[Qgis-user] mdal / mesh simple formats

[Matt Boyd]

Thanks Richard,
that looks interesting. I can now get regular grid / square mesh to
display correctly but I'm working with tri-mesh and anything I try to
load using that ends up like this..Just a line of squares.
There's something obvious I'm missing in the format here.

On Fri, Aug 26, 2022 at 4:56 PM Richard Duivenvoorde
<rdmailings at duif.net> wrote:
>
> Hi Matt,
>
> I'm not a Mesh expert either, but I use (and create) netcdf using python using the
> https://github.com/Unidata/netcdf4-python module
>
> Netcdf is pretty good supported in QGIS in my experience
>
> Our data has also a time dimension so we use the CF convention [0] and fiddling around with the so called UGRID convention [1] But maybe that is both too much for a simple tin...
>
> I Googled:
> https://stackoverflow.com/questions/48864357/convert-hdf5-to-netcdf4-in-bash-r-python-or-ncl
> as being able to convert hdf5 to netcdf... didn't/couldn't try/test though..
>
> Regards,
>
> Richard Duivenvoorde
>
> [0] https://en.wikipedia.org/wiki/Climate_and_Forecast_Metadata_Conventions
> [1] http://ugrid-conventions.github.io/ugrid-conventions/#data-variables
>
> On 8/26/22 03:32, Matt Boyd via Qgis-user wrote:
> > Thanks, thats pretty helpful.
> > I'm running QGIS 3.26.2-Buenos Aires installed from osgeo.
> > under the xdmf directory there the xmf/hdf files look pretty similar
> > to what I'm using but they won't load. there's a partial duplicate of
> > the data in the hdf file in that directory as a 2dm file which does
> > work.
> > I'm still not sure if I'm supposed to be able to load the xmf/hdf
> > files directly using mdal? I can easily drop out my hdf5 data to the
> > 2dm format is this the proposed way to do it?
> >
> > Thanks again
> > Matt
> >
> > On Fri, Aug 26, 2022 at 4:09 AM Delaz J via Qgis-user
> > <qgis-user at lists.osgeo.org> wrote:
> >>
> >> Hi Matt,
> >>
> >> The mdal repo has a number of mesh data
> >> (https://github.com/lutraconsulting/MDAL/tree/master/tests/data) but
> >> whether these are simple meshes/formats or not is beyond my
> >> understanding of this data type.
> >>
> >> Hope that helps,
> >>
> >> Harrissou
> >>
> >> Le 25/08/2022 à 09:41, Matt Boyd via Qgis-user a écrit :
> >>
> >>> Hi QGIS people,
> >>> I asked something like this a couple of years ago, managed to find
> >>> some workarounds and now that I know a little more about what I'm
> >>> doing I could use a bit of help.
> >>> I've got some simple tin meshes that I'd like to drop into QGIS, they
> >>> get generated in a python modelling software I'm using.
> >>> The data all sits in a single hdf5 file, points with coordinates, the
> >>> cells which are just the indexes of 3 points, plus attributes for each
> >>> point. About the simplest mesh setup I can imagine.
> >>> I'm trying to find the simplest format that mdal supports with an
> >>> example dataset so I can make something similar. (ideally hdf5 so I
> >>> don't need to work out how to use anything new in python).
> >>>
> >>> Any tips?
> >>> Thanks
> >>> Matt
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