[Qgis-user] Problems with re-projection in QGIS>2.2 on MacOS

[Peter Aldhous]

Yes, on my system the problem also resolves on zooming - although I'd 
only use Robinson for a global view.

However, I have no problem with Google Mercator.

Would really like to know how to fix this!

Peter Aldhous, PhD
Science journalist
Contributor, MATTER <https://www.medium.com/matter>
phone: 415 800 3471
cell: 415 503 7323
email: peter at peteraldhous.com <mailto:peter at peteraldhous.com>
web: www.peteraldhous.com <http://www.peteraldhous.com/>
twitter: @paldhous <https://twitter.com/paldhous>

On 6/29/14, 7:57 AM, Micha Silver wrote:
> I can verify this same behavior on Win7 with QGIS 2.4 64b. I think it 
> has to do with the shapes crossing the 180^(o) line. If you zoom in to 
> a smaller area that includes only countries in one hemisphere, the 
> borders look OK. Also, it's not only Robinson and Mollweide: any 
> global projection will show strange trapezoids (even "Google" mercator)
> I also see that if you use the *spatialite database file* from 
> naturalearthdata.org this problem disappears. You can switch to other 
> world projections with no problem.
>
> On 29/06/2014 16:59, Peter Aldhous wrote:
>> I don't think the image came through, but the problem is that every 
>> polygon ends up as a trapezoid, so I end up with a collection of 
>> overlapping trapezoids
>>
>> Peter Aldhous, PhD
>> Science journalist
>> Contributor, MATTER <https://www.medium.com/matter>
>> phone: 415 800 3471
>> cell: 415 503 7323
>> email: peter at peteraldhous.com <mailto:peter at peteraldhous.com>
>> web: www.peteraldhous.com <http://www.peteraldhous.com/>
>> twitter: @paldhous <https://twitter.com/paldhous>
>>
>> On 6/29/14, 6:54 AM, Peter Aldhous wrote:
>>> Hi all,
>>>
>>> I'm using the KyngChaos install of QGIS on the Mac (Mavericks and 
>>> Lion, on different machines), and I've been having problems with  
>>> projections including Robinson and Mollweide from QGIS 2.2 onwards.
>>>
>>> Everything was fine in QGIS 2.0, but in 2.2 and 2.4, re-projecting a 
>>> world Natural Earth shapefile to a Robinson projection, for example, 
>>> gives this:
>>>
>>>   Any idea what might be going on, and how to fix it?
>>>
>>> Thanks,
>>>
>>>
>>> -- 
>>> Peter Aldhous, PhD
>>> Science journalist
>>> Contributor, MATTER <https://www.medium.com/matter>
>>> phone: 415 800 3471
>>> cell: 415 503 7323
>>> email: peter at peteraldhous.com <mailto:peter at peteraldhous.com>
>>> web: www.peteraldhous.com <http://www.peteraldhous.com/>
>>> twitter: @paldhous <https://twitter.com/paldhous>
>>>
>>
>>
>>
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>
>
> -- 
> Micha Silver
> GIS Consulting
> 052-3665918
> http://www.surfaces.co.il

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