Align Field Scans and GPS data - Riegl - JAVAD

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fabiano_2002
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Align Field Scans and GPS data - Riegl - JAVAD

Post by fabiano_2002 »

Evening,

Anyone ever tried connecting a JAVAD system to a Riegl and collecting the gps point with it's orientation for the laser scanned area?

I believe we are missing something, not sure what that is. On the attached pictures we can see that the center of both points are converging, however, orietation and pitch are way off.

If anyone would have an input, please advise.

Cheers.
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by christopherbyrne18 »

Hi,

I have been using the new integrated GPS setup with our VZ1000's for a while now & it works great. It too uses a GPS & compass to orientate the scans. The scans in your images seem sufficiently orientated to run through the Multi Station Adjustment to improve the registration. I don't think you will get a fine alignment with just the compass, it will have to be adjusted in the MSA to get a usable final dataset. This is the approach Riegl take with the automated MSA in RiMINING & RiSOLVE

Cheers,

Chris
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by mariusP »

Hi,

I work with a RIEGL scanner in this principle. I put GPS on top of scanner for fixed position.

Then i am doing Multi Station Adjustment I lock all fixed positions settings ( X Y Z) and unlock orientation (Roll Pitch and Yaw) look at attached picture below.

Everything works perfect :ugeek:
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by joe.3dlm »

I agree with the above posts - the scanner's compass and inclination sensor are accurate enough to give a coarse registration, for the Multi Station Adjustment to improve.

If the GNSS receiver is outputting the estimated position error for the scanner to log, then the MSA can also use this. In this case, you would not lock the XYZ, but instead turn on the "Use measured scan positions" option:
MSA_use_measured_scan_positions[1].png
This will allow the scan position to move by up to the value of the GNSS position error - which can give a better registration if you have one or two positions with poor positional accuracy.

Note that you're best to be using the latest version of RiSCAN (1.8.0) as earlier versions had a bug in this feature.

Cheers,
Joe
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by fabiano_2002 »

Thank you for the reply gents.
I believe I wasn't clear on my post. The scanner it's not connected to the GPS system. For some reason the scanner will not comunicate with the GPS. We are locating the GPS points separate from the scanner operations and then importing them into RISCAN separately. Are we missing a firmware from Riegl? I did some research and it seems like you need a specific firmware to comunicate with the GPS. Would that make a diference?
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by mariusP »

My GPS is also not connected to scanner. I import GPS points as GCP and doing backsighting orientation for each scan postion.
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by joe.3dlm »

Fabiano,

Yes, you need to have a firmware license switched on in order to let an external GNSS receiver communicate with the scanner. This licence is standard on all VZ scaners now, but it wasn't always. You can check whether you have the licence switched on by going to SETTINGS > SYSTEM > LICENCES and look for "GPSONTOP"

Does it say deactivated or activated?

Joe
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by fabiano_2002 »

Joe,

The settings are activated, they are as follows:

Scansync : deactivated
REFLSERACH: deactivated
GPSONTOP: Activated

Do I have to configure de NMEA for the JAVAD? IF so, would you have any idea which one to use?

Regards.

Fabiano
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by joe.3dlm »

Yes, the JAVAD would need to output the correct NMEA strings. Usually the GNSS receiver is mounted on top of the scanner, connected to the scanner via a short (~30cm) grey cable. The standard cable has a LEMO plug at the scanner end, and an RS232 plug and BNC connector at the GNSS end. The cable can also be plugged into the "Trig" socket on the bottom part of the scanner.

So, in this scenario the JAVAD would need to be configured to output the strings:
- GGA, once per second. This might be called GPGGA
- ZDA, once per second, if time synchronisation is required
- GSA and GST - optional, but allow full functionality (e.g. position accuracy is within accepted tolerance. etc)

You must change the GPS settings on the scanner to tell it where to get the NMEA strings from. Go to SETTINGS > PERIPHERALS > GPS

On page 1, change the "GPS Mode" to either "EXT. GPS TOP" or "EXT. GPS RS232" depending on where you have plugged in the cable
On page 3, set the "Datagram" to NMEA_0183, and the baudrate etc. to match the JAVAD's settings
On page 4, set the "Mounting" to either "MountExtGNSS_noCam" or "MountExtGNSS_withCam", depending on how you have the receiver mounted. If you have the camera mounted, and the "short" GNSS adapter, use the ".._withCam" option. If you don't have the camera mounted, use the longer adapter and the "..._noCam" option.

This will set the correct vertical offset to the GNSS phase centre.

Let me know how you get on!

Joe
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Re: Align Field Scans and GPS data - Riegl - JAVAD

Post by fabiano_2002 »

Thank you Joe,

We'll give it a shot on those settings. I really appreciate your time. I owe you a beer, in Vegas, at the next Hexagon.

Regards,

Fabiano.
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