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Leica GS18i Rover with Camera

Gene Kooper
(@gene-kooper)
1,000+ posts Member

I have a project where I will be using a Leica GS18i to map buildings and features in a small town.

Anyone here using this equipment? If so, I would appreciate any input.

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Topic starter Posted : May 17, 2022 7:49 am
Brad Ott liked
Norman Oklahoma
(@norman-oklahoma)
5,000+ posts Member

I picked up a GS18i early this year. So far I have only trialed the imaging, I haven't used it for production. It does seem to work as advertised, but is a rather time consuming way to acquire point data.

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Posted : May 17, 2022 8:35 am
johnymal
(@johnymal)
200+ posts Member

Use a laser scanner camera is time consuming !

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Posted : May 17, 2022 5:45 pm

Gene Kooper
(@gene-kooper)
1,000+ posts Member

The job is to map 24 lots in an old mining town west of Denver. The mapping accuracy is 1 foot and the map will be used for a cultural and historical preservation study. Depending on the results of the initial mapping, the job may be expanded to include some of the downtown businesses.

I have another job that may benefit from the GS18i, that being to locate the corners of several old buildings that were part of a triangulation survey.

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Topic starter Posted : May 17, 2022 6:00 pm
Brad Ott liked
Martin.au
(@martin_au)
50+ posts Member

Use one regularly. Tilt is good. Imagery is useful. What sort of input are you after.

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Posted : May 18, 2022 12:23 am
Shelby H. Griggs PLS
(@shelby-h-griggs-pls)
500+ posts Member

Gene, I have one with about a year of experience but haven't used the imaging too much, only to get coordinates on some aerial control that was in traffic.

When I first got it, I surveyed my sprinkler heads and then got measurements both tilted and then with the camera, all agreed pretty well, but tilt adds some error and camera some more error. I would say discrete points with the camera are about 0.1 foot accuracy. I didn't do any mapping with it as I don't have that option in Infinity.

SHG

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Posted : May 19, 2022 8:53 pm

lukenz
(@lukenz)
200+ posts Member

@martin_au

What is the real world impact of tilt on point precision vs pole (known runout <3mm and 8' bubble adjusted correctly) and bipod for a 30 epoch shot?

I.e. is tilt any good for control or just a stakeout productivity booster.

Is the imaging option worth the hardware upgrade cost and having to buy Infinity software?

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Posted : May 19, 2022 11:30 pm
Martin.au
(@martin_au)
50+ posts Member

@lukenz 

I am pretty sure tilt is accounted for in the instrument's error estimation, so can see it's impact in the 2D/3D CQ. The specs sheet gives it at "Additional Hz uncertainty typically less than 8 mm + 0.4 mm/° tilt down to 30° tilt".

In my experience, it works well. Personally I wouldn't setout control with a significant tilt, but I've no concerns with leaving it on for normal control shots. It's easy to turn on and off though, so you could easily disable it (and it may well disable itself, as it needs regular movement for the IMU to remain active) if doing 30 second bipod shots.

I can't really say if imaging is worth it to you without knowing your use case. In my case, I do a lot of asset and infrastructure work and do a lot of reality capture, so the ability to generate a quick point cloud, or pick up a few points tucked in under obstructions makes imaging well worth it. 

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Posted : May 20, 2022 12:55 am
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