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Center of Utility Pole

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BurnorMJ
(@burnormj)
10+ posts Member

Hello All,

I'm currently using a TSC3 control with either an s-series robot of r10 gps, and I have been asked this question from the engineers that I work with constantly, "can you shoot the center of a utility pole." The question has come up because when they look at the points in Carlson the node is not the center. I usually shoot the f/o the pole assume they can offset the symbol in the drawing. Is there anyway with trimble access to shot the center of offset the shot the distance to the center of the pole? Same goes for tree's? 

 

thank you

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Topic starter Posted : June 13, 2019 4:57 am
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VA LS 2867
(@va-ls-2867)
200+ posts Member

If you don't have a routine for recording a separate distance and angle or on offset shot, record a location on both sides of the pole and place the symbol between them.

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Posted : June 13, 2019 5:14 am
Dave Karoly
(@dave-karoly)
10,000+ posts Member

Yes, distance offset. There is also horizontal angle offset but if I'm by myself distance offset works best.

You have to change to standard edm mode then the drop down which defaults to angle & distance has a lot more choices. After you choose distant offset you can go back to tracking mode.

right or left is facing the total station. You can go in or out too.

I haven't used offsets in RTK so can't help you there.

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Posted : June 13, 2019 5:27 am

Lee D
(@lee-d)
1,000+ posts Member

To use offsets with RTK you go into COGO and go to Create Point. You can do Bearing / Distance, Distance / Distance, or Bearing / Bearing. They have a nifty routine where you can use the sun as your bearing reference, but personally I find Distance / Distance to be the easiest and most accurate.

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Posted : June 13, 2019 5:47 am
FL/GA
(@flga-2-2)
5,000+ posts Supporter

Just shoot the face measure the diameter eyeballing with a tape and add half of that to the distance your shot. Been doing it that way for years without any problem. 😎 

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Posted : June 13, 2019 5:49 am
Lee D
(@lee-d)
1,000+ posts Member

If I know the diameter of the pole I shoot it reflectorless and do a distance offset by the radius. The only issue is that you have to remember to put it back to Angles and Distance when you're done!! (From experience... lol)

Hz Angle Offset works fine also you just shoot distance to the side then angles to the center. I like that for trees because I don't need to worry about what the diameter of each tree is.

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Posted : June 13, 2019 5:52 am

chris mills
(@chris-mills)
500+ posts Member

Interesting that there are two different approaches to what needs to be recorded - is this a cultural thing? I've always been asked to record the diameter of the tree/pole which enables the symbol to be scaled to size, so my normal approach is the same as FL/GA. If it is being done remotely I shoot the centre line and then record angles to either side so as to be able to calculate the width. Better than just a standard sized symbol.

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Posted : June 13, 2019 6:10 am
TickMagnet
(@tickmagnet)
100+ posts Member

menu 1 2 1

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Posted : June 13, 2019 6:42 am
christ lambrecht
(@christ-lambrecht)
1,000+ posts Member

We keep ours always in Distance Offset mode but set values to zero for non offsets. However in Distance Offset Mode the S6 won't change to Face 2 automaticaly if you need that. (We don't)

 

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Posted : June 13, 2019 7:11 am

not my real name
(@not-my-real-name)
500+ posts Member

Three or more points and a regression to make a circle. Use reflector-less mode or prism with zero offset. I assume all survey equipment, regardless of the brand can do this. I do at least three observations with the laser for coordinates of all trees or poles that require a fussy location. Then again, is the pole plumb? Do you have any requirements for the height at which the data is required? 

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Posted : June 13, 2019 7:13 am
chris mills
(@chris-mills)
500+ posts Member

The risk of this method is that the 3 points are going to be close together so there is a real chance of ending up with a significant error in the diameter, far greater than the actual measured error.

Any distances taken close to being grazing rays (which is what you need for getting a good centre direction) may be very poor, depending upon the pole surface. Method works well on larger diameter objects, say over 4' diameter, where yuo can keep away from the visible edge and get a decent footprint to the spot.

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Posted : June 13, 2019 7:30 am
Rover83
(@rover83)
1,000+ posts Member

I think it is partly cultural, but also project-dependent. For a the more intense transportation design surveys, we make sure to tie the center of the pole and note a typical size, or scale our symbols accordingly, since design can hinge on the exact location and size of some of the improvements in the right-of-way.

However, I am doing some drainage improvement/culvert replacement projects for a county, and they don't particularly care about the size or the exact center of the poles unless they are transmission line pylons or similar. Tagging the face of the pole is enough, it lets them know there is a pole within a foot or two of the symbol, which is plenty of tolerance for the designers.

Also, to the OP, Access has a "Circular Object" Measure Method - shoot the center face of the pole, then align crosshairs with tangent/edge of pole as you are looking at it. Or observe both tangents.

It creates the point at the center, then computes and notes the diameter in the point code attributes, which then can be exported as part of the code. Can then be used to scale symbols in cad software. No taping or hand entering radii necessary...

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Posted : June 13, 2019 7:42 am

not my real name
(@not-my-real-name)
500+ posts Member

Not in my experience. It may be good to get more than three observations in case of a poor reflection.

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Posted : June 13, 2019 8:15 am
Lee D
(@lee-d)
1,000+ posts Member

I never thought about using Circular Object for trees and poles... it works great for storage tanks.

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Posted : June 13, 2019 8:50 am
BurnorMJ
(@burnormj)
10+ posts Member

Thank you for the information I look forward to using these techniques.

 

 

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Topic starter Posted : June 13, 2019 9:58 am

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