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

[Vincent Cloarec]

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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