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Author Topic: Placing markers on GCPs without coordinates to align?  (Read 2365 times)

jlschmugge

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Placing markers on GCPs without coordinates to align?
« on: March 17, 2017, 10:26:52 PM »
I am a student in the phase of learning to use Photoscan to create DEMs and orthoimages.

I'm using a Phantom 3 Adv. I have a question about placing markers in the scene.  I have GCPs with cut tennis balls, but I do not have GPS coordinates for these points.  When I place markers in the scene after camera alignment they do not always align with the tennis balls.  Any tutorial I've seen mentions putting in the coordinates of the GCPs, but I do not have those. If I move the markers to the correct spot in each image without coordinates, will this have any benefits to align the cameras more accurately?

Thanks,

Jacob

Alexey Pasumansky

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Re: Placing markers on GCPs without coordinates to align?
« Reply #1 on: March 19, 2017, 12:56:42 PM »
Hello Jacob,

You can manually adjust the projections of the markers (their positions on the individual images) and then run optimization procedure to improve the camera alignment results. It may be reasonable to use rolling shutter compensation for the DJI cameras in the Optimize Cameras dialog.
Best regards,
Alexey Pasumansky,
Agisoft LLC

spiegel

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Re: Placing markers on GCPs without coordinates to align?
« Reply #2 on: March 19, 2017, 01:53:23 PM »
Quote
It may be reasonable to use rolling shutter compensation for the DJI cameras in the Optimize Cameras dialog.

Where do I find the "Rolling shutter compensation"?
In the normal Optimize Camere dialog I cannot see it ?

Alexey Pasumansky

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Re: Placing markers on GCPs without coordinates to align?
« Reply #3 on: March 19, 2017, 01:56:16 PM »
Hello spiegel,

It has been implemented in the version 1.3:
http://www.agisoft.com/downloads/installer/
Best regards,
Alexey Pasumansky,
Agisoft LLC

spiegel

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Re: Placing markers on GCPs without coordinates to align?
« Reply #4 on: March 19, 2017, 06:02:33 PM »
Thx.
This could be a reason to change a running system....
I hope version 1.3 works stable.