Leica BLK2Go

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Re: Leica BLK2Go

Post by LeicaUK_RC »

Intro to BLK2GO


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Re: Leica BLK2Go

Post by LeicaUK_RC »

Intro into scanning with the BLK2GO


youtu.be/gp0aB7pDxVs
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Re: Leica BLK2Go

Post by LeicaUK_RC »

Intro into BLK2GO processing


youtu.be/9Pxt_DdVjAY
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Re: Leica BLK2Go

Post by Carbix »

but here is the trick... do the same walk twice... see what the drift is.
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Re: Leica BLK2Go

Post by dhirota »

Carbix wrote: Wed Jun 10, 2020 1:39 am but here is the trick... do the same walk twice... see what the drift is.
And what did you find?
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Re: Leica BLK2Go

Post by Carbix »

dhirota wrote: Wed Jun 10, 2020 1:56 am
Carbix wrote: Wed Jun 10, 2020 1:39 am but here is the trick... do the same walk twice... see what the drift is.
And what did you find?
This is an above ground parking garage. About 70M x 20. I did one loop in a circle up a level and back down to the starting point. I also did the same going down and repeated each 5x to get a base. Sometimes it was "close enough" other times it was a complete and utter miss. In the second image you can see that ceiling has 2 lines. The lower line is the floor from above. The high line is the lower ceiling. The first image shows the drift on a columns that was about 50m from the start.

I walked at a full saunter. I did everything to try and make the scans works.

You can also see how poorly the scans lined up to the images.
(
The images are UTTER CRAP. This is a Leica device but the images look like they came out of a BlackBerry Pearl in case your forgot what thats like https://youtu.be/69hVq4WDZYI?t=546

youtu.be/69hVq4WDZYI

I really wanted this thing to work. It was going to let my company really grow in fast simple job scans. But the consistency is just not there and thats said before even looking at the price...

Oh and it would take 2 hours to transfer a 5 min walk over its built in Type C connector (they used an old debugging prototypical to transfer). After dealing with that I'm happy to pay the $1000 for the RTC360 scanner. At least that transfers at 250mbps ish.
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Re: Leica BLK2Go

Post by landmeterbeuckx »

I've been diving into this slam based measuring and after looking at data from Blk2go, Zeb Horizon, Kaarta Stencil & Contour and Navvis VLX i came to the conclusion that the trust in good data is only in the VLX.

Walls not parallel, walls not level, strange behavior and lot's of noise everywhere,... I only would trust the VX system with control points. I'm intrigued by the technology but why would i start with measuring at an accuracy of 2cm when i tend to do stake-outs for buildings at 1-2mm.

I always get a good feeling when i know something is correct dimensionwise to deliver to a client without the headaches he could call because something went wrong without me even knowing.

For asset management and other inventory stuff these tools are great but when it comes to construction, i have a liaibility which i can control through other instruments but not with mobile scanning.

I will concentrate on the static side of things and will pass through on mobile (except maybe for the vlx if businesswise it would be a good investment, let's see some demos at intergeo). The specs on the other devices really have to become better in order to investigate further.

@dennishirota has tested a lot and i'm more compelling to listen to his findings then a rep of this gear. That's the strength of this forum, independent user input.

Just my 2 cents.
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Re: Leica BLK2Go

Post by vertigo1 »

That is some good info on the limitations Carbix. Do you think the problem is coming from transitioning levels with gradual slope? I imagine it would be troublesome since the algorithms in play are so dependent on edge detection that they would perform pretty poorly in an environment with a lot of gradual change, an Achilles Heel of this tech if you will.

Basically to me it seems that BLK2GO is going to struggle in any large open spaces in general, and especially when there is a lot of gradual change without any good corners nearby for it to use as reference and assist in "keeping things in perspective" algorithm wise.

I could definitely see the NavVis M6 performing well in this specific scenario as it is the situation they use for their promotional material, but the VLX I would have the same concerns with in an environment like this, although from the looks of the NavVis data, both from the M6 and VLX, they have a great algorithm so maybe it would do much better at handling this type of environment.
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Re: Leica BLK2Go

Post by rrice517 »

My firm recently acquired a BLK2GO. I've been testing it for nearly two months now, and have been unable to get any positive results with multi-level scans. Our office building is three stories, so we tried scanning two floors in one walk just to see how well it would work. This has been attempted several times, with little success.

I am able to scan just the stairwell and it comes out OK, but when I try to scan the office, then go downstairs and continue scanning, I have always had errors that make the scans unusable. My workaround was to scan each floor individually, including the stairs but without going up or down, then the stairwell by itself. This allowed me to align everything well enough to get reasonably accurate floor to floor heights.

I have yet to try it on any ramps, but we will be attempting to scan a parking garage next week - our first attempt to use the device professionally.

Unfortunately, this shortcoming is the least of our problems with this scanner. I think it was released well before it was ready. Most of our problems have been with the hardware, and their support team has been completely unresponsive. The only response we have received from several support requests have been from the sales staff. At this point, I have to imagine it's because they don't have any good answers.
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Re: Leica BLK2Go

Post by Carbix »

rrice517 wrote: Fri Jun 12, 2020 6:33 pm My firm recently acquired a BLK2GO. I've been testing it for nearly two months now, and have been unable to get any positive results with multi-level scans. Our office building is three stories, so we tried scanning two floors in one walk just to see how well it would work. This has been attempted several times, with little success.

I am able to scan just the stairwell and it comes out OK, but when I try to scan the office, then go downstairs and continue scanning, I have always had errors that make the scans unusable. My workaround was to scan each floor individually, including the stairs but without going up or down, then the stairwell by itself. This allowed me to align everything well enough to get reasonably accurate floor to floor heights.

I have yet to try it on any ramps, but we will be attempting to scan a parking garage next week - our first attempt to use the device professionally.

Unfortunately, this shortcoming is the least of our problems with this scanner. I think it was released well before it was ready. Most of our problems have been with the hardware, and their support team has been completely unresponsive. The only response we have received from several support requests have been from the sales staff. At this point, I have to imagine it's because they don't have any good answers.
$60k well spent? Do you trust Leica now?

I have high hopes for the VLX. I would like to see a demo of it in the real world and get some sample data. It looks to be the real deal and seeing that they came up with a way to have it place control is nice and smart.

The BLK band has become like a designer hand bag. Over priced and not very practical. Unless you want to look cool on Instagram.
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