[GPlates-discuss] Adjust time step used to calculate displayed velocity fields?

[John Cannon]

Hi Jonny,

I will look into adding a velocity delta-time parameter in the next GPlates release (currently it is hardwired to 1My).

In the meantime you can use pygplates ( http://www.gplates.org/news.html#pygplates_rev12 ) to do the calculations (with adjustable delta-time) - see:

http://www.gplates.org/docs/pygplates/sample-code/pygplates_calculate_velocities_by_plate_id.html

http://www.gplates.org/docs/pygplates/sample-code/pygplates_calculate_velocities_in_dynamic_plates.html

The first link shows how to calculate velocities of moving geometries (by their plate ID).

The second link is for velocities of dynamic (topological) plates at static point locations (deformation is not currently handled - that will come in a future pygplates release).

Regards,
John

________________________________
From: gplates-discuss-bounces at mailman.sydney.edu.au [gplates-discuss-bounces at mailman.sydney.edu.au] on behalf of jonny wu [jonnywu_rhul at yahoo.co.uk]
Sent: Friday, 18 March 2016 3:13 PM
To: Christian Heine; GPlates general discussion mailing list
Subject: Re: [GPlates-discuss] Adjust time step used to calculate displayed velocity fields?

Hi Christian,

thanks for the suggestion and your generous help.

I followed your suggestion and tested smaller increments including 0.01.  The animation is of course displayed in finer timesteps, but my abrupt plate motion change shown by the velocity field vectors is still interpolated over 1 Ma.

I will personally send you some example animations in a following email.

cheers
Jonny

==
Jonny Wu
Post-doctoral Research Fellow
Department of Geosciences
National Taiwan University, Taipei
http://suppelab.gl.ntu.edu.tw/jonny


On Thursday, 17 March 2016, 19:30, Christian Heine <chhei at mensa.uberspace.de> wrote:


Hi Jonny,

adjusting the time increment for your animation can be done through Reconstruciton -> Configure animation. Here you can then set the increment to 0.01 (or maybe even shorter) time increments.

Greetings,
Christian


On 17 Mar 2016, at 11:24 am, jonny wu <jonnywu_rhul at yahoo.co.uk<redir.aspx?REF=emroEsCAdY_vAqQrUCqijJlEtwjcV1T-RP-pLzt2S3hnJk_z407TCAFtYWlsdG86am9ubnl3dV9yaHVsQHlhaG9vLmNvLnVr>> wrote:

> Hi all
>
> I'd like to adjust the velocity time step that is used to calculate the displayed velocity fields in Gplates.  Does anyone know if this is possible?  It seems the velocity time step is set at 1 Ma, but I like to choose a shorter time increment.
>
> For example, I have modelled an abrupt plate motion change at 2 Ma.  If the plate velocity fields are shown at coarse 1 Ma increments, my abrupt plate motion change can appear in Gplates between the single 2 Ma to 1 Ma timestep without any problems.  However, if I view the plate model at finer 0.2 Ma increments, the abrupt plate motion change is smoothly interpolated between the 2 to 1 Ma timesteps.  I would like to see an abrupt change between 2.0 and 1.8 Ma, and constant plate motion directions after 1.8 Ma.
>
> Does anyone have experience with this?
>
> thanks in advance
> Jonny Wu
>
> ==
> Jonny Wu
> Post-doctoral Research Fellow
> Department of Geosciences
> National Taiwan University, Taipei
> http://suppelab.gl.ntu.edu.tw/jonny<redir.aspx?REF=VrrEdsq-VegZ7VEtkaKdyBqeVxVf-5Fxi6gIdWFSFV7Fh1Hz407TCAFodHRwOi8vc3VwcGVsYWIuZ2wubnR1LmVkdS50dy9qb25ueQ..>

> _______________________________________________
> GPlates-discuss mailing list
> GPlates-discuss at mailman.sydney.edu.au<redir.aspx?REF=jPWJh_3GZYIH7Sa_-O8HM2BmxT2fOP_zVgBniCVUbXLFh1Hz407TCAFtYWlsdG86R1BsYXRlcy1kaXNjdXNzQG1haWxtYW4uc3lkbmV5LmVkdS5hdQ..>
> http://mailman.sydney.edu.au/mailman/listinfo/gplates-discuss<redir.aspx?REF=VV0zhXNB7Nrfd5B8cjaPL0TF0eu64xTEh9EnEYl-WBzFh1Hz407TCAFodHRwOi8vbWFpbG1hbi5zeWRuZXkuZWR1LmF1L21haWxtYW4vbGlzdGluZm8vZ3BsYXRlcy1kaXNjdXNz>



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.sydney.edu.au/pipermail/gplates-discuss/attachments/20160318/64766479/attachment-0002.html>