavy canopy wasn't even attempted and if it was it most times left quite a bit of uncertainty where multiple trips back to re check the point we're required. No more!

 

[Adam]

We talk quite a bit about how the LS works in canopy. It is pretty dang good in the wide open too. Today I did a topo for some design around existing soccer fields at a park. I pulled in to the park about 8:30 am, set two control points and shot 826 topo shots, measured inverts, took pictures, all the good stuff. I was pulling out by 2:30 and never set up the gun (I thought I would shoot some stuff reflectorless but didn't have to). Here's a dropbox link to the KML file. https://www.dropbox.com/s/sub8nvspklhepi6/BAILEY RD PARK-170220.kml?dl=0

 

[Adam]

Mitchell County, NC

 

[John Evers]

On your behalf, I am glad your job did not involve climbing those little bumps in the background. I am getting a little old for that.

Nice scenery.

 

[Adam]

On your behalf, I am glad your job did not involve climbing those little bumps in the background. I am getting a little old for that.

Nice scenery.

I will be heading to the ridge next week!

 

[David M. Simolo]

John, I know if there was a deer up there that you wanted you'd climb it in a flash.

 

[Shawn Billings]

I did a demonstration last Friday and wanted to show how the verification process works. It's almost impossible to explain in the open because it all happens so quickly, so I took it to some difficult canopy. He's from Alabama and wanted to see the performance under pine canopy so we headed for the heaviest pine I had at hand. We collected data on two pine stumps. The first we shot twice. The second only once. All of the observations were sent to DPOS for base-rover processing. It's probably not good sales etiquette to visible show surprise when your product works, but I can't help it as I am continually impressed by the LS. Here are some pics I took with the LS.

First stump (canopy was not quite as bad as the second stump)


Second stump


Overhead view from Second stump


Forward view (to Northwest) from Second stump


The first stump was point L005 and L007
The second stump was point L006

I've attached the pdf of the project as well. The inverse from L005>L007 is dN -0.022', dE -0.092', dU -0.144'
The difference in RTK and PPK was:
L005 dN +0.008', dE +0.006', dU -0.009'
L007 dN -0.018', dE -0.041', dU -0.254'
L006 dN +0.020', dE -0.000', dU +0.017'

 

[Matt Johnson]

I did a demonstration last Friday and wanted to show how the verification process works. It's almost impossible to explain in the open because it all happens so quickly

A simple way to demonstrate it is to set it 1 Hz and collect a point in the open. Physically move LS to a different position to simulate a bad fix.

 

[Shawn Billings]

Here is an aerial view of the area:

 

[Shawn Billings]

A simple way to demonstrate it is to set it 1 Hz and collect a point in the open. Physically move LS to a different position to simulate a bad fix.

I get what you are saying, but most of my potential customers would not understand why I was moving the LS around.

 

[Nate The Surveyor]

A good way to do this, is on, a corner set.
You've got enough data, to drive the rebar, so you set aside the ls, and bipod, while driving the monument. This simulates a bad fix.
Through this means, you get familiar with the LS's behavior, on a bad fix.

 

[Adam]

Mitchell County Mountain Laurel.

 

[Shawn Billings]

Today I had to find and collect an iron rod at the base of an iron fence. On the other side of the iron fence were two German Shepherds. They were calm as long as I didn't get too close to the fence, but since the rod was right at the base of the fence, I had to adapt, improvise and overcome. I found a sheet of OSB and leaned it against the fence. The dogs seemed disappointed that they didn't get any surveyor tartare.

 

[Adam]

Well its not everyday you find a sheet of OSB laying around waiting just for you.
MacGyver would be proud!

 

[John Evers]

The neighbors cat tossed over the fence would have worked equally well. ( I actually love cats)

Those two guys really just look curious to me though. Tail posture reading only. I bet a nice tone of voice, and half of your sandwich and they would have been your friends.

 

[Shawn Billings]

They were very sweet and docile until I got close to the fence then they started reaching over and through the fence to nip at me.

 

[Adam]

I had a run in with a German Shepherd one time that has made me particularly cautious of that breed. The dog was my neighbors and I wouldn't get out of the truck when the dog was out. He had already made it clear he didn't like me. One day I thought the dog was put up and walked over to the neighbors to chat. Of course he wasn't up and met me coming up the drive. He came up to me and stood on his back legs and lunged at my throat. I put my arm in front of my throat and he grabbed a hold of my hand but did not put much pressure. Just enough to let me know he had my lunch if he ever wanted it.