[GPlates-discuss] Shapefile issues - high node density

[Lester Anderson]

Hi John, Sabin,

Just installed GPlates 2.0 and the problem is resolved! Seemed to be
happy cookie-cutting a 65Mb raster. Just seemed a little odd, because
I could connect the large raster to the default polygons that come
with GPlates 1.5

Cheers guys

Lester

On 20 July 2017 at 07:17, John Cannon <john.cannon at sydney.edu.au> wrote:
> Hi Lester,
>
> Definitely use GPlates 2.0 - there were many stability and speed improvements in regards to connecting polygons to rasters since GPlates 1.5.
>
> Regards,
> John
>
> ________________________________________
> From: gplates-discuss-bounces at mailman.sydney.edu.au [gplates-discuss-bounces at mailman.sydney.edu.au] on behalf of Lester Anderson [arctica1963 at gmail.com]
> Sent: Thursday, 20 July 2017 4:10 PM
> To: GPlates general discussion mailing list
> Subject: Re: [GPlates-discuss] Shapefile issues - high node density
>
> 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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