From l.suchoy17 at imperial.ac.uk Tue Mar 3 02:30:39 2020 From: l.suchoy17 at imperial.ac.uk (Suchoy, Lior) Date: Mon, 2 Mar 2020 15:30:39 +0000 Subject: [GPlates-discuss] Help extracting plate size and trench age from GPlates model Message-ID: Hello As part of a project on upper mantle drag I am trying to extract several properties of plates from the Muller et al 2019 model of plate reconstruction. I managed to extract velocities using the kinematic tool. The other two properties which I am looking for are plate sizes (probably as plolygon surface area) and age at the trench (for subducting plates). I would be grateful for anyone who can assist me or point me to a good resource to complete this task. Thank you, Lior Suchoy | Research Postgraduate for Geodynamics Earth Science and Engineering Dep., Imperial College London Royal School of Mines, 4th floor, Desk 493/11, London, SW7 2BP Email: L.suchoy17 at imperial.ac.uk Mobile: +44 (0)74 00617085 -------------- next part -------------- An HTML attachment was scrubbed... URL: From simon.williams at sydney.edu.au Tue Mar 3 23:02:08 2020 From: simon.williams at sydney.edu.au (Simon Williams) Date: Tue, 3 Mar 2020 12:02:08 +0000 Subject: [GPlates-discuss] Help extracting plate size and trench age from GPlates model In-Reply-To: References: Message-ID: <036D10B6-C004-441F-81D6-D40A0CC69790@sydney.edu.au> Hi Lior, If you are happy to go down the python-coding route, there are some python notebooks that go through how to extract the properties you want (using the pygplates module): For plate areas: https://protect-au.mimecast.com/s/DeStCq7BKYt88EKJ1uZsMb7?domain=github.com For age at trench https://protect-au.mimecast.com/s/NuTGCr8DLRt88kP4ruzayoz?domain=github.com You should be aware that: - for the age at trench, you?ll need to have seafloor age grids that is consistent with whatever reconstruction you use. - more generally, the Muller et al 2019 reconstruction is fairly unique in being a ?deforming? plate model, and pygplates does not (currently) properly support reconstructions with deforming regions. Many of the examples you?ll find online (including those linked above) will work with most other reconstructions that don?t include deforming regions (e.g. the reconstruction in the GPlates sample data), but not Muller et al 2019. If you are flexible with which global reconstruction to use, it would make things more straightforward to go with a ?rigid? topological model. If the use of Muller et al 2019 is non-negotiable, you?ll need to ignore the links above and find a different way that follows the same steps but without using pygplates, instead working on files that contain polygons and trench locations exported from the GPlates GUI. Regards, Simon On 3 Mar 2020, at 2:30 am, Suchoy, Lior > wrote: Hello As part of a project on upper mantle drag I am trying to extract several properties of plates from the Muller et al 2019 model of plate reconstruction. I managed to extract velocities using the kinematic tool. The other two properties which I am looking for are plate sizes (probably as plolygon surface area) and age at the trench (for subducting plates). I would be grateful for anyone who can assist me or point me to a good resource to complete this task. Thank you, Lior Suchoy | Research Postgraduate for Geodynamics Earth Science and Engineering Dep., Imperial College London Royal School of Mines, 4th floor, Desk 493/11, London, SW7 2BP Email: L.suchoy17 at imperial.ac.uk Mobile: +44 (0)74 00617085 _______________________________________________ GPlates-discuss mailing list GPlates-discuss at mailman.sydney.edu.au https://mailman.sydney.edu.au/mailman/listinfo/gplates-discuss -------------- next part -------------- An HTML attachment was scrubbed... URL: From john.cannon at sydney.edu.au Wed Mar 4 11:29:40 2020 From: john.cannon at sydney.edu.au (John Cannon) Date: Wed, 4 Mar 2020 00:29:40 +0000 Subject: [GPlates-discuss] See which features constitute a topology In-Reply-To: References: Message-ID: Hi Thomas, The quick answer is to turn on "View > Geometry Visibility > Show Topological Sections". There's a new setting "View > Geometry Visibility > Show Topological Sections" show/hide the dangling bits of topologies. This setting is turned off by default, so that users new to GPlates don't get confused by these dangling bits - because they're expecting a continuously closing boundary around each plate (without the intersecting bits). In other words, a new user can load up a rotation file and some dynamic polygon files, and only see the topologies (without the intersecting line geometries they were derived from). For advanced users, you will want to check that box so that topological sections are visible. Note that this setting is saved as part of a project, so if you receive a project from someone else that has this box checked then you won't need to check it after you load their project. Also you can have it always checked by default at GPlates startup by checking the "Show topological sections" box in the "Edit > Preferences > View" dialog. However note that if you subsequently load a project, or a session, it will override your default for as long as that project/session is loaded (eg, until you "clear session"). I should mention that it's also possible to simply make the green layers invisible (in the layers dialog) to hide the dangling bits, but that does not always work. For example, if you have a topological line (that is used as part of a topological plate boundary) then it will be in a purple layer (because it's 'topological'), and making that layer invisible (because you want to hide the topological line because it's a dangling bit) will also hide any plate boundary topologies that happen to be in the same layer/file. Also users new to GPlates are not always aware that they would need to hide layers like this. Hence the default of not showing these geometries by default (regardless of whether the layer is visible or not). Note that only those geometries that are actually used by topologies are hidden (by the "View > Geometry Visibility > Show Topological Sections" setting). So in your case some geometries are hidden and some are not. The ones that are not hidden are not being used by any loaded topologies (GPlates automatically scans all loaded topological rigid and deforming boundaries). This is why you could click on some but not others. And once you enable the setting you should be able to click on these features both normally and when using Topology Boundary Sections In the Edit Topology Sections tool. Since it's related to this discussion, there's a pyGPlates script to remove any features not directly or indirectly referenced by topological rigid and deforming boundaries. This can be used by those who provide topological data (we have started using it). It is a post-process to be used just before releasing a topological model. It essentially finds all features not referenced by topological rigid/deforming boundaries and removes them from the dataset, so that when users load the dataset the "View > Geometry Visibility > Show Topological Sections" setting works properly... https://protect-au.mimecast.com/s/9Qy7C4QZ1RFBJQYExTOcjtX?domain=github.com (use the "--help" option to see a description of the command-line arguments) Regards, John From: GPlates-discuss On Behalf Of Linden, T.J.M. van der (Thomas) Sent: Saturday, 29 February 2020 2:01 AM To: gplates-discuss at mailman.sydney.edu.au Subject: [GPlates-discuss] See which features constitute a topology Hi, I have been trying to find which features constitute topologies in a downloaded GPlates model (in this case Matthews et al. GPC 2016, available from https://protect-au.mimecast.com/s/kKm2C5QZ29FZ0Qg31cOABso?domain=doi.org). I would like to know which parts of the topology are subduction zone, mid ocean ridge or passive margin. So far my efforts were not successful. Methods tried: * Select the topology and delete it, this results in the deletion of all features constituting the topology. * Disabling or deleting the layer with topologies * Selecting the topology and look in Query feature What works for some features is to select the Topology and then click on individual features constituting the topology. However not all features react to clicking in this mode (for instance the subduction zone of the Andes does not). Also the list shown in Topology Boundary Sections, cannot be used to highlight individual features on the map. Does anyone know a solution? I can imagine writing a pyGPlates script to create a new file with only features, but would like to have a direct graphical method. I use GPlates 2.2.0 in Windows10. Cheers from Berlin, Thomas -------------- next part -------------- An HTML attachment was scrubbed... URL: From john.cannon at sydney.edu.au Wed Mar 4 14:05:28 2020 From: john.cannon at sydney.edu.au (John Cannon) Date: Wed, 4 Mar 2020 03:05:28 +0000 Subject: [GPlates-discuss] New GPlates Community Forum... Message-ID: Hi everyone, We are moving GPlates discussions to our new GPlates Community Forum ( https://protect-au.mimecast.com/s/8t9ACgZowLHAlx9xWtNG39n?domain=discourse.gplates.org ) set up by Michael Chin as a modern replacement for this mailing list. We've just sent invitations out to members of this list. If you haven't received an invitation please check your Junk Email folder (or spam filter), or just sign up at the above link. Note that if you've recently subscribed to this mailing list (in the last few months) you won't have received an invitation, but you can still sign up to the new forum at the above link. Please post any new GPlates-related questions on the new forum. We will soon be deleting this mailing list. However we will retain the list archives so that they show up in future google searches. See you on the new forum! Regards, John -------------- next part -------------- An HTML attachment was scrubbed... URL: From michael.chin at sydney.edu.au Thu Mar 5 11:10:21 2020 From: michael.chin at sydney.edu.au (Michael Chin) Date: Thu, 5 Mar 2020 00:10:21 +0000 Subject: [GPlates-discuss] New GPlates Community Forum... In-Reply-To: References: Message-ID: Hi everyone, The new online forum has a "Mailing list mode". If you prefer the old mailing list, you can go to "Preferences->Emails" to enable the "Mailing list mode". You can also change the frequency of email notifications there. ________________________________ From: GPlates-discuss on behalf of John Cannon Sent: Wednesday, 4 March 2020 2:05 PM To: GPlates general discussion mailing list Subject: [GPlates-discuss] New GPlates Community Forum... Hi everyone, We are moving GPlates discussions to our new GPlates Community Forum ( https://protect-au.mimecast.com/s/h6ATCYWL1viL3D5vkT0OiML?domain=discourse.gplates.org ) set up by Michael Chin as a modern replacement for this mailing list. We?ve just sent invitations out to members of this list. If you haven?t received an invitation please check your Junk Email folder (or spam filter), or just sign up at the above link. Note that if you?ve recently subscribed to this mailing list (in the last few months) you won?t have received an invitation, but you can still sign up to the new forum at the above link. Please post any new GPlates-related questions on the new forum. We will soon be deleting this mailing list. However we will retain the list archives so that they show up in future google searches. See you on the new forum! Regards, John -------------- next part -------------- An HTML attachment was scrubbed... URL: