[QGIS-Developer] Problems opening .grib data in QGIS 3.4

[Saber Razmjooei]

Hi Tim/Peter,

I have updated the ticket. I think at the moment only grib/netcdf supported
in gdal can be read as mesh layer.

Here is an example I have prepared for mesh layer, feel free to use this
QGIS project:
https://www.dropbox.com/s/az6l00c67qq5pzl/mesh_layer_weather.zip?dl=0

There are some bugs (-180, 180 coverage, projection) with mesh, which we
will be working on.

Feel free to file bugs or feature requests. Will be keen to hear your
feedback.

Regards
Saber


On Thu, 8 Nov 2018 at 07:32, Peter Petrik <
peter.petrik at lutraconsulting.co.uk> wrote:

> Hi,
>
> create an issue https://github.com/lutraconsulting/MDAL/issues/43
>
> You can also try links in the blog post
> https://www.lutraconsulting.co.uk/blog/2018/10/18/mdal/
> e.g. Here
> <https://www.unidata.ucar.edu/software/netcdf/examples/ECMWF_ERA-40_subset.nc>
>
> Cheers,
> Peter
>
> On Thu, Nov 8, 2018 at 7:09 AM Saber Razmjooei <
> saber.razmjooei at lutraconsulting.co.uk> wrote:
>
>> Hi Tim,
>>
>> I tried your dataset and got the same error in QGIS. Then when I tried to
>> download the netcdf version (which sometimes works better with mesh in
>> QGIS):
>>
>> #!/usr/local/bin/python
>> import cdsapi
>> c = cdsapi.Client()
>> c.retrieve(
>>     "reanalysis-era5-complete",
>> {
>>     "class": "ea",
>>     "dataset": "era5",
>>     "date": "2018-08-01",
>>     "domain": "g",
>>     "expver": "1",
>>     "number": "0/1/2/3/4/5/6/7/8/9",
>>     "param": "238.140",
>>     "step": "0",
>>     "stream": "ewda",
>>     "time": "06:00:00/18:00:00",
>>     "type": "fc",
>>     "format": "netcdf",
>>     "target": "output.nc",
>> }, "global-waves-2018-08-01-0600-1800.nc")
>>
>>
>> I got he following error:
>> First GRIB is not on a regular lat/lon grid or on a regular Gaussian
>> grid. Exiting
>>
>> For your example, you can use probably one of these datasets (I have
>> tried aerosols and they seem to open fine in QGIS):
>> https://atmosphere.copernicus.eu/catalogue#/
>>
>> Let me know if you have any problems.
>>
>> Cheers
>> Saber
>>
>>
>> On Thu, 8 Nov 2018 at 05:06, Tim Sutton <tim at kartoza.com> wrote:
>>
>>> Hi All./ Martin
>>>
>>>
>>> I’m trying to get some mesh data for a presentation to a bunch of
>>> climate geeks later today. I tried grabbing a sample dataset from
>>> ECMWF/Copernicus like this:
>>>
>>> #!/usr/local/bin/python
>>> import cdsapi
>>> c = cdsapi.Client()
>>> c.retrieve(
>>>     "reanalysis-era5-complete",
>>> {
>>>     "class": "ea",
>>>     "dataset": "era5",
>>>     "date": "2018-08-01",
>>>     "domain": "g",
>>>     "expver": "1",
>>>     "number": "0/1/2/3/4/5/6/7/8/9",
>>>     "param": "238.140",
>>>     "step": "0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/17/18",
>>>     "stream": "ewda",
>>>     "time": "06:00:00/18:00:00",
>>>     "type": "fc",
>>>     "target": "output",
>>> }, "global-waves-2018-08-01-0600-1800.grib")
>>>
>>> ~
>>>
>>>
>>>
>>> When trying to add it as a mesh in Data Source Manager it gives a ‘file
>>> not supported’ error. So two questions:
>>>
>>> 1) anything obvious I am doing wrong?
>>> 2) where is the best place to get some demo .grib or NetCDF data that I
>>> can use to show off the cool new mesh stuff in 3.4 (with vector arrows etc).
>>>
>>> Regards
>>>
>>> Tim
>>>
>>> —
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> *Tim Sutton*
>>>
>>> *Co-founder:* Kartoza
>>> *Ex Project chair:* QGIS.org
>>>
>>> Visit http://kartoza.com to find out about open source:
>>>
>>> Desktop GIS programming services
>>> Geospatial web development
>>> GIS Training
>>> Consulting Services
>>>
>>> *Skype*: timlinux
>>> *IRC:* timlinux on #qgis at freenode.net
>>>
>>> _______________________________________________
>>> QGIS-Developer mailing list
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>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
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>>
>>
>>
>> --
>> Saber Razmjooei
>> www.lutraconsulting.co.uk
>> +44 (0)7568 129733
>> _______________________________________________
>> QGIS-Developer mailing list
>> QGIS-Developer at lists.osgeo.org
>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer
>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
>
>

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