[gdal-dev] Understand Why a netCDF4 File Is Not Supported

[Scott Smith]

Hi All,

I am trying to work with some SMOS data, specifically the netCDF4 files
from https://smos-diss.eo.esa.int/oads/access/.

Running gdalinfo or gdal_translate using the Docker image
osgeo/gdal:ubuntu-full-latest on these netCDF4 files seems to fail with

ERROR 4: '<file>' not recognized as a supported file format.

Full command and output

docker run -v /local/directory/containing/file/:/mnt/data/
osgeo/gdal:ubuntu-full-latest gdalinfo --debug ON
/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc

GDAL_netCDF: driver detected file type=3, libnetcdf detected type=3
GDAL_netCDF: No UNIDATA NC_GLOBAL:Conventions attribute
GDAL_netCDF: var_count = 72
GDAL:
GDALOpen(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc,
this=0x55cdea7bac30) succeeds as netCDF.
GDAL:
GDALClose(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc,
this=0x55cdea7bac30)
GDAL:
GDALOpen(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc,
this=0x55cdea7bac30) succeeds as netCDF.
GDAL:
GDALClose(/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc,
this=0x55cdea7bac30)
ERROR 4:
`/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc'
not recognized as a supported file format.
gdalinfo failed - unable to open
'/mnt/data/SM_OPER_MIR_SMUDP2_20220101T001713_20220101T011034_700_001_1.nc'.

>From this I'm not really able to understand what is wrong with the file.

The file with which I am testing is available here:
https://drive.google.com/file/d/1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk/view?usp=sharing

I am trying to figure out what is "wrong" with these files which render
them unreadable by gdal. I have not managed to find much by Googling. I'm
happy to continue investigating if anyone is happy to provide any pointers
to where I should be looking.

Any advice, pointers or help would be greatly appreciated.

Many Thanks
Scott Smith
Open Cosmos

p.s. I'm not sure if this is relevant or helpful, but I have managed to
have some partial success with an older version of gdal and some "single
variable" files I created from the original. Included for information, the
gdal version is   GDAL 3.3.2, released 2021/09/01   and a file which worked
with gdalinfo is
https://drive.google.com/file/d/1r4R2gy0w2nyEv1fwmMNNR8CHhwjvayIk/view?usp=sharing
.

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