[Qgis-user] Reprojection issue QGis 1.8

[Alex Mandel]

It has since 1.7
http://linfiniti.com/2011/03/on-the-fly-raster-reprojection-comes-to-qgis/

However stuff next to the edge of Lat/Lon coordinate systems is
perpetually an issue in a lot of GIS software. Sometimes I cut off my
stuff to only go to -179, sometimes I slice my stuff at the boundary
into separate images. There are all sorts of possible workarounds.
Generally I find actual reprojection is better than on-the-fly.

I'm wondering if the data in question here has an incorrect projection
definition or just needs a little shaved off the edge to behave right.

Are you running in Debug mode by any chance? (Outputs more information
on crashes) Willing to try it on the soon to be released version?

Thanks,
Alex


On 08/31/2013 05:41 PM, Matt Boyd wrote:
> Not really a solution, but, I didn't think that on the fly reprojection of
> rasters was supported by qgis. I'd be really happy to be corrected though.
> 
> Matt
> On Aug 31, 2013 11:47 PM, "Lester Anderson" <arctica1963 at gmail.com> wrote:
> 
>> Hello,
>>
>> I have a raster file (GeoTIFF and netCDF grid) of the Tonga region, so has
>> the longitude/latitude limits like:
>> -180 to -170; -26 to -12
>>
>> I used GMT to reproject the original Geographic grid from WGS84 to UTM
>> Zone 1S (WGS84), and created a GeoTIFF of the data. Both files will load
>> into a new project file no problem.
>>
>> However, if the project CRS is changed to say Geographic again (WGS84),
>> QGIS will crash  with the following error message:
>>
>>
>>
>> The whole thing just hangs and the only way to quit, is to kill it via the
>> Task Manager.
>>
>> If on-the-fly transform is set, then as long as the program knows what
>> projection each layer is, be it vector or raster, then it should be able to
>> transform it. When loading the raster in I ensured it had the correct
>> spatial attribution, so that is not the problem.
>>
>> The same error occurs if I load the same raster (or grid) into a project
>> in Geographic coordinates. Another GeoTIFF with the same projection (and
>> from the same UTMzone) loads fine.
>>
>> Is there an issue transforming data close to 180 degrees?
>>
>> Any ideas?
>>
>> Cheers
>> Lester
>>
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>>
> 
> 
> 
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