[Qgis-user] how to properly reference longitude values in different datasets

[Saber Razmjooei]

Climate Data Operator (CDO):
https://code.mpimet.mpg.de/projects/cdo/

cdo sellonlatbox,-180,180,-90,90 input.grib output.grib

Regards
Saber

On Thu, 20 Dec 2018 at 13:00, Lee Eddington <lee.w.eddington at gmail.com>
wrote:

> Can you point me to the external tools?
>
> Thanks,
> Lee
>
>
> On Dec 20, 2018, at 12:46 AM, Saber Razmjooei <
> saber.razmjooei at lutraconsulting.co.uk> wrote:
>
> This is a known issue and can be fixed with some external tools.
> I have filed a bug:
> https://issues.qgis.org/issues/20853
> And hopefully get around to fix it in 3.6
>
> Regards
> Saber
>
> On Thu, 20 Dec 2018 at 01:44, Lee Eddington <lee.w.eddington at gmail.com>
> wrote:
>
>> I’m pretty new to QGIS and am trying to figure out how to modify
>> longitude values of layers.  I was able to add a raster layer in GRIB2
>> format (NCEP global meteorological data).  The longitude values range from
>> 0 to 360 degrees.  I’m able to view and do calculations on the data with no
>> problem.  I also added shaded relief and coastline data from Natural
>> Earth.  This data has longitude values from -180 to 180 degrees.  So from
>> -180 to 0 degrees I only see the Natural Earth data, from 0 to 180 degrees
>> I see both datasets and from 180 to 360 degrees I only see the GRIB2 data.
>> I want both datasets to be referenced the same with regards to longitude
>> (-180 to 180, 0 to 360 or whatever).  It seems like this should be a fairly
>> easy problem to fix by either adding 180 degrees to longitudes from the
>> Natural Earth data or subtracting 180 from the GRIB2 longitudes, but I
>> can’t figure out how to do it.
>>
>> I’m using QGIS version 3.4.1-Madeira.  The CRS I’m working in is what
>> QGIS put the GRIB2 data into when I added it:   * Generated CRS
>> (+proj=longlat +a=6371229 +b=6371229 +no_defs)
>>
>> Thanks,
>> Lee
>>
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>
>
>
> --
> Saber Razmjooei
> www.lutraconsulting.co.uk
> +44 (0)7568 129733
>
>
>

-- 
Saber Razmjooei
www.lutraconsulting.co.uk
+44 (0)7568 129733
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