Target based UAV to Scans registration

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IngSayyad
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Target based UAV to Scans registration

Post by IngSayyad » Tue Jan 06, 2015 9:57 am

We have scanned as well as imaged an object. I want to register scan and image data together.
At the moment we are using just natural features as tie points between two data sets.
But for higher accuracy, I'm planning to use targets. What sort of targets should I take. Also
shape, size etc.???
Flying height: 20-30 m.
Any suggestion??


Note: I intentionally started this new topic to have valuable discussion on registration of UAV and scan.
Dr.-Ing. Shahzad Sayyad

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Re: Target based UAV to Scans registration

Post by Sharas » Tue Apr 07, 2015 4:59 am

I'm curious too

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Re: Target based UAV to Scans registration

Post by danielgadowski » Mon Apr 13, 2015 1:09 pm

I would suggest reading up on some aerial photogrammetry.
In general you could use whatever targets you want as long as you can find them in the photos.
That will depend on the camera, lens and height of flying.
I remember using white discs, simmilar to plastic plates and GPS'ing their middle. On dark surface they came out really well and were a good reference to find.
Good luck
Daniel

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Re: Target based UAV to Scans registration

Post by MarcinL » Mon Apr 13, 2015 11:55 pm

Do you want to register point cloud from terrestrial laser scanning with photos taken using UAV? If yes I think that the best idea is to use targets which allows you to rotate them and set out in vertical position for scanning and in horizontal for UAV. This method should give you the best results. Of course you can use additional seperate targets for improve relative registration. Dimensions of targets is depend of height of flight and image resolution, but i think that for this height which you mentioned, targets with 10cm diameter should be enough. I've used 20cm diamater for 100m flight altitude and results were very well.

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Re: Target based UAV to Scans registration

Post by max72 » Tue Apr 14, 2015 7:17 am

I used some checkerboards suggested here:
http://www.laserscanningforum.com/forum ... =43&t=5711

This suggested mat is quite good
https://www.livingfloor.com/bodenbelaeg ... ss/a-8428/

It works well with aerial photography and Laser scanner (and it's easy to tag with a GPS or a total station). I simply lay them on the floor.

Massimo
ing. Massimo De Marchi - +39 347 32 17 049 - www.studiodemarchi.net

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Re: Target based UAV to Scans registration

Post by tbwester » Tue Apr 14, 2015 3:49 pm

If your in a location with easily identifiable corners that you can pick in the scan data and imagery, you can just use those.

We have had great results doing just that.

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Re: Target based UAV to Scans registration

Post by jmiranda » Wed Apr 15, 2015 4:57 am

I did what Thad said in his post and below is the link of the resulting rendering video using Arena 4d. The software used to create the point cloud is Agisoft Photoscan.

https://www.youtube.com/watch?v=LJ9bfDEBNlM

I did used manned aircraft photography about 900 ft from the ground to generate the point cloud. Then identified good recognizable corners and edges from the photos and took a GPS shot for Ground Control triangulation. I then took a lot of check shots in the vicinity of the aerial coverage on hard surfaces (entrances, pavement, etc) to check for accuracy. My checks came about +/- 1 ft of my gps location. Not a survey quality point cloud, but in conjuction with terrestrial/ mobile lidar data it can be greatly used for renderings and visualization.

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Re: Target based UAV to Scans registration

Post by IngSayyad » Wed Apr 15, 2015 7:52 am

@jmiranda very nice work. Thanks for the link.
Dr.-Ing. Shahzad Sayyad

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Re: Target based UAV to Scans registration

Post by dtmcnamara » Wed Apr 15, 2015 12:59 pm

jmiranda wrote:I did what Thad said in his post and below is the link of the resulting rendering video using Arena 4d. The software used to create the point cloud is Agisoft Photoscan.

https://www.youtube.com/watch?v=LJ9bfDEBNlM

I did used manned aircraft photography about 900 ft from the ground to generate the point cloud. Then identified good recognizable corners and edges from the photos and took a GPS shot for Ground Control triangulation. I then took a lot of check shots in the vicinity of the aerial coverage on hard surfaces (entrances, pavement, etc) to check for accuracy. My checks came about +/- 1 ft of my gps location. Not a survey quality point cloud, but in conjuction with terrestrial/ mobile lidar data it can be greatly used for renderings and visualization.
Which software did you use to create the point cloud data from the photos and what camera were you using?

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Re: Target based UAV to Scans registration

Post by jmiranda » Wed Apr 15, 2015 8:57 pm

David, I don't have the camera information in hand, as I'm out of the office, but the software used was Agisoft Photoscan. In addition of the point cloud I was able to create a DEM, a kmz, a 3d pdf and the regular ortho-rectified .tiff. I'll get back to you as soon as I get the camera info.


Jon

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