[GPlates-discuss] How to check the min and max velocities in GPlates?

[John Cannon]

Hi Nan,

> After I open the Kinematics tool (attached snapshot), I clicked the "velocity magnitude" and did get any response.

You also need to select a feature with the Choose Feature tool and then click 'Use focused feature' in the Kinematics Tool dialog.

But that gives you the velocities of the selected feature using its plate ID to calculate velocity (actually the velocities of the first point in the selected feature I believe). Whereas it looks like you want the traditional velocities of the plates that the static points reside in - which it doesn't calculate. Sorry, that all sounds confusing I'm sure.

In any case I think you might want the suggestions made by others on this list which essentially boils down to exporting the velocities from GPlates and processing them outside of GPlates.

Very soon we will release a GPlates Python library (pygplates) for those familiar with Python programming. The first release of pygplates unfortunately will not calculate the traditional surface velocities (inside dynamic plate boundaries), but the second release will. So, at least for the second release, there will also be the option (in addition to what the others have already suggested) to use Python to calculate the velocities (using pygplates library) and then post-process them (eg, calculate min/max).

Regards,
John

________________________________________
From: gplates-discuss-bounces at mailman.sydney.edu.au [gplates-discuss-bounces at mailman.sydney.edu.au] on behalf of Nan Zhang [nan.zhang at curtin.edu.au]
Sent: Thursday, 28 January 2016 2:21 PM
To: GPlates general discussion mailing list
Subject: Re: [GPlates-discuss] How to check the min and max velocities in GPlates?

Hi Christian,

After I open the Kinematics tool (attached snapshot), I clicked the "velocity magnitude" and did get any response.

When you mentioned "chose GMT (*.xy) as output and then batch process the output files with GMT's "gmt gmtinfo" (formerly minmax).", what is the exact command line for "batch the output files with gmtinfo", given my file name velocity_200Ma.xy?

I am trying to find the max velocity magnitude for different time frames, because when I put Seton's model to the velocity .gpml file for ASPECT, ASPECT returns me the max velocity at 200Ma is 28 m/yr?

Bests,
Nan



-----Original Message-----
From: gplates-discuss-bounces at mailman.sydney.edu.au [mailto:gplates-discuss-bounces at mailman.sydney.edu.au] On Behalf Of Christian.Heine at shell.com
Sent: Wednesday, 27 January 2016 10:54 PM
To: gplates-discuss at mailman.sydney.edu.au
Subject: Re: [GPlates-discuss] How to check the min and max velocities in GPlates?

Nan,

in GPlates: Go to Utilities -> Kinematics tool (or CTRL+k). This is the only place in the GUI where you can directly look at/query velocity information. However, that tool only allows you to use a single feature. If you want to do this for more features and in a more extensive way, you'd have to use the data mining capabilities and Python to code up workflows yourself (or even extend this using the Qt interface to build a GUI widget).

The way Bruce and I suggested earlier will allow you to do a batch analysis of velocity data outside of GPlates. I'd say this is probably the fastest and easiest option to get this done. In case that doesn't answer your questions you maybe have to explain in more detail of what you are trying to achieve.

Christian (not Christina ;-)



> -----Original Message-----
> From: gplates-discuss-bounces at mailman.sydney.edu.au [mailto:gplates-
> discuss-bounces at mailman.sydney.edu.au] On Behalf Of Nan Zhang
> Sent: Wednesday, 27 January 2016 2:50 PM
> To: GPlates general discussion mailing list
> Subject: Re: [GPlates-discuss] How to check the min and max velocities
> in GPlates?
>
> Hi Sabin, I read through your paper. It is a good paper, while it does
> address my issue. My question is how to find a tool in GPlates
> interface, to do a statistics for the loaded velocity field (the max,
> min, and mean velocity magnitude). Besides Christina's suggestion
> early on, is there a direct tool in GPlates?
>
>
>
>
>
> ________________________________
>
> From: gplates-discuss-bounces at mailman.sydney.edu.au <gplates-discuss-
> bounces at mailman.sydney.edu.au> on behalf of Sabin Zahirovic
> <sabin.zahirovic at sydney.edu.au>
> Sent: Wednesday, 27 January 2016 4:28 PM
> To: GPlates general discussion mailing list
> Subject: Re: [GPlates-discuss] How to check the min and max velocities
> in GPlates?
>
> Hi Nan,
>
> Please check this paper that talks about all of these things:
> http://www.earthbyte.org/tectonic-speed-limits-from-plate-kinematic-
> reconstructions/
>  <http://www.earthbyte.org/tectonic-speed-limits-from-plate-kinematic-
> reconstructions>
> Tectonic speed limits from plate kinematic reconstructions ...
> <http://www.earthbyte.org/tectonic-speed-limits-from-plate-kinematic-
> reconstructions>
> www.earthbyte.org
> Citation Zahirovic, S., Müller, R. D., Seton, M., & Flament, N. (2015).
> Tectonic speed limits from plate kinematic reconstructions. Earth and
> Planetary Science ...
>
> http://www.sciencedirect.com/science/article/pii/S0012821X15001235
>
> Hope that helps!
>
> 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 | W
> http://www.earthbyte.org <http://www.earthbyte.org/>  | R
> http://www.researchgate.net/profile/Sabin_Zahirovic
> <http://www.researchgate.net/profile/Sabin_Zahirovic>
> F https://www.facebook.com/earthbyte | T
> https://twitter.com/EarthByteGroup
>
> CRICOS 00026A
> This email plus any attachments to it are confidential. Any
> unauthorised use is strictly prohibited. If you receive this email in
> error, please delete it and any attachments.
>
> From: <gplates-discuss-bounces at mailman.sydney.edu.au> on behalf of Nan
> Zhang <nan.zhang at curtin.edu.au>
> Reply-To: GPlates general discussion mailing list <gplates-
> discuss at mailman.sydney.edu.au>
> Date: Wednesday, 27 January 2016 at 7:13 PM
> To: "gplates-discuss at mailman.sydney.edu.au" <gplates-
> discuss at mailman.sydney.edu.au>
> Subject: [GPlates-discuss] How to check the min and max velocities in
> GPlates?
>
>
>
> Hi all,
>
>
>
> I loaded Seton et al., 2012 data to generate some plate velocity files
> from 200Ma to the present day. One thing I want to check is the
> minimum and maximum velocity magnitudes. Who can give me some instruction?
>
>
>
> Bests,
>
> Nan

_______________________________________________
GPlates-discuss mailing list
GPlates-discuss at mailman.sydney.edu.au
http://mailman.sydney.edu.au/mailman/listinfo/gplates-discuss