[Qgis-user] Issue with "Mesh Calculator" with a GRIB file

[Eric Compas]

Vincent,

Thanks! I updated to 3.16 and the expression worked just fine (once I
figured out the changes to the mesh interface).

Eric

On Tue, Feb 9, 2021 at 9:37 PM Vincent Cloarec <vcloarec at gmail.com> wrote:

> Hi,
> Which QGIS version?
>
> It seems 3.10.
> Can you try with 3.16?
>
> Regards.
>
> Vincent
>
> Le mar. 9 févr. 2021 à 22:55, Eric Compas <ericcompas at gmail.com> a écrit :
>
>> All,
>>
>> I'm experimenting with the mesh viewing and analysis tools
>> in QGIS (3.12.3) using both the Crayfish and QGribDownloader plugins. All's
>> going very well, and for the most part, the tools are relatively easy to
>> use.
>>
>> While I've gotten several "Mesh calculator" expressions to work correctly
>> with a GRIB file (downloaded using the QGribDownloader plugin), I'm running
>> into an error with any expression using precipitation group, e.g.:
>>
>> ("Temperature [C]" > 10) and ("03 hr Total precipitation [kg/(m^2)]" < 2)
>>
>>
>> This expression yields an error "Mesh calculator: Invalid or incompatible
>> datasets used." I've tried several permutations and start/end ranges. All
>> without luck.
>>
>> Investigating further, it seems like the number of time "slices" in the
>> precipitation group isn't the same as in the temperature group and may not
>> be handled correctly in QGIS (??). In the temperature group layer
>> properties, the time slider and metadata times are always the same
>> (synchronized).  For the precipitation group, the time slider and metadata
>> in the layer properties aren't in sync:
>>
>> [image: 2021-02-06_10-34-02b.gif]
>> I suspect that the precipitation group has fewer time "slices" that may
>> not be handled correctly and hence the error in the "Mesh Calculator" tool.
>>
>> Is this a user error or some issue with how the mesh tools handle groups
>> with differing number of time "slices?"
>>
>> I'd appreciate any help.
>>
>> Thanks,
>>
>> Eric
>>
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