Yesterdays office

Haven't gotten the chance to do any surveying in California. Thanks for sharing the photo.

It would be nice if Trimble had a better measure up method in that situation. I have been unscrewing the receiver up a hundredth or so then sight over the top of the extension pole. Have to remember to screw the receiver back down.

It was a nice day. Big Bear Lake, CA

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How come my former surveyors I have worked w are working nicer sites than?ÿ me today.?ÿ?ÿ

I had to go look at a failed drainage pipe 10 feet below grade with a bunch of attorneys, soils engineer and an old CE I worked w in 1980.

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Posted by: @dave-karoly

I have been unscrewing the receiver up a hundredth or so then sight over the top of the extension pole. Have to remember to screw the receiver back down.

Why not sight over the tribrach adapter and then add the extension length??ÿ (And maybe cut the 0.01' or so that's introduced by the tape slant at typical HIs.)

@jim-frame The Trimble Lever Arm extension is great for this reason.

@stlsurveyor

we have one of those for the base.

the other two R10 receivers are measure up to bottom of quick release. It has a bumper but they don't offer that as an option as they did on the earlier R type receivers.

I really can't understand surveyors that don't use fixed height tripods.....

Fixed height tripods aren't.

@hi-staker

I presume that you mean fixed height rods supported by a 3 legged "bipod". Here's the reason.?ÿ The rod bubble is a 20 minute bubble. The bubble on a tribrach is an 8 minute bubble. You just can't plumb a rod over a point to the same accuracy that you can a tribrach. So what you gain in vertical you lose in the horizontal.?ÿ

@mark-mayer

We use one of these for every base position: https://secure.fltgeosystems.com/tripods-bipods/seco-fixed_height-gps-antenna-tripod-sec5119-00-fly/

10 minute vial, takes all of 30 seconds to set up and plumb over the point, and there is NEVER any question as to what vertical was used for the setup.

@hi-staker

The base goes on that all day long?

I'm going with the OP set up for my base.

Measure up vs stability, stability wins every time.?ÿ?ÿ

@dave-lindell Aren't fixed height, or aren't tripods??ÿ I haven't found any significant height deviation, but it's true that they're actually quadripods.

@mark-mayer It's easy to swap in an 8- or 10- minute bubble.?ÿ That's what I've done with all my poles.

@mightymoe All day, every day. I've run weeks long projects multiple times and checked OPUS files from throughout those projects and seen less than a few thousandth of deviation. I'll take stability AND measure up, every time.

@hi-staker

I have no beef with others who use those aluminum monstrosities, I just find them extremely annoying.?ÿ I can set up a tribrach/tripod over just about anything without fighting points slipping off and expanding aluminum making the thing pop out of the dimple (if there is one).

I have no problem measuring up accurately, I read both meters and feet on the tape against the measure up mark.

But I understand if you have technicians with various levels of carefulness where the fixed height tripod makes sense.?ÿ I'm not sure if an R10 would work without an extension pole so that would have to be noted.

@dave-lindell

I had one at my previous job.?ÿ It came with the 4700 base.?ÿ We had a 4800 rover (AKA the "hamburger").

I used it for several years.?ÿ One day I was working with my former co-worker Neal; our base on this particular project was a boundary corner monument that wasn't particularly convenient with that gangly aluminum troctupos thing. Neal finally says loudly like only Neal can, DAVE WHY WE DON'T WE USE A TRIPOD LIKE REAL SURVEYORS!!! Neal this thing is fixed height.?ÿ SO!!! WE ARE SURVEYORS WE MEASURE THINGS!!! CAN'T WE BE TRUSTED TO MEASURE A HEIGHT WITH A POCKET TAPE? I had to admit he had a good point and I never used it again after that.?ÿ Besides SECO makes so it's a difficult procedure to get it back into the storage bag.?ÿ The whole thing is just a big pain in the posterior.

But it is required for some types of work.?ÿ Nothing is totally idiot proof, the points must wear down.?ÿ I could never get the bubble to stay in adjustment.?ÿ It designed to be rotated when setting up so the bubble can be out a bit.?ÿ That works with the right type of monument with a fairly deep dimple.

@hi-staker

Heck, I thought it is a bi-pod when I looked at the pic, the third tri-pod leg is almost completely hidden behind the right leg.?ÿ

Posted by: @dave-karoly

Besides SECO makes so it's a difficult procedure to get it back into the storage bag.

The old bags are indeed a pain -- they skimped on material and I darn near scrape the skin off my hand forcing the bottom of the bag around the stud where the point goes.?ÿ I have 3 of those bags that I bought in 2001 and they're all the same.?ÿ The newer bags (I have 3 of those, too) are generously cut and a pleasure to work with.