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

[Lee Eddington]

Coming back to this…I did some reading on MDAL and tried the instructions found at:

	https://www.lutraconsulting.co.uk/blog/2018/10/18/mdal/ <https://www.lutraconsulting.co.uk/blog/2018/10/18/mdal/>

trying to load the GFS dataset as a mesh instead of a raster, but I get the following error message:

	Tools::BufferedFileWriter::open: Cannot open file.: unspecified upstream_category error

I also tried loading the ECMWF_ERA-40_subset.nc dataset linked to the blog post and get an error message saying it is an invalid data source.

I’m using QGIS version 3.4.1-Madeira on MacOSX 10.14.2

Lee



> On Dec 21, 2018, at 2:46 PM, Lee Eddington <lee.w.eddington at gmail.com> wrote:
> 
> As a raster.
> 
> Sent from my iPhone
> 
> On Dec 21, 2018, at 12:09 AM, Saber Razmjooei <saber.razmjooei at lutraconsulting.co.uk <mailto:saber.razmjooei at lutraconsulting.co.uk>> wrote:
> 
>> Did you open your layer as Mesh layer or Raster?
>> 
>> Cheers
>> Saber
>> 
>> On Fri, 21 Dec 2018 at 05:59, Lee Eddington <lee.w.eddington at gmail.com <mailto:lee.w.eddington at gmail.com>> wrote:
>> That worked.
>> 
>> Thanks,
>> Lee
>> 
>> 
>>> On Dec 20, 2018, at 6:06 AM, Saber Razmjooei <saber.razmjooei at lutraconsulting.co.uk <mailto:saber.razmjooei at lutraconsulting.co.uk>> wrote:
>>> 
>>> Climate Data Operator (CDO):
>>> https://code.mpimet.mpg.de/projects/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 <mailto: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 <mailto: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 <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 <mailto: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 <http://www.lutraconsulting.co.uk/>
>>>> +44 (0)7568 129733
>>> 
>>> 
>>> 
>>> -- 
>>> Saber Razmjooei
>>> www.lutraconsulting.co.uk <http://www.lutraconsulting.co.uk/>
>>> +44 (0)7568 129733
>> 
>> 
>> 
>> -- 
>> Saber Razmjooei
>> www.lutraconsulting.co.uk <http://www.lutraconsulting.co.uk/>
>> +44 (0)7568 129733

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