[GPlates-discuss] Problem linking raster to polygon file

[Sabin Zahirovic]

Hi Bruce,

Hope you’ve been well!

It could be something to do with the polygons, I’ve had similar issues in the past – although John has worked really hard on fixing those issues and has immensely improved how GPlates handles certain polygons.

As you mention, Repair Geometry in ArcGIS is very helpful as it deleted features with Null geometries, and also fixes self-intersecting polygons. If you have very detailed polygons, say that have points so close to each other that GPlates thinks the polygon is self-intersecting, then this might cause some issues, although John has definitely fixed many aspects of this. Make sure that your polygons don’t have duplicate Feature Ids. This happens when you save out polygons from GPlates, and then cut them into sub-components in ArcGIS, leading to each portion of the polygon having the same Feature ID.

Can you confirm that you have the latest version of GPlates (1.5) installed? Also, it might be best to isolate one polygon that triggers the problem, and you can send it to me offline, and I can have a look at it. If it’s to do with the raster, it might be to do with the resolution of the file. I attach an OLD troubleshooting file I wrote up, which was before many of the fixes that John implemented, but it could be worthwhile having a look at some of the issues (especially if your polygons are not WGS84 or might have geometries beyond the geographic range).

Cheers,
Sabin


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DR SABIN ZAHIROVIC | Postdoctoral Research Associate
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Zahirovic, S., Matthews, K.J., Flament, N., Müller, R.D., Hill, K.C., Seton, M. and Gurnis, M., (In Press), Tectonic evolution and deep mantle structure of the eastern Tethys since the latest Jurassic, Earth Science Reviews<http://www.sciencedirect.com/science/article/pii/S0012825216302872>, doi: 10.1016/j.earscirev.2016.09.005.

Zahirovic, S., N. Flament, R. D. Müller, M. Seton, and M. Gurnis (In Press), Large fluctuations of shallow seas in low-lying Southeast Asia driven by mantle flow, Geochemistry, Geophysics, Geosystems<https://www.researchgate.net/publication/306088667_Large_fluctuations_of_shallow_seas_in_low-lying_Southeast_Asia_driven_by_mantle_flow>, doi: 10.1002/2016GC006434.

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From: GPlates-discuss <gplates-discuss-bounces at mailman.sydney.edu.au> on behalf of "Eglington, Bruce" <bruce.eglington at usask.ca>
Reply-To: GPlates general discussion mailing list <gplates-discuss at mailman.sydney.edu.au>
Date: Tuesday, 18 October 2016 at 4:51 AM
To: "GPlates general discussion mailing list (gplates-discuss at mail.usyd.edu.au)" <gplates-discuss at mail.usyd.edu.au>
Subject: [GPlates-discuss] Problem linking raster to polygon file

Hi
  I have a raster image which I need to connect to a reconstructed polygon but every time I try, GPlates freezes. I can make the connection for the same raster with another, simpler raster so I presume that the issue has to do with the polygon shapefile. Further checks demonstrate that the issue only relates to my collection of polygons for Antarctica. Can anybody suggest what I should check for. I have performed a Repair Geometry and Check Geometry in ArcGIS with no issues noted.

Regards
  Bruce

Bruce Eglington (Ph.D.)
Murray Pyke Chair
Geological Sciences
University of Saskatchewan
114 Science Place
Saskatoon
SK
S7N 4K8
Canada

bruce.eglington at usask.ca<mailto:bruce.eglington at usask.ca>
+1-306-966-5732

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