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

[Peter Aldhous]

Thanks! That did the trick

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 7/1/14, 11:23 AM, Larry Shaffer wrote:
> Hi Peter,
>
> On Sun, Jun 29, 2014 at 9:35 AM, Peter Aldhous <peter at peteraldhous.com
> <mailto:peter at peteraldhous.com>> wrote:
>
>     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!
>
>
> Try turning off 'Simplify geometry' for the layer (in layer
> properties) [0]. For new projects, not existing ones, the default
> behavior in QGIS 2.4 can now be controlled by a checkbox in Options ->
> Rendering (I think it's the Rendering tab, not at a computer right
> now). Then, you can selectively turn it on for layers where
> simplification would help speed up rendering.
>
> [0] http://gis.stackexchange.com/a/100333/6725
>
> Regards,
>
> Larry Shaffer
> Dakota Cartography
> Black Hills, South Dakota
>
>  
>
>
>     Peter Aldhous, PhD
>     Science journalist
>     Contributor, MATTER <https://www.medium.com/matter>
>     phone: 415 800 3471 <tel:415%20800%203471>
>     cell: 415 503 7323 <tel:415%20503%207323>
>     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 180º 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 <http://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 <tel:415%20800%203471>
>>>     cell: 415 503 7323 <tel:415%20503%207323>
>>>     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 <tel:415%20800%203471>
>>>>     cell: 415 503 7323 <tel:415%20503%207323>
>>>>     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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>>>
>>>
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>>>
>>>
>>
>>
>>     -- 
>>     Micha Silver
>>     GIS Consulting
>>     052-3665918
>>     http://www.surfaces.co.il
>
>
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