Episode 2 of my "plan to scan" mini-series is out! This week I cover why I chose to use the equipment I did, & more importantly, how to make sure that equipment is calibrated properly.
Just a heads up this video is geared towards newer surveyors so it may be a touch on the introductory side for a lot of the seasoned members here.
Awesome information and presentation !
With the JEOC tribrachs you are using I'm assuming you are still using the genuine Leica GMP101? Always wonder whether the non genuine prisms are anything like as good but never been game to risk it.
I'm also a fan of rotating plummet. Use a Sokkia AP41 to mount GNSS base on and occasionally as robot backsight.
@lukenz that is correct.
You and me both. I have a knock off prism accuracy test on the way so we should both have a better idea fairly soon.
I suspect they will fair ok in terms of accuracy until the durability test but time will tell.
Cool will look forward to that one. Enjoyed the ATR one too.
In terms of ideas be cool if you can beg/borrow brx7, gs18, Topcon/Sokkias latest and maybe one of the CHC receivers and put them though the canopy test also. Feel like for existing survey tech GNSS under canopy is still one of the 'frontier' areas and for small shops all you really get is the sales person's bluster.
Thinking about the results of your control survey for this project being at mm level I'm wondering how you measured height of instrument with that kind of precision? Find taping up to dimple on side of instrument (software then corrects the slant height) would add a couple of mm of uncertainty on its own eyeballing the measurement and if box tape tip has any wear/damage that's another mm or so. If chasing any precision with robot heights only way I've seen is resection where instrument not over any of the marks.
That's a great idea. As the channel gets more views, opportunities to work with larger manufactures are opening up so hopefully that will be a possibility in the not so distance future. I just cant afford rentals because the channel doesn't, and will never be, a source of income.
Great question, there's several little techniques you can do to increase vertical precision, I think I went over some in this video but I cant remember everything I covered to be honest.
Im working on a STARNET instructional video currently when I did a closed traverse over 8 legs. Closed out to... 1-2mm vertically if memory serves correct. Then I ran a level loop through it, the largest deviation I saw between the traverse elevations and the level loop was 0.004' or one and one third mm. Average was 0.0011' or 1/3 mm. Im making all raw data public for that one in case anyone wants to question the validity, shoot me a message on LinkedIn as well if you're interested & i can send over the JXL and the adjusted starnet project if you're interested, level notes, ect.
It's absolutely possible to get high levels of vertical accuracy with a TS with specific methodology. Horizontal can be toughed when we're talking about those kinds of numbers. And most importantly, with a LSA.