[GPlates-discuss] For help: why is the displayed velocity field in GPlates (left picture) different from that I exported

[John Cannon]

Tao reports that the correct velocity field was exported using Sabin’s method.


Also the next release of GPlates (2.1) will export GMT velocities in the column order expected by GMT psxy (the ‘-Sv’ and ‘-SV’ options), which is:

lon lat direction speed

…in previous versions (GPlates 2.0 and prior) it is:

lon lat speed direction

… as Sabin noted, which required the user to swap columns 3 and 4 before passing to GMT psxy.

Regards,
John

From: GPlates-discuss [mailto:gplates-discuss-bounces at mailman.sydney.edu.au] On Behalf Of Sabin Zahirovic
Sent: Monday, 5 March 2018 3:37 PM
To: GPlates general discussion mailing list
Cc: Tao Zhu
Subject: Re: [GPlates-discuss] For help: why is the displayed velocity field in GPlates (left picture) different from that I exported

Hi Tao and John,

John, thanks for sending the pictures!

Tao, it looks like the arrows might be offset by about 90 degrees CCW in your panel, most obvious in the Australian region. There are different output options from GPlates, including:
-180/180 degrees anticlockwise from West
0 to 360 degrees clockwise from North (-SV option in gmt psxy)

I use the second option, and in GMT I use this line for plotting:
GMT4: psxy -R$frame -J$proj -Bg30 -W0.1p $input_velocity -SV0.005c/0.12c/0.05c -: -G0 -K -O -V >> $outfile
GMT5: gmt psxy -R$frame -J$proj -W0.3p $input_velocity -SV0.1c+e+g -: -G0 -K -O -V >> $outfile

Keep in mind that GMT expects a certain column order: lon, lat, direction, speed. In addition, there’s a difference between -SV and -Sv in psxy, in case you’re using GMT to plot…

Hope that helps!

Cheers,
Sabin

--
DR SABIN ZAHIROVIC | Postdoctoral Research Associate
School of Geosciences | Faculty of Science


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From: GPlates-discuss <gplates-discuss-bounces at mailman.sydney.edu.au<mailto:gplates-discuss-bounces at mailman.sydney.edu.au>> on behalf of John Cannon <john.cannon at sydney.edu.au<mailto:john.cannon at sydney.edu.au>>
Reply-To: GPlates general discussion mailing list <gplates-discuss at mailman.sydney.edu.au<mailto:gplates-discuss at mailman.sydney.edu.au>>
Date: Monday, 5 March 2018 at 3:28 pm
To: GPlates general discussion mailing list <gplates-discuss at mailman.sydney.edu.au<mailto:gplates-discuss at mailman.sydney.edu.au>>
Cc: Tao Zhu <zxl_tao at 126.com<mailto:zxl_tao at 126.com>>
Subject: Re: [GPlates-discuss] For help: why is the displayed velocity field in GPlates (left picture) different from that I exported

…attached are the missing pictures.


From: GPlates-discuss [mailto:gplates-discuss-bounces at mailman.sydney.edu.au] On Behalf Of Sabin Zahirovic
Sent: Monday, 5 March 2018 1:19 PM
To: GPlates general discussion mailing list
Subject: Re: [GPlates-discuss] For help: why is the displayed velocity field in GPlates (left picture) different from that I exported

Hi Tao,

I could not see the attachments. Were they stripped off by the mailing list?

Also, what export settings/option did you use for the velocity export?

Cheers,
Sabin

--
DR SABIN ZAHIROVIC | Postdoctoral Research Associate
School of Geosciences | Faculty of Science


THE UNIVERSITY OF SYDNEY
Rm 403, Madsen Building F09 | The University of Sydney | NSW | 2006
M +61 416 775 589 P +61 2 9351 3625
E sabin.zahirovic at sydney.edu.au<mailto:sabin.zahirovic at sydney.edu.au> | W https://protect-au.mimecast.com/s/BIe6CxnMRvtBo2gpU8JL9i?domain=earthbyte.org<https://protect-au.mimecast.com/s/VriVCyoNVrcJ5lQGFMRPJs?domain=earthbyte.org> | R http://www.researchgate.net/profile/Sabin_Zahirovic
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From: GPlates-discuss <gplates-discuss-bounces at mailman.sydney.edu.au<mailto:gplates-discuss-bounces at mailman.sydney.edu.au>> on behalf of Tao Zhu <zxl_tao at 126.com<mailto:zxl_tao at 126.com>>
Reply-To: GPlates general discussion mailing list <gplates-discuss at mailman.sydney.edu.au<mailto:gplates-discuss at mailman.sydney.edu.au>>
Date: Monday, 5 March 2018 at 12:58 pm
To: "gplates-discuss at mailman.sydney.edu.au<mailto:gplates-discuss at mailman.sydney.edu.au>" <gplates-discuss at mailman.sydney.edu.au<mailto:gplates-discuss at mailman.sydney.edu.au>>
Subject: [GPlates-discuss] For help: why is the displayed velocity field in GPlates (left picture) different from that I exported

Hi everyone,
My name is Tao Zhu, a researcher at the Institute of Geophysics, China Earthquake Administration. I used GPlates to export plate motion velocity at 0 Ma. I found that the displayed velocity field in GPlates (left picture) is very different from that I exported (right picture). Who can help me out?

Error! Filename not specified.Error! Filename not specified.
Thanks a lot in advance.
Tao Zhu




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