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Trimble Curvature and refraction correction

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(@exbert)
Posts: 215
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Topic starter
 

So I'm trying to learn how to adjust traverse networks in TBC. I've been using Starnet for years, but I run all Trimble robotics, GPS, levels and field software, so I want to use the TBC advanced module I paid a sh*t ton of money for. This is a quote from the Trimble Access manual - "If you intend to perform a network adjustment in the Trimble Business Center software using data from a conventional survey, make sure that you enter a pressure, temperature and, curvature and refraction correction."

How bad is this going to Jack up my data? Most of my work is boundary/topo for subdivision design. All sites are small (<300 acres. Most are less than 100 acres).

I'm planning to run a network tomorrow that's about 3,000' East to West and about 2,000' North to South. I'm going to run it with the curvature and refraction correction applied and then I'll redo it without the correction. Can anyone educate me about what I'm about to do or point me in the direction of some literature to educate myself with?

Will TBC spit out some ground calculated coordinates or SPC after I adjust?

Thanks in advance for any information!

 
Posted : May 8, 2016 10:34 pm
(@rj-schneider)
Posts: 2784
Member
 

It's been awhile since I got to operate an S6, but doesn't the instrument, maybe an S8, or later model, sense and record atmospheric conditions ?
With the right software settings, shouldn't the TSC3 handle this ?

You have all the equipment and software, right?

 
Posted : May 9, 2016 3:26 pm
(@exbert)
Posts: 215
Member
Topic starter
 

Yes - the S6 has a barometer on board. I'm curious how the curvature and refraction will affect things. FWIW, our backsight checked 0.003' horizontal and 0.001' vertically at 1,660' v our post processed static GPS coordinates. So I guess it didn't make too much of difference at 1600 feet.

 
Posted : May 9, 2016 4:12 pm
jhframe
(@jim-frame)
Posts: 7308
Member
 

exbert, post: 371334, member: 6143 wrote: I'm curious how the curvature and refraction will affect things.

It shouldn't be any different from Star*Net, which also applies a refraction correction, as long as you use the same value.

 
Posted : May 9, 2016 4:53 pm