[GPlates-discuss] Shapefile issues - high node density

[Lester Anderson]

Hi Sabin,

I did some further investigations after posting, and just isolated
some of the polygons that had an excessive number of nodes on edges,
connected a raster and it was fine with the reconstruction.I did the
test on a series of polygons including very small slivers and larger
elements, so size was not the problem.

I was using GPLates 1.5, on Windows 7 64-bit.

The original shapefile has in excess of 5000 polygons,but this is not
an issue and the reconstruction etc works as expected. The issue
arises when trying to connect a raster (eg gravity data) to the
polygon file. Can you think, off the topof your head, what scenario
could cause the application to crash connecting a shapefile feature?

What I need to do next is get version 2.0 installed and see how that behaves.

Cheers
Lester

On 20 July 2017 at 01:38, Sabin Zahirovic <sabin.zahirovic at sydney.edu.au> wrote:
> Hi Lester,
>
> Hmmm that’s interesting. When points are very dense and have very high resolution, GPlates might think that these points collapse onto one, and trigger a self-intersecting polygon scenario. Perhaps this is why it’s crashing. Are you using GPlates 2.0? What operating system are you using?
>
> If you’d like, you can (privately) send me an example problem polygon and I can check it on my system. John Cannon has been doing some fixes to how GPlates deals with polygons, and I have an internal build of GPlates that I could test it on.
>
> Cheers,
> Sabin
>
>
>
> On 20/7/17, 1:03 am, "gplates-discuss-bounces at mailman.sydney.edu.au on behalf of Lester Anderson" <gplates-discuss-bounces at mailman.sydney.edu.au on behalf of arctica1963 at gmail.com> wrote:
>
>     Hello,
>
>     Just a quick one. Is there a node limit in GPLates when it comes to
>     connecting a raster to a shapefile? Found that complex shapefiles,
>     with some polygons with very dense nodes will crash the program.
>
>     Lester
>
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