[gdal-dev] Handling NetCDF using UGRID Convention

[Even Rouault]

Hi,

no the GDAL raster driver has no support for the UGRIB convention. You 
could likely use the multidimensional API 
(https://gdal.org/user/multidim_raster_data_model.html) and tools to 
access such files at a lower level, but you'd probably be better uses 
MDAL which has apparently a UGRIB reader: 
https://www.mdal.xyz/drivers/ugrid.html and should be able to expose meshes.

Even

Le 08/09/2021 à 22:21, Laframboise,Felix (ECCC) a écrit :
>
> Hi,
>
> I am currently using GDAL 3.1.3 on a Ubuntu machine. I am trying to 
> work with NetCDF files using the UGRID convention (described here: 
> https://ugrid-conventions.github.io/ugrid-conventions/ 
> <https://ugrid-conventions.github.io/ugrid-conventions/>).
>
> I am having difficulty working with this kind of NetCDF file. Here is 
> the output of  `gdalinfo` against one subdataset of a NetCDF file 
> using the UGRID convention.
>
> `$ gdalinfo -mm -proj4 
> NETCDF:"PATH_TO_NETCDF/CMC_shop_slfeav200n_surface_sfc_0_2019080706_P040.nc":St_Lawrence_River_face_nodes
>
> Warning 1: No UNIDATA NC_GLOBAL:Conventions attribute
>
> Driver: netCDF/Network Common Data Format
>
> Files: PATH_TO_NETCDF/CMC_shop_slfeav200n_surface_sfc_0_2019080706_P040.nc
>
> Size is 3, 87396
>
> Metadata:
>
> St_Lawrence_River_face_nodes#cf_role=face_node_connectivity
>
> St_Lawrence_River_face_nodes#long_name=Maps every triangular face to 
> its three corner nodes.
>
> St_Lawrence_River_face_nodes#start_index=0
>
> Corner Coordinates:
>
> Upper Left  (    0.0,    0.0)
>
> Lower Left  (    0.0,87396.0)
>
> Upper Right (    3.0,    0.0)
>
> Lower Right (    3.0,87396.0)
>
> Center      (    1.5,43698.0)
>
> Band 1 Block=3x1 Type=Int32, ColorInterp=Undefined
>
>     Computed Min/Max=0.000,53331.000
>
>   NoData Value=-2147483647
>
>   Metadata:
>
>     cf_role=face_node_connectivity
>
>     long_name=Maps every triangular face to its three corner nodes.
>
> NETCDF_VARNAME=St_Lawrence_River_face_nodes
>
>     start_index=0
>
> `
>
> Following this output, I can confirm that the size and the extent 
> (Corner Coordinates) are not right for example.
>
> Is there anyone who has worked with NetCDF files using the UGRID 
> convention? Is GDAL capable of handling or manipulating this kind of 
> NetCDF file?
>
> Thanks a lot in advance for your answer(s)!
>
> Félix Laframboise
>
>
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