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Author Topic: Orientation in model with arbitrary coordinate system  (Read 4083 times)

Jobbo90

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Orientation in model with arbitrary coordinate system
« on: January 09, 2017, 12:49:21 PM »
Hi all,

Somewhere in my workflow i'm causing my 3D model to be inverted. I have a model with 400 photo's and 7 groundcontrol points measured in a arbitrary coordinate system with a Total Station (need high accuracy(<5mm) points!). I worked with Agisoft before, but this is the first time I work in an arbitrary coordinate system instead of world coordinate system
X range: 29.7664 - 70.0173 meter
Y range: 15.7528 - 47.3623 meter
Z range: 18.912 - 64.4892 meter

I need a DEM and orthophoto that are overlying each other to calculate volume of a part of the model (in ArcGIS for example). After alligning the photo's I placed the markers in the photo's and model and calculated the dense cloud and mesh/texture. I think the problem is related to the moment in my workflow where I calculate camera locations based on the coordinates? My cameras are unchecked and my markers are checked when I calculate the dense cloud, i'm not sure if this is correct.

Hopefully somebody is able to shed some light on my workflow or has some examples that also work with arbitrary coordinate systems.

Alexey Pasumansky

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Re: Orientation in model with arbitrary coordinate system
« Reply #1 on: January 09, 2017, 02:19:27 PM »
Hello Jobbo90,

Do you mean that the model is upside down? Maybe you need to re-load the coordinates and swap X and Y columns?
Best regards,
Alexey Pasumansky,
Agisoft LLC

Jobbo90

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Re: Orientation in model with arbitrary coordinate system
« Reply #2 on: January 09, 2017, 02:26:07 PM »
Hello Alexey,

Thanks for your quick repsonse.

It doesn't look like it is just upside down, it looks like the whole model is mirrored after I try to build texture and a DEM.
I could retry alligning the photo's with X and Y swapped but since it is an arbitrary system this shouldn't change the relative distances and altitude difference between the markers right?

Regards
Job

Alexey Pasumansky

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Re: Orientation in model with arbitrary coordinate system
« Reply #3 on: January 09, 2017, 03:07:25 PM »
Hello Job,

Z axis should be pointing from the ground level to the cameras (if it is aerial survey project).

The relative distances will remain the same only if the surface is flat, otherwise the elevation difference should be also taken into consideration.
Best regards,
Alexey Pasumansky,
Agisoft LLC

Jobbo90

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Re: Orientation in model with arbitrary coordinate system
« Reply #4 on: January 09, 2017, 05:46:00 PM »
My project is not aerial but I have taken the pictures with a hand held camera aimed towards the ground, so they are kind of taken from above. So now my Z-axis is not pointing in the direction i'm expecting, do you have any suggestions where the problem could be?

Thank you so much for your help!

Alexey Pasumansky

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Re: Orientation in model with arbitrary coordinate system
« Reply #5 on: January 09, 2017, 09:15:16 PM »
Hello Job,

So anyway, Z should be pointing from the ground to the air (not beneath the earth or in any other direction). And have you tried to swap X and Y columns already? Maybe you can send the PSZ file with only sparse cloud and markers to support@agisoft.com? Or a report generated from the project and screenshot of the source values in the Reference pane along with the model overview?
Best regards,
Alexey Pasumansky,
Agisoft LLC

Jobbo90

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Re: Orientation in model with arbitrary coordinate system
« Reply #6 on: January 10, 2017, 11:19:12 AM »
Thank you for the help, I just send an email with the relevant information!
I tried different settings you proposed, so some of the images are from a different working file, all with the same problem though.

Regards
Job

Alexey Pasumansky

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Re: Orientation in model with arbitrary coordinate system
« Reply #7 on: January 10, 2017, 11:29:58 AM »
Hello Job,

It the project that you have sent to us you need to press Update button on the reference pane, it will allow to apply the coordinates of the markers (I assume that you have swapped the columns already).
Best regards,
Alexey Pasumansky,
Agisoft LLC

Jobbo90

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Re: Orientation in model with arbitrary coordinate system
« Reply #8 on: January 10, 2017, 11:56:10 AM »
Thank you so much, I wasn't aware that in an arbitrary coordinate system swapping X and Y coordinates makes the difference. Together with pressing update on the right time in the workflow solved it for me, thank you!